WO2016070687A1 - Procédé d'estimation de synchronisation et dispositif d'extrémité de réception - Google Patents

Procédé d'estimation de synchronisation et dispositif d'extrémité de réception Download PDF

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WO2016070687A1
WO2016070687A1 PCT/CN2015/090385 CN2015090385W WO2016070687A1 WO 2016070687 A1 WO2016070687 A1 WO 2016070687A1 CN 2015090385 W CN2015090385 W CN 2015090385W WO 2016070687 A1 WO2016070687 A1 WO 2016070687A1
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sequence
long
preamble
received
cross
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PCT/CN2015/090385
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English (en)
Chinese (zh)
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刘刚
周海军
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电信科学技术研究院
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/12—Channels characterised by the type of signal the signals being represented by different phase modulations of a single carrier

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  • the present disclosure relates to the field of communications technologies, and in particular, to a synchronization estimation method and a receiving end device.
  • the preamble is used for automatic gain control (AGC), synchronization, and frequency offset estimation.
  • the preamble usually includes a short preamble and a long preamble.
  • the short preamble can be used to roughly determine the reception time of the long preamble, and the interception of a long preamble for time domain correlation can estimate the exact time of the received signal.
  • the short preamble and the long preamble occupy the same frequency band.
  • Figure 2 shows a schematic diagram of the frame structure of 802.11p, in which the first 10 symbols (t1 ⁇ t10) are short preambles, GI2 is a cyclic prefix of long preambles, and the last two symbols (T1 and T2) are long preambles.
  • the code, GI is the cyclic prefix of the data symbol.
  • the SIGNAL field is the physical layer control channel, and the DATA field is the high layer signaling and data.
  • symbol timing estimation ie, estimating the starting position of the preamble, such as the starting position of the short preamble or the starting position of the long preamble
  • the starting position estimates a range of frequency offsets.
  • the symbol timing further includes Two processes of coarse synchronization and fine synchronization.
  • M 1 ( ⁇ )-M 2 ( ⁇ ) according to the following formula to get the result of coarse synchronization
  • the peak value is the start time of the ninth short preamble symbol.
  • ⁇ represents the start time of the synchronization estimation
  • r( ⁇ ) represents the received signal sequence
  • m represents the position relative to the start time
  • r * () represents the conjugate operation of the received sequence
  • fine synchronization using the two repeated long preamble sequences in the frame structure, determined in the coarse synchronization
  • the approximate location uses the autocorrelation algorithm to obtain fine synchronization.
  • n'' (n(i))* ⁇ r(i+k ⁇ N x )+(r(i)-n(i)) * ⁇ n(i+k ⁇ N x ).
  • d(i) r(i+k ⁇ N x ) ⁇ (r(i)) * , and the multiple values of d(i) can reduce the influence of noise and improve the accuracy of frequency offset estimation.
  • f ⁇ ⁇ ⁇ /(k ⁇ N x ⁇ T S ) be the frequency offset estimation error.
  • mean() represents the mean operation
  • angle() represents the phase operation
  • T S represents the sampling interval
  • ⁇ represents the phase deviation.
  • the short preamble sequence can estimate an effective frequency offset range of (-156.25*2, 156.25*2) KHz.
  • the frequency offset can be effectively estimated, and therefore, the short preamble sequence can be estimated.
  • the effective frequency offset range is (-156.25/2, 156.25/2) KHz. Therefore, in the frame structure of 802.11p, the short preamble can be used for rough frequency offset estimation.
  • the estimated range is (-156.25*2, 156.25*2) KHz, and the estimated absolute error is large; after the coarse frequency offset estimation The frequency offset estimation value is used to perform phase compensation on the subsequent data; finally, the long preamble code is used for fine frequency offset estimation, and the estimated range is (-156.25/2, 156.25/2) KHz.
  • the embodiment of the present disclosure provides a synchronization estimation method and a receiving end device, which are used to solve the problem that the existing synchronization estimation accuracy is low.
  • the long preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is the same as the sequence in the long sequence and the first set length from the prefix, and the sequence in the suffix The sequence is the same as the sequence of the second set length in the long sequence and the suffix.
  • timing estimation is performed according to a long preamble in the preamble, including:
  • Calculating an autocorrelation value of the received sequence and its shifted sequence determining a receiving moment of the receiving sequence whose autocorrelation value is greater than a set threshold as a first positioning position, and calculating a cross-correlation value of the base sequence corresponding to the long sequence corresponding to the long sequence Determining a receiving time of the receiving sequence corresponding to the peak as a second positioning position; wherein the receiving sequence is a data sequence received at different times, and an interval length between the shifting sequence and the receiving sequence is in a preamble Length of long sequence;
