WO2015158294A1 - 前导符号的生成、接收方法和频域符号的生成方法及装置 - Google Patents
前导符号的生成、接收方法和频域符号的生成方法及装置 Download PDFInfo
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- WO2015158294A1 WO2015158294A1 PCT/CN2015/076813 CN2015076813W WO2015158294A1 WO 2015158294 A1 WO2015158294 A1 WO 2015158294A1 CN 2015076813 W CN2015076813 W CN 2015076813W WO 2015158294 A1 WO2015158294 A1 WO 2015158294A1
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- preamble symbol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26136—Pilot sequence conveying additional information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a method and a device for generating and receiving preamble symbols and a method for generating frequency domain symbols.
- the OFDM system in order for the receiving end of the OFDM system to correctly demodulate the data transmitted by the transmitting end, the OFDM system must implement accurate and reliable time synchronization between the transmitting end and the receiving end. At the same time, because the OFDM system is very sensitive to the carrier frequency offset, the receiving end of the OFDM system needs to provide an accurate and efficient carrier frequency estimation method to accurately estimate and correct the carrier frequency offset.
- an OFDM system is composed of physical frames, and each frame usually has a synchronization frame header, which is called a preamble symbol or a bootstrap, and implements time synchronization between the transmitting end and the receiving end.
- the preamble symbol is a sequence of symbols known to both the transmitting end and the receiving end of the OFDM system.
- the preamble symbol is used as the beginning of the physical frame and usually contains the P1 symbol.
- the use of the P1 symbol (preamble) or the bootstrap symbol includes:
- the problem solved by the present invention is that in the current DVB_T2 standard and other standards, the DVB_T2 time domain structure cannot be applied to coherent detection, and the preamble symbol fails in the DBPSK differential decoding under the complex frequency selective fading channel, and the receiving algorithm detects the probability of failure.
- the embodiments of the present invention provide a method for generating a preamble symbol, a receiving method, and a method for generating a frequency domain symbol and related devices.
- An embodiment of the present invention provides a method for generating a preamble symbol, including the steps of: generating a time domain symbol having the following three-segment structure based on a time domain body signal; and generating a preamble symbol based on the at least one time domain symbol,
- the preamble symbol comprises: a time domain symbol having a first three-segment structure; or a time domain symbol having a second three-segment structure; or a plurality of time domain symbols having a first three-segment structure arranged in no particular order And/or a free combination of a number of time domain symbols having a second three-segment structure, the first three-segment structure comprising: a time domain body signal, a prefix generated from a partial time domain body signal intercepted from the time domain body signal
- the second three-segment structure includes: a time domain body signal, a prefix generated according to a partial time domain body signal intercepted from the time domain body signal,
- the method further includes: the step of generating a prefix, a suffix or a super prefix, including: the prefix is directly intercepted from the back of the time domain body signal; the suffix Or the super prefix is obtained by modulating all or part of the partial time domain symbol corresponding to the prefix.
- the method further includes: the step of generating the prefix, the suffix or the super prefix, including: the signal intercepted from the back of the time domain body signal is followed.
- the first predetermined processing rule is processed to form a prefix, and the latter is intercepted from the time domain body signal
- the extracted signal is processed according to a second predetermined processing rule to form a suffix or a super prefix.
- the first predetermined processing rule includes: direct copying; or multiplication by an identical fixed coefficient or predetermined different coefficient
- the second predetermined processing rule includes: when the first predetermined The processing rule is a modulation process when the direct copy is performed; or when the first predetermined processing rule is multiplied by the same fixed coefficient or a predetermined different coefficient, the corresponding coefficient is multiplied by the corresponding coefficient.
- the length of the suffix or the super prefix does not exceed the length of the prefix.
- the method further includes: the step of generating the suffix or the super prefix includes: setting a frequency shift sequence; multiplying part or all of the partial time domain body signal by The frequency shift sequence is followed by a suffix or super prefix.
- the method further includes: wherein the frequency offset sequence of the frequency offset sequence is according to a frequency domain subcarrier spacing corresponding to the time domain body signal or according to a super prefix and a suffix The length is determined by the frequency shift sequence to arbitrarily select the epoch.
- the method for generating a preamble symbol there is further characterized in that, when a combination of a length of a cyclic prefix, a suffix or a length of a super prefix is determined, when a suffix or a super prefix is generated Transmitting signaling information or identifying emergency broadcasts by intercepting portions of the time domain body signals at different starting locations.
- the method further includes: wherein the current pilot symbol includes only one of the first three-segment structure and the second three-segment structure to identify the non- Emergency broadcasts use another to identify emergency broadcasts; or use different ordering between the first three-segment structure and the second three-segment structure to identify emergency broadcasts.
- the method for generating the preamble symbol there is further characterized in that, when the current pilot symbol includes at least two three-segment structures and there are different three-segment structures, the first three-segment structure The starting point of the selected suffix or super prefix corresponds to the first sampling point number of the time domain body signal, And selecting a suffix or a prefix of the super prefix in the second three-segment structure to satisfy a predetermined constraint relationship between the sequence numbers of the second sample points corresponding to the time domain body signal.
- the method further includes: the predetermined constraint relationship includes: setting a first sample point number to N1_1, and selecting a second sample point number to N1_2, a time domain body signal.
- the length is N A
- the length of the prefix is Len C
- the length of the suffix or super prefix is Len B
- N1_1+N1_2 2N A -(Len B +Len c ) is satisfied.
- the modulation method used when generating the suffix or the super prefix is a modulation frequency offset
- the first three-segment structure is neutralized.
- the frequency offset values in the second three-segment structure are opposite.
- the method further includes: the preamble symbol includes at least one time domain symbol, and the at least one time domain symbol includes: the first time domain symbol adopts the first type For the three-segment structure, the remaining time-domain symbols of the sub-secondary are respectively the second three-segment structure.
- the method further includes: wherein the length of the time domain body signal is 2048 sampling periods, the prefix length is 520 sampling periods, and the suffix or super prefix length is 504 sampling periods, for the first three-segment structure, the starting position of the suffix intercepted in the time domain symbol is the 1544th sample; for the second three-segment structure, the super prefix is intercepted in the time domain symbol The starting position is the 1528th sample.
- P1_A(t) is a time domain expression of a time domain symbol
- N A is a length of a time domain body signal
- Len C is the length of the cyclic prefix
- Len B is the length of the suffix or super prefix
- f SH is the modulation frequency offset value for modulating the time domain symbol
- T is the sampling period
- the length of the time domain body signal is 2048
- the length of the cyclic prefix is 520
- the length of the suffix or super prefix is 504.
- the time domain expression for the first three-segment structure contained in the leading symbol is:
- the method further includes: the time domain body signal is obtained by transforming a frequency domain subcarrier, and the frequency domain subcarrier is generated based on a frequency domain body sequence,
- the step of generating a frequency domain subcarrier includes: a predetermined sequence generation rule for generating a frequency domain subject sequence; and/or processing a frequency domain body sequence for generating a predetermined processing rule for generating a frequency domain subcarrier, and generating a predetermined sequence
- the rule comprises any one or both of the following: based on different sequence generations; and/or based on the same sequence generation, further cyclically shifting the generated sequence
- the predetermined processing rule includes: pre-generating the pre-generated subcarriers processed based on the frequency domain main sequence to perform phase modulation according to the frequency offset value.
- the present invention further provides a method for generating a preamble symbol, further characterized by: generating a time domain symbol having the following three-segment structure based on the obtained time domain body signal; and based on at least one time
- the domain symbol generates a preamble symbol, wherein the generated preamble symbol includes at least one or two time domain symbols, and the time domain symbol has any of the following first three-segment structure or a second three-segment structure, and the first three-segment structure
- the method includes: a time domain body signal, a prefix generated according to a partial time domain body signal intercepted from the time domain body signal, and a suffix generated based on part or all of the partial time domain body signal
- the second three-segment structure includes: The domain body signal, the prefix generated based on the partial time domain body signal intercepted from the time domain body signal, and the super prefix generated based on part or all of the partial time domain body signal.
- the method further includes: the step of generating a prefix, a suffix, or a super prefix, including: the prefix is directly intercepted from the back of the time domain body signal, and the suffix is Or the super prefix is obtained by modulating all or part of the partial time domain symbol corresponding to the prefix.
- the method further includes: the step of generating the prefix, the suffix or the super prefix, including: the signal intercepted from the back of the time domain body signal is followed.
- the first predetermined processing rule is processed to form a prefix
- the signal intercepted from the rear of the time domain body signal is processed according to a second predetermined processing rule to form a suffix or a super prefix.
- the first predetermined processing rule includes: direct copying; or multiplying by one The same fixed coefficient or predetermined different coefficient
- the second predetermined processing rule includes: performing modulation processing when the first predetermined processing rule is a direct copy; or multiplying when the first predetermined processing rule is multiplied by an identical fixed coefficient or a predetermined different coefficient The modulation process is performed with the corresponding coefficients.
- the length of the suffix or the super prefix does not exceed the length of the prefix.
- the method further includes: the step of generating the suffix or the super prefix includes: setting a frequency shift sequence; multiplying part or all of the partial time domain body signal by The frequency shift sequence is followed by a suffix or super prefix.
- the method further includes: wherein the frequency offset sequence of the frequency offset sequence is according to a frequency domain subcarrier spacing corresponding to the time domain body signal or according to a super prefix and a suffix The length is determined by the frequency shift sequence to arbitrarily select the epoch.
- the method for generating a preamble symbol there is further characterized in that, when a combination of a length of a cyclic prefix, a suffix or a length of a super prefix is determined, when a suffix or a super prefix is generated Transmitting signaling information or identifying emergency broadcasts by intercepting portions of the time domain body signals at different starting locations.
- the method further includes: wherein the current pilot symbol includes only one of the first three-segment structure and the second three-segment structure to identify the non- Emergency broadcasts use another to identify emergency broadcasts; or use different ordering between the first three-segment structure and the second three-segment structure to identify emergency broadcasts.
- the method for generating the preamble symbol there is further characterized in that, when the current pilot symbol includes at least two three-segment structures and there are different three-segment structures, the first three-segment structure
- the starting point of the selected suffix or super prefix corresponds to the first sampling point number of the time domain main signal
- the starting point of the second suffix or super prefix in the second three-segment structure corresponds to the second sampling point serial number of the time domain main signal
- the method further includes: the predetermined constraint relationship includes: setting a first sample point number to N1_1, and selecting a second sample point number to N1_2, a time domain body signal.
- the length is N A
- the length of the prefix is Len C
- the length of the suffix or super prefix is Len B
- N1_1+N1_2 2N A -(Len B +Len c ) is satisfied.
- the modulation method used when generating the suffix or the super prefix is a modulation frequency offset
- the first three-segment structure is neutralized.
- the frequency offset values in the second three-segment structure are opposite.
- the method further includes: the preamble symbol includes at least one time domain symbol, and the at least one time domain symbol includes: the first time domain symbol adopts the first type For the three-segment structure, the remaining time-domain symbols of the sub-secondary are respectively the second three-segment structure.
- the method further includes: wherein the length of the time domain body signal is 2048 sampling periods, the prefix length is 520 sampling periods, and the suffix or super prefix length is 504 sampling periods, for the first three-segment structure, the starting position of the suffix intercepted in the time domain symbol is the 1544th sample; for the second three-segment structure, the super prefix is intercepted in the time domain symbol The starting position is the 1528th sample.
- P1_A(t) is a time domain expression of a time domain symbol
- N A is a length of a time domain body signal
- Len C is the length of the cyclic prefix
- Len B is the length of the suffix or super prefix
- f SH is the modulation frequency offset value for modulating the time domain symbol
- T is the sampling period
- the length of the time domain body signal is 2048
- the length of the cyclic prefix is 520
- the length of the suffix or super prefix is 504.
- the time domain expression for the first three-segment structure contained in the leading symbol is:
- the method further includes: the time domain body signal is obtained by transforming a frequency domain subcarrier, and the frequency domain subcarrier is generated based on a frequency domain body sequence,
- the step of generating a frequency domain subcarrier includes: a predetermined sequence generation rule for generating a frequency domain subject sequence; and/or processing a frequency domain body sequence for generating a predetermined processing rule for generating a frequency domain subcarrier, and generating a predetermined sequence
- the rule includes any one or two of the following: generating based on different sequence generation; and/or generating the sequence based on the same sequence generation, and further processing the generated sequence, the predetermined processing rule includes:
- the pre-generated subcarriers obtained by processing the sequence are phase modulated according to the frequency offset value.
- an embodiment of the present invention further provides a method for generating a frequency domain symbol, which includes the following steps: respectively generating a fixed sequence and a signaling sequence in a frequency domain; and interleaving a fixed sequence and a signaling sequence.
- the array is padded to a valid subcarrier for forming a frequency domain symbol.
- the method further includes: the fixed sequence and the signaling sequence are staggered, and the staggered arrangement includes any one of the following two rules: a predetermined interleaving rule: arranged in a parity interleave or an even odd interleave; and a second predetermined interleaving rule: placing a part of the signaling sequence on the odd subcarriers, another part of the signaling sequence on the even subcarriers, and placing a part of the fixed sequence On odd subcarriers, another portion of the fixed sequence is placed on even subcarriers.
- a predetermined interleaving rule arranged in a parity interleave or an even odd interleave
- a second predetermined interleaving rule placing a part of the signaling sequence on the odd subcarriers, another part of the signaling sequence on the even subcarriers, and placing a part of the fixed sequence On odd subcarriers, another portion of the fixed sequence is placed on even subcarriers.
- the method further includes: wherein the current pilot symbol is composed of at least two time domain symbols having a first three-segment structure or a second three-segment structure
- the frequency domain symbol corresponds to a time domain body signal in the time domain symbol
- the at least two time domain symbols satisfy at least one of any of the following three predetermined association rules: a first predetermined association rule: a respective time domain symbol
- the signaling sequence set takes the same amount
- the second predetermined association rule the fixed sequence of the time domain symbols remain the same
- the third predetermined association rule the predetermined number of time domain symbols include the effective subcarrier positions of the fixed sequence and the signaling sequence Is the left or right shift of the entirety of the effective subcarrier positions in the other predetermined time domain symbols.
- an embodiment of the present invention further provides a method for generating a frequency domain symbol, which includes the following steps: generating a frequency domain subject sequence by using a predetermined sequence generation rule; and/or scheduling a frequency domain subject sequence with a predetermined processing rule.
- Processing to generate a frequency domain symbol wherein the predetermined sequence generation rule comprises any one or two combinations of the following: generating based on different sequence generation; and/or generating the sequence based on the same sequence generation, and further cyclically shifting the generated sequence
- the predetermined processing rule includes: pre-generating the pre-generated subcarriers processed based on the frequency domain main sequence to perform phase modulation according to a predetermined frequency offset value.
- the method further includes: wherein, in the predetermined sequence generation rule, the generating step of the sequence generation method includes: different sequence generation formulas by assigning the same constant package The root zero autocorrelation sequence is obtained by different root values, and the same sequence generation is obtained by assigning the same root value to the constant envelope zero autocorrelation sequence.
- the method further includes: wherein, in the step of phase-modulating the frequency offset value based on the pre-generated subcarrier, the same time domain body signal corresponds to The frequency domain subcarriers use the same frequency offset value to phase modulate each of the effective subcarriers in the frequency domain subcarriers, and the frequency domain subcarriers corresponding to the different time domain main signals use different frequency offset values.
- the method further includes: the step of generating a frequency domain body sequence includes: generating a frequency by using a different sequence generation formula in a predetermined sequence generation rule Domain subject sequence.
- the method further includes: generating a frequency domain body sequence: generating a frequency by using different sequence generation formulas in a predetermined sequence generation rule The domain subject sequence continues to utilize the predetermined processing rules for the frequency domain subject sequence to generate frequency domain subcarriers.
- the method further includes: the frequency domain body sequence is generated based on one or more constant envelope zero autocorrelation sequences, and the frequency domain body sequence has a predetermined sequence. Length N ZC .
- each of the constant envelope zero autocorrelation sequences has a separate auto-correlation sequence based on a plurality of constant envelope zero autocorrelation sequences Corresponding subsequence length L M , generating a subsequence having a subsequence length L M for each constant envelope zero autocorrelation sequence according to a predetermined sequence generation rule, and splicing the plurality of subsequences into a frequency domain main sequence having a predetermined sequence length N ZC .
- the method for generating a frequency domain symbol there is further characterized in that, when the frequency domain main sequence for signaling transmission is generated by using a predetermined sequence generation rule, if at least one time The first time domain body signal in the domain body signal adopts a pre-known frequency domain body sequence, and the frequency domain body sequence and the corresponding frequency offset value are not used for transmitting signaling.
- the signaling transmitted by the frequency domain body sequence includes a frame format parameter for indicating a physical frame and/or for indicating Emergency broadcast content, including the leading symbols in the physical frame.
- the method further includes: wherein the processing is performed by using a frequency domain symbol to obtain a time domain body signal, and the at least one time domain symbol formed by the time domain body signal is formed. To generate the leading symbols.
- the method further includes: wherein the frequency domain body sequence has a predetermined sequence length N ZC that is not greater than a Fourier transform length that the time domain body signal has The FFT , the step of obtaining the pre-generated subcarrier based on the frequency domain main sequence processing includes a processing filling step, the processing filling step: mapping the frequency domain main sequence into a positive frequency subcarrier and a negative frequency subcarrier with reference to a predetermined sequence length N ZC ; a Fourier transform length N FFT is filled with a predetermined number of virtual subcarriers and DC subcarriers on the outer edges of the positive frequency subcarriers and the negative frequency subcarriers; and the obtained subcarriers are cyclically shifted to the left so that the zero subcarriers correspond to the inverse The first position of the inner leaf transform.
- the method further includes the following steps, wherein the processing filling step further comprises the following steps: performing PN modulation on the frequency domain main sequence, and then performing mapping, for The PN sequences of the PN modulation of the frequency domain main sequence corresponding to each time domain main signal are the same or different.
- the step of cyclically shifting the predetermined sequence generation rule is performed before or after the PN modulation is performed.
- the method for generating the frequency domain symbols there is further characterized in that the corresponding root value in the first time domain body signal and/or the PN sequence used for PN modulation is utilized.
- Initial phase transfer information is utilized.
- the method further includes: wherein the time domain symbol has the following three-segment structure: wherein the first three-segment structure includes: a time domain body signal, a suffix generated based on all or part of the time domain body signal and a suffix generated based on all or part of the part of the time domain body signal; the second three segment structure includes: a time domain body signal, based on the time domain body signal a prefix generated in whole or in part, and a super prefix generated based on all or part of the partial time domain body signal, the preamble symbol comprising: a time domain symbol having a first three-segment structure; or having a second three-segment structure a time domain symbol; or a free combination of a number of time domain symbols having a first three segment structure and/or a plurality of time domain symbols having a second three segment structure.
- the embodiment of the present invention further provides a method for receiving a preamble symbol, which includes the following steps: processing a received signal; determining whether there is a preamble symbol that is expected to be received in the obtained processed signal; When yes, determining the location of the preamble symbol and solving the signaling information carried by the preamble symbol, wherein the received preamble symbol comprises the transmitting end in any number of the first three-segment structure and/or the second according to a predetermined generation rule.
- the three-segment structure is freely combined to generate at least one time domain symbol
- the first three-segment structure includes: a time domain body signal, a prefix generated based on all or part of the time domain body signal, and all signals based on the part of the time domain body signal Or a partially generated suffix
- the second three-segment structure comprising: a time domain body signal, a prefix generated based on all or part of the time domain body signal, and a super prefix generated based on all or part of the partial time domain body signal.
- the receiving method of the provided preamble symbol further characterized by: determining whether there is a preamble symbol that is expected to be received in the obtained processed signal, and determining that the preamble is determined to be YES
- determining whether there is a preamble symbol that is expected to be received in the obtained processed signal and determining that the preamble is determined to be YES
- At least one of the following steps is included: initial timing synchronization, integer multiple frequency offset estimation, precise timing synchronization, channel estimation, decoding analysis, and fractional multiple frequency offset estimation.
- the receiving method of the provided preamble symbol there is further characterized by: determining, by using at least one of the following, whether there is a preamble symbol that is expected to be received in the processed signal: an initial timing synchronization manner, Integer multiple frequency offset estimation method, precise timing synchronization method, channel estimation method, decoding result analysis method and fractional multiple frequency offset estimation method.
- a position of the preamble symbol is initially determined by an initial timing synchronization manner, and based on a result of the initial timing synchronization, determining the processed signal Whether there is a preamble symbol containing a three-segment structure that is expected to be received.
- the method further includes: wherein the location of the preamble symbol is initially determined by any initial timing synchronization manner, where the first initial timing synchronization manner includes: utilizing a predetermined three-stage time domain structure and/or a processing relationship between any two segments of the second predetermined three-stage time domain structure performs necessary inverse processing on the processed signal and then performs delayed sliding autocorrelation to obtain a basic accumulated correlation value;
- the basic accumulated correlation values are grouped according to different delay lengths of the delay sliding autocorrelation, and each group performs at least one intersymbol delay according to a specific splicing relationship of at least two time domain symbols.
- the relationship matching and/or phase adjustment After the relationship matching and/or phase adjustment, mathematical operations are performed to obtain a final accumulated correlation value of a certain delay length.
- the final accumulated correlation value is the basic accumulated correlation value.
- the operation value is used for the initial timing synchronization, and the second initial timing synchronization mode includes: when the time domain main signal in the three-segment structure of the current pilot symbol contains the known signal, the time domain main signal is according to the predetermined N differences.
- the value is subjected to a difference operation, and the time domain signal corresponding to the known information is also subjected to a difference operation, and then the two are cross-correlated to obtain a differential correlation result of the N sets and the N difference values one by one, based on the N sets of differences
- the correlation result is initially synchronized, and the processed value is obtained for preliminary determining the position of the leading symbol, where N ⁇ 1, wherein, when the first initial timing synchronization manner and the second initial timing synchronization manner are completed, the respectively obtained processing values are further subjected to a weighting operation, and initial timing synchronization is completed based on the weighted operation values.
- the method includes: when the time domain symbols including two three-segment structures are included, the basis is The accumulated correlation values are grouped according to different delay lengths of the delay sliding autocorrelation, and each group performs a mathematical operation on the delay relationship matching and/or phase adjustment according to the specific splicing relationship of the two time domain symbols to obtain a plurality of certain The final accumulated correlation value of a delay length.
- the number of delays implemented in each delay sliding autocorrelation process is further included Perform a certain range of adjustments to form a plurality of adjusted delay numbers, and then perform a plurality of delay sliding autocorrelations according to the obtained adjusted multiple delay numbers and the number of delays, and select the most obvious related result as the basic accumulated correlation value.
- the method further includes: wherein the N difference values are selected according to any at least one predetermined difference selection rule for performing initial synchronization: first
- the predetermined differential selection rule includes: selecting any number of different difference values within a length range of the local time domain sequence corresponding to the known information; and the second predetermined difference selection rule includes: localizing corresponding to the known information Within the length of the time domain sequence, select several different values that satisfy the arithmetic progression.
- the receiving method of the provided preamble symbol further having a feature, wherein when the N difference values are selected by the first predetermined difference selection rule, the obtained one-to-one correspondence is obtained
- the N sets of differential correlation results are weighted by absolute value addition or averaging; or when selected by a first predetermined differential selection rule or a second predetermined differential selection rule, based on the selected N sets of differential correlations
- the result is weighted vector addition or averaging.
- the receiving method of the provided preamble symbol further having a feature, wherein, based on a result of the initial timing synchronization mode, if it is detected that the result satisfies a preset condition, determining to determine the processed signal
- the preset condition includes: performing a specific operation based on the initial timing synchronization result, and then determining whether the maximum value of the operation result exceeds a predetermined threshold threshold, or further combining the integer multiple frequency offset estimation result and / or decode the result to determine.
- the fractional multiple frequency offset estimation is performed by using a result of the first initial timing synchronization manner and/or the second initial timing synchronization manner
- the result includes a predetermined processing operation based on a processing relationship corresponding to the time domain body signal and the prefix in the first three-segment structure and/or the second three-segment structure.
- the result of the first initial timing synchronization manner further comprises the time domain according to the first three-segment structure and/or the second three-segment structure
- the result of an initial timing synchronization mode and a second initial timing synchronization mode is based on any one or any of the first fractional multiple frequency offset value, the second fractional multiple frequency offset value, and the third fractional multiple frequency offset value
- the method further includes: wherein the receiving method of the preamble symbol further comprises: performing fractional multiple frequency offset estimation by using a result of the initial timing synchronization manner.
- the method further includes: wherein, in determining the location of the preamble symbol and solving the signaling information carried by the preamble symbol, the method includes: utilizing All or part of the time domain waveform of the preamble symbol and/or the frequency domain signal obtained by Fourier transform of all or part of the time domain waveform of the preamble symbol to solve the signaling information carried by the preamble symbol.
- the method further includes: wherein, in the predetermined generation rule, the generated preamble symbol comprises: a plurality of the first three segments that are arranged in no particular order a free combination of time domain symbols of the structure and/or several time domain symbols having a second three-segment structure comprising: a time domain body signal, a prefix generated based on the back of the time domain body signal And a suffix generated based on the back of the time domain body signal, the second three-segment structure includes: a time domain body signal, a prefix generated based on the back of the time domain body signal, and a signal based on the time domain body signal The super prefix generated by the department.
- the transmitting end realizes transmission when a partial signal is intercepted from the time domain body signal with a different starting point to generate a suffix or a super prefix.
- the signaling is parsed based on the different delay relationships between the prefix and the suffix or super-prefix, and/or the time domain body signal and the suffix or super-prefix.
- the parsed signaling comprises an emergency broadcast.
- the preamble symbol is processed by using a frequency domain symbol
- the generating step of the frequency domain symbol comprises: separately generating the fixed sequence
- the signaling sequence is arranged in a predetermined arrangement rule and then padded onto the effective subcarriers.
- the method further includes the step of: decoding the signaling information carried by the preamble symbol, including: by including all or part of the signaling sequence subcarriers The signal is compared with the signalling sequence subcarrier set or the time domain signal corresponding to the whole or part of the signaling sequence subcarrier set to solve the signaling information carried by the signaling sequence subcarrier in the preamble symbol.
- the receiving method of the provided preamble symbol there is further characterized in that precise timing synchronization is performed by using a fixed subcarrier sequence included in at least one time domain symbol.
- the receiving method of the provided preamble symbol there is further characterized in that, when the time domain body signal or the corresponding frequency domain body signal in the current pilot symbol includes a known signal, the reception of the preamble symbol
- the method further includes performing integer multiple frequency offset estimation in any of the following manners: according to the result of the initial timing synchronization, intercepting a time domain signal including at least all or part of the time domain body signal, and using the frequency sweeping method to intercept the time domain of the segment After the signals are modulated with different frequency offsets, a number of N frequency-swept time domain signals corresponding to the frequency offset values are obtained, and the known time domain signals obtained by inverse Fourier transform of the known frequency domain sequences are used for each sweep.
- the frequency-domain signal is subjected to sliding cross-correlation, the maximum correlation peaks of the N cross-correlation results are compared, and the frequency offset value of the frequency-domain time domain signal corresponding to the largest cross-correlation result is an integer multiple frequency offset estimation value.
- the Fourier transform is performed by intercepting the time domain signal of the length of the main body time domain signal according to the result of the initial timing synchronization, and the obtained frequency domain subcarrier is pressed within the frequency sweep range.
- Performing cyclic shifting with the shift value intercepting the receiving sequence corresponding to the effective subcarrier, performing predetermined operations on the received sequence and the known frequency domain sequence, and performing inverse transform, and grouping one by one based on the plurality of sets of shift values
- the inverse transform result is selected to obtain an optimal shift value, and an integer multiple frequency offset estimation value is obtained by using the correspondence between the bit value and the integer multiple frequency offset estimation value.
- the method further includes: the step of channel estimation, including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous time domain body After the signal decoding is completed, the obtained decoded information is used as the known information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- Channel estimation for signaling resolution of the next time domain body signal including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous time domain body After the signal decoding is completed, the obtained decoded information is used as the known information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- the method further includes: the received preamble symbol is obtained by processing the frequency domain subcarrier, and the frequency domain subcarrier is generated based on the frequency domain body sequence.
- the step of generating a frequency domain subcarrier includes: generating a predetermined sequence generation rule for generating a frequency domain body sequence; and/or processing the frequency domain body sequence for generating frequency domain subcarriers a predetermined processing rule, the predetermined sequence generation rule comprising any one or two combinations of the following: generating based on different sequence generation; and/or generating the sequence based on the same sequence generation, further cyclically shifting the generated sequence, predetermined processing rule
- the method includes: performing phase modulation on the pre-generated subcarriers processed according to the frequency domain main sequence according to the frequency offset value.
- the receiving method of the provided preamble symbol there is further characterized in that, in the case that the first one of the at least one time domain symbol included in the preamble symbol contains the known information, the known The signal is accurately timed synchronized.
- the receiving method of the provided preamble symbol there is further characterized in that, in the step of parsing the signaling information, all possible different root values of the frequency domain body sequence transmitted by the transmitting end are utilized. / or a set of known signaling sequences resulting from different frequency domain shift values and all possible frequency domain modulation frequency offset values to resolve the signaling.
- the receiving method of the provided preamble symbol there is further characterized in that, when the time domain body signal or the corresponding frequency domain body signal in the current pilot symbol includes a known signal, the reception of the preamble symbol
- the method further includes performing integer multiple frequency offset estimation in any of the following manners: according to the result of the initial timing synchronization, intercepting a time domain signal including at least all or part of the time domain body signal, and using the frequency sweeping method to intercept the time domain of the segment After the signals are modulated with different frequency offsets, a plurality of N frequency-swept time domain signals corresponding to the frequency offset values are obtained, and the known time domain signals obtained by transforming the known frequency domain sequences and each of the frequency-swept time domain signals are obtained.
- the frequency offset value of the swept time domain signal corresponding to the largest cross-correlation result is an integer multiple frequency offset estimation value; or
- the result of the initial timing synchronization intercepts the time domain signal of the length of the main body time domain signal and performs Fourier transform, and shifts the obtained frequency domain subcarriers into different frequency sweep ranges.
- Performing cyclic shifting intercepting a receiving sequence corresponding to the effective subcarrier, performing predetermined operations on the received sequence and the known frequency domain sequence, and performing inverse transform, and performing inverse transform results based on one-to-one correspondence of the plurality of sets of shift values Selecting, obtaining the optimal shift value, and obtaining the integer multiple frequency offset estimation value by using the correspondence between the bit value and the integer multiple frequency offset estimation value.
- the method further includes: the step of channel estimation, including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous time domain body After the signal decoding is completed, the obtained decoded information is used as the known information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- Channel estimation for signaling resolution of the next time domain body signal including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous time domain body After the signal decoding is completed, the obtained decoded information is used as the known information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- the method further includes: after completing the integer frequency offset estimation, the frequency offset is compensated, and then the transmission signaling is parsed.
- the receiving method of the provided preamble symbol there is further characterized in that, during the generation process of the frequency domain subcarrier, the generation based on the different sequence generation and/or the generation based on the same sequence are adopted.
- the generated sequence is further cyclically shifted, the frequency domain signaling subcarrier and the channel estimation value and all possible frequency domain subject sequences are subjected to specific mathematical operations for signaling analysis, wherein the specific mathematical operation includes any one of the following Species: Maximum likelihood correlation operation combined with channel estimation; or channel equalization of channel estimation values to frequency domain signaling subcarriers, and then correlation operations with all possible frequency domain subject sequences, selecting the maximum correlation value as signaling analysis The decoding result.
- the method further includes: performing phase modulation or inverse FFT on the pre-generated subcarrier with the frequency offset value in the process of generating the frequency domain subcarrier.
- the leaf transform is cyclically shifted in the time domain.
- the method further includes: wherein, in determining the location of the preamble symbol and parsing the signaling information carried by the preamble symbol, the method includes: The time domain main signal of the time domain symbol is subjected to Fourier transform to extract a valid subcarrier; each valid subcarrier and the known frequency domain signaling of the time domain symbol are concentrated in a known sub-sequence corresponding to each frequency domain known sequence.
- the carrier and the channel estimate are subjected to a predetermined mathematical operation followed by an inverse Fourier transform, and an inverse Fourier result is obtained corresponding to each frequency domain known sequence; and each time domain symbol is selected based on the first predetermined
- the rule selects an inverse Fourier selection result from one or more inverse Fourier results, and performs predetermined processing operations between the plurality of time domain symbols, and solves signaling information based on the obtained intersymbol processing result. .
- the inverse Fourier selection result is taken as an absolute value or an absolute value squared, and then the first predetermined selection rule Select the inverse Fourier selection result.
- the first predetermined selection rule comprises selecting with a peak maximum and/or selecting with a peak-to-average ratio maximum.
- a noise filtering processing step comprising: performing a filtering process on the inverse Fourier result of each time domain symbol, The large value is retained and the small value is all set to zero.
- the method further includes: the parsed signaling information includes: different frequency domain sequence transmission signaling and/or frequency domain modulation frequency offset real-time domain The signal is transmitted by the cyclic shift value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the first predetermined selection rule is The unique inverse Fourier result of each time domain symbol is directly taken as the inverse Fourier selection result, and then predetermined processing operations are performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained intersymbol processing result.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the receiving method of the provided preamble symbol there is further characterized in that a predetermined processing operation is performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained inter-symbol processing result.
- the step includes: cyclically shifting the latter time domain symbol, multiplying or conjugate multiplied with the previous time domain symbol, and accumulating to obtain an accumulated value, and finding corresponding to all predetermined frequency offset values or cyclic shift values The shift value having the largest accumulated value is derived from the shift value to derive signaling information.
- the method further includes: wherein, in determining the location of the preamble symbol and parsing the signaling information carried by the preamble symbol, the step includes: The known frequency domain signaling set of each time domain symbol is extended to a known frequency domain signaling extension set; the time domain body signal of each time domain symbol is Fourier transformed to extract effective subcarriers; The effective subcarriers perform predetermined mathematical operations on the known subcarriers corresponding to the known sequence of each frequency domain in the known frequency domain signaling extension set, and the channel estimation values to obtain an operation value, and then perform the accumulation of the operation values on all the effective subcarriers; The second predetermined selection rule selects an accumulated value from the plurality of accumulated values, and uses the frequency domain known sequence of the corresponding known frequency domain signaling extension set to derive the frequency domain modulation frequency offset value instantaneous domain cyclic shift
- the signaling is transmitted, and the known frequency domain sequence in the known frequency domain signaling set before the original unexpanded
- the second predetermined selection rule comprises selecting to take an absolute value maximum value or a real part maximum value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the known frequency domain signaling extension set is obtained by: each of the known frequency domain signaling sets is The known frequency-frequency domain sequence modulates the sub-carrier phase according to all possible frequency offset values, and all possible S-modulation frequency offset values thereof will generate a known sequence after S modulation frequency offsets.
- the known frequency domain signaling set has only one known sequence, that is, only depends on frequency domain modulation.
- the frequency domain signaling extension set includes a total of S known frequency domain sequences, and the corresponding frequency domain signaling extension set corresponding to the modulation frequency offset s is utilized.
- the frequency domain known sequence can be used to derive the modulation frequency offset value, and obtain the signaling information of the frequency domain modulation frequency offset real-time cyclic shift transmission.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the method further includes: wherein, in determining the location of the preamble symbol in the physical frame and parsing the signaling information carried by the preamble symbol, : performing Fourier transform on the time domain main signal of each time domain symbol to extract valid subcarriers; and each known frequency carrier and the known frequency domain signaling of the time domain symbol are concentrated in each frequency domain known sequence Corresponding known subcarriers and channel estimation values are subjected to a predetermined mathematical operation and then inverse Fourier transform, corresponding to each frequency domain known sequence to obtain an inverse Fourier result; and each time domain symbol is selected based on the first predetermined
- the rule selects an inverse Fourier selection result from one or more inverse Fourier results, and performs predetermined processing operations between the plurality of time domain symbols, and solves signaling information based on the obtained intersymbol processing result.
- the method further includes: the predetermined transmission rule includes: processing, by using the frequency domain main sequence corresponding to the time domain main signal in each time domain symbol sent After the pre-generated subcarriers are generated, each effective subcarrier is subjected to phase modulation or inverse Fourier transform with a predetermined frequency offset value S in the frequency domain, and then cyclically shifted in the time domain.
- the predetermined transmission rule includes: processing, by using the frequency domain main sequence corresponding to the time domain main signal in each time domain symbol sent After the pre-generated subcarriers are generated, each effective subcarrier is subjected to phase modulation or inverse Fourier transform with a predetermined frequency offset value S in the frequency domain, and then cyclically shifted in the time domain.
- the receiving method of the provided preamble symbol further having such a feature, further comprising: taking an absolute value or an absolute value squared for the inverse Fourier selection result, and then selecting by the first predetermined The rule selects the result of the inverse Fourier selection.
- the first predetermined selection rule comprises selecting with a peak maximum and/or selecting with a peak-to-average ratio maximum.
- a noise filtering processing step comprising: performing a filtering process on the inverse Fourier result of each time domain symbol, The large value is retained and the small value is all set to zero.
- the method further includes: the parsed signaling information includes: different frequency domain sequence transmission signaling and/or frequency domain modulation frequency offset real-time domain The signal is transmitted by the cyclic shift value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the first predetermined selection rule is The unique inverse Fourier result of each time domain symbol is directly taken as the inverse Fourier selection result, and then predetermined processing operations are performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained intersymbol processing result.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the receiving method of the provided preamble symbol there is further characterized in that a predetermined processing operation is performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained inter-symbol processing result.
- the step includes: cyclically shifting the latter time domain symbol, multiplying or conjugate multiplied with the previous time domain symbol, and accumulating to obtain an accumulated value, and finding corresponding to all predetermined frequency offset values or cyclic shift values The shift value having the largest accumulated value is derived from the shift value to derive signaling information.
- an embodiment of the present invention further provides a method for receiving a preamble symbol, including the steps of: processing a received signal; determining whether there is a preamble symbol that is expected to be received in the obtained processed signal; When the determination is yes, the location of the preamble symbol is determined and the signaling information carried by the preamble symbol is solved, where the received preamble symbol is processed by using a frequency domain symbol, and the step of generating the frequency domain symbol includes: The generated fixed sequence and signaling sequence are arranged in a predetermined arrangement rule and then filled onto valid subcarriers.
- the receiving method of the provided preamble symbol there is further characterized by: determining, by using at least one of the following, whether there is a preamble symbol that is expected to be received in the processed signal: an initial timing synchronization manner, Integer multiple frequency offset estimation method, precise timing synchronization method, channel estimation method, decoding result analysis method and fractional multiple frequency offset estimation method.
- the receiving method of the provided preamble symbol further characterized by: determining whether there is a preamble symbol that is expected to be received in the obtained processed signal; and determining the preamble when the determination is yes
- the step of solving the position of the symbol and solving the signaling information carried by the preamble symbol includes at least one of the following steps: initial timing synchronization, integer multiple frequency offset estimation, precise timing synchronization, channel estimation, decoding analysis, and fractional multiple Frequency offset estimation.
- the receiving method of the provided preamble symbol further characterized by: performing integer multiple frequency offset estimation or channel estimation by using a fixed sequence, comprising the following steps: according to the determined position of the leading symbol, Intercepting a signal including all or a part of the fixed subcarriers; and computing the signal including all or part of the fixed subcarriers with a frequency domain fixed subcarrier sequence or a time domain signal corresponding to the frequency domain fixed subcarrier sequence to obtain an integer multiple frequency Bias estimation or channel estimation.
- the receiving method of the provided preamble symbol there is further characterized in that precise timing synchronization is performed by using a fixed subcarrier sequence included in at least one time domain symbol in the preamble symbol.
- the method further includes: wherein, in determining the location of the preamble symbol and solving the signaling information carried by the preamble symbol, the method includes: utilizing All or part of the time domain waveform of the preamble symbol and/or the frequency domain signal obtained by Fourier transform of all or part of the time domain waveform of the preamble symbol to solve the signaling information carried by the preamble symbol.
- the receiving method of the provided preamble symbol there is further characterized in that, when the time domain body signal or the corresponding frequency domain body signal in the current pilot symbol includes a known signal, the reception of the preamble symbol
- the method further includes the step of performing any one of the following integer frequency offset estimation: intercepting a time domain signal including at least all or part of the time domain body signal according to the result of the initial timing synchronization, and using the frequency sweeping method to intercept the segment
- the time domain signal is modulated with different frequency offsets, a plurality of N frequency-swept time domain signals corresponding to the frequency offset values are obtained, and the known time domain signals obtained by inversely transforming the known frequency domain sequences and each frequency sweep are obtained.
- the maximum correlation peak of the N cross-correlation results is compared, and the frequency offset value of the frequency-domain time domain signal corresponding to the largest cross-correlation result is an integer multiple frequency offset estimation value; Or performing a Fourier transform on the time domain signal that intercepts the length of the main body time domain signal according to the result of the initial timing synchronization, and the obtained frequency domain subcarrier is not in the frequency sweep range.
- the shift value is cyclically shifted, and the receiving sequence corresponding to the effective subcarrier is intercepted, and the received sequence and the known frequency domain sequence are subjected to predetermined operations and then inverse Fourier transform is performed, and the one-to-one correspondence based on the plurality of sets of shift values is performed.
- Several sets of inverse transform results are selected to obtain an optimal shift value, and an integer multiple frequency offset estimation value is obtained by using the correspondence between the bit value and the integer multiple frequency offset estimation value.
- the method further includes the step of: decoding the signaling information carried by the preamble symbol, including: by including all or part of the signaling sequence subcarriers
- the signal is calculated by the time domain signal corresponding to the signaling sequence subcarrier set or the signaling sequence subcarrier set to solve the signaling information carried by the signaling sequence subcarrier in the preamble symbol.
- an embodiment of the present invention further provides a method for receiving a preamble symbol, including the steps of: processing a received signal; determining whether there is a preamble symbol that is expected to be received in the obtained processed signal; When the determination is yes, the location of the preamble symbol is determined and the signaling information carried by the preamble symbol is solved, where the received preamble symbol is obtained by performing inverse Fourier transform on the frequency domain subcarrier, and the frequency domain subcarrier is obtained.
- Generating a frequency domain subcarrier based on the frequency domain main sequence comprising: generating a predetermined sequence generation rule for generating a frequency domain main sequence; and/or processing the frequency domain main sequence for generating a frequency domain subcarrier a predetermined processing rule, the predetermined sequence generation rule comprising any one or two combinations of the following: generating based on different sequence generation; and/or generating the sequence based on the same sequence generation, further cyclically shifting the generated sequence, predetermined processing rule
- the method comprises: phase-modulating a pre-generated subcarrier processed according to a frequency domain main sequence according to a frequency offset value
- the receiving method of the provided preamble symbol further characterized by: determining whether there is a preamble symbol that is expected to be received in the obtained processed signal, and determining that the preamble is determined to be YES
- the step of solving the position of the symbol and solving the signaling information carried by the preamble symbol includes at least one of the following steps: initial timing synchronization, integer multiple frequency offset estimation, precise timing synchronization, channel estimation, decoding analysis, and fractional multiple Frequency offset estimation.
- the receiving method of the provided preamble symbol there is further characterized by: determining, by using at least one of the following, whether there is a preamble symbol that is expected to be received in the processed signal: an initial timing synchronization manner, Integer multiple frequency offset estimation method, precise timing synchronization method, channel estimation method, and decoding result analysis method. Perform fractional octave bias estimation.
- the receiving method of the provided preamble symbol there is further characterized in that, when the first one of the at least one time domain symbol in the current pilot symbol contains the known information, the known signal is used to perform the precision. Timing synchronization.
- the method further includes: the step of channel estimation, including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous one After the domain main signal is decoded, the obtained decoded information is used as the transmission information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- Channel estimate for signaling resolution of the next time domain body signal including: performing in the time domain arbitrarily and/or in the frequency domain: when the previous one After the domain main signal is decoded, the obtained decoded information is used as the transmission information, and the channel estimation is performed again in the time domain/frequency domain, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result.
- the receiving method of the provided preamble symbol there is further characterized in that, when the time domain body signal or the corresponding frequency domain body signal in the current pilot symbol includes a known signal, the reception of the preamble symbol
- the method further includes performing an integer multiple frequency offset estimation in any of the following manners: after sweeping all or part of the time domain signals intercepted by different frequency offsets, a plurality of frequency sweep time domain signals are obtained, which are known frequencies.
- the frequency offset value modulated by the swept time domain signal of the maximum correlation peak is an integer multiple frequency offset estimation value;
- the frequency domain subcarrier obtained by performing the Fourier transform on the main time domain signal according to the position result of the initial timing synchronization is cyclically shifted according to different shift values in the frequency sweeping range, and the receiving sequence corresponding to the effective subcarrier is intercepted.
- the method further includes: after completing the integer frequency offset estimation, the frequency offset is compensated, and then the transmission signaling is parsed.
- the receiving method of the provided preamble symbol there is further characterized in that, during the generation process of the frequency domain subcarrier, the generation based on the different sequence generation and/or the generation based on the same sequence are adopted.
- the generated sequence is further cyclically shifted, the frequency domain signaling subcarrier and the channel estimation value and all possible frequency domain subject sequences are subjected to specific mathematical operations for signaling analysis, wherein the specific mathematical operation includes any one of the following Species: Maximum likelihood correlation operation combined with channel estimation; or channel equalization of channel estimation values to frequency domain signaling subcarriers, and then correlation operations with all possible frequency domain subject sequences, selecting the maximum correlation value as signaling analysis The decoding result.
- the method further includes: wherein, in determining the location of the preamble symbol and solving the signaling information carried by the preamble symbol, the method includes: utilizing All or part of the time domain waveform of the preamble symbol and/or the frequency domain signal obtained by Fourier transform of all or part of the time domain waveform of the preamble symbol to solve the signaling information carried by the preamble symbol.
- the method further includes: performing phase modulation or inverse FFT on the pre-generated subcarrier with the frequency offset value in the process of generating the frequency domain subcarrier.
- the leaf transform is cyclically shifted in the time domain.
- the method further includes: wherein, in determining the location of the preamble symbol and parsing the signaling information carried by the preamble symbol, the method includes: The time domain main signal of the time domain symbol is subjected to Fourier transform to extract a valid subcarrier; each valid subcarrier and the known frequency domain signaling of the time domain symbol are concentrated in a known sub-sequence corresponding to each frequency domain known sequence.
- the carrier and the channel estimate are subjected to a predetermined mathematical operation followed by an inverse Fourier transform, and an inverse Fourier result is obtained corresponding to each frequency domain known sequence; and each time domain symbol is based on a first predetermined selection rule from one or
- the inverse Fourier selection result selected from the plurality of inverse Fourier results is subjected to a predetermined processing operation between the plurality of time domain symbols, and the signaling information is solved based on the obtained intersymbol processing result.
- the receiving method of the provided preamble symbol further having such a feature, further comprising: taking an absolute value or an absolute value squared for the inverse Fourier selection result, and then selecting by the first predetermined The rule selects the result of the inverse Fourier selection.
- the first predetermined selection rule comprises selecting with a peak maximum and/or selecting with a peak-to-average ratio maximum.
- a noise filtering processing step comprising: performing a filtering process on the inverse Fourier result of each time domain symbol, The large value is retained and the small value is all set to zero.
- the method further includes: the parsed signaling information includes: different frequency domain sequence transmission signaling and/or frequency domain modulation frequency offset real-time domain The signal is transmitted by the cyclic shift value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the first predetermined selection rule is The unique inverse Fourier result of each time domain symbol is directly taken as the inverse Fourier selection result, and then predetermined processing operations are performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained intersymbol processing result.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the receiving method of the provided preamble symbol there is further characterized in that a predetermined processing operation is performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained inter-symbol processing result.
- the step includes: cyclically shifting the latter time domain symbol, multiplying or conjugate multiplied with the previous time domain symbol, and accumulating to obtain an accumulated value, and finding corresponding to all predetermined frequency offset values or cyclic shift values The shift value having the largest accumulated value is derived from the shift value to derive signaling information.
- the method further includes: wherein, in determining the location of the preamble symbol and parsing the signaling information carried by the preamble symbol, the step includes: The known frequency domain signaling set of each time domain symbol is extended to a known frequency domain signaling extension set; the time domain body signal of each time domain symbol is Fourier transformed to extract effective subcarriers; The effective subcarriers perform predetermined mathematical operations on the known subcarriers corresponding to the known sequence of each frequency domain in the known frequency domain signaling extension set, and the channel estimation values to obtain an operation value, and then perform the accumulation of the operation values on all the effective subcarriers; The second predetermined selection rule selects an accumulated value from the plurality of accumulated values, and uses the corresponding Knowing the frequency domain known sequence of the frequency domain signaling extension set, and deriving the frequency domain modulation frequency offset value to transmit the signal in the real domain cyclic shift, and extracting the corresponding known frequency domain signal before the original unexpanded
- the known frequency domain signaling set of each time domain symbol is extended to
- the method further includes: wherein the predetermined sending rule includes: adopting a frequency offset value for the pre-generated subcarrier in the generating process of the frequency domain subcarrier Cyclic shifting in the time domain after modulation or inverse Fourier transform.
- the second predetermined selection rule comprises selecting to take an absolute value maximum value or a real part maximum value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the known frequency domain signaling extension set is obtained by: each of the known frequency domain signaling sets is The known frequency-frequency domain sequence modulates the sub-carrier phase according to all possible frequency offset values, and all possible S-modulation frequency offset values thereof will generate a known sequence after S modulation frequency offsets.
- the known frequency domain signaling set has only one known sequence, that is, only depends on frequency domain modulation.
- the frequency domain signaling extension set includes a total of S known frequency domain sequences, and the corresponding frequency domain signaling extension set corresponding to the modulation frequency offset s is utilized.
- the frequency domain known sequence can be used to derive the modulation frequency offset value, and obtain the signaling information of the frequency domain modulation frequency offset real-time cyclic shift transmission.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the method further includes the step of: determining the location of the preamble symbol in the physical frame and parsing the signaling information carried by the preamble symbol, the step The method comprises: performing Fourier transform on a time domain main signal of each time domain symbol to extract a valid subcarrier; and each valid frequency carrier and the known frequency domain signaling of the time domain symbol are known in each frequency domain.
- the known subcarrier corresponding to the sequence and the channel estimation value are subjected to a predetermined mathematical operation and then inverse Fourier transform, and an inverse Fourier result is obtained corresponding to each frequency domain known sequence; and each time domain symbol is based on the first predetermined selection
- the anti-Fourier selection result selected from one or more inverse Fourier results is determined, and then predetermined processing operations are performed between the plurality of time domain symbols, and the signaling is solved based on the obtained inter-symbol processing result. information.
- the method further includes: a predetermined transmission rule, where: the frequency domain body sequence corresponding to the time domain body signal in each time domain symbol sent is processed. After the pre-generated subcarriers are generated, each effective subcarrier is subjected to phase modulation or inverse Fourier transform with a predetermined frequency offset value S in the frequency domain, and then cyclically shifted in the time domain.
- the receiving method of the provided preamble symbol further having such a feature, further comprising: taking an absolute value or an absolute value squared for the inverse Fourier selection result, and then using the first predetermined The selected rule selects the inverse Fourier selection result.
- the first predetermined selection rule comprises selecting with a peak maximum and/or selecting with a peak-to-average ratio maximum.
- a noise filtering processing step comprising: filtering the inverse Fourier result of each time domain symbol Processing, retain large values, all small values are set to zero.
- the method further includes: the parsed signaling information includes: different frequency domain sequence transmission signaling and/or frequency domain modulation frequency offset real-time domain The signal is transmitted by the cyclic shift value.
- the known frequency domain signaling set refers to a frequency domain subcarrier modulation phase of the main time domain signal corresponding to each time domain symbol. All possible sequences of the frequency domain sequence pre-filled to the subcarriers.
- the first predetermined selection rule is The unique inverse Fourier result of each time domain symbol is directly taken as the inverse Fourier selection result, and then predetermined processing operations are performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained intersymbol processing result.
- the predetermined mathematical operation comprises: conjugate multiplication or division.
- the receiving method of the provided preamble symbol there is further characterized in that a predetermined processing operation is performed between the plurality of time domain symbols, and the signaling information is solved based on the obtained inter-symbol processing result.
- the step includes: cyclically shifting the latter time domain symbol, multiplying or conjugate multiplied with the previous time domain symbol, and accumulating to obtain an accumulated value, and finding corresponding to all predetermined frequency offset values or cyclic shift values The shift value having the largest accumulated value is derived from the shift value to derive signaling information.
- an embodiment of the present invention further provides a device for generating a preamble symbol, including: a time domain symbol generating unit, generating a time domain symbol having the following three-segment structure based on a time domain body signal; and a preamble symbol a generating unit, generating a preamble symbol based on the at least one time domain symbol, where the preamble symbol generated by the preamble symbol generating unit includes: a time domain symbol having a first three-segment structure; or a time domain symbol having a second three-segment structure Or a free combination of a number of time domain symbols having a first three-segment structure and/or a number of time domain symbols having a second three-segment structure, the first type
- the three-segment structure includes: a time domain body signal, a prefix generated according to a partial time domain body signal intercepted from the time domain body signal, a modulation signal generated based on part or all of the partial time domain body signal
- an embodiment of the present invention further provides a preamble symbol generating apparatus, including: a time domain symbol generating unit, generating a time domain symbol having the following three-stage structure based on the obtained time domain main signal; And a preamble symbol generating unit, configured to generate a preamble symbol based on the at least one time domain symbol, where the preamble symbol generated by the preamble symbol generating unit includes at least one or two time domain symbols, and the time domain symbol has any of the following first three segment structures Or a second three-segment structure, the first three-segment structure comprising: a time domain body signal, a prefix generated according to a partial time domain body signal intercepted from the time domain body signal, and a part or all of the signal based on the part of the time domain body
- the generated suffix, the second three-segment structure includes: a time domain body signal, a prefix generated according to a partial time domain body signal intercepted from the time domain body signal, and a part or all generated
- an embodiment of the present invention further provides a frequency domain symbol generating apparatus, including: a sequence generating unit that respectively generates a fixed sequence and a signaling sequence in a frequency domain; and a frequency domain symbol generating unit that The fixed sequence and the signaling sequence are interleaved and padded to valid subcarriers for forming frequency domain symbols.
- an embodiment of the present invention further provides a frequency domain symbol generating apparatus, including: a sequence generating unit that generates a frequency domain subject sequence by using a predetermined sequence generating rule; and/or a frequency domain symbol generating unit,
- the frequency domain body sequence is processed by a predetermined processing rule to generate a frequency domain symbol
- the predetermined sequence generation rule in the sequence generating unit includes any one or two of the following combinations: based on different order Generating a column generator; and/or generating the sequence based on the same sequence generation, further cyclically shifting the generated sequence
- the predetermined processing rule in the frequency domain symbol generating unit includes: pre-generating the pre-generated sub-process based on the frequency domain main body sequence
- the carrier is phase modulated according to a predetermined frequency offset value.
- an embodiment of the present invention further provides a receiving apparatus for a preamble symbol, including: a receiving processing unit that processes a received signal; and a determining unit that determines whether there is a desired received signal in the obtained processed signal. a preamble symbol; and a positioning parsing unit, determining the location of the preamble symbol and determining the signaling information carried by the preamble symbol when the determination is yes, wherein the preamble symbol received by the receiving processing unit includes the transmitting end according to a predetermined generation rule At least one time domain symbol generated by freely combining any number of the first three-segment structure and/or the second three-segment structure, and the first three-segment structure includes: a time domain body signal, which is generated in whole or in part based on the time domain body signal a prefix, and a suffix generated based on all or part of the partial time domain body signal, the second three-segment structure comprising: a time domain body signal, a prefix generated based on
- an embodiment of the present invention further provides a receiving apparatus for a preamble symbol, including: a receiving processing unit that processes a received signal; and a determining unit that determines whether there is a desired received signal in the obtained processed signal. a preamble symbol; and a positioning parsing unit, determining the location of the preamble symbol and determining the signaling information carried by the preamble symbol when the determination is yes, wherein the preamble symbol received by the receiving processing unit is processed by the frequency domain symbol,
- the generating of the frequency domain symbols includes: respectively, the fixed sequence and the signaling sequence generated separately are arranged in a predetermined arrangement rule and then filled onto the effective subcarriers.
- an embodiment of the present invention further provides a receiving apparatus for a preamble symbol, including: a receiving processing unit that processes a received signal; and a determining unit that determines whether there is a desired received signal in the obtained processed signal. a preamble symbol; and a positioning parsing unit, determining the location of the preamble symbol and determining signaling information carried by the preamble symbol when the determination is yes, wherein the preamble symbol received by the receiving processing unit is based on performing frequency domain subcarriers Obtaining an inverse Fourier transform, the frequency domain subcarrier is generated based on a frequency domain main sequence, and in the step of generating a frequency domain subcarrier, the method includes: generating a predetermined sequence generation rule for generating a frequency domain main sequence; and/or a frequency domain The subject sequence is processed to generate predetermined processing rules for the frequency domain subcarriers, and the predetermined sequence generation rule includes any one or two combinations of the following: generating based on different sequence generations; and/or generating based based
- the preamble symbols can be, but are not limited to, time domain symbols containing one or two three-segment structures.
- the part is used as a prefix to implement coherent detection, which solves the problem of non-coherent detection performance degradation and DBPSK differential decoding failure under complex frequency selective fading channel, and based on the above-mentioned intercepted cyclic prefix length time domain main signal Or partially generating a modulated signal such that the generated preamble symbol has good fractional multiple frequency offset estimation performance and timing synchronization performance.
- the time domain symbol having the three-segment structure may be selected as the preamble symbol according to the requirements of transmission efficiency and robustness; when the current pilot symbol includes at least one symbol of the three-segment structure, based on the same OFDM symbol body, Signaling is transmitted by utilizing different starting points of the second portion selected from the first portion, such as emergency broadcasts, hook information, transmitter flag information, or other transmission parameters.
- the emergency broadcast is identified by designing two different three-segment structures; when the symbols of the two three-segment structures are transmitted as the preamble symbols, the two OFDM symbol bodies are different, and the three-segment structure is also used. Differently, on this basis, the emergency broadcast is identified by the sequential arrangement of the two three-segment structures. Through the three-segment structure with two different symbols, the problem of small partial estimation failure occurring under certain special-length multipath channels can be avoided.
- the use of three segments of partially identical content ensures that significant peaks can be obtained at the receiving end using delayed sliding autocorrelation.
- the modulation signal of the time domain body information is designed to avoid continuous wave interference or single frequency interference at the receiving end, or a multipath channel having a length equal to the length of the modulated signal, or a guard interval in the received signal. A false detection peak occurs when the length and the modulation signal length are the same.
- FIG. 1 is a schematic diagram of time domain symbols of a first three-segment structure in an embodiment of the present invention
- FIG. 2 is a schematic diagram of a time domain symbol of a second three-segment structure in an embodiment of the present invention
- FIG. 3 is a schematic diagram of an acquisition process of a time domain symbol based on a first three-segment structure in an embodiment of the present invention
- FIG. 4 is a schematic diagram of an acquisition process of a time domain symbol based on a second three-segment structure in an embodiment of the present invention
- FIG. 5 is a schematic structural view of a first three-segment structure and a second three-segment structure spliced by the first splicing method in the embodiment of the present invention
- FIG. 6 is a schematic structural view of a first three-segment structure and a second three-segment structure spliced by a second splicing method according to an embodiment of the present invention
- FIG. 7 is a schematic diagram of an acquisition process based on a first splicing method in an embodiment of the present invention.
- FIG. 8 is a schematic diagram of an acquisition process based on a second splicing method in an embodiment of the present invention.
- FIG. 9 is a schematic diagram showing an arrangement of a frequency domain structure according to a first predetermined staggered arrangement rule in an embodiment of the present invention.
- FIG. 10 is a schematic diagram showing an arrangement of a frequency domain structure according to a second predetermined staggered arrangement rule in an embodiment of the present invention.
- FIG. 11 is a schematic diagram of relative overall shifting with a first shift value according to a third predetermined association rule in an embodiment of the present invention.
- FIG. 12 is a schematic diagram of relative overall shifting with a second shift value according to a third predetermined association rule in an embodiment of the present invention.
- FIG. 13 is a schematic diagram showing the arrangement of a frequency domain structure 2 corresponding to a time domain symbol in the embodiment of the present invention.
- FIG. 14 is a logic diagram of a correlation result to be detected corresponding to a three-segment structure CAB in a method for receiving a preamble symbol in an embodiment of the present invention.
- FIG. 15 is a logic diagram of a correlation result to be detected corresponding to a three-segment structure BCA in a method for receiving a preamble symbol in an embodiment of the present invention.
- 16 is a logic operation block diagram of obtaining a preliminary timing synchronization to be detected when the C-A-B-B-C-A splicing method is performed in the embodiment of the present invention
- 17 is a logic operation block diagram of obtaining a preliminary timing synchronization to be detected when the B-C-A-C-A-B splicing method is performed in the embodiment of the present invention
- 18 is a logic operation block diagram of obtaining preliminary timing synchronization results by using four sets of accumulated correlation values of four time domain symbols in an embodiment of the present invention
- 19 is a logic operation block diagram of obtaining preliminary timing synchronization results by using two sets of accumulated correlation values of two time domain symbols in an embodiment of the present invention
- 20 is a waveform diagram of an inverse Fourier result of a time domain body signal in AWGN in an embodiment of the present invention
- Figure 21 is a waveform diagram showing the inverse Fourier result of a time domain body signal in the embodiment under the channel of 0 dB two paths;
- Figure 22 (a) is a time domain body signal in the previous time domain symbol before the noise filtering process in the embodiment
- the inverse Fourier result is a waveform diagram of the channel with 0 dB two-path
- 22(b) is a waveform diagram of the inverse Fourier result of the time domain main signal in the time domain symbol before the noise filtering process in the embodiment, in the 0 dB two-path channel;
- Figure 23 (a) is a waveform diagram of the inverse Fourier result of the time domain main signal in the previous time domain symbol after the noise filtering process in the embodiment of the 0 dB two-path channel;
- 23(b) is a waveform diagram of the inverse Fourier result of the time domain main signal in the time domain symbol after the noise filtering process in the embodiment, in the 0 dB two-path channel;
- Figure 24 is a waveform diagram of the inverse Fourier result of a time domain body signal in Example 2 of the analytical signaling of the present invention at AWGN.
- a method for generating a preamble symbol includes the following steps:
- a preamble symbol is generated based on at least one time domain symbol.
- 1 is a schematic diagram of time domain symbols of a first three-segment structure in an embodiment of the present invention.
- 2 is a schematic diagram of time domain symbols of a second three-segment structure in an embodiment of the present invention.
- the time domain structure of the time domain symbols included in the above preamble symbols will be described below with reference to FIGS. 1 and 2.
- the time domain structure comprises a three-segment structure, which has two cases, a first three-segment structure and a second three-segment structure.
- the first three-segment structure is: a time domain body signal (part A), a prefix (part C) generated based on a partial time domain body signal intercepted from a time domain body signal, based on the portion A modulated signal (Part B) generated by part or all of the domain body signal.
- the second three-segment structure is: a time domain body signal (part A), a prefix (part C) generated based on a partial time domain body signal intercepted from the time domain body signal, according to the portion The super prefix generated by the domain body signal (Part B).
- a time domain body signal (indicated by A in the figure) is taken as the first part, and the last part of the first part is taken out according to a predetermined acquisition rule, processed according to the first predetermined processing rule and copied to the front part of the first part.
- the third part (marked by C in the figure) is used as a prefix, and at the same time, a part is taken out from the rear of the first part according to a predetermined acquisition rule, processed according to the second predetermined processing rule and copied to the back of the first part or Processing and copying to the front of the prefix to generate the second part (marked by B in the figure) to respectively correspond to the suffix or super prefix, thereby respectively generating the first three-segment structure with B as the suffix as shown in FIG. 1 ( The CAB structure) and B are super-prefixed as the second three-segment structure (BCA structure) as shown in FIG. 2.
- the first predetermined processing rule includes: direct copying; or multiplying each sampling signal in the extracted part by an identical fixed coefficient or Different coefficients are predetermined.
- the second predetermined processing rule includes: performing modulation processing when the first predetermined processing rule is a direct copy; or when the first predetermined processing rule is multiplying each of the sampled signals in the extracted portion by an identical fixed coefficient or a predetermined different coefficient The modulation process is performed after multiplying by the corresponding coefficient.
- the third part when the third part is a direct copy as a prefix, the second part is modulated and then used as a suffix or super prefix, and when the third part is multiplied by the corresponding coefficient, the second part also needs to be multiplied by the coefficient and Modulation processing is performed as a suffix or super prefix.
- FIG. 3 is a schematic diagram of an acquisition process of a time domain symbol based on a first three-segment structure in an embodiment of the present invention.
- the C segment is a direct copy of the A segment
- the B segment is a modulated signal segment of the A segment, as shown in FIG.
- the length of A is 1024
- the length of intercept C is 520
- the length of B is 504.
- each sample of the signal can be multiplied by a fixed coefficient. Or multiply each sample by a different coefficient.
- the data range of B does not exceed the data range of C, that is, the range of the portion A selected for the modulated signal segment B does not exceed the range of the portion A intercepted as the prefix C.
- the sum of the length of B and the length of C is the length of A.
- N A be the length of A
- Len C be the length of C
- Len B be the length of the modulated signal segment B.
- the sampling point number of A be 0,1,...N A -1.
- N1 be the first sampling point number of the first part A corresponding to the starting point of the second part B of the modulated signal segment
- N2 is the selective copying modulation.
- the second sample point number of the first portion A corresponding to the end point of the second portion B of the signal segment.
- the first sample point sequence number and the second sample point sequence number satisfy the following predetermined constraint relationship:
- the modulation performed on the second part B segment is a modulation frequency offset, that is, multiplied by a frequency shift sequence, a modulated M sequence or other sequences, etc.
- the modulation frequency offset is taken as an example, and P1_A(t) is A.
- the time domain expression, then the time domain expression of the first CAB three-segment structure is
- the frequency shift sequence can be arbitrarily selected as the initial phase. In order to make the correlation peak sharp, f SH can also be selected as 1/(Len B T).
- the autocorrelation delay of the CA segment containing the same content is N A
- the autocorrelation delay of the CB segment containing the same content is N A +Len B
- the autocorrelation delay of the AB segment containing the same content is Len B .
- the length of the C segment is exactly the same as the B segment, that is, the B segment can be regarded as a complete adjustment frequency offset segment of the C segment.
- a cyclic prefix C is spliced at the front of the time domain OFDM symbol A as a guard interval
- the modulated signal segment B is spliced at the rear of the OFDM symbol as a modulation frequency offset sequence to generate a first type
- FIG. 4 is a schematic diagram of a time domain symbol acquisition process based on a second three-segment structure in an embodiment of the present invention.
- the time domain expression of the second three-segment structure time domain symbol is, note that in order to make the receiving end processing method as consistent as possible, in the BCA structure, the modulation frequency offset value is exactly opposite to the CAB structure, and modulation The frequency offset sequence can be arbitrarily selected as the initial phase.
- the autocorrelation delay of the CA segment containing the same content is N A
- the autocorrelation delay of the BC segment containing the same content is Len B
- the autocorrelation delay of the BA segment containing the same content is N A +Len B .
- the current pilot symbol includes a symbol of a three-segment structure, whether it includes the first three-segment structure or the second three-segment structure, based on the same OFDM symbol body, the following method may also be adopted.
- the domain structure transmits signaling.
- Signaling is transmitted using different starting points of the second portion selected from the first portion, such as emergency broadcasts, hook information, transmitter flag information, or other transmission parameters.
- the predetermined length is 1024
- Len C is 512
- Len B is 256.
- N1 can take 512+i*160 ⁇ i ⁇ 16, which can represent 16 different methods and transmit 4bit signaling parameters.
- Different transmitters can transmit the corresponding identifier of the transmitter by taking different N1, the same transmitter can also transmit the transmission parameter by changing N1 in a time-sharing manner.
- the emergency broadcast identity EAS_flag is transmitted using 1-bit signaling.
- N1 512-L, that is, the corresponding number of the OFDM symbol with N A is 1024 is 512-L ⁇ 1023-2L, and the frequency offset sequence is modulated to generate B, which is placed at the back of A. .
- N1 512+L, that is, the corresponding number of the OFDM symbol with N A is 1024 is 512+L ⁇ 1023 and modulate the frequency offset sequence to generate B, and put it to the back of A.
- N A 1024
- Len C is 520
- Len B is 504
- a different three-segment structure may be used to identify the emergency broadcast.
- the preamble symbol may also comprise a splicing of time domain symbols of two three-segment structures.
- the three-segment structure of the two time-domain symbols is the same, the two three-segment symbols are directly spliced; for two different three-segment structures, there are two splicing methods in different order.
- the splicing of two different three-segment structures has the following advantages: when a multi-path so-called dangerous multipath with a special delay is generated, the rear portion of the front A segment may be exactly offset by the C segment whose rear diameter is exactly the same as A. The timing synchronization performance is degraded, and even more serious is that the small bias estimation cannot work. At this time, two different three-segment structures are used for splicing, and even when dangerous multipath occurs, the small deviation can be estimated normally.
- the preamble symbol includes a plurality of free time combinations of time domain symbols having the first three-segment structure and/or a plurality of time domain symbols having the second three-segment structure.
- two three-segment structures are taken as an example, and the two three-segment structures adopt a first three-segment structure and a second three-segment structure, respectively.
- Fig. 5 is a schematic view showing the first two-stage three-segment structure splicing method in the embodiment.
- Fig. 6 is a schematic view showing a second two-stage structure splicing method in the embodiment.
- the two time domain main signals are different, and the three-segment structure adopted is also different, and is formed by different sequential ordering of two time domain symbols.
- the first splicing method in FIG. 5 and the second splicing method in FIG. 5 are different, and the three-segment structure adopted is also different, and is formed by different sequential ordering of two time domain symbols.
- the time domain body signals (ie, A) of the two time domain symbols in FIG. 5 and FIG. 6 may be different, so that the capacity of the transmission signaling after the two symbols are spliced is a single three-segment structure time domain symbol. Twice or nearly twice.
- at least one time domain symbol included in the preamble symbol The time domain body signals may be different or the same.
- the detection of the time domain symbols of a single three-segment structure utilizes the delay autocorrelation of the CB segment, the CA segment and the BA segment to obtain the peak value, in the case of using two three-segment structure time domain symbol splicing, in order to make the two three-segment structure time domain symbols
- the autocorrelation values can be added to obtain more robust performance, and the parameter N1 of each of the two three-segment structure time domain symbols (ie, N1 is the sampling point number of A corresponding to the start of the modulation signal segment B) needs to be satisfied.
- N1 of the first symbol be N1_1
- N1 of the second symbol be N1_2
- it is necessary to satisfy N1_1+N1_2 2N A -(Len B +Len c ).
- the modulation used for the B segment is the modulation frequency offset, the frequency offset value is exactly the opposite.
- the time domain expressions of the spliced time domain symbols including the first three-segment structure and the second three-segment structure of the first connection according to the first splicing method are:
- the spliced time domain expressions of the second three-segment structure including the sequentially connected and the time domain symbols of the first three-segment structure according to the second splicing method are:
- N A 1024
- FIG. 7 is a schematic diagram of an acquisition process based on a first splicing method in an embodiment of the present invention.
- FIG. 8 is a schematic diagram of acquisition processing based on a second splicing method in an embodiment of the present invention.
- the two three-segment structures shown in FIG. 7 and FIG. 8 respectively adopt the first three-segment structure (CAB) and the second three-segment.
- the structure (BCA) can also be transmitted from the first part (Part A) by selecting different starting points of the second part (Part B, as a suffix or a super prefix) according to the time domain symbols of each three-segment structure. Signaling.
- the selection starting point N1_1 of the first three-segment structure time domain symbol and the selection starting point N1_2 of the second three-segment structure time domain symbol satisfy a certain constraint relationship.
- N1_1+N1_2 2N A -(Len B +Len c ) (Equation 13)
- the emergency broadcast identity EAS_flag is transmitted using 1-bit signaling. Combine the following Table 1 with specific expressions.
- Table 1 Corresponding table of the selection starting point of the emergency broadcast identifier and the suffix or super prefix under the predetermined time domain body signal length
- the emergency broadcast can also be identified by different ordering of the two time-domain symbols.
- two symbols can be spliced.
- the system When based on the first splicing method, the system is transmitting a general broadcast service; when based on the second splicing method. , indicating that the system is sending emergency broadcast services. It can also be based on the first splicing method, indicating that the system is transmitting the emergency broadcast service, and based on the second splicing method, indicating that the system is transmitting the general broadcast service.
- the preamble symbol or bootstrap may include only CAB or BCA, or may be several CABs or several BCAs, or may be any free combination of a number of CABs and an unlimited number of BCAs. It should be particularly noted that the preamble symbol or bootstrap of the present invention is not limited to a structure including only C-A-B or B-C-A, and may also include other time domain structures, such as a conventional CP structure.
- the current pilot symbol contains at least two three-segment time domain symbols, it usually includes at least one set of C-A-B structures and a cascade of B-C-A structures.
- the number of at least one time domain symbol included in the preamble symbol is set to transmit four symbols, and several more preferred four time domain symbol structures are given below, which are sequentially arranged in any one of the following structures. :
- the structure of four time-domain symbols such as C-A-B, B-C-A, C-A-B, and B-C-A maximizes the effect of cascading.
- the structure of four time-domain symbols such as C-A-B, B-C-A, B-C-A, and B-C-A, which lengthens the guard interval of the subsequent symbol A portion, and usually the first symbol is a known signal, so C-A-B is used.
- time domain symbols It is not limited to four time domain symbols.
- the first time domain symbol is a C-A-B three-segment structure, and the latter three-segment structure is all a specific embodiment of the sequentially connected B-C-A. It is assumed that the total number of the first or second three-segment structures included in the preamble or bootstrap is M time-domain symbols.
- the present invention also provides a method for generating frequency domain symbols, which are respectively used by a frequency domain OFDM symbol having a frequency domain structure 1 described below and a frequency domain OFDM symbol having a frequency domain structure 2 described below.
- the generation method is explained.
- the time domain main signal (Part A) is inversely Fourier transformed by the frequency domain OFDM symbol. Obtained by forming a time domain OFDM symbol.
- the frequency domain symbols provided by the present invention The generation method is not limited to the use of only the symbols of the three-segment structure shown in FIGS. 1 to 8 in the time domain, and may be applied to symbols of other arbitrary time domain structures.
- P1_X be the corresponding frequency domain OFDM symbol
- P1_X i be the inverse discrete Fourier transform to obtain the time domain OFDM symbol
- M is the power sum of valid non-zero subcarriers.
- the frequency domain structure of the first type of P1_X is described, which is defined as the frequency domain structure one.
- the method for generating the frequency domain symbols includes the following steps:
- the fixed sequence and the signaling sequence are arranged and padded to a valid subcarrier for forming a frequency domain symbol.
- the P1_X frequency domain structure that is, the frequency domain OFDM symbols respectively include a virtual subcarrier, a signaling sequence (referred to as SC) subcarrier, and a fixed sequence (referred to as FC) subcarrier.
- SC signaling sequence
- FC fixed sequence
- the predetermined staggered rule includes any of the following two rules:
- a first predetermined interleaving rule arranged in a parity interleave or an even odd interleave;
- the second predetermined interleaving rule placing a part of the signaling sequence on the odd subcarriers, another part of the signaling sequence on the even subcarriers, and placing a part of the fixed sequence on the odd subcarriers, and another part of the fixed sequence on the even subcarriers.
- the first predetermined interleaving rule is SC and FC parity interleaving or even odd interleaving emissions, such that FC As the pilot rule emission; the second predetermined interleaving rule requires that some SC sequences be placed on odd subcarriers, and the remaining SC sequences are placed on even subcarriers; at the same time, some FC sequences need to be placed on odd subcarriers, and the remaining FC sequences are placed. In even subcarriers, this avoids FC or SC being placed on odd or even subcarriers, all of which will fade out under certain special multipaths, and such emissions will increase the negligible complexity of channel estimation, so it is more Excellent choice.
- FIG. 9 is a schematic diagram showing the arrangement of signaling sequence subcarriers, fixed sequence subcarriers, and virtual subcarriers according to a first predetermined interleaving rule in an embodiment of the present invention.
- the step includes: filling a certain zero sequence subcarriers on both sides of the effective subcarriers to form a frequency domain OFDM symbol of a predetermined length.
- the length N A of the time domain body signal A in the time domain structure described above is 1024, and the length formed by the Fourier transform FFT in the frequency domain is N FFT of 1024.
- the N FFT has a predetermined length of 1024
- the two sides are padded with (1024-LP)/2 zero sequence subcarriers.
- the (11) fixed sequence generating step the fixed sequence is composed of 353 complex numbers whose modulus is constant, and the nth value of the fixed sequence subcarrier is expressed as:
- R is the power ratio of FC and SC
- SC i mode is constant to 1
- the radians value ⁇ n of the fixed sequence subcarriers is determined by the first predetermined fixed subcarrier radians value table in Table 2 below;
- the (12) signaling sequence generating step includes two types, that is, the following first signaling sequence generating manner and the second signaling sequence generating manner.
- the signaling sequence generated in the frequency domain may adopt any one of the following two manners. The specific manner of generating the signaling sequence is described in detail below.
- the first signaling sequence is generated:
- the root value is chosen to be the length of the signaling sequence.
- the sequence length L For example, determine the sequence length L and the number of signaling. For example, to transmit N bits, the signaling number num is 2N and the root value of exp(j ⁇ qn(n+1)/root) in the CAZAC sequence generation formula is selected.
- the sequence length L is less than or equal to the root value, and the root value is greater than or equal to 2*num.
- the root value is a prime number.
- k is the number of bits of the cyclic shift.
- the selected q i (0 ⁇ i ⁇ num-1) must satisfy the following conditions: any two q i , q j (0 ⁇ i , j ⁇ num-1) Meet q i +q j ⁇ root.
- each of the num sequences is truncated as a contiguous partial sequence or a full sequence of length L as a signaling sequence.
- the value of q ranges from 1 to 352, and the number of cyclic shift bits per sequence ranges from 1 to 353.
- the following 128 groups are preferred, the q value and the cyclic shift bits are as shown in the q value value table of Table 3 and the cyclic shift bit table of Table 4, respectively:
- the second signaling sequence is generated in the following way:
- the root value is chosen to be the length of the signaling sequence.
- the sequence length L determines the sequence length L and the number of signaling. For example, to transmit N bits, the number of signaling num is 2N, and select some K root k (0 ⁇ k ⁇ K-1) of exp(j ⁇ qn(n+1)/root) in the CAZAC sequence generation formula. .
- the signaling sequence length L is less than or equal to the minimum value of all root k , and the sum of several root k is greater than or equal to 2*num, that is, Usually root k is a prime number.
- the selected q i (0 ⁇ i ⁇ num k -1) must satisfy the following conditions: Any two q i , q j (0 ⁇ i , j ⁇ num k - 1) Satisfy q i +q j ⁇ root k .
- each of the num sequences is cyclically truncated into a contiguous partial sequence of length L or all sequences as a signaling sequence.
- each sequence is cyclically intercepted by length 353.
- the step generated by the (12)th signaling sequence generates a total of 512 signaling sequences, that is, Seq 0 , Seq 1 , . . . Seq 511 , and each signaling sequence Seq 0 ⁇ Seq according to the second signaling sequence generation manner.
- 511 further takes the opposite number, that is, -Seq 0 to -Seq 511 , and the receiving end uses the positive and negative of the correlation value to distinguish whether it is a positive sequence or an inverse sequence, that is, a total of 10 bits of signaling information is transmitted
- 512 signaling sequences can be further divided into 4 groups, each group of 128 signaling sequences, each group of 128 signaling sequence generation sub-steps are as follows:
- Sub-step 1 Generating a reference sequence zc i (n), which is a Zadoff-Chu sequence zc(n) of length N:
- Sub-step 2 Producing a length of 2N by copying zc i (n) twice :
- Step 3 From A particular starting position k i intercepts a sequence of length 353, yielding SC i (n):
- the N values, u i and shift values k i of each set of signalling sequences Seq 0 to Seq 127 are respectively determined by respective respective Tables 5 to 8 predetermined signaling sequence parameter tables.
- the N values of the first set of sequences Seq 0 to Seq 127 , u i and the shift value k i are as shown in Table 5 below.
- the steps of generating the second set of sequences Seq 128 to Seq 255 are the same as those of the first set of sequences, and the N values, u i and shift values k i are as shown in Table 6 below.
- the steps of generating the third set of sequences Seq 256 to Seq 383 are the same as those of the first set of sequences, and the N values, u i and shift values k i are as shown in Table 7 below.
- the generation steps of the fourth set of sequences Seq 384 to Seq 511 are the same as those of the first set of sequences, and the N values, u i and shift values k i are shown in Table 8 below.
- FIG. 10 is a schematic diagram showing the arrangement of signaling sequence subcarriers, fixed sequence subcarriers, and virtual subcarriers according to a second predetermined interleaving rule in the embodiment of the present invention.
- the signaling sequence of the first half of the figure on the left side of the dotted line is placed on the odd subcarriers, and the signaling sequence of the other half of the right side of the dotted line is placed on the even subcarriers, and is located on the left side of the dotted line.
- the first half of the fixed sequence is placed on the even subcarriers, and the latter part of the fixed sequence on the right side of the dotted line is placed on the odd subcarriers. That is, P1_X 0 , P1_X 1 , . . . , P1_X 1023 are generated according to the second predetermined interleaving rule.
- the odd carrier In the first half of the SC, the odd carrier is placed, the FC is put into the even carrier, and the second half of the SC is placed in the even carrier, and the FC is placed in the odd carrier.
- the signaling sequence, the parity of the fixed sequence is exchanged.
- Fixed sequence subcarrier Signaling sequence subcarrier The parity positions are interchangeable and have no effect on transmission performance.
- the lengths of the zero-sequence sub-carriers filled in the left and right sides may also be different, but it is not suitable for too much difference.
- the frequency domain OFDM symbol generated according to the second predetermined interleaving rule includes the following steps:
- a (21) fixed sequence generating step wherein the fixed sequence generating step is the same as in the (11) fixed sequence generating step, and only the fixed sequence subcarrier radians value ⁇ n is obtained by using a second predetermined fixed subcarrier radians value table. Determined; wherein the second predetermined fixed subcarrier radians value table is as shown in Table 9 below:
- Table 9 fixed subcarrier radians value table (according to the second predetermined staggered arrangement rule)
- the signaling sequence and the fixed sequence obtained by the (21) step and the (22) step are alternately arranged in a parity and even odd-even manner, and after zero-carriers are filled on the left and right sides, the frequency is formed according to the following formula. Domain OFDM symbol,
- a frequency-domain OFDM symbol generating step of a structure of time-domain OFDM symbols of two time-domain body signals includes the steps of generating any of the above-mentioned signaling sequences or
- the frequency domain OFDM symbol structure corresponding to the time domain symbols of the two three-segment structures may also satisfy any of the following three predetermined associations. At least one of the rules:
- First predetermined association rule two time domain OFDM symbols each take the same set of signaling sequences. For example, if 10 bits are transmitted as described above for a single symbol, the total transmission capacity is 20 bits.
- a second predetermined association rule the fixed sequence of the second time domain OFDM symbol remains the same as the fixed sequence of the first time domain OFDM symbol.
- the effective subcarrier position including the fixed sequence and the signaling sequence in the second time domain OFDM symbol is a left shift or a right shift of the effective subcarrier position in the first time domain OFDM symbol, and is shifted
- the bit value is usually controlled in the range of 0-5.
- FIG. 11 and FIG. 12 are schematic diagrams showing relative frequency shifts of frequency domain symbols corresponding to two time domain body signals according to a third predetermined association rule with a first shift value and a second shift value, respectively.
- the first shift value in FIG. 11 is 1, and the second shift value in FIG. 12 is 2.
- a joint time domain symbol comprising a plurality of three-segment structures, taking two three-segment structures as an example, the time domain body signal A1 in the first three-segment structure and the time domain body signal in the second three-segment structure
- the preferred embodiment of the generation of the frequency domain symbols of A2 is as follows:
- the frequency domain symbol corresponding to the time domain main signal A1 of the first time domain symbol in the joint preamble symbol is identical to the frequency domain symbol in the ordinary preamble symbol generated by the second predetermined interleaving rule described above, FC and SC sequences And the frequency domain placement position and the padding zero carrier are exactly the same.
- the frequency domain symbol corresponding to the time domain main signal A2 of the second time domain symbol in the joint preamble symbol is the same as the FC and SC sequence of the ordinary preamble symbol generated according to the second predetermined interleaving rule described above, and the frequency corresponding to A2
- the effective subcarrier position of the domain symbol is that the frequency domain symbol corresponding to A1 is shifted left by one bit as a whole. which is
- the frequency domain structure of the second type of P1_X is described as being defined as the frequency domain structure 2.
- the method for generating the frequency domain symbols includes the following steps:
- the predetermined sequence generation rule includes any one or two of the following combinations:
- the predetermined processing rule includes: phase-modulating the pre-generated subcarriers processed based on the frequency domain subject sequence according to a predetermined frequency offset value.
- FIG. 13 is a schematic diagram showing the arrangement of a frequency domain structure 2 corresponding to a time domain symbol in a preamble symbol according to an embodiment of the present invention.
- the preamble symbol as described above includes at least one time domain symbol, and the frequency domain subcarrier corresponding to the time domain symbol is obtained based on the frequency domain subject sequence.
- the frequency domain subcarriers comprise predetermined sequence generation rules for generating a frequency domain subject sequence and/or predetermined processing rules for processing the frequency domain body sequences for generating frequency domain subcarriers.
- the generation process of the frequency domain main sequence is more flexible, and the reservation is
- the sequence generation rules comprise any one or two combinations of: generating based on different sequence generations; and/or generating the sequences based on the same sequence generation, and further cyclically shifting the generated sequences.
- the constant envelope zero autocorrelation sequence (CAZAC sequence) is used, that is, the different sequence generation formulas are obtained by assigning different root values of the same CAZAC sequence, or the same sequence generation formula may be passed. The same value is given to the CAZAC sequence.
- the frequency domain body sequence is generated based on one or more CAZAC sequences having a predetermined sequence length N ZC .
- the predetermined sequence length N ZC is not greater than the Fourier transform length N FFT of the time domain body signal.
- Processing the filling step of the frequency domain main sequence generally comprising: mapping the frequency domain main sequence into a positive frequency subcarrier and a negative frequency subcarrier with reference to a predetermined sequence length N ZC ; referring to a Fourier transform length N FFT at a positive frequency subcarrier And a predetermined number of virtual subcarriers and DC subcarriers are filled with the outer edge of the negative frequency subcarrier; and the obtained subcarrier is cyclically shifted to the left so that the zero subcarrier corresponds to the first position of the inverse Fourier transform.
- a frequency domain subject sequence (Zadoff-Chu, sequence, ZC) of N ZC length is generated, which is a kind of CAZAC sequence.
- N ZC can be equal to or less than N root , which can be generated by complete or truncation of a complete Zadoff-Chu sequence of a certain value. Then, it can be selected to modulate a PN sequence of the same length for the ZC sequence to obtain a ZC_M sequence, which will be ZC_M.
- the sequence is divided into two parts, the length of the left half is Map to the negative frequency portion, the right half is the length Map to the positive frequency portion, N ZC can choose a natural number, not more than the length of the A segment FFT; in addition, at the edge of the negative frequency, fill The number of zeros, while at the edge of the positive frequency, The number of zeros is the virtual subcarrier; therefore, the specific sequence is Zero, PN modulated ZC sequence, 1 DC subcarrier, PN-modulated ZC sequences and The zero sequence is composed; the number of valid subcarriers is N ZC +1.
- the generation process of the frequency domain main body sequence such as a sequence formula
- a plurality of different root values q may be selected, and for each sequence generated by the root value q, different cyclic shifts may be performed to obtain more sequences, and signaling may be transmitted by any one or two of the two methods.
- each of the 256 sequences can be 0-
- the signaling is mapped to a bit field, and the transmitted signaling may include a frame format parameter for indicating a physical frame and/or for indicating emergency broadcast content, wherein the frame format parameters are: frame number, frame length, subsequent signaling The bandwidth of the symbol, the bandwidth of the data area, the FFT size and guard interval length of the signaling symbols, the modulation and coding parameters of the signaling symbols, and so on.
- the cyclic shift in the above predetermined sequence generation rule may be performed before the PN sequence modulation of the ZC sequence, or after the PN sequence modulation, and for the frequency corresponding to each of the time domain body signals.
- the PN sequences of the PN modulation performed by the domain body sequence are the same or different.
- the physical frame structure includes a preamble symbol and a data region, wherein the preamble symbol can include: a physical layer format control portion PFC and a physical layer content control portion PCC.
- the time domain body signal of the first time domain symbol in the at least one time domain symbol corresponds to a frequency domain body sequence that is known in advance
- the frequency domain body sequence and the corresponding frequency offset value are not used for transmitting the signal.
- the physical layer format control part PFC in the subsequent time domain symbols transmits signaling.
- the frequency domain main sequence (ZC sequence) used in the last time domain OFDM symbol is 180 degrees out of phase with the frequency domain main sequence (ZC sequence) used in the first OFDM symbol, which is used to indicate the last time domain OFDM symbol of the PFC.
- the ZC sequence used in the first time domain OFDM symbol in the PFC is generally a root sequence with no cyclic shift of a certain length, and at this length, the ZC sequence has a set, so the present invention selects one of the sets.
- a sequence which may indicate a certain information, such as a version number or indicating a type or mode of traffic transmitted in the data frame; furthermore, utilizing the corresponding root value in the first time domain body signal and/or for performing PN modulation
- the initial phase transmission information of the PN sequence, the initial phase of the PN also has a certain signaling capability, such as indicating the version number.
- Each CAZAC sequence has a corresponding subsequence length L M , and a subsequence having a subsequence length L M is generated for each CAZAC sequence according to the above predetermined sequence generation rule, and the plurality of subsequences are spliced into a frequency domain having a predetermined sequence length N ZC .
- the subject sequence is a corresponding subsequence length L M , and a subsequence having a subsequence length L M is generated for each CAZAC sequence according to the above predetermined sequence generation rule, and the plurality of subsequences are spliced into a frequency domain having a predetermined sequence length N ZC .
- the M CAZAC sequences are composed, and the lengths of the M CAZAC sequences are respectively L 1 , L 2 , . . . L M , and are satisfied.
- the method for generating each CAZAC sequence is the same as the above, and only one step is added. After the M CAZAC sequences are generated, the sequence is spliced into a sequence of length N ZC , and the ZC_M can be selected after being modulated by the PN sequence, and then frequency domain interleaving is performed.
- N ZC can choose a natural number, not more than the length of the A segment FFT; in addition, at the edge of the negative frequency, make up The number of zeros, while at the edge of the positive frequency, The number of zeros is the virtual subcarrier; therefore, the specific sequence is Zero, PN-modulated ZC sequence, 1 DC subcarrier, PN-modulated ZC sequences and The zero sequence is composed, wherein the step of modulating the PN can also be performed after the frequency domain interleaving.
- the subcarrier position filling may also take other processing filling steps, which are not limited herein.
- the subcarriers filled by the above processing are cyclically shifted to the left, and after the first half and the second half of the spectrum are interchanged, similar to the fftshift in Matlab, the zero subcarrier is corresponding to the first position of the discrete inverse Fourier transform, and the predetermined position is obtained.
- Pre-generated subcarriers of frequency domain OFDM symbols of length N FFT are cyclically shifted to the left, and after the first half and the second half of the spectrum are interchanged, similar to the fftshift in Matlab, the zero subcarrier is corresponding to the first position of the discrete inverse Fourier transform, and the predetermined position is obtained.
- a predetermined processing rule for processing the frequency domain body sequence to generate frequency domain subcarriers may be more preferably used.
- the present invention does not limit the use of any one or both of the predetermined processing rule and the predetermined sequence generation rule to form a frequency domain subcarrier.
- the predetermined processing rule includes: phase-modulating the pre-generated subcarriers according to the frequency offset value S, wherein the pre-generated subcarriers are obtained by performing the steps of processing and filling the frequency domain main body sequence, and shifting the left direction.
- the frequency domain subcarrier corresponding to the same time domain main signal A uses the same frequency offset value S to phase modulate each valid subcarrier in the frequency domain subcarrier, and the corresponding time domain main signal A corresponds to The frequency domain subcarriers use different frequency offset values S.
- the subcarrier expression of the original OFDM symbol is set to:
- Equation 35 The expression for phase modulation of each subcarrier by a certain frequency offset value such as s is as follows:
- the frequency offset value s can be selected as an integer of [-(N FFT -1), +(N FFT -1)], and the frequency offset value s is determined based on the Fourier transform length N FFT of the time domain main signal. Different values can be used to transmit signaling.
- the above implementation method for phase-modulating each pre-generated subcarrier by frequency offset value S can also be implemented in the time domain. Equivalent to: the original unmodulated phase of the frequency domain OFDM symbol is obtained by IFFT transform to obtain the time domain ODFM symbol, and the time domain OFDM symbol can be cyclically shifted to generate the time domain main body signal A, which is transmitted through different cyclic shift values. Signaling. In the present invention, description is made by phase-modulating each effective subcarrier by a certain frequency offset value in the frequency domain, and an obvious time domain phase equivalent operation method is also within the present invention.
- the foregoing embodiment may perform the foregoing predetermined sequence generation rule (1a) and the predetermined sequence generation rule (1b) and the predetermined processing rule (2) based on the frequency domain body sequence selection. Any one or at least two free combinations.
- a method of generating a preamble symbol of a predetermined sequence generation rule (1a) is used to transmit signaling.
- a method of generating a preamble symbol of a predetermined sequence generation rule (1a) and a predetermined process rule (2) is used to transmit signaling.
- the present invention does not limit the left shift or the right shift of the cyclic shift.
- the corresponding time domain loop shifts to the left, for example, the value is 8, corresponding to the time domain loop left shift 8; when s is negative
- the value is -8, corresponding to the time domain loop right shift 8.
- the method for transmitting the frequency domain modulated frequency offset value real-time domain shift value signaling is not limited, that is, the method includes directly transmitting the signaling by using the current symbol absolute shift value, and also includes Signalling is transmitted by the difference between the shift values of the preceding and succeeding symbols.
- the signaling analysis of the two methods can be performed by one of them. It is obvious to introduce another one.
- the correspondence between the signaling and the shift value is not limited, and the originating end can be freely set, and the receiving end can be reversely pushed according to the predetermined rule.
- the signaling using the absolute value of the shift value of each symbol is as follows: for example, there are 4 symbols in total, wherein the first symbol does not transmit signaling, and the signaling values to be transmitted of the second to fourth symbols are respectively S1, S2, S3. Assuming that the shift value is 4 times the value of the signaling, the shift value of the second symbol is 4S1, the shift value of the second symbol is 4S2, and the shift value of the third symbol is 4S3;
- the signaling values of the difference values of the preceding and following symbols are as follows: for example, there are 4 PFC symbols in total, wherein the first symbol does not transmit signaling, and the signaling values to be transmitted of the second to fourth symbols are respectively S1. , S2, S3.
- the shift value of the second symbol is 4S1
- the shift value of the second symbol is 4 (S1+S2)
- the shift of the third symbol The value is 4 (S1+S2+S3).
- a method for receiving a preamble symbol is also provided, and the method for receiving the preamble symbol is applicable to a preamble symbol generated by a sending end by using a predetermined generation rule.
- the generated preamble symbol includes all the technical elements related to the first three-segment structure and/or the second three-segment structure as explained above from the time domain angle as in the present embodiment. And/or including all of the technical elements, such as the frequency domain structure and the frequency domain structure, as described above in the frequency domain, as described in the present embodiment, and are not repeated here, and thus, in brief, applicable
- the predetermined generation rule generally includes the above-described method for generating a preamble symbol explained from a time domain angle and a method for generating a frequency domain symbol explained from a frequency domain angle without loss of generality.
- the preamble symbols generated for the predetermined generation rule respectively satisfy the time domain symbols having the above three-segment structure, the frequency domain symbols corresponding to the frequency domain structure one, and the frequency domain symbols having the frequency domain structure two, respectively.
- a description of the method of receiving the preamble symbol is performed.
- This embodiment provides a method for receiving a preamble symbol, including the following steps:
- Step S11 processing the received signal
- Step S12 determining whether there is a preamble symbol including the three-segment structure that is expected to be received in the processed signal;
- Step S13 If the result of the foregoing determination is yes, determine the location of the preamble symbol and solve the signaling information carried by the preamble symbol.
- the received preamble symbol includes at least one time domain symbol generated by the transmitting end to be freely combined according to a predetermined generation rule according to any number of the first three-segment structure and/or the second three-segment structure.
- the first three-segment structure as described above includes a time domain body signal, a prefix generated based on all or part of the time domain body signal, and a suffix generated based on all or part of the partial time domain body signal.
- the second three-segment structure as described above includes a time domain body signal, a prefix generated based on all or part of the time domain body signal, and a super prefix generated based on all or part of the partial time domain body signal.
- the received physical frame signal is processed to obtain a baseband signal as described in step S11.
- the signal received by the receiving end is an analog signal, so it needs to be analog-to-digital converted to obtain a digital signal, and then subjected to filtering, downsampling, etc. to obtain a baseband signal.
- the receiving end receives the intermediate frequency signal, it needs to perform spectrum shifting after the analog-to-digital conversion processing, and then performs filtering, downsampling and the like to obtain a baseband signal.
- step S12 it is determined whether there is a preamble symbol including the three-segment structure that is desired to be received in the baseband signal.
- the receiving end determines whether there is a preamble symbol that is expected to be received in the received baseband signal, that is, whether the received signal meets the receiving standard. For example, if the receiving end needs to receive data of the DVB_T2 standard, it is necessary to determine the received data. Whether the signal contains the leading symbol of the DVB_T2 standard, similarly, it is necessary to judge whether the received signal contains the time domain symbol of the CAB and/or BCA three-segment structure.
- the above steps S12 and S13 include any at least one of the following steps: initial timing synchronization, integer multiple frequency offset estimation, precise timing synchronization, channel estimation, decoding analysis, and fractional multiple frequency offset estimation.
- the reliability judgment may be freely combined by using any one of the following methods or any two at least two ways, that is, determining whether there is a preamble symbol that is expected to be received in the processed signal: an initial timing synchronization manner, an integer multiple frequency offset estimation manner, and an accurate timing Synchronization method, channel estimation method, decoding result analysis method and fractional multiple frequency offset estimation method.
- the step S12 includes an S12-1 initial timing synchronization mode for initially determining the position of the preamble symbol in the physical frame, and further comprising: S12-2 determining, according to a result of the initial timing synchronization manner, whether the baseband signal is expected to be received. Contains the leading symbols of the three-segment structure.
- the initial timing synchronization mode may take the following initial synchronization by any one or both of the following (1) initial timing synchronization method and (2) initial timing synchronization mode.
- the (1) initial timing synchronization method includes the following steps:
- the basic accumulated correlation values are grouped according to different delay lengths of the delay sliding autocorrelation, and each group performs at least one symbol according to a specific splicing relationship of at least two time domain symbols.
- mathematical operations are performed to obtain a final accumulated correlation value of a certain delay length, and when there is only one time domain symbol of the three-segment structure, the final accumulated correlation value is the basic accumulation.
- the operational values are used for initial timing synchronization after delay relationship matching and/or a particular predetermined mathematical operation based on at least one of the final accumulated correlation values.
- performing one or two or more inter-symbol delay relationship matching and/or phase adjustment includes that performing an inter-symbol delay relationship matching and/or phase adjustment is equivalent to performing two or more without any operation.
- Inter-symbol delay relationship matching and/or phase adjustment include actual operation Work.
- the necessary inverse processing and/or signal solution is performed on the baseband signal.
- three accumulative correlations between the third portion C and the first portion A, the first portion A and the second portion B, and the third portion C and the second portion B in the three-segment structure are obtained.
- the value is any one of U ca '(n), U cb '(n), U ab '(n) or any at least two.
- a correlation value to be detected is obtained based on at least one of the above-described accumulated correlation values.
- the three-segment structure is a C-A-B structure.
- the received signal is subjected to a delayed sliding autocorrelation, and the delay correlation expression Uca (n) and the delay-related accumulated value Uca '(n) are as follows:
- the received signal is subjected to delay sliding autocorrelation and demodulation frequency offset, paying attention to the delay correlation expression U cb (n) and the delay correlation accumulated value U cb '(n) is as follows:
- the received signal is subjected to delay sliding correlation based on the processing relationship of the second portion B and the first portion A and the modulation frequency offset value, and the delay correlation expression U ab (n) and the delay correlation accumulated value U ab '(n) are as follows:
- corr_len can take 1/f SH T to avoid continuous wave interference or take Len B to make the peak sharp.
- the delay-related accumulated values U ca '(n), U cb '(n), U ab '(n) are used to perform the required delay matching and perform mathematical operations, the mathematical operations including multiplication or addition, such as U cb '(n ) ⁇ U ab ' * (n), or
- FIG. 14 is a logic diagram of a correlation result to be detected corresponding to a three-segment structure CAB in an embodiment of the present invention.
- C, A, and B in the figure represent the lengths of the C segment, the A segment and the B segment signal, respectively, and the moving average filter may be a power normalization filter.
- A is N A
- B is Len B
- C is Len C .
- the three-segment structure is a B-C-A structure.
- the received signal is subjected to a delayed sliding autocorrelation, and the delay correlation expression Uca (n) and the delay-related accumulated value Uca '(n) are as follows:
- the received signal is subjected to delay sliding autocorrelation and demodulation frequency offset, paying attention to the delay correlation expression U cb (n) and delay correlation accumulation.
- the value U cb '(n) is as follows:
- the received signal is subjected to delay sliding correlation based on the processing relationship of the second portion B segment and the first portion A segment and the modulation frequency offset value, and the delay correlation expression U ab (n) and the delay correlation accumulated value U ab '(n) as follows:
- corr_len can take 1/f SH T to avoid continuous wave interference or take Len B to make the peak sharp.
- Figure 15 is a logic diagram of the correlation result to be detected corresponding to the three-segment structure BCA in the embodiment of the present invention.
- a correlation value of the preliminary timing synchronization is formed based on the correlation result 1 to be detected and/or the correlation result 2 to be detected.
- the transmission preamble symbol includes the following two cases (a) and (b),
- the initial timing synchronization is completed by any one or a combination of the above (1) initial timing synchronization method and the following (2) initial timing synchronization method. Wherein, based on the two completions, the first preliminary synchronization operation value obtained in the (1) initial timing synchronization manner and the second preliminary synchronization operation value obtained in the (2) initial timing synchronization manner are further weighted, The weighted operation value completes the initial timing synchronization.
- the (2) initial timing synchronization method will be specifically described below.
- the (2) initial timing synchronization manner may be performed by using the time domain main body signal A Performing a difference operation according to the predetermined N difference values, and performing a difference operation on the time domain signals corresponding to the known information, and then performing cross correlation on the two to obtain a differential correlation result of the N sets and the N difference values one by one.
- Initial synchronization is performed based on the results of the N sets of differential correlations, and processed values are obtained for initially determining the position of the leading symbols, where N ⁇ 1.
- the baseband data is subjected to differential operation by differential value.
- the phase rotation caused by the carrier frequency offset becomes a fixed carrier phase e j2 ⁇ D ⁇ f , where ⁇ f represents the carrier frequency deviation.
- the local time domain sequence (such as the fixed subcarrier is filled according to the corresponding position and the remaining positions are 0 and then IFFT is obtained to obtain the corresponding time domain sequence)
- the correlation peak can be well given and the peak value is not affected by the carrier deviation.
- the frame synchronization/timing synchronization position is obtained by the following equation
- the differential correlation algorithm can resist the influence of any large carrier frequency offset, but the signal noise is enhanced due to the differential operation of the received sequence first, and the noise enhancement is very serious at low SNR. , causing the signal to noise ratio to deteriorate significantly.
- N the value of N is 64, and 64 sets of differential correlation are implemented.
- D(0), D(1), ..., D(N-1) are the selected N different difference values.
- any one of the following two may be adopted based on performance requirements of the transmission system:
- the difference value D(i) arbitrarily selects N different values and satisfies D(i) ⁇ L, where L is the length of the local time domain sequence corresponding to the known information.
- a predetermined processing operation is performed on the N results (64) to obtain a final correlation result.
- the predetermined processing operation herein, which are separately explained.
- the first predetermined processing operation is a predetermined processing operation
- the N different differential correlation results are subjected to predetermined processing operations by the following formula to obtain a final differential result.
- the following equation is an example in which absolute values are added to obtain a final differential result.
- the difference value selected according to this rule is obtained as After the difference correlation value, the adjacent two sets of differential correlation values are conjugate multiplied, and the conjugate multiplied by the N-1 group is obtained by the following formula.
- the obtained N-1 group RM i,m can be weighted vector addition. Or the average difference result is averaged to get better performance than the first predetermined processing operation.
- the following equation is an example of vector addition to obtain the final difference result.
- the conjugate multiplication value can be obtained not only in the second predetermined processing operation but also the weight vector addition or average.
- the final correlation result may also be obtained by adding or averaging the at least two differential correlation results directly by weighted absolute values in the first predetermined processing operation described above.
- the position within a certain range of the maximum value position of the correlation value of the initial timing synchronization can be utilized. To initially determine the position of the leading symbol in the physical frame. The value corresponding to the position is used to further determine whether the received preamble symbol is included in the received signal, or the subsequent positional estimation and/or decoding operation is performed by using the position to further receive whether the signal includes the desired preamble symbol.
- the detecting is performed based on a result of initial timing synchronization, and if the detected result satisfies a preset condition, determining that the baseband signal exists A preamble symbol containing a three-segment structure that is expected to be received.
- the satisfaction of the preset condition herein may mean that the result of the initial synchronization according to the initial timing itself satisfies the preset condition determination, and may also mean that the result of the synchronization according to the initial timing is not sufficient, and then according to other subsequent steps such as an integer multiple.
- the frequency offset estimation and/or decoding result is determined.
- the direct determination is based on the initial timing synchronization result
- the preset condition includes the initial timing synchronization result to perform a specific operation, and then it is determined whether the maximum value of the operation result exceeds the threshold threshold.
- the predetermined acquisition rule between the C-part, the A-part, and the B-part of the first three-segment structure and the second three-segment structure may be used.
- And/or predetermined processing rules obtaining two sets of delay-related accumulated values corresponding to two three-segment structures, three values per group, and generating two groups based on at least one of three delay-related accumulated values of each of the two groups The correlation result is detected, thereby detecting and judging whether the leading symbol contains a three-segment structure and which three-segment structure is included.
- the preamble symbol includes two three-segment structures at the same time.
- the initial timing synchronization resolves the emergency broadcast by any combination of any one or any of the following: the third part and the Different delay relationships of the same content between the two parts; and different delay relationships of the same content between the first part and the second part to distinguish between sending emergency broadcasts and ordinary broadcasts.
- the receiving end will implement a multi-branch step S12-1 included in the above step S12: an initial timing synchronization manner for initially determining the position of the preamble symbol in the physical frame; As a result, it is judged whether or not there is a preamble symbol desired to be received and the transmitted time domain signaling.
- the delayed sliding autocorrelation defining N1 of a certain value described above is one branch.
- Each branch contains the above three delay-related accumulated values.
- the receiving end simultaneously performs the above-mentioned delayed sliding autocorrelation branches of 2 Q different N1 values, and then from 2 Q U 2 '(n) ⁇ U 3 ' * (n) or U ca '(nN A +N1) ⁇ In the absolute value of U cb '(n) ⁇ U ab ' * (n), it is determined whether or not there is a desired leading symbol.
- any of the absolute values does not exceed the threshold threshold, then there is no signal expected to be received in the baseband signal.
- the received signal delays 1024 sample points and performs sliding autocorrelation with the received signal
- the received signal delays 1528 sample points and the received signal of the demodulated frequency offset is subjected to sliding autocorrelation
- the received signal delays 504 samples and performs sliding autocorrelation with the received signal after demodulation frequency offset
- the received signal delays 1024 sample points and performs sliding autocorrelation with the received signal after demodulation frequency offset
- the received signal delays 1544 sample points and the received signal of the demodulated frequency offset is subjected to sliding autocorrelation
- the received signal delays 520 sample points and performs a sliding autocorrelation with the received signal after the demodulation frequency offset.
- threshold threshold is used as a preset condition to determine whether or not there is a preamble symbol that is expected to be received
- the current pilot symbol contains only one of the first three-segment structure and the second three-segment structure to identify the non-emergency broadcast, and the other is used to identify the emergency broadcast, which is parsed by the following.
- Step S12-1 may obtain two corresponding three segments according to a predetermined acquisition rule and/or a predetermined processing rule between the C segment, the A segment, and the B segment of the first three-segment structure and the second three-segment structure.
- each branch has 3 values
- step S12-2 includes detecting the correlation value to be detected of each of the two branches.
- the fractional frequency offset estimation can also be performed by using the preliminary timing synchronization result of the (1) mode and/or the (2) mode.
- the second small offset value can be calculated, and then U cb '(n) and U ab '(n) are conjugated.
- the third small offset value can be calculated by taking the angle corresponding to the maximum value.
- the angles in the logic operation block diagrams in FIG. 14 and FIG. 15 are used to obtain the small partial deviation, and the small partial estimation can be performed based on the second small offset value and any one or two of the third small offset values.
- the transmission preamble symbol includes the features required by the (1)th preliminary timing synchronization mode and the (2) preliminary timing synchronization mode, based on any one of the first, second, and third small offset values or any at least The combination of two to get a small bias estimate.
- the preamble symbol of the transmitting end includes the three-segment structure of C-A-B and B-C-A
- the preamble symbol including at least one time domain symbol after being spliced in a certain splicing manner is used to determine whether the baseband signal is included in the signal.
- the (1) initial timing synchronization manner includes the following steps:
- Step S2-1A Performing corresponding corresponding reverse processing on the baseband signal according to a predetermined acquisition rule and/or a predetermined processing rule between the CAB structure and the C segment, the A segment, and the B segment of the BCA structure in the preamble symbol that is expected to be received.
- delay sliding autocorrelation is performed to obtain the basic delay-related accumulated value (for example, U 1,ca '(n), U 1,cb '(n), U 1,ab '(n) in the CABBCA structure , U 2,ca '(n), U 2,cb '(n), U 2,ab '(n).)
- Step S2-1B grouping the basic delay-related accumulated values of step S2-1A according to different delay lengths of the delayed sliding auto-correlation in the previous step (divided into three groups), each group being specified according to two time-domain symbols After the splicing relationship is further subjected to delay relationship matching and/or phase adjustment, a mathematical operation is performed to obtain a final accumulated correlation value corresponding to a delay length in the previous step, and a total accumulated correlation value of three different delay lengths is obtained;
- Step S2-1C Perform delay matching based on one, two or three of the three final accumulated correlation values and perform a mathematical operation to obtain a correlation value of the correlation value to be detected, that is, the initial timing synchronization.
- U 1,ca '(n), U 1,cb '(n) are obtained according to the above method.
- U 1,ab '(n), U 2,ca '(n), U 2,cb '(n), U 2,ab '(n) then U 1,ca '(n-(N A +2Len B +Len C )) and U 2,ca '(n) are added, since they are all obtained by a sliding autocorrelator with a delay length of N A , resulting in U A (n).
- U 1,cb '(n-(N A +2Len B )) and U 2,ab '(n) are added, since they are all obtained by a sliding autocorrelator with a delay length of N A +Len B , resulting in U A +B (n).
- U 1,ab '(n-(2Len B )) and U 2,cb '(n) are added, since they are all obtained by a sliding autocorrelator with a delay length of Len B , and U B (n) is obtained.
- FIG. 16 is a block diagram showing the logical operation of obtaining the preliminary timing synchronization to be detected under the CABBCA splicing method in the present embodiment.
- A is N A
- B is Len B
- C is Len C .
- a logic operation block diagram for obtaining preliminary timing synchronization to be detected under the BCACAB splicing method in the present embodiment is given by FIG.
- A is N A
- B is Len B
- C Len C .
- step S2-1A when the FC sequences of the two time domain symbols of the joint preamble symbol are the same, the delay correlation cumulative value of the combined splicing portion of the C+A segments of the two symbols before and after is also obtained; It can also be used in the mathematical calculation in step S2-1C, and then the correlation result to be detected is further obtained to further improve the detection performance.
- the (1) initial timing synchronization manner includes the following steps:
- step S2-1B the delay-dependent accumulated value of step S2-1A (actually the output of three delay sliding correlators, here defined as six for the representation), is defined as as well as (The first time domain symbol and the second time domain symbol are respectively delayed by N A +Len B , N A , and Len B.
- the delay relationship matching is performed according to a specific splicing relationship with these values having the same delay. And / or phase adjustment and then add or average, because there are two different splicing methods, so here also corresponds to the delay relationship between the two different symbols. Specifically, as well as
- the correlation results of the two branches are finally obtained, wherein if the first branch detection result satisfies the preset condition, Determining, in the baseband signal, that there is a joint preamble symbol of the three-segment structure that is expected to be received in the first splicing manner; if the second branch detection result is satisfied Predetermining conditions, determining that there is a joint preamble symbol of the three-segment structure spliced in the second splicing manner that is expected to be received in the baseband signal; if both groups are satisfied, it needs to be judged separately, for example, two The apparentity of the peak-to-noise ratio of the branch is judged.
- step S2-1A when the FC sequences of the two time domain symbols of the joint preamble symbol are the same, the delay correlation cumulative value of the combined splicing portion of the C+A segments of the two time domain symbols before and after is obtained.
- the delay-dependent accumulated value of the combined splicing portion of the C+A segments of the two preceding and last time domain symbols of the two branches can be obtained accordingly; in S2-1C
- the lieutenant can also use the values of the two branches for the mathematical calculation of the two branches, and then obtain the correlation results of the two branches to further improve the detection performance.
- the receiver can detect the preset condition by detecting the joint preamble symbol or by detecting a single three-segment structure.
- the detection result by the joint preamble symbol is significantly better than the detection result of a single three-segment structure, it can be determined that there is a preamble symbol containing a plurality of time domain symbols having a three-segment structure in the received signal.
- the presupposition condition may be determined by a single condition according to the preset condition to be detected, or may be determined according to the related result to be detected, and may be determined according to other subsequent steps such as integer multiple frequency offset.
- the estimation and/or decoding results are determined.
- the fractional frequency offset estimation may also be performed by using the preliminary timing synchronization result of the (1) preliminary timing synchronization mode and/or the (2) preliminary timing synchronization mode.
- the angle of the maximum value in U A (n) is taken, and the second small offset value can be calculated, and then U A+B ( n) multiplication with U B (nN A ) conjugate (corresponding to CABBCA cascading method) or U A+B (n) and U B (n) conjugate multiplication (corresponding to BCACAB cascading method)
- the angle corresponding to the value can be used to calculate the third small offset value.
- the angles in the logic operation block diagram 16 and FIG. 17 are used to obtain the small partial deviation, and the small partial estimation can be performed based on the second small offset value and any one of the third small offset values.
- One or more of the delay correlations and/or phase adjustments between the symbols are added or averaged to obtain the final U A (n). This is because they have the same phase value.
- Examples of delay matching are as follows:
- delay matching is performed and a specific operation is performed.
- the delay matching is as follows:
- the initial timing synchronization is completed based on the result of the operation, and the specific numerical operation can be an absolute value addition. For example, take the maximum position to complete the initial timing synchronization.
- the delay number may be adjusted within a certain range, for example, the delay number of some delay correlators should be increased or decreased by one.
- the three delays are added to and subtracted from each other, and then multiple delay sliding autocorrelations are performed according to the obtained adjusted multiple delays and the number of delays.
- the sliding delay autocorrelation is implemented according to the three delay numbers, and then the correlation is selected. The most obvious result is that the timing deviation can be estimated at the same time.
- FIG. 18 is a logic operation block diagram for obtaining preliminary timing synchronization results by using four sets of accumulated correlation values of four time domain symbols in the present embodiment; and FIG. 19 shows two groups using two time domain symbols in the present embodiment.
- the current pilot symbol has a structure with C-A-B or B-C-A, it also contains In other time domain characteristics, in addition to the timing synchronization method using the structural features of the above C-A-B or B-C-A, other timing synchronization methods implemented for other time domain structure features are superimposed without departing from the spirit of the present invention.
- the first one is the CAB structure, and the following is the first (1) preliminary timing synchronization manner of the K time-domain symbols of the BCA structure of the sequential connection.
- the starting point of the selected suffix or super prefix (part B) in the CAB structure corresponds to the first sampling point number N1_1 of the time domain main body signal A
- N A is 2048
- Len C is 520
- Len B 504
- N1_1 1544
- N1_2 1528
- f SH 1/(2048T) is taken as an example.
- the delay sliding autocorrelation obtains the accumulated correlation value formula as follows:
- the conjugate operation * in U 1 (n) can also be implemented by r(n), and r(nN A ) is not conjugated.
- each C-A-B or B-C-A three cumulative correlation values of CA, AB and CB based on the same content can be separately obtained.
- each CAB or BCA can get three correlation values: U ca '(n), U cb '(n), U cb '(n)
- the sliding delay correlation is performed using the same portion of the B segment and the A segment that only modulates the frequency offset:
- corr_len can take 1/f SH T to avoid continuous wave interference, or take Len B to make the peak sharp.
- three accumulated correlation values of CA, AB and CB can be obtained, that is, U ca '(n), U cb '(n), U Ab '(n), using any one or any of at least two of U ca '(n), U cb '(n), U ab '(n) to obtain an accumulated correlation value, performing a symbol or based on the accumulated correlation value
- a delay relationship match and/or a mathematical operation between a plurality of symbols yields a final operational value that is used for initial synchronization.
- the arrangement is CAB, BCA, BCA, BCA, ..., BCA.
- the first symbol is the CAB structure, and the subsequent K-1 are Is the BCA structure, get Actually the output of three delayed sliding autocorrelators,
- One or more of the delay relationship matching and/or phase adjustment according to the relationship between one symbol or a plurality of symbols are added or averaged to obtain the final U A (n). This is because they have the same phase value. When only one is taken, the actual delay relationship match and/or phase adjustment is equal to no operation.
- Delay matching and / or phase adjustment include all or part of the following, for example:
- N A is 2048
- Len C be 520
- Len B 504
- ie (N A +Len B +Len C ) 3072, so To make a phase adjustment, multiply by e j ⁇ .
- Delay matching includes all or part of the following, for example:
- N A is 2048
- Len C be 520
- Len B 504
- ie (N A +Len B +Len C ) 3072, so To make a phase adjustment, multiply by e j ⁇ .
- Delay matching includes all or part of the following, for example:
- N A is 2048
- Len C be 520
- Len B 504
- ie (N A +Len B +Len C ) 3072, so To multiply by e j ⁇ .
- delay matching is performed and a specific operation is performed.
- the delay matching includes all or part of the following, as follows:
- the initial timing synchronization is completed based on the result of the operation, and the specific numerical operation can be an absolute value addition. For example, take the maximum position to complete the initial timing synchronization.
- the step S12-2 includes an initial timing synchronization mode for initially determining the position of the preamble symbol in the physical frame. Further, after the initial synchronization, the integer multiple frequency offset estimation manner may also be performed based on the result obtained by the initial timing synchronization manner.
- the receiving end may further perform integer multiple frequency offset estimation by using the fixed sequence, that is, the receiving method of the preamble symbol of the present invention may further include the following integer multiple frequency offset estimation step:
- the first integer multiple frequency offset estimation method includes: intercepting a time domain signal including at least all or part of the time domain main signal according to the result of the initial timing synchronization, and using the frequency sweeping method to differentiate the intercepted time domain signal
- a plurality of N frequency-swept time domain signals corresponding to the frequency offset values are obtained, and the known time domain signals obtained by inverse Fourier transform of the known frequency domain sequence and each of the frequency sweep time domain signals are obtained.
- the maximum correlation peaks of the N cross-correlation results are compared, and the frequency offset value of the swept time domain signal corresponding to the largest cross-correlation result is an integer multiple frequency offset estimation value; and/or
- the second integer multiple frequency offset estimation method includes:
- the time domain signal of the length of the main body time domain signal is intercepted according to the result of the initial timing synchronization, and the obtained frequency domain subcarrier is cyclically shifted according to different shift values in the frequency sweeping range, and the effective subcarrier is intercepted.
- An integer multiple frequency offset estimation value is obtained by using the correspondence between the shift value and the integer multiple frequency offset estimation value.
- the time domain main signal A corresponds to the frequency domain structure one, that is, the frequency domain OFDM symbols respectively include a virtual subcarrier, a signaling sequence (referred to as SC) subcarrier, and a fixed sequence (referred to as FC) subcarrier three parts, the known frequency domain sequence mentioned below is a fixed subcarrier; for example, the time domain main body signal A has the above frequency domain structure 2, that is, the first time domain symbol of the preamble symbol is Known information, then the known frequency domain sequence mentioned below is the known information of the first time domain symbol.
- the first integer multiple frequency offset estimation method intercepts all or part of the time domain waveform of the received preamble symbol according to the position of the preamble symbol detected by the initial timing synchronization, and adopts a frequency sweep method, that is, a step of changing at a fixed frequency.
- the path for example, corresponding to the integer multiple frequency offset interval, after the partial time domain waveform is modulated with different frequency offsets, several time domain signals are obtained.
- T is the sampling period and f s is the sampling frequency.
- A2 will be known as the sliding correlation signal with each of A1 y, select occur that A1 y maximum correlation peak, then
- the frequency offset value y modulated by it is an integer multiple frequency offset estimation value.
- the sweep range corresponds to the frequency offset range that the system needs to combat.
- the frequency offset of positive and negative 500K is needed, and the system sampling rate is 9.14M, and the main body of the leading symbol is 2K length, then the sweep frequency range is That is [-114,114].
- the second integer multiple frequency offset estimation method intercepts the main time domain signal A according to the position of the preamble symbol detected by the initial timing synchronization, and performs FFT to perform different shift values of the frequency domain subcarrier after the FFT. Cyclic shift, and then intercept the received sequence corresponding to the effective subcarrier, perform some operation (usually conjugate multiplication, or division) with the received sequence and the known frequency domain sequence, and then perform the result IFFT, IFFT
- the result is a specific operation, such as taking the maximum diameter energy, or taking a number of large-path energy accumulations. Then a number of shift values, after several IFFTs, each time get an operation result, you will get several sets of operation results. Based on the results of the plurality of groups, it is determined which shift value corresponds to the integer multiple frequency offset estimation, thereby obtaining an integer multiple frequency offset estimation value.
- the usual judging method is to select the corresponding shift value of the group with the largest energy as the integer octave bias estimation value based on the results of several groups.
- the domain main signal A corresponds to the above-mentioned frequency domain structure
- the following generalized offset estimation method can also be adopted.
- the time domain main signal A of the corresponding symbol in the preamble symbol is subjected to Fourier transform to obtain a frequency domain OFDM symbol, and the transformed frequency domain OFDM symbol is cyclically shifted by the above-mentioned frequency sweep range, and the FC is on the subcarrier.
- the position and the interval between the two fixed-sequence sub-carriers are differentially multiplied by the interval, and the correlation is performed with the differential multiplication value of the known fixed-sequence sub-carriers to obtain a series of correlation values, and the maximum correlation value is selected. Cyclic shift, you can get the integer octave bias estimate.
- the time-domain main signal A of the two time-domain symbols may be subjected to Fourier transform.
- the frequency domain OFDM symbols, the transformed two frequency domain OFDM symbols are simultaneously subjected to the same cyclic shift of the above-mentioned frequency sweep range, and each shifted symbol received value is conjugated with the known fixed sequence subcarrier value of the symbol.
- R i,1,j is the received value at the corresponding FC position after the shift j in the first symbol frequency domain
- R i,2,j is the corresponding FC position in the frequency domain of the second symbol after shifting j Received value
- M is the total number of known FCs, so that a series of accumulated values corresponding to the cyclic shift values are obtained, and the maximum accumulated value is selected.
- Corresponding cyclic shifts can be obtained to obtain integer multiple frequency offset estimates.
- the frequency offset is compensated, and then the transmission signaling is analyzed.
- the precise timing synchronization mode is performed by using the known information in the preamble symbol.
- the fixed subcarrier sequence FC included in one or more frequency domain symbols is used to perform accurate timing synchronization
- the known signal is used to perform a precise timing synchronization manner.
- the step of determining the position of the preamble symbol in the physical frame and solving the signaling information carried by the preamble symbol is described in detail.
- the step includes the following:
- Determining the location of the preamble symbol includes determining a location of the preamble symbol in a physical frame based on a result of the detection that satisfies the preset condition;
- the position at which the preamble symbol appears is determined according to the portion of the value or the maximum value at which the peak value of the correlation value to be detected is large.
- the channel estimation method is also included in the step of parsing the transmission signaling.
- channel estimation can be performed by using the received signal containing a fixed sequence subcarrier and a known frequency domain fixed sequence subcarrier and/or its time domain signal corresponding to the inverse Fourier transform.
- the time domain is performed and/or performed in the frequency domain, and details are not described herein again.
- the channel estimation method includes: after decoding the last time domain main body signal, using the obtained decoding information as the transmission information, performing channel estimation again in the time domain/frequency domain, and performing some sort of channel estimation result with the previous channel.
- a specific operation results in a new channel estimation result for channel estimation of the signaling analysis of the next time domain subject signal.
- the position of the subsequent signaling symbol or the position of the data symbol may be obtained according to the parameter content and the determined position of the preamble symbol and based on this Parsing signaling symbols or data symbols.
- the step of parsing the signaling signal includes: using all or part of the time domain waveform of the preamble symbol and/or all of the preamble symbol Or the frequency domain signal obtained by the Fourier transform of the partial time domain waveform to solve the signaling information carried by the preamble symbol.
- the signaling sequence subcarrier set is generated based on a known set of signaling sequences.
- the signal including the signaling sequence subcarrier includes: all or part of the time domain waveform of the received preamble symbol, or one or more main body OFDM symbols are extracted from the preamble symbol by Fourier transform. One or more frequency domain OFDM symbols obtained afterwards.
- the signaling sequence subcarrier set is a set formed by filling each signaling sequence in the signaling sequence set onto the effective subcarrier.
- one or more frequency domain OFDM symbols obtained by performing Fourier transform on the time domain signals of the N A length corresponding to the ODFM symbol body are intercepted; then, the zero carrier is removed, and the carrier position is removed according to the signaling subcarrier position.
- the frequency domain decoding function is completed by performing specific mathematical operations on the channel estimation values and the known signaling sequence subcarrier sets.
- the foregoing process may also be performed in the time domain, and the frequency domain symbols of the corresponding length generated by the known signalling sequence subcarrier set after zero padding at the appropriate position are inversely transformed by Fourier transform.
- the time domain signaling waveform set is directly related to the time domain receiving signal for acquiring the accurate location of the multipath, and the one with the largest absolute value of the correlation value can also solve the signaling information of the frequency domain transmission, which will not be described here.
- the FFT operation of the corresponding length is performed, the zero carrier is removed, and the received frequency domain subcarrier is extracted according to the effective subcarrier position. Use it for signaling analysis.
- the receiving end may first perform demodulation PN operation on the received frequency domain subcarrier, and then perform ZC sequence signaling analysis. Signaling resolution can also be directly performed directly with the received frequency domain subcarriers of the undemodulated PN. The only difference between the two is that the method of knowing the sequence set is different. Will elaborate.
- the known signaling sequence set generated by using all possible different root values and/or different frequency domain shift values of the frequency domain main sequence transmitted by the transmitting end and all possible The frequency domain modulates the frequency offset value to resolve the signaling.
- the collection of known sequences here contains the following meanings:
- the known sequence set may refer to both the sequence set after modulating the PN and the pre-modulation PN. Sequence collection. If the receiving end performs the demodulation PN operation in the frequency domain, the known sequence set adopts the sequence set before the modulation PN. If the receiving end does not adopt the demodulation PN in the frequency domain, the known sequence set adopts the sequence set after the modulation PN. To use the time domain waveform corresponding to the known sequence set, the sequence set of the PN must be modulated by the CAZAC sequence.
- the known sequence set may refer to the sequence set of the CAZAC sequence/and or the frequency domain interleaved after the PN is modulated, or may be referred to before the frequency domain interleaving. Sequence collection. If the receiving end performs the interleaving operation in the frequency domain, the known sequence set adopts the sequence set before the frequency domain interleaving. If the receiving end does not use the deinterleaving operation in the frequency domain, the known sequence set adopts the frequency domain interleaved sequence set. .
- the CAZAC sequence and/or the modulation PN must be used and the set of sequences that are interleaved, that is, the set of sequence components that are finally mapped to the subcarriers.
- the generated sequence is further cyclically shifted based on different sequence generation and/or based on the same sequence generation.
- the frequency domain signaling subcarrier and the channel estimation value and all possible frequency domain subject sequences are subjected to specific mathematical operations for signaling analysis, wherein the specific mathematical operation includes any one of the following:
- H i is a channel estimation value corresponding to each signaling subcarrier
- SC_rec i is a received frequency domain signaling subcarrier value
- Equation 62 takes j corresponding to max(corr j ), that is, obtains frequency domain transmission signaling.
- the decoding process of the frequency domain transmission signaling may also be performed in the time domain, and the time domain signaling waveform set corresponding to the IWT transform by using the known signaling subcarrier set is directly related to obtaining the accurate location of the multipath.
- the domain receiving signal is synchronously related, and the one with the largest absolute value of the correlation value can also solve the frequency domain transmission signaling, which will not be described here.
- the receiving end obtains the frequency domain effective subcarrier, performs corresponding frequency domain deinterleaving operation, demodulates the PN operation, and performs ZC. Sequence signaling analysis. If the modulation PN is before the frequency domain interleaving, the frequency domain deinterleaving is performed first, and then the demodulation PN is performed. If the modulation PN is interleaved in the frequency domain, the PN is demodulated first, then the frequency domain deinterleaving is performed, or the frequency domain deinterleaving is performed first, and then the demodulation PN is performed. However, the demodulated PN sequence at this time is the demultiplexed PN sequence of the original PN.
- the predetermined transmission rule to be satisfied includes the time domain subject letter in each time domain symbol sent.
- the frequency domain main sequence corresponding to the number is processed to obtain a pre-generated subcarrier, and each of the effective subcarriers is phase-modulated or inverse Fourier transformed with a predetermined frequency offset value S in the frequency domain, and then cyclically shifted in the time domain.
- Bit the symbol of the transmission basic parameter contained in the preamble symbol as the PFC symbol.
- the analysis receiving algorithm has the following three examples of analysis signaling, which are ⁇ Example 1 of analysis signaling, ⁇ Example 2 of analysis signaling>, and Example 3 of ⁇ analysis signaling>.
- the time domain main signal A corresponding to each time domain symbol generated by the above rule in the preamble symbol is subjected to FFT operation to obtain a frequency domain signal, and the frequency domain signal is taken out of the effective subcarrier value.
- performing an arithmetic operation on each subcarrier and a subcarrier corresponding to each frequency domain known sequence of the known frequency domain signaling set of the symbol, performing an IFFT operation, and each frequency domain known sequence corresponds to an IFFT result, and each Based on the result of one or more IFFTs, the symbols select the most reliable IFFT result for each symbol, and can perform predetermined processing, and then use the processing result between multiple symbols to further perform some operation between symbols. Transmitting signaling information (including different frequency domain sequence transmission signaling and/or frequency domain modulation frequency offset real-time cyclic shift value signaling).
- the known frequency domain signaling set here includes all possible sequences of the frequency domain sequence in which the time domain main signal A corresponding to each time domain symbol is filled to the subcarrier before the frequency domain subcarrier modulation phase. If the transmitting end has a modulated PN operation, it refers to all possible frequency domain sequences after modulating the PN.
- the parsing method in the receiving method in the first example of parsing signaling Can be simplified as follows:
- the time domain main signal A corresponding to each time domain symbol is subjected to FFT operation to obtain a frequency domain signal, and the frequency domain signal is taken out of the value of the effective subcarrier, and each valid subcarrier is associated with the symbol.
- the effective subcarrier corresponding to the sequence performs some operation (conjugate multiplication/division operation), IFFT is performed.
- IFFT is performed.
- the cyclic shift value is signaled).
- the time domain main signal A is known to transmit the frequency domain pre-generated subcarrier without the phase modulation before the expression is A k , and the phase modulated expression is
- H k is the channel frequency domain response, and after receiving the channel, the received frequency domain data expression is
- the physical meaning is the product of the channel estimation value of each subcarrier and the modulation phase value; and another formula for the predetermined mathematical operation (Formula 67)
- the most reliable method of judging by the rules is that the peak value is the largest or the peak-to-average ratio is the largest.
- the step of selecting the most reliable one of the T results as the operation result of the symbol may be omitted, and each symbol is directly taken.
- the only IFFT result can be selected as the IFFT selection result.
- Figure 20 is a waveform diagram of the inverse Fourier result of a time domain body signal in AWGN in the first example of the analysis signaling of the present invention. As shown in FIG. 20, the maximum value of the discrete inverse Fourier transform appears as a sequence number of 1049 with a value of 1.024.
- C(q) can be the result of a certain original IFFT selected from T results, or it can be the result of obtaining the absolute value or the square of the absolute value.
- Figure 21 provides an example of analytical signaling.
- the inverse Fourier operation result of each time domain symbol can be further subjected to noise filtering processing, that is, the large value is reserved, and the small value is all set to zero. This step is optional.
- the following is a schematic diagram of C'(q-1) and C'(q) before and after the processing of two symbols before and after the 0 dB two-path channel.
- 22(a) and 22(b) are the previous time domain symbols before the noise filtering process in the embodiment, and the inverse Fourier results of the time domain body signals in the latter time domain symbol are respectively under the channel of 0 dB two paths.
- the waveform diagrams of Fig. 23(a) and Fig. 23(b) are the previous time domain symbols after the noise filtering process in the embodiment, and the inverse Fourier results of the time domain body signals in the latter time domain symbol are respectively 0 dB. Waveform under the channel Figure.
- the transmitted signaling can be derived from the corresponding shift value, and the transmission signaling is generated by the frequency domain sequence of the time domain main signal A corresponding to the time domain symbol in the preamble symbol, and then the S value is generated.
- Each effective subcarrier is phase modulated, that is, equivalent to the cyclic shift of the time domain OFDM symbol after IFFT.
- C'(q) is cyclically shifted by V to obtain C"(q, V), and the left shift or the right shift can be selected.
- the right shift is selected.
- the predetermined processing operation between the plurality of time domain symbols is only an example, and is not necessarily limited to conjugate multiplication, and the multiplication and accumulation operation may not need to do N FFT points, only a few large The value is OK.
- the Accum(V) with the largest absolute value is selected, and the corresponding V value can infer the transmission signal of the frequency domain modulation frequency offset real-time cyclic shift value.
- the method of the calculation is not limited here.
- the flow of the parsing signaling is included in the receiving method of the preamble corresponding to the first example of the parsing signaling, and the receiving method of the preamble is omitted in the second example of the parsing signaling.
- the parsing step of the signaling includes the following specific steps:
- Each time domain symbol is based on an inverse Fourier selection result selected from one or more inverse Fourier results in a first predetermined selection rule for directly solving signaling information and/or utilizing multiple
- a predetermined processing operation is performed between the time domain symbols, and the signaling information is solved based on the obtained inter-symbol processing result.
- the time domain main signal A corresponding to each time domain symbol is subjected to FFT operation to obtain a frequency domain signal, and the frequency domain signal is taken out of the effective subcarrier value, and each effective subcarrier is
- the symbol is known to be a valid subcarrier corresponding to each frequency domain known sequence of the frequency domain signaling set and the channel estimation value is subjected to a predetermined mathematical operation (conjugate multiplication/division operation), and then an IFFT operation is performed, and each frequency domain has been
- the sequence of knowledge corresponds to an IFFT result, and each symbol is selected based on the result of one or more IFFTs, and one of the most reliable IFFT selection results for each symbol is selected according to a predetermined selection rule, and optionally predetermined processing is performed, which can be selected based on IFFT.
- the result is used to directly obtain the signaling transmission value, and further, the processing result between the multiple symbols is utilized, and the predetermined processing operation (for example, delay correlation) between the time domain symbols is performed to solve the transmitted signaling (including different frequencies).
- the domain sequence transmits signaling and/or the frequency domain modulation frequency offset is transmitted by the real-time cyclic shift value.
- the known frequency domain signaling set refers to all possible sequences of the frequency domain sequence in which the time domain main signal A corresponding to each time domain symbol is filled to the subcarrier before the frequency domain subcarrier modulation phase, for example, the transmitting end has a modulation PN operation, where Refers to all possible frequency domain sequences after modulating the PN.
- the second example of the parsing signaling can be simplified as follows:
- a predetermined mathematical operation conjuggate multiplication/division operation
- an IFFT operation is performed, and based on the result of the IFFT, the predetermined processing may be selectively performed. It can be used to directly obtain the signaling transmission value, and can also reuse the processing result between multiple symbols, and further perform delay correlation between symbols to solve the transmitted signaling (frequency domain modulation frequency offset real-time cyclic shift value signaling) ).
- the main time domain signal A is known to transmit the frequency domain pre-generated subcarrier without the phase modulation before the expression is A k , and the phase modulated expression is
- H k is the channel frequency domain response, and after receiving the channel, the received frequency domain data expression is
- each time domain symbol will get the result of t IFFT operations, and the result will be taken as an absolute value.
- the most reliable judgment method in the predetermined selection rule may be the peak maximum or the peak-to-average ratio.
- the step of selecting the peak-to-average ratio of the T results as the operation result of the symbol may be omitted, and each of them is directly taken.
- the unique IFFT result of the symbol is sufficient.
- Figure 24 is a waveform diagram of the inverse Fourier result of a time domain body signal in Example 2 of the analytical signaling of the present invention at AWGN. As shown in the figure, the maximum value of the discrete inverse Fourier transform appears as 633 with a value of 0.9996.
- C(q) can be the result of a certain original IFFT selected from T results, or it can be the result of obtaining the absolute value or the square of the absolute value.
- the time domain cyclic shift value can be directly derived by using the position of the peak with the largest absolute value in C(q), thereby introducing the frequency domain modulation frequency offset immediately.
- the signal transmitted by the domain cyclic shift value for example, the position corresponding to the maximum peak in the above figure is 633. (There is no limit to the calculation method here.)
- the transmitted signaling can be derived.
- the transmission signaling satisfies the frequency domain sequence of the time domain main signal A corresponding to the time domain symbol in the predetermined transmission rule of the transmitting end, and then generates a pre-generated subcarrier according to the S value, and performs phase modulation on each valid subcarrier according to the S value, that is, the equivalent It is implemented by cyclically shifting the time domain OFDM symbols after IFFT.
- C'(q) is cyclically shifted by V to obtain C"(q, V), and left shift or right shift can be selected.
- right shift is selected, V ⁇ [0, N FFT -1],
- the above is only an example, and it is not limited to the conjugate multiplication.
- the multiplication and accumulation operation does not need to do N FFT points, and only a few large value points can be used.
- the Accum(V) with the largest absolute value is selected, and the corresponding V value corresponds to the transmitted signaling.
- the channel estimation value H est used in the above introduction the first time domain symbol of the preamble symbol is generally known, and the time domain/frequency domain estimation method is available from the known sequence, such as receiving frequency in the frequency domain.
- the domain signal is obtained in a known frequency domain sequence.
- the channel estimation of the subsequent symbols, after the decoding of the previous symbol is completed, assumes that the decoding is correct, and uses the previous decoding information as the transmission information, and performs channel estimation again in the time domain/frequency domain, and the previous channel estimation. As a result, a specific operation is performed to obtain a new channel estimation result, which is used for channel estimation of the signaling of the next symbol.
- the first example of the analysis signaling and the IFFT operation mentioned in the second example of the analysis signaling have a specific mathematical relationship based on the IFFT operation and the FFT operation, and if the FFT is equivalently implemented, the present invention is not deviated from the present invention. content.
- Both the first example of the parsing signaling and the second example of the parsing signaling use coherent demodulation, and the noise is eliminated in the time domain, and has very robust performance in multipath channels and low SNR.
- the present invention avoids amplification noise compared to the prior art method of utilizing direct and differential symbol frequency domain direct difference in the background art. Further utilizing the front and rear symbols The relative displacement of the arithmetic structure solves the problem of misjudgment when the channel estimation is not accurate or the interference path occurs for various reasons.
- the flow of the parsing signaling in the method for receiving the preamble symbol is included in the method for receiving the preamble symbol corresponding to the first example of the parsing signaling, and the example of the parsing signaling is The overall overview of the method of receiving the leading symbols is omitted.
- the known frequency domain signaling set of each time domain symbol is first extended to a known frequency domain signaling extension set. Then, the time domain main signal A corresponding to each time domain symbol in the preamble symbol is subjected to FFT operation to obtain a frequency domain signal, and the frequency domain signal is taken out of the value of the effective subcarrier, and each effective subcarrier and the known frequency domain signal are obtained. After performing predetermined mathematical operations (conjugate multiplication/division) on the subcarriers corresponding to the known sequence of each frequency domain of the extended set and the channel estimation values, the accumulated values of the operation values on all the subcarriers are added to obtain an accumulated value.
- predetermined mathematical operations conjuggate multiplication/division
- the most reliable one is selected according to the second predetermined selection rule, and the frequency domain known sequence of the corresponding known frequency domain signaling extension set is used to derive the modulation frequency offset value.
- the frequency domain modulated frequency offset is transmitted in the real-time cyclic shift, and the known frequency domain sequence in the known frequency domain signaling set before the original unexpanded is obtained, and the different sequences in the frequency domain are solved.
- the transmitted signaling is transmitted in the real-time cyclic shift, and the known frequency domain sequence in the known frequency domain signaling set before the original unexpanded is obtained, and the different sequences in the frequency domain are solved.
- the uniquely known frequency domain sequence for each symbol is first extended to a known frequency domain signaling extension set. Then, the time domain main signal A corresponding to each time domain symbol is subjected to FFT operation to obtain a frequency domain signal, and the frequency domain signal is taken out of the value of the effective subcarrier, and each effective subcarrier and the known frequency domain signaling extension set are obtained. After performing a predetermined digital operation (conjugate multiplication/division operation) on the subcarriers corresponding to the known sequence of each frequency domain and the channel estimation value, the accumulated values of the operation values on all the subcarriers are added to obtain an accumulated value.
- a predetermined digital operation conjuggate multiplication/division operation
- the most reliable one is selected, and the frequency domain known sequence of the corresponding known frequency domain signaling extension set is used to derive the modulation frequency offset value, thereby obtaining the frequency domain modulation frequency offset.
- the real-time domain cyclic shift transmits signaling.
- the known frequency domain signaling set here refers to all possible sequences of the frequency domain sequence in which the time domain main signal A corresponding to each time domain symbol is filled to the subcarrier before the frequency domain subcarrier modulation phase, such as the modulation PN operation at the transmitting end. , here refers to all possible frequency domain sequences after modulation of the PN.
- the frequency domain signaling extension set is obtained by modulating subcarrier phases by all possible frequency offset values corresponding to each known frequency domain sequence in the known frequency domain signaling set, all possible S of which are possible. Modulating the frequency offset value will generate a known sequence of S modulation frequency offsets. For example, if there are T known frequency domain sequences L 1 , L 2 ..., L T in the original known frequency domain signaling set, each known frequency domain sequence L t will be modulated by the S frequency offset value. L t,1 , L t,2 ,..., L t,S, etc. are obtained , respectively. for example:
- T known frequency domain sequences 0, 1, , N FFT -1, where k corresponds to the subcarrier number, where the zero carrier is placed in sequence number 0.
- the extended set includes a total of S known frequency domain sequences.
- N zc be the number of effective subcarriers
- H est,k be the channel estimation value corresponding to the kth effective subcarrier
- R k is the received kth
- the values of the effective subcarriers, L k, t, s are the kth values of the t, s sequences of the known frequency domain sequence extension set.
- the modulation frequency offset value can be derived, thereby obtaining frequency domain modulation.
- the signal transmitted by the frequency domain is cyclically shifted; and the known frequency domain sequence in the known frequency domain signaling set before the original unexpanded is extracted by using t, and the transmission is performed by different sequences in the frequency domain. Signaling.
- the extended set includes a total of S known frequency domain sequences.
- the modulation frequency offset value can be derived, thereby obtaining the signaling transmitted by the frequency domain modulation frequency offset real-time cyclic shift.
- the channel estimate H est used in the above introduction the PFC part in the first time domain symbol is generally known, and the time domain/frequency domain estimation method is available from known sequences, such as receiving in the frequency domain.
- the frequency domain signal is obtained by the known frequency domain sequence, and the channel estimation of the subsequent symbol, when the decoding of the previous symbol is completed, assumes that the decoding is correct, and uses the previous decoding information as the transmission information, and then in the time domain/frequency domain.
- the channel estimation is performed once, and a specific operation is performed with the previous channel estimation result to obtain a new channel estimation result, which is used for channel estimation of the signaling analysis of the next symbol.
- the present invention also provides the apparatus for generating a preamble symbol, the apparatus for generating a frequency domain symbol, and the apparatus for receiving a preamble symbol, the apparatus for generating the preamble symbol, the apparatus for generating a frequency domain symbol, and the reception of a preamble symbol.
- the apparatus corresponds to the method for generating a preamble symbol, the method for generating a frequency domain symbol, and the method for receiving a preamble symbol in the foregoing embodiments, respectively, and then the structure and technical elements of the device may be formed by a corresponding conversion method of the generating method and the receiving method. This omission will not be described again.
Abstract
Description
5.43 | 2.56 | 0.71 | 0.06 | 2.72 | 0.77 | 1.49 | 6.06 | 4.82 | 2.10 |
5.62 | 4.96 | 4.93 | 4.84 | 4.67 | 5.86 | 5.74 | 3.54 | 2.50 | 3.75 |
0.86 | 1.44 | 3.83 | 4.08 | 5.83 | 1.47 | 0.77 | 1.29 | 0.16 | 1.38 |
4.38 | 2.52 | 3.42 | 3.46 | 4.39 | 0.61 | 4.02 | 1.26 | 2.93 | 3.84 |
3.81 | 6.21 | 3.80 | 0.69 | 5.80 | 4.28 | 1.73 | 3.34 | 3.08 | 5.85 |
1.39 | 0.25 | 1.28 | 5.14 | 5.54 | 2.38 | 6.20 | 3.05 | 4.37 | 5.41 |
2.23 | 0.49 | 5.12 | 6.26 | 3.00 | 2.60 | 3.89 | 5.47 | 4.83 | 4.17 |
3.36 | 2.63 | 3.94 | 5.13 | 3.71 | 5.89 | 0.94 | 1.38 | 1.88 | 0.13 |
0.27 | 4.90 | 4.89 | 5.50 | 3.02 | 1.94 | 2.93 | 6.12 | 5.47 | 6.04 |
1.14 | 5.52 | 2.01 | 1.08 | 2.79 | 0.74 | 2.30 | 0.85 | 0.58 | 2.25 |
5.25 | 0.23 | 6.01 | 2.66 | 2.48 | 2.79 | 4.06 | 1.09 | 2.48 | 2.39 |
5.39 | 0.61 | 6.25 | 2.62 | 5.36 | 3.10 | 1.56 | 0.91 | 0.08 | 2.52 |
5.53 | 3.62 | 2.90 | 5.64 | 3.18 | 2.36 | 2.08 | 6.00 | 2.69 | 1.35 |
5.39 | 3.54 | 2.01 | 4.88 | 3.08 | 0.76 | 2.13 | 3.26 | 2.28 | 1.32 |
5.00 | 3.74 | 1.82 | 5.78 | 2.28 | 2.44 | 4.57 | 1.48 | 2.48 | 1.52 |
2.70 | 5.61 | 3.06 | 1.07 | 4.54 | 4.10 | 0.09 | 2.11 | 0.10 | 3.18 |
3.42 | 2.10 | 3.50 | 4.65 | 2.18 | 1.77 | 4.72 | 5.71 | 1.48 | 2.50 |
4.89 | 4.04 | 6.12 | 4.28 | 1.08 | 2.90 | 0.24 | 4.02 | 1.29 | 3.61 |
4.36 | 6.00 | 2.45 | 5.49 | 1.02 | 0.85 | 5.58 | 2.43 | 0.83 | 0.65 |
1.95 | 0.79 | 5.45 | 1.94 | 0.31 | 0.12 | 3.25 | 3.75 | 2.35 | 0.73 |
0.20 | 6.05 | 2.98 | 4.70 | 0.69 | 5.97 | 0.92 | 2.65 | 4.17 | 5.71 |
1.54 | 2.84 | 0.98 | 1.47 | 6.18 | 4.52 | 4.44 | 0.44 | 1.62 | 6.09 |
5.86 | 2.74 | 3.27 | 3.28 | 0.55 | 5.46 | 0.24 | 5.12 | 3.09 | 4.66 |
4.78 | 0.39 | 1.63 | 1.20 | 5.26 | 0.92 | 5.98 | 0.78 | 1.79 | 0.75 |
4.45 | 1.41 | 2.56 | 2.55 | 1.79 | 2.54 | 5.88 | 1.52 | 5.04 | 1.53 |
5.53 | 5.93 | 5.36 | 5.17 | 0.99 | 2.07 | 3.57 | 3.67 | 2.61 | 1.72 |
2.83 | 0.86 | 3.16 | 0.55 | 5.99 | 2.06 | 1.90 | 0.60 | 0.05 | 4.01 |
6.15 | 0.10 | 0.26 | 2.89 | 3.12 | 3.14 | 0.11 | 0.11 | 3.97 | 5.15 |
4.38 | 2.08 | 1.27 | 1.17 | 0.42 | 3.47 | 3.86 | 2.17 | 5.07 | 5.33 |
2.63 | 3.20 | 3.39 | 3.21 | 4.58 | 4.66 | 2.69 | 4.67 | 2.35 | 2.44 |
0.46 | 4.26 | 3.63 | 2.62 | 3.35 | 0.84 | 3.89 | 4.17 | 1.77 | 1.47 |
2.03 | 0.88 | 1.93 | 0.80 | 3.94 | 4.70 | 6.12 | 4.27 | 0.31 | 4.85 |
0.27 | 0.51 | 2.70 | 1.69 | 2.18 | 1.95 | 0.02 | 1.91 | 3.13 | 2.27 |
5.39 | 5.45 | 5.45 | 1.39 | 2.85 | 1.41 | 0.36 | 4.34 | 2.44 | 1.60 |
5.70 | 2.60 | 3.41 | 1.84 | 5.79 | 0.69 | 2.59 | 1.14 | 5.28 | 3.72 |
5.55 | 4.92 | 2.64 |
1 | 9 | 10 | 16 | 18 | 21 | 28 | 29 | 32 | 35 | 49 | 51 | 53 | 54 | 55 |
57 | 59 | 60 | 61 | 65 | 68 | 70 | 74 | 75 | 76 | 77 | 78 | 82 | 84 | 85 |
86 | 88 | 90 | 95 | 96 | 103 | 113 | 120 | 123 | 125 | 126 | 133 | 134 | 135 | 137 |
138 | 140 | 141 | 142 | 145 | 147 | 148 | 150 | 151 | 155 | 156 | 157 | 161 | 163 | 165 |
167 | 170 | 176 | 178 | 179 | 181 | 182 | 184 | 185 | 187 | 194 | 200 | 201 | 204 | 209 |
210 | 217 | 222 | 223 | 224 | 225 | 229 | 232 | 234 | 235 | 237 | 239 | 241 | 244 | 246 |
247 | 248 | 249 | 251 | 252 | 253 | 254 | 255 | 262 | 270 | 272 | 273 | 280 | 282 | 290 |
291 | 306 | 307 | 308 | 309 | 311 | 313 | 314 | 315 | 317 | 320 | 326 | 327 | 330 | 331 |
333 | 336 | 338 | 340 | 342 | 345 | 347 | 349 |
105 | 244 | 172 | 249 | 280 | 251 | 293 | 234 | 178 | 11 | 63 | 217 | 83 | 111 | 282 |
57 | 85 | 134 | 190 | 190 | 99 | 180 | 38 | 191 | 22 | 254 | 186 | 308 | 178 | 251 |
277 | 261 | 44 | 271 | 265 | 298 | 328 | 282 | 155 | 284 | 303 | 113 | 315 | 299 | 166 |
342 | 133 | 115 | 225 | 13 | 26 | 326 | 148 | 195 | 145 | 185 | 121 | 58 | 162 | 118 |
151 | 182 | 230 | 39 | 249 | 305 | 309 | 144 | 188 | 181 | 265 | 140 | 212 | 137 | 10 |
298 | 122 | 281 | 181 | 267 | 178 | 187 | 177 | 352 | 4 | 353 | 269 | 38 | 342 | 288 |
277 | 88 | 124 | 120 | 162 | 204 | 174 | 294 | 166 | 157 | 56 | 334 | 110 | 183 | 131 |
171 | 166 | 321 | 96 | 37 | 261 | 155 | 34 | 149 | 156 | 267 | 332 | 93 | 348 | 300 |
245 | 101 | 186 | 117 | 329 | 352 | 215 | 55 |
0.63 | 2.34 | 5.57 | 6.06 | 0.55 | 5.68 | 2.20 | 1.58 | 2.23 | 4.29 |
1.80 | 3.89 | 4.08 | 2.41 | 5.06 | 0.10 | 4.49 | 4.15 | 4.99 | 6.18 |
0.86 | 4.31 | 3.08 | 0.73 | 1.67 | 5.03 | 4.26 | 1.73 | 5.58 | 2.74 |
5.06 | 1.23 | 1.67 | 1.31 | 2.19 | 5.90 | 2.13 | 3.63 | 3.90 | 0.73 |
4.13 | 5.90 | 5.00 | 1.78 | 6.10 | 2.45 | 2.00 | 3.61 | 1.72 | 5.90 |
4.07 | 0.39 | 4.72 | 2.73 | 4.67 | 3.56 | 4.13 | 3.07 | 3.74 | 4.87 |
1.54 | 4.28 | 1.88 | 2.96 | 3.07 | 4.13 | 1.97 | 5.69 | 4.45 | 2.07 |
6.05 | 4.88 | 3.39 | 2.55 | 5.83 | 1.86 | 1.65 | 4.23 | 0.46 | 3.24 |
1.39 | 0.19 | 0.66 | 4.13 | 4.83 | 2.26 | 2.19 | 3.06 | 5.66 | 0.66 |
5.19 | 5.04 | 4.62 | 3.64 | 0.66 | 3.52 | 1.18 | 4.18 | 5.93 | 5.51 |
1.05 | 2.18 | 5.87 | 1.27 | 0.92 | 0.66 | 5.75 | 0.16 | 5.04 | 0.54 |
5.68 | 0.13 | 4.76 | 0.56 | 1.57 | 1.59 | 4.50 | 3.18 | 0.82 | 3.84 |
4.39 | 5.53 | 2.25 | 3.20 | 4.04 | 6.03 | 4.41 | 0.32 | 1.39 | 5.06 |
4.67 | 3.20 | 4.63 | 0.88 | 6.00 | 3.99 | 0.31 | 3.72 | 4.17 | 3.37 |
4.77 | 0.30 | 4.85 | 2.65 | 0.88 | 3.13 | 1.77 | 6.05 | 0.46 | 1.93 |
4.25 | 1.47 | 6.12 | 1.18 | 3.19 | 3.00 | 2.88 | 5.43 | 1.01 | 2.96 |
2.16 | 1.17 | 4.77 | 6.07 | 5.32 | 3.55 | 1.64 | 4.35 | 5.10 | 3.87 |
2.79 | 4.57 | 0.51 | 3.27 | 2.42 | 1.52 | 1.40 | 0.19 | 0.35 | 4.96 |
6.04 | 4.90 | 5.47 | 5.55 | 1.40 | 1.91 | 4.62 | 4.22 | 2.11 | 4.14 |
2.33 | 2.75 | 2.68 | 2.06 | 4.86 | 0.34 | 0.47 | 3.13 | 2.97 | 0.05 |
5.75 | 1.51 | 6.22 | 2.48 | 5.10 | 5.20 | 2.18 | 2.31 | 4.29 | 3.09 |
3.93 | 5.47 | 3.22 | 1.84 | 4.67 | 1.35 | 3.04 | 0.60 | 0.62 | 5.09 |
6.04 | 5.39 | 2.71 | 2.47 | 1.86 | 2.69 | 1.75 | 4.94 | 5.98 | 1.08 |
5.99 | 3.84 | 3.67 | 5.53 | 1.59 | 5.60 | 1.22 | 5.35 | 4.44 | 2.72 |
5.97 | 5.08 | 2.32 | 0.13 | 4.52 | 2.18 | 1.36 | 5.72 | 4.76 | 2.98 |
5.30 | 1.71 | 4.31 | 2.05 | 1.68 | 4.61 | 3.86 | 2.52 | 5.36 | 2.39 |
3.29 | 1.47 | 6.05 | 0.48 | 5.57 | 1.29 | 4.88 | 5.97 | 0.53 | 0.88 |
5.43 | 2.12 | 3.97 | 2.61 | 2.51 | 0.50 | 6.00 | 5.86 | 5.35 | 1.15 |
5.38 | 4.42 | 5.05 | 0.96 | 2.41 | 4.84 | 0.79 | 4.99 | 0.51 | 1.32 |
5.09 | 1.33 | 2.83 | 2.27 | 4.36 | 0.53 | 5.89 | 4.98 | 5.33 | 2.12 |
2.35 | 0.59 | 1.94 | 1.65 | 4.44 | 2.99 | 4.37 | 0.01 | 1.64 | 0.08 |
5.34 | 4.09 | 2.14 | 3.31 | 3.69 | 1.38 | 5.95 | 3.31 | 2.44 | 4.81 |
4.03 | 4.80 | 0.39 | 3.28 | 4.57 | 0.30 | 4.66 | 2.21 | 4.22 | 2.20 |
3.98 | 4.78 | 3.97 | 6.17 | 5.59 | 2.78 | 5.92 | 3.61 | 1.41 | 0.88 |
5.24 | 5.47 | 2.38 | 2.42 | 3.22 | 5.38 | 5.02 | 5.10 | 3.06 | 2.43 |
1.51 | 4.52 | 4.85 |
Claims (155)
- 一种前导符号的生成方法,其特征在于,包括如下步骤:基于时域主体信号生成具有下述三段结构的时域符号;以及基于至少一个所述时域符号生成所述前导符号,其中,所述前导符号包含:具有第一种三段结构的时域符号;或具有第二种三段结构的时域符号;或不分先后排列的若干个具有所述第一种三段结构的时域符号和/或若干个具有第二种三段结构的时域符号的自由组合,所述第一种三段结构包括:所述时域主体信号、根据从时域主体信号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的调制信号,所述第二种三段结构包括:所述时域主体信号、根据从时域主体信号截取的部分时域主体信号所生成的前缀、根据该部分时域主体信号的部分或全部所生成的超前缀。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述前缀、所述后缀或所述超前缀的生成步骤中,包含:所述前缀从时域主体信号后部直接截取得到;所述后缀或所述超前缀是对与所述前缀对应的部分时域符号全部或部分进行调制得到。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述前缀、所述后缀或所述超前缀的生成步骤中,包含:对从所述时域主体信号后部截取出的信号按照第一预定处理规则进行处理形成所述前缀,对从所述时域主体信号后部截取出的信号按照第二预定处理规则进行处理形成所述后缀或所述超前缀,所述第一预定处理规则包括:直接拷贝;或乘以一个相同固定系数或预定不同系数,所述第二预定处理规则包括:当所述第一预定处理规则为直接拷贝时进行调制处理;或者当所述第一预定处理规则为乘以一个相同固定系数或预定不同系数时也乘以相应的系数后进行调制处理。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述后缀或超前缀的长度不超过所述前缀的长度。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述后缀或所述超前缀的生成步骤包括:设置频移序列;将所述部分时域主体信号的部分或全部乘以该频移序列以得到所述后缀或所述超前缀。
- 如权利要求5所述的前导符号的生成方法,其特征在于:其中,所述频移序列的调制频偏值根据时域主体信号对应的频域子载波间隔或者根据所述超前缀、所述后缀的长度来确定,所述频移序列任意选择初相。
- 如权利要求1所述的前导符号的生成方法,其特征在于:确定一种所述循环前缀的长度、所述后缀或所述超前缀的长度的组合前提下,在生成所述后缀或所述超前缀时,通过以不同的起始位置截取所述部分时域主体信号,以传输信令信息或标识紧急广播。
- 如权利要求1所述的前导符号的生成方法,其特征在于:当所述前导符号仅包含第一种三段结构和第二种三段结构中的其中一种来标识非紧急广播,则利用另一种来标识紧急广播;或者利用第一种三段结构和第二种三段结构之间的不同先后排序来标识紧急广播。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,当所述前导符号中包含至少两个所述三段结构且存在不同种三段结构时,所述第一种三段结构中选取所述后缀或所述超前缀的起点对应于所述时域主体信号的第一采样点序号,和所述第二种三段结构中选取所述后缀或所述超前缀的起点对应于所述时域主体信号的第二采样点序号之间满足预定约束关系。
- 如权利要求9所述的前导符号的生成方法,其特征在于:其中,所述预定约束关系包含:设所述第一采样点序号为N1_1,所述第二采样点序号为N1_2,所述时域主体信号的长度为NA,所述前缀的长度为LenC,所述后缀或所述超前缀的长度为LenB,则满足N1_1+N1_2=2NA-(LenB+Lenc)。
- 如权利要1所述的前导符号的生成方法,其特征在于:其中,当生成所述后缀或所述超前缀时所采用的调制方法是调制频偏时,所述第一种三段结构中和所述第二种三段结构中的频偏值相反。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述前导符号包含至少一个所述时域符号,该至少一个所述时域符号包含:首个所述时域符号采用所述第一种三段结构,其余顺次级联的所述时域符号分别采用所述第二种三段结构。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述时域主体信号的长度为2048个采样周期,所述前缀长度为520个采样周期,所述后缀或所述超前缀长度为504个采样周期,针对所述第一种三段结构中,所述后缀在所述时域符号中截取的起始位置为第1544个采样;针对所述第二种三段结构中,所述超前缀在所述时域符号中截取的起始位置为第1528个采样。
- 如权利要求1所述的前导符号的生成方法,其特征在于:其中,所述时域主体信号由对频域子载波进行变换得到,该频域子载波基于频域主体序列生成,在生成所述频域子载波的步骤中,包含:用于生成所述频域主体序列的预定序列生成规则;和/或对所述频域主体序列进行处理用于生成所述频域子载波的预定处理规则,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照频偏值进行相位调制。
- 一种前导符号的生成方法,其特征在于,包括如下步骤:基于所得到的时域主体信号生成具有下述三段结构的时域符号;以及基于至少一个所述时域符号生成所述前导符号,其中,所生成的所述前导符号至少包含一个或者两个所述时域符号,该时域符号具有任意以下第一种三段结构或第二种三段结构,所述第一种三段结构包括:所述时域主体信号、根据从所述时域主体信号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的后缀,所述第二种三段结构包括:所述时域主体信号、根据从所述时域主体信号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的超前缀。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述前缀、所述后缀或所述超前缀的生成步骤中,包含:所述前缀从时域主体信号后部直接截取得到,所述后缀或所述超前缀是对与所述前缀对应的部分时域符号全部或部分进行调制得到。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述前缀、所述后缀或所述超前缀的生成步骤中,包含:对从所述时域主体信号后部截取出的信号按照第一预定处理规则进行处理形成所述前缀,对从所述时域主体信号后部截取出的信号按照第二预定处理规则进行处理形成所述后缀或所述超前缀,所述第一预定处理规则包括:直接拷贝;或乘以一个相同固定系数或预定不同系数,所述第二预定处理规则包括:当所述第一预定处理规则为直接拷贝时进行调制处理;或者当所述第一预定处理规则为乘以一个相同固定系数或预定不同系数时也乘以相应的系数后进行调制处理。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述后缀或超前缀的长度不超过所述前缀的长度。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述后缀或所述超前缀的生成步骤包括:设置频移序列;将所述部分时域主体信号的部分或全部乘以该频移序列以得到所述后缀或所述超前缀。
- 如权利要求21所述的前导符号的生成方法,其特征在于:其中,所述频移序列的调制频偏值根据时域主体信号对应的频域子载波间隔或者根据所述超前缀、所述后缀的长度来确定,所述频移序列任意选择初相。
- 如权利要求17所述的前导符号的生成方法,其特征在于:确定一种所述循环前缀的长度、所述后缀或所述超前缀的长度的组合前提下,在生成所述后缀或所述超前缀时,通过以不同的起始位置截取所述部分时域主体信号,以传输信令信息或标识紧急广播。
- 如权利要求17所述的前导符号的生成方法,其特征在于:当所述前导符号仅包含第一种三段结构和第二种三段结构中的其中一种来标识非紧急广播,则利用另一种来标识紧急广播;或者利用第一种三段结构和第二种三段结构之间的不同先后排序来标识紧急广播。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,当所述前导符号中包含至少两个所述三段结构且存在不同种三段结构时,所述第一种三段结构中选取所述后缀或所述超前缀的起点对应于所述时域主体信号的第一采样点序号,和所述第二种三段结构中选取所述后缀或所述超前缀的起点对应于所述时域主体信号的第二采样点序号之间满足预定约束关系。
- 如权利要求25所述的前导符号的生成方法,其特征在于:其中,所述预定约束关系包含:设所述第一采样点序号为N1_1,所述第二采样点序号为N1_2,所述时域主体信号的长度为NA,所述前缀的长度为LenC,所述后缀或所述超前缀的长度为LenB,则满足N1_1+N1_2=2NA-(LenB+Lenc)。
- 如权利要17所述的前导符号的生成方法,其特征在于:其中,当生成所述后缀或所述超前缀时所采用的调制方法是调制频偏时,所述第一种三段结构中和所述第二种三段结构中的频偏值相反。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述前导符号包含至少一个所述时域符号,该至少一个所述时域符号包含:首个所述时域符号采用所述第一种三段结构,其余顺次级联的所述时域符号分别采用所述第二种三段结构。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述时域主体信号的长度为2048个采样周期,所述前缀长度为 520个采样周期,所述后缀或所述超前缀长度为504个采样周期,针对所述第一种三段结构中,所述后缀在所述时域符号中截取的起始位置为第1544个采样;针对所述第二种三段结构中,所述超前缀在所述时域符号中截取的起始位置为第1528个采样。
- 如权利要求17所述的前导符号的生成方法,其特征在于:其中,所述时域主体信号由对频域子载波进行变换得到,该频域子载波基于频域主体序列生成,在生成所述频域子载波的步骤中,包含:用于生成所述频域主体序列的预定序列生成规则;和/或对所述频域主体序列进行处理用于生成所述频域子载波的预定处理规则,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照频偏值进行相位调制。
- 一种频域符号的生成方法,其特征在于,包括如下步骤:在频域上分别生成固定序列和信令序列;以及将所述固定序列和所述信令序列进行交错排列后填充至有效子载波,用于形成频域符号。
- 如权利要33所述的频域符号的生成方法,其特征在于:其中,所述固定序列和所述信令序列进行交错排列,所述交错排列包含以下两种规则中的任意一种:第一预定交错排列规则:呈奇偶交错或者偶奇交错进行排列;以及第二预定交错排列规则:把一部分信令序列放在奇数子载波,另一部分信令序列放在偶数子载波,且把一部分固定序列放在奇数子载波,另一部分 固定序列放在偶数子载波。
- 如权利要33所述的频域符号的生成方法,其特征在于:其中,当所述前导符号由至少两个具有所述第一种三段结构或所述第二种三段结构的时域符号生成时,所述频域符号对应于所述时域符号中时域主体信号,该至少两个时域符号之间满足任意以下三个预定关联规则中的至少一个:第一预定关联规则:所述时域符号各自的信令序列集采取量相同;第二预定关联规则:所述时域符号的所述固定序列之间保持相同;第三预定关联规则:预定若干个所述时域符号中包含固定序列和信令序列的有效子载波位置是其它预定若干个所述时域符号中有效子载波位置的整体的左移或者右移。
- 一种频域符号的生成方法,其特征在于,包括如下步骤:以预定序列生成规则生成频域主体序列;和/或对所述频域主体序列以预定处理规则进行处理生成频域符号,其中,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照预定频偏值进行相位调制。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,在所述预定序列生成规则中,所述序列生成式的生成步骤包含:所述不同的序列生成式通过赋予同一恒包络零自相关序列不同根值得到,所述同一序列生成式通过赋予恒包络零自相关序列同一根值得到。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,在对基于所述预生成子载波以所述频偏值进行相位调制的步骤中,同一所述时域主体信号所对应的频域子载波利用同一频偏值对该频域子载波中每个有效子载波进行相位调制,不同所述时域主体信号所对应的频域子载波利用的所述频偏值不同。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,生成所述频域主体序列的步骤包含:利用所述预定序列生成规则中的基于不同的序列生成式以生成所述频域主体序列。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,生成所述频域主体序列的步骤包含:利用所述预定序列生成规则中的基于不同的序列生成式来生成所述频域主体序列,继续对该频域主体序列利用所述预定处理规则以生成所述频域子载波。
- 如权利要求36所述的频域符号的生成方法,其特征在于:其中,所述频域主体序列基于一个或者多个恒包络零自相关序列生成,所述频域主体序列具有预定序列长度NZC。
- 如权利要求41所述的频域符号的生成方法,其特征在于:当基于多个所述恒包络零自相关序列生成时,每个所述恒包络零自相关序列分别具有相应子序列长度LM,对每个所述恒包络零自相关序列按照所述预定序列生成规则生成具有子序列长度LM的子序列,将多个所述子序列拼接为具有所述预定序列长度NZC的所述频域主体序列。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,当用于进行信令传输的频域主体序列是利用所述预定序列生成规则生成时,若所述至少一个所述时域主体信号中第一个所述时域主体信号采用预 先已知的频域主体序列,则该频域主体序列和对应的所述频偏值不用于传输信令。
- 如权利要求36所述的频域符号的生成方法,其特征在于,其中,通过所述频域主体序列传输的信令包含用于指示物理帧的帧格式参数和/或用于指示紧急广播内容,所述物理帧中包含前导符号。
- 如权利要求36所述的频域符号的生成方法,其特征在于:其中,利用所述频域符号进行处理得到时域主体信号,由至少一个基于所述时域主体信号形成的时域符号来生成前导符号。
- 如权利要求45所述的频域符号的生成方法,其特征在于:所述频域主体序列具有的预定序列长度NZC不大于所述时域主体信号具有的傅里叶变换长度NFFT,基于所述频域主体序列处理得到所述预生成子载波的步骤中包含处理填充步骤,该处理填充步骤包括:参照预定序列长度NZC将所述频域主体序列映射成正频率子载波和负频率子载波;参照所述傅里叶变换长度NFFT在所述正频率子载波和所述负频率子载波外边缘填充预定个数的虚拟子载波和直流子载波;以及将所得子载波进行循环左移,使得零子载波对应于反傅里叶变换的第一个位置。
- 如权利要求46所述的频域符号的生成方法,其特征在于:所述处理填充步骤还包括以下步骤:对于所述频域主体序列进行PN调制,从而再进行所述映射,用于对各个所述时域主体信号对应的所述频域主体序列进行PN调制的PN序列之间相同或不相同。
- 如权利要求47所述的频域符号的生成方法,其特征在于,其中,将所述预定序列生成规则中进行所述循环移位这一步骤,设于进 行所述PN调制之前或之后。
- 如权利要求47所述的频域符号的生成方法,其特征在于,其中,利用第一个所述时域主体信号中对应的所述根值和/或用于进行所述PN调制的PN序列的初始相位传输信息。
- 如权利要求45所述的频域符号的生成方法,其特征在于,其中,所述时域符号具有下述三段结构:其中,第一种三段结构包含:所述时域主体信号、基于所述时域主体信号的全部或部分所生成的前缀、以及基于部分的时域主体信号的全部或部分所生成的后缀;第二种三段结构包含:所述时域主体信号、基于所述时域主体信号的全部或部分所生成的前缀、以及基于部分的时域主体信号的全部或部分所生成的超前缀,所述前导符号包含:具有所述第一种三段结构的所述时域符号;或具有所述第二种三段结构的时域符号;或不分先后排列的若干个具有所述第一种三段结构的时域符号和/或若干个具有第二种三段结构的时域符号的自由组合。
- 一种前导符号的接收方法,其特征在于,包括以下步骤:对接收信号进行处理;判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及在判断为是时,确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,接收的所述前导符号包含发送端根据预定生成规则以任意数量第一种三段结构和/或第二种三段结构自由组合生成的至少一个时域符号,所述第一种所述三段结构包含:时域主体信号、基于该时域主体信号全 部或部分生成的前缀、以及基于该部分时域主体信号的全部或部分生成的后缀,所述第二种所述三段结构包含:时域主体信号、基于该时域主体信号的全部或部分生成的前缀、以及基于该部分时域主体信号的全部或部分生成的超前缀。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,在判断得到的所述处理后的信号中是否存在期望接收的所述前导符号及在判断为是时,确定该前导符号的位置并解出该前导符号所携带的信令信息的步骤中,包含以下任意至少一种步骤:初始定时同步、整数倍频偏估计、精准定时同步、信道估计、解码分析以及小数倍频偏估计。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,利用以下任意至少一种来判断所述处理后的信号中是否存在期望接收的所述前导符号:初始定时同步方式、整数倍频偏估计方式、精准定时同步方式、信道估计方式、解码结果分析方式以及小数倍频偏估计方式。
- 如权利要53所述的前导符号的接收方法,其特征在于:通过初始定时同步方式初步确定前导符号的位置,基于该初始定时同步的结果,判断所述处理后的信号中是否存在期望接收的包含所述三段结构的前导符号。
- 如权利要求54所述的前导符号的接收方法,其特征在于:通过以下任意初始定时同步方式来初步确定前导符号的位置,第一初始定时同步方式,包含:利用第一预定三段时域结构和/或第二预定三段时域结构中任意两段间的处理关系对处理后的信号进行必要反处理后进行延迟滑动自相关来获取基础累加相关值;当包含至少两个三段结构的时域符号时,将基础累加相关值依据所述延迟滑动自相关的不同延迟长度进行分组,每一组按照至少两个时域符号特定的拼接关系再进行至少一个符号间延迟关系匹配和/或相位调整后进行数学运算,得到若干个某一延迟长度的最终累加相关值,则当仅有一个三段结构的时域符号时,该最终累加相关值即为基础累加相关值;以及基于最终累加相关值中的至少一个进行延迟关系匹配和/或特定的预定数学运算后,将运算值用于初始定时同步,第二初始定时同步方式,包含:当所述前导符号中任意三段结构中时域主体信号包含已知信号时,将时域主体信号依照预定N个差分值进行差分运算,并将已知信息对应的时域信号也进行差分运算,再将两者进行互相关得到N组与该N个差分值一一对应的差分相关的结果,基于该N组差分相关的结果进行初始同步,得到处理值,用于初步确定前导符号的位置,其中N≥1,其中,当基于第一初始定时同步方式和第二初始定时同步方式完成时,则将分别所得的所述处理值再进行加权运算,基于该加权运算值完成初始定时同步。
- 如权利要求55所述的前导符号的接收方法,其特征在于:在所述第一初始定时同步方式中,包含:其中,当包含两个三段结构的时域符号时,将所述基础累加相关值依据所述延迟滑动自相关的不同延迟长度进行分组,每一组按照两个时域符号特定的拼接关系再进行一个符号间延迟关系匹配和/或相位调整后进行数学运算,得到若干个某一延迟长度的所述最终累加相关值。
- 如权利要求55所述的前导符号的接收方法,其特征在于:其中,在所述第一初始定时同步方式中,还包括对每一个延迟滑动自相关过程中实施的应有延迟数进行一定范围内的调整,形成调整后的多个延迟 数,再依据所得调整后多个延迟数及应有延迟数进行多个延迟滑动自相关,选择最明显的那个相关结果作为基础累加相关值。
- 如权利要求55所述的前导符号的接收方法,其特征在于:其中,所述N个差分值依据以下任意至少一种预定差分选定规则选出,用以进行初始同步:第一预定差分选定规则包含:在与已知信息相对应的本地时域序列的长度范围内,选择任意若干个不同差分值;第二预定差分选定规则包含:在与已知信息相对应的本地时域序列的长度范围内,选择满足等差数列的若干个不同值。
- 如权利要求58所述的前导符号的接收方法,其特征在于:其中,当通过所述第一预定差分选定规则选定出N个差分值时,则将一一对应的获得的N组差分相关的结果进行加权绝对值相加或平均;或当通过所述第一预定差分选定规则或所述第二预定差分选定规则选定出时,则将基于选定出的N组差分相关的结果进行加权矢量相加或平均。
- 如权利要求52所述的前导符号的接收方法,其特征在于:其中,基于所述初始定时同步方式的结果,若检测出该结果满足预设条件,则判断为确定所述处理后的信号中存在期望接收的包含所述三段结构的前导符号,所述预设条件包含:基于初始定时同步结果进行特定运算,然后判断运算结果的最大值是否超过预定阈值门限,或进一步结合整数倍频偏估计结果和/或解码结果来确定。
- 如权利要求55所述的前导符号的接收方法,其特征在于:其中,利用所述第一初始定时同步方式和/或所述第二初始定时同步方式 的结果进行小数倍频偏估计,当利用所述第一初始定时同步方式的结果时,该结果包含用依据所述第一种三段结构和/或所述第二种三段结构中所述时域主体信号和所述前缀对应的的处理关系进行预定处理运算得到的所述最终累加相关值,由该累加相关值计算出第二小数倍频偏值;所述第一初始定时同步方式的结果还包含依据所述第一种三段结构和/或所述第二种三段结构中所述时域主体信号和所述后缀/所述超前缀对应的的处理关系以及所述前缀和所述后缀/所述超前缀对应的的处理关系,进行预定处理运算得到的两个所述最终累加相关值,依据该两个累加相关值计算出第三小数倍频偏值,可基于得到的第二小数倍频偏值和第三小数倍频偏值的任意至少之一来进行小数倍频偏估计,当利用所述第一初始定时同步方式和所述第二初始定时同步方式的结果时,基于所述第一小数倍频偏值、所述第二小数倍频偏值以及所述第三小数倍频偏值中的任意之一或者任意至少之二的组合来得到小数倍频偏值。
- 如权利要求52所述的前导符号的接收方法,其特征在于:前导符号的接收方法还包括:利用初始定时同步方式的结果进行小数倍频偏估计。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,在确定该前导符号的位置并解出该前导符号所携带的信令信息的步骤中,包含:利用前导符号的全部或部分时域波形和/或该前导符号的全部或部分时域波形经过傅里叶变换后得到的频域信号,以解出该前导符号所携带的信令信息。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,在所述预定生成规则中,所生成的所述前导符号包含:不分先后排列的若干个具有第一种所述三段结构的时域符号和/或若干个具有第二种所述三段结构的时域符号的自由组合,第一种所述三段结构包含:时域主体信号、基于该时域主体信号的后部生成的前缀、以及基于该时域主体信号的后部生成的后缀,第二种所述三段结构包含:时域主体信号、基于该时域主体信号的后部生成的前缀、以及基于该时域主体信号的后部生成的超前缀。
- 如权利要求64所述的前导符号的接收方法,其特征在于:当发送端通过以不同起点从所述时域主体信号中截取部分信号以生成所述后缀或所述超前缀时来实现传输不同的信令信息时,基于以下来解析信令:所述前缀与所述后缀或所述超前缀、和/或所述时域主体信号与所述后缀或所述超前缀两两之间所具有的相同内容的不同延迟关系。
- 如权利要求65所述的前导符号的接收方法,其特征在于:其中,所解析的信令包含紧急广播。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,所述前导符号通过频域符号经处理得到,该频域符号的生成步骤包含:将所分别生成的固定序列和信令序列以预定排列规则进行排列后填充至有效子载波上。
- 如权利要求67所述的前导符号的接收方法,其特征在于:其中,解出所述前导符号所携带的信令信息的步骤,包含:通过包含全部或者部分信令序列子载波的信号与信令序列子载波集合或该全部或者部分信令序列子载波集合对应的时域信号进行运算,以解出该前导符号中由信令序列子载波所携带的信令信息。
- 如权利要求67所述的前导符号的接收方法,其特征在于:其中,利用至少一个时域符号所包含的固定子载波序列进行精准定时同步。
- 如权利要求52所述的前导符号的接收方法,其特征在于:其中,当所述前导符号中所述时域主体信号或所对应的频域主体信号包含已知信号时,所述前导符号的接收方法还包括进行以下任意方式的整数倍频偏估计:根据初始定时同步的结果,截取至少包含全部或部分所述时域主体信号的一段时域信号,采用扫频方式对所截取出的该段时域信号以不同频偏进行调制后,得到若干N个与频偏值一一对应的扫频时域信号,将由已知频域序列进行傅里叶反变换所得的已知时域信号与每个扫频时域信号进行滑动互相关后,比较N个互相关结果的最大相关峰值,其最大的那个互相关结果所对应的扫频时域信号被调制的频偏值即为整数倍频偏估计值;或将根据初始定时同步的结果截取主体时域信号长度的时域信号进行傅里叶变换,将所得的频域子载波在扫频范围内按不同移位值进行循环移位,截取有效子载波所对应的接收序列,对该接收序列和已知频域序列进行预定运算再进行反变换,基于若干组移位值的一一对应的若干组反变换结果进行选择,得到最优的移位值,利用位值和整数倍频偏估计值之间的对应关系,获得整数倍频偏估计值。
- 如权利要求52所述的前导符号的接收方法,其特征在于:其中,所述信道估计的步骤,包含:任意在时域进行和/或在频域进行:当上一个时域主体信号译码结束后,利用所得到译码信息作为已知信息,在时域/频域再一次进行信道估计,并和之前的信道估计结果进行某种特定运算,得到新的信道估计结果,用于下一个时域主体信号的信令解析的信道估计。
- 如权利要求51所述的前导符号的接收方法,其特征在于:其中,接收的所述前导符号是基于对频域子载波进行处理得到,该频域 子载波基于频域主体序列生成,在生成所述频域子载波的步骤中,包含:用于生成所述频域主体序列的预定序列生成规则;和/或对所述频域主体序列进行处理用于生成所述频域子载波的预定处理规则,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照频偏值进行相位调制。
- 如权利要求72所述的前导符号的接收方法,其特征在于:在所述前导符号所包含的至少一个时域符号中第一个包含已知信息情况下,利用该已知信号进行精准定时同步。
- 如权利要求72所述的前导符号的接收方法,其特征在于:在解析信令信息步骤中,利用发送端所发送的频域主体序列的所有可能的不同根值和/或不同频域移位值而产生的已知信令序列集合以及所有可能的频域调制频偏值来解析信令。
- 如权利要求72所述的前导符号的接收方法,其特征在于:其中,当所述前导符号中所述时域主体信号或所对应的频域主体信号包含已知信号时,所述前导符号的接收方法还包括进行以下任意方式的整数倍频偏估计:根据初始定时同步的结果,截取至少包含全部或部分所述时域主体信号的一段时域信号,采用扫频方式对所截取出的该段时域信号以不同频偏进行调制后,得到若干N个与频偏值一一对应的扫频时域信号,将由已知频域序列进行变换所得的已知时域信号与每个扫频时域信号进行滑动互相关后,比较N个互相关结果的最大相关峰值,其最大的那个互相关结果所对应的扫频时域信号被调制的频偏值即为整数倍频偏估计值;或将根据初始定时同步的结果截取主体时域信号长度的时域信号进行傅里叶变换,将所得的频域子载波在扫频范围内按不同移位值进行循环移位,截取有效子载波所对应的接收序列,对该接收序列和已知频域序列进行预定运算再进行反变换,基于若干组移位值的一一对应的若干组反变换结果进行选择,得到最优的移位值,利用位值和整数倍频偏估计值之间的对应关系,获得整数倍频偏估计值。
- 如权利要求72所述的前导符号的接收方法,其特征在于:其中,所述信道估计的步骤,包含:任意在时域进行和/或在频域进行:当上一个时域主体信号译码结束后,利用所得到译码信息作为已知信息,在时域/频域再一次进行信道估计,并和之前的信道估计结果进行某种特定运算,得到新的信道估计结果,用于下一个时域主体信号的信令解析的信道估计。
- 如权利要求72所述的前导符号的接收方法,其特征在于,完成所述整数倍频偏估计后,对频偏进行补偿后进而对传输信令进行解析。
- 如权利要求72所述的前导符号的接收方法,其特征在于,当所述频域子载波的生成过程中,采用基于不同的序列生成式产生和/或基于同一序列生成式产生进一步将该产生的序列进行循环移位时,将所述频域信令子载波与信道估计值以及所有可能的所述频域主体序列进行特定数学运算进行信令解析,其中,所述特定数学运算包含以下任意一种:结合信道估计的最大似然相关运算;或将所述信道估计值对所述频域信令子载波进行信道均衡后,再与所有可能的所述频域主体序列进行相关运算,选择最大相关值作为信令解析的译码结果。
- 如权利要求72所述的前导符号的接收方法,其特征在于,其中,当所述频域子载波的生成过程中采用对预生成子载波以所述频偏值进行相位调制或反傅里叶变换后在时域中进行循环移位。
- 如权利要求79所述的前导符号的接收方法,其特征在于:其中,在确定前导符号的位置并解析出该前导符号携带的信令信息的步骤中,包含:将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有效子载波;将每个所述有效子载波与该时域符号的已知频域信令集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算后反傅里叶变换,对应于每一个所述频域已知序列得到一个反傅里叶结果;以及每个所述时域符号基于以第一预定选定规则从一个或多个所述反傅里叶结果中所选出的反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求80所述的前导符号的接收方法,其特征在于:对所述反傅里叶选定结果进行取绝对值或取绝对值平方,再来以所述第一预定选定规则选出反傅里叶选定结果。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,所述第一预定选定规则包含以峰值最大进行选定和/或者以峰均比最大进行选定。
- 如权利要求80所述的前导符号的接收方法,其特征在于,还包括:滤噪处理步骤,包括:可将每个时域符号的反傅里叶结果进行滤噪处理,将大值保留,小值全部置零。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,所解析出的信令信息包含:不同频域序列传送信令和/或频域调制频偏即时域循环移位值所传信令。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,当时域符号的已知频域序列集仅有1个已知序列,则所述第一预定选定规则为直接取其每个所述时域符号的唯一所述反傅里叶结果作为所述反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求80所述的前导符号的接收方法,其特征在于:其中,将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息的步骤中,包含:将后一个时域符号进行循环移位,与前一个时域符号进行相乘或共轭相乘并累加得到累加值,找出对应于所有预定频偏值或循环位移值中累加值最大的移位值,由该移位值推算出所述信令信息。
- 如权利要求79所述的前导符号的接收方法,其特征在于,包括:在确定前导符号的位置并解析出该前导符号携带的信令信息的步骤中,该步骤包含:将每个时域符号的已知频域信令集扩展为已知频域信令扩展集;将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有 效子载波;将每个所述有效子载波与所述已知频域信令扩展集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算得到运算值,再进行所有有效子载波上所述运算值的累加;以及以第二预定选定规则从多组累加值选取出一个累加值,利用其对应的已知频域信令扩展集的频域已知序列,推得频域调制频偏值即时域循环移位所传输信令,并推得所对应的原始未扩展前的已知频域信令集里的已知频域序列,解出由频域不同序列所传输的信令信息。
- 如权利要求89所述的前导符号的接收方法,其特征在于,其中,所述第二预定选定规则包含以取绝对值最大值或者是取实部最大值进行选定。
- 如权利要求89所述的前导符号的接收方法,其特征在于,其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求89所述的前导符号的接收方法,其特征在于,其中,已知频域信令扩展集通过如下方式得到:将已知频域信令集里的每一个已知频域序列进行对应的按所有可能频偏值调制子载波相位,其所有可能的S个调制频偏值,则将生成S个调制频偏后的已知序列。
- 如权利要求92所述的前导符号的接收方法,其特征在于,其中,当该符号未扩展的已知频域信令集仅有一个已知序列,即仅依靠频域调制频偏s即时域循环移位值传输信令信息时,则已知频域信令扩展集包含共S个已知频域序列,利用调制频偏s其对应的已知频域信令扩展集的频域已知序列,即可推得调制频偏值,得到频域调制频偏即时域循环移位传输的信令信息。
- 如权利要求89所述的前导符号的接收方法,其特征在于,其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求79所述的前导符号的接收方法,包括:在确定前导符号在物理帧中位置并解析出该前导符号携带的信令信息的的步骤中,包含:将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有效子载波;将每个所述有效子载波与该时域符号的已知频域信令集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算后反傅里叶变换,对应于每一个所述频域已知序列得到一个反傅里叶结果;以及每个所述时域符号基于以第一预定选定规则从一个或多个所述反傅里叶结果中所选出的反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,所述预定发送规则包含:发送的每个时域符号中时域主体信号对应的频域主体序列进行处理得到生成预生成子载波后,在频域中以预定频偏值S对每个有效子载波进行相位调制或反傅里叶变换后在时域中进行循环移位。
- 如权利要求95所述的前导符号的接收方法,其特征在于,还包括,对所述反傅里叶选定结果进行取绝对值或取绝对值平方,再来以所述第一预定选定规则选出反傅里叶选定结果。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,所述第一预定选定规则包含以峰值最大进行选定和/或者以峰均比最大进行选定。
- 如权利要求95所述的前导符号的接收方法,其特征在于,还包括,滤噪处理步骤,包括:可将每个时域符号的反傅里叶结果进行滤噪处理,将大值保留,小值全部置零。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,所解析出的信令信息包含:不同频域序列传送信令和/或频域调制频偏即时域循环移位值所传信令。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,当时域符号的已知频域序列集仅有1个已知序列,则所述第一预定选定规则为直接取其每个所述时域符号的唯一所述反傅里叶结果作为所述反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求95所述的前导符号的接收方法,其特征在于,其中,将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息的步骤中,包含:将后一个时域符号进行循环移位,与前一个时域符号进行相乘或共轭相乘并累加得到累加值,找出对应于所有预定频偏值或循环位移值中累加值最大的移位值,由该移位值推算出所述信令信息。
- 一种前导符号的接收方法,其特征在于,包括如下步骤:对接收信号进行处理;判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及在判断为是时,确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,接收的所述前导符号通过频域符号经处理得到,该频域符号的生成步骤包含:将所分别生成的固定序列和信令序列以预定排列规则进行排列后填充至有效子载波上。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,利用以下任意至少一种来判断所述处理后的信号中是否存在期望接收的所述前导符号:初始定时同步方式、整数倍频偏估计方式、精准定时同步方式、信道估计方式、解码结果分析方式以及小数倍频偏估计方式。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,在判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及在判断为是时确定该前导符号的位置并解出该前导符号所携带的信令信息的步骤中,包含以下任意至少一种步骤:初始定时同步、整数倍频偏估计、精准定时同步、信道估计、解码分析以及小数倍频偏估计。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,利用所述固定序列进行整数倍频偏估计或信道估计,包括以下步骤:根据所确定该前导符号的位置,截取包含全部或部分固定子载波的信号;将该包含全部或部分固定子载波的信号与频域固定子载波序列或该频域固定子载波序列对应的时域信号进行运算,以得到整数倍频偏估计或信道 估计。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,利用所述前导符号中至少一个时域符号所包含的固定子载波序列进行精准定时同步。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,在确定该前导符号的位置并解出该前导符号所携带的信令信息的步骤中,包含:利用前导符号的全部或部分时域波形和/或该前导符号的全部或部分时域波形经过傅里叶变换后得到的频域信号,以解出该前导符号所携带的信令信息。
- 如权利要求105所述的前导符号的接收方法,其特征在于,还包括:其中,当所述前导符号中所述时域主体信号或所对应的频域主体信号包含已知信号时,所述前导符号的接收方法还包括进行以下任意一种整数倍频偏估计的步骤:根据初始定时同步的结果,截取至少包含全部或部分所述时域主体信号的一段时域信号,采用扫频方式对所截取出的该段时域信号以不同频偏进行调制后,得到若干N个与频偏值一一对应的扫频时域信号,将由已知频域序列进行反变换所得的已知时域信号与每个扫频时域信号进行滑动互相关后,比较N个互相关结果的最大相关峰值,其最大的那个互相关结果所对应的扫频时域信号被调制的频偏值即为整数倍频偏估计值;或将根据初始定时同步的结果截取主体时域信号长度的时域信号进行傅里叶变换,将所得的频域子载波在扫频范围内按不同移位值进行循环移位,截取有效子载波所对应的接收序列,对该接收序列和已知频域序列进行预定运算再进行反傅里叶变换,基于若干组移位值的一一对应的若干组反变换结果进行选择,得到最优的移位值,利用位值和整数倍频偏估计值之间的对应 关系,获得整数倍频偏估计值。
- 如权利要求105所述的前导符号的接收方法,其特征在于:其中,解出所述前导符号所携带的信令信息的步骤,包含:通过包含全部或者部分信令序列子载波的信号与信令序列子载波集合或该信令序列子载波集合对应的时域信号进行运算,以解出该前导符号中由信令序列子载波所携带的信令信息。
- 一种前导符号的接收方法,其特征在于,包括如下步骤:对接收信号进行处理;判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及在判断为是时,确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,接收的所述前导符号是基于对频域子载波进行反傅里叶变换得到,该频域子载波基于频域主体序列生成,在生成所述频域子载波的步骤中,包含:用于生成所述频域主体序列的预定序列生成规则;和/或对所述频域主体序列进行处理用于生成所述频域子载波的预定处理规则,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照频偏值进行相位调制。
- 如权利要求113所述的前导符号的接收方法,其特征在于:其中,在判断得到的所述处理后的信号中是否存在期望接收的所述前导符号以及在判断为是时,确定该前导符号的位置并解出该前导符号所 携带的信令信息的步骤中,包含以下任意至少一种步骤:初始定时同步、整数倍频偏估计、精准定时同步、信道估计、解码分析以及小数倍频偏估计。
- 如权利要求113所述的前导符号的接收方法,其特征在于:其中,利用以下任意至少一种来判断所述处理后的信号中是否存在期望接收的所述前导符号:初始定时同步方式、整数倍频偏估计方式、精准定时同步方式、信道估计方式以及解码结果分析方式。进行小数倍频偏估计。
- 如权利要求114所述的前导符号的接收方法,其特征在于:其中,当所述前导符号中至少一个时域符号中第一个包含已知信息时,利用该已知信号进行精准定时同步。
- 如权利要求114所述的前导符号的接收方法,其特征在于:其中,所述信道估计的步骤,包含:任意在时域进行和/或在频域进行:当上一个时域主体信号译码结束后,利用所得到译码信息作为发送信息,在时域/频域再一次进行信道估计,并和之前的信道估计结果进行某种特定运算,得到新的信道估计结果,用于下一个时域主体信号的信令解析的信道估计。
- 如权利要求114所述的前导符号的接收方法,其特征在于:其中,当所述前导符号中时域主体信号或所对应的频域主体信号包含已知信号时,所述前导符号的接收方法还包括进行以下任意方式的整数倍频偏估计:采用扫频方式对所截取出的全部或部分时域信号以不同频偏进行调制后,得到若干个扫频时域信号,将由已知频域序列进行反变换所得的已知时域信号与每个扫频时域信号进行滑动相关后,将最大相关峰值的扫频时域信号所调制的频偏值即为整数倍频偏估计值;或将根据初始定时同步的位置结果截取主体时域信号进行傅里叶变换所得的频域子载波在扫频范围内按不同移位值进行循环移位,截取有效子载波所对应的接收序列,对该接收序列和已知频域序列进行预定运算再进行反变换,基于若干组移位值的反变换结果得到移位值和整数倍频偏估计值之间的对应关系,由此获得整数倍频偏估计值。
- 如权利要求113所述的前导符号的接收方法,其特征在于,完成所述整数倍频偏估计后,对频偏进行补偿后进而对传输信令进行解析。
- 如权利要求113所述的前导符号的接收方法,其特征在于,当所述频域子载波的生成过程中,采用基于不同的序列生成式产生和/或基于同一序列生成式产生进一步将该产生的序列进行循环移位时,将所述频域信令子载波与信道估计值以及所有可能的所述频域主体序列进行特定数学运算进行信令解析,其中,所述特定数学运算包含以下任意一种:结合信道估计的最大似然相关运算;或将所述信道估计值对所述频域信令子载波进行信道均衡后,再与所有可能的所述频域主体序列进行相关运算,选择最大相关值作为信令解析的译码结果。
- 如权利要求113所述的前导符号的接收方法,其特征在于:其中,在确定该前导符号的位置并解出该前导符号所携带的信令信息的步骤中,包含:利用前导符号的全部或部分时域波形和/或该前导符号的全部或部分时域波形经过傅里叶变换后得到的频域信号,以解出该前导符号所携带的信令信息。
- 如权利要求113所述的前导符号的接收方法,其特征在于,其中,当所述频域子载波的生成过程中采用对预生成子载波以所述频偏值进行相位调制或反傅里叶变换后在时域中进行循环移位。
- 如权利要求122所述的前导符号的接收方法,其特征在于:在确定前导符号的位置并解析出该前导符号携带的信令信息的步骤中,包含:将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有效子载波;将每个所述有效子载波与该时域符号的已知频域信令集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算后反傅里叶变换,对应于每一个所述频域已知序列得到一个反傅里叶结果;以及每个所述时域符号基于以第一预定选定规则从一个或多个所述反傅里叶结果中所选出的反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求123所述的前导符号的接收方法,其特征在于,还包括,对所述反傅里叶选定结果进行取绝对值或取绝对值平方,再来以所述第一预定选定规则选出反傅里叶选定结果。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,所述第一预定选定规则包含以峰值最大进行选定和/或者以峰均比最大进行选定。
- 如权利要求123所述的前导符号的接收方法,其特征在于,还包括,滤噪处理步骤,包括:可将每个时域符号的反傅里叶结果进行滤噪处理,将大值保留,小值全部置零。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,所解析出的信令信息包含:不同频域序列传送信令和/或频域调制频偏即时域循环移位值所传信令。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,当时域符号的已知频域序列集仅有1个已知序列,则所述第一预定选定规则为直接取其每个所述时域符号的唯一所述反傅里叶结果作为所述反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求123所述的前导符号的接收方法,其特征在于,其中,将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息的步骤中,包含:将后一个时域符号进行循环移位,与前一个时域符号进行相乘或共轭相乘并累加得到累加值,找出对应于所有预定频偏值或循环位移值中累加值最大的移位值,由该移位值推算出所述信令信息。
- 如权利要求122前导符号的接收方法,包括:在确定前导符号的位置并解析出该前导符号携带的信令信息的步骤中,该步骤包含:将每个时域符号的已知频域信令集扩展为已知频域信令扩展集;将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有效子载波;将每个所述有效子载波与所述已知频域信令扩展集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算得到运算值,再进行所有有效子载波上所述运算值的累加;以及以第二预定选定规则从多组累加值选取出一个累加值,利用其对应的已知频域信令扩展集的频域已知序列,推得频域调制频偏值即时域循环移位所传输信令,并推得所对应的原始未扩展前的已知频域信令集里的已知频域序列,解出由频域不同序列所传输的信令信息。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,所述预定发送规则包含:在所述频域子载波的生成过程中采用对预生成子载波以所述频偏值进行相位调制或反傅里叶变换后在时域中进行循环移位。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,所述第二预定选定规则包含以取绝对值最大值或者是取实部最大值进行选定。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,已知频域信令扩展集通过如下方式得到:将已知频域信令集里的每一个已知频域序列进行对应的按所有可能频偏值调制子载波相位,其所有可能的S个调制频偏值,则将生成S个调制频偏后的已知序列。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,当该符号未扩展的已知频域信令集仅有一个已知序列,即仅依靠 频域调制频偏s即时域循环移位值传输信令信息时,则已知频域信令扩展集包含共S个已知频域序列,利用调制频偏s其对应的已知频域信令扩展集的频域已知序列,即可推得调制频偏值,得到频域调制频偏即时域循环移位传输的信令信息。
- 如权利要求132所述的前导符号的接收方法,其特征在于,其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求122的前导符号的接收方法,包括:在确定前导符号在物理帧中位置并解析出该前导符号携带的信令信息的步骤中,该步骤包含:将每个所述时域符号的所述时域主体信号进行傅里叶变换后提取出有效子载波;将每个所述有效子载波与该时域符号的已知频域信令集中每一频域已知序列对应的已知子载波以及信道估计值进行预定数学运算后反傅里叶变换,对应于每一个所述频域已知序列得到一个反傅里叶结果;以及每个所述时域符号基于以第一预定选定规则从一个或多个所述反傅里叶结果中所选出的反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,所述预定发送规则包含:发送的每个时域符号中时域主体信号对应的频域主体序列进行处理得到生成预生成子载波后,在频域中以预定频偏值S对每个有效子载波进行相位调制或反傅里叶变换后在时域中进行循环移位。
- 如权利要求139所述的前导符号的接收方法,其特征在于,还包括,对所述反傅里叶选定结果进行取绝对值或取绝对值平方,再来以所述第一预定选定规则选出反傅里叶选定结果。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,所述第一预定选定规则包含以峰值最大进行选定和/或者以峰均比最大进行选定。
- 如权利要求139所述的前导符号的接收方法,其特征在于,还包括,滤噪处理步骤,包括:可将每个时域符号的反傅里叶结果进行滤噪处理,将大值保留,小值全部置零。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,所解析出的信令信息包含:不同频域序列传送信令和/或频域调制频偏即时域循环移位值所传信令。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,所述已知频域信令集指每个时域符号对应的主体时域信号在频域子载波调制相位前填充至子载波的频域序列的所有可能序列。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,当时域符号的已知频域序列集仅有1个已知序列,则所述第一预定选定规则为直接取其每个所述时域符号的唯一所述反傅里叶结果作为所述反傅里叶选定结果,再将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,所述预定数学运算包含:共轭相乘或除法运算。
- 如权利要求139所述的前导符号的接收方法,其特征在于,其中,将多个所述时域符号之间进行预定处理操作,基于所得的符号间处理结果解出所述信令信息的步骤中,包含:将后一个时域符号进行循环移位,与前一个时域符号进行相乘或共轭相 乘并累加得到累加值,找出对应于所有预定频偏值或循环位移值中累加值最大的移位值,由该移位值推算出所述信令信息。
- 一种前导符号的生成装置,其特征在于,包括:时域符号生成单元,基于时域主体信号生成具有下述三段结构的时域符号;以及前导符号生成单元,基于至少一个所述时域符号生成所述前导符号,其中,所述前导符号生成单元所生成的所述前导符号包含:具有第一种三段结构的时域符号;或具有第二种三段结构的时域符号;或不分先后排列的若干个具有所述第一种三段结构的时域符号和/或若干个具有第二种三段结构的时域符号的自由组合,所述第一种三段结构包括:所述时域主体信号、根据从时域主体信号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的调制信号,所述第二种三段结构包括:所述时域主体信号、根据从时域主体信号截取的部分时域主体信号所生成的前缀、根据该部分时域主体信号的部分或全部所生成的超前缀。
- 一种前导符号的生成装置,其特征在于,包括:时域符号生成单元,基于所得到的时域主体信号生成具有下述三段结构的时域符号;以及前导符号生成单元,基于至少一个所述时域符号生成所述前导符号,其中,所述前导符号生成单元所生成的所述前导符号至少包含一个或者两个所述时域符号,该时域符号具有任意以下第一种三段结构或第二种三段结构,所述第一种三段结构包括:所述时域主体信号、根据从所述时域主体信 号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的后缀,所述第二种三段结构包括:所述时域主体信号、根据从所述时域主体信号截取的部分时域主体信号所生成的前缀、基于该部分时域主体信号的部分或全部所生成的超前缀。
- 一种频域符号的生成装置,其特征在于,包括:序列生成单元,在频域上分别生成固定序列和信令序列;以及频域符号生成单元,将所述固定序列和所述信令序列进行交错排列后填充至有效子载波,用于形成频域符号。
- 一种频域符号的生成装置,其特征在于,包括:序列生成单元,以预定序列生成规则生成频域主体序列;和/或频域符号生成单元,对所述频域主体序列以预定处理规则进行处理生成频域符号,其中,所述序列生成单元中所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述频域符号生成单元中所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照预定频偏值进行相位调制。
- 一种前导符号的接收装置,其特征在于,包括:接收处理单元,对接收信号进行处理;判断单元,判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及定位解析单元,在判断为是时确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,所述接收处理单元所接收的所述前导符号包含发送端根据预定生 成规则以任意数量第一种三段结构和/或第二种三段结构自由组合生成的至少一个时域符号,所述第一种所述三段结构包含:时域主体信号、基于该时域主体信号全部或部分生成的前缀、以及基于该部分时域主体信号的全部或部分生成的后缀,所述第二种所述三段结构包含:时域主体信号、基于该时域主体信号的全部或部分生成的前缀、以及基于该部分时域主体信号的全部或部分生成的超前缀。
- 一种前导符号的接收装置,其特征在于,包括:接收处理单元,对接收信号进行处理;判断单元,判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及定位解析单元,在判断为是时确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,所述接收处理单元所接收的所述前导符号通过频域符号经处理得到,该频域符号的生成步骤包含:将所分别生成的固定序列和信令序列以预定排列规则进行排列后填充至有效子载波上。
- 一种前导符号的接收装置,其特征在于,包括:接收处理单元,对接收信号进行处理;判断单元,判断得到的所述处理后的信号中是否存在期望接收的所述前导符号;以及定位解析单元,在判断为是时确定该前导符号的位置并解出该前导符号所携带的信令信息,其中,所述接收处理单元所接收的所述前导符号是基于对频域子载波进行反傅里叶变换得到,该频域子载波基于频域主体序列生成,在生成所述频域子载波的步骤中,包含:用于生成所述频域主体序列的预定序列生成规则;和/或对所述频域主体序列进行处理用于生成所述频域子载波的预定处理规则,所述预定序列生成规则包含以下任意一种或两种组合:基于不同的序列生成式产生;和/或基于同一序列生成式产生,进一步将该产生的序列进行循环移位,所述预定处理规则包含:对基于所述频域主体序列进行处理所得的预生成子载波按照频偏值进行相位调制。
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