  • calculating a cross-correlation value of the base sequence corresponding to the long sequence of the received sequence, and determining a receiving moment of the received sequence corresponding to the peak as the second positioning location including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the received sequence corresponding to the peak.
  • determining, according to the location difference, a cyclic shift sequence that generates the long sequence including:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined to generate a cyclic shift sequence of the long sequence.
  • the method further includes:
  • the control information includes at least one of the following information: a cyclic prefix CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • performing frequency offset estimation according to the long preamble in the preamble including:
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • determining an integer multiple frequency offset value according to the cross-correlation value corresponding to each received sequence including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as the integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the long sequence is an m sequence, or a Zadoff-Chu sequence.
  • a receiving module configured to receive a data sequence including a preamble
  • a processing module configured to perform timing estimation and/or frequency offset estimation according to a long preamble in the preamble
  • the long preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is the same as the sequence in the long sequence that is separated from the prefix by a first set length, and the sequence in the suffix The same sequence as the second set length from the suffix in the long sequence.
  • the processing module performs timing estimation according to the long preamble in the preamble, including:
  • Calculating an autocorrelation value of the received sequence and its shifted sequence determining a receiving moment of the receiving sequence whose autocorrelation value is greater than a set threshold as a first positioning position, and calculating a cross-correlation value of the base sequence corresponding to the long sequence corresponding to the long sequence Determining a receiving time of the receiving sequence corresponding to the peak as a second positioning position; wherein the receiving sequence is a data sequence received at different times, and an interval length between the shifting sequence and the receiving sequence is in a preamble Length of long sequence;
  • the processing module calculates a cross-correlation value of the base sequence corresponding to the long sequence of the received sequence, and determines a receiving moment of the received sequence corresponding to the peak as the second positioning location, including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the received sequence corresponding to the peak.
  • the processing module determines, according to the location difference, a cyclic shift sequence that generates the long sequence, including:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined to generate a cyclic shift sequence of the long sequence.
  • the processing module determines to generate the cyclic shift sequence of the long sequence, the processing module is further configured to:
  • the control information includes at least one of the following information: a cyclic prefix CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • the processing module performs frequency offset estimation according to the long preamble in the preamble, including:
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • the processing module determines an integer multiple frequency offset value according to the cross-correlation value corresponding to each received sequence, including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as the integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the long sequence is an m sequence, or a Zadoff-Chu sequence.
  • the embodiment of the present disclosure further provides another receiving end device, including a processor and a transceiver, where
  • a processor for reading a program in the memory performing the following process:
  • the long preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is the same as the sequence in the long sequence that is separated from the prefix by a first set length, and the sequence in the suffix The same sequence as the second set length of the long sequence from the suffix;
  • a transceiver for receiving and transmitting data under the control of a processor.
  • the processor performs timing estimation according to the long preamble in the preamble, including:
  • Calculating an autocorrelation value of the received sequence and its shifted sequence determining a receiving moment of the receiving sequence whose autocorrelation value is greater than a set threshold as a first positioning position, and calculating a cross-correlation value of the base sequence corresponding to the long sequence corresponding to the long sequence Determining a receiving time of the receiving sequence corresponding to the peak as a second positioning position; wherein the receiving sequence is a data sequence received at different times, and an interval length between the shifting sequence and the receiving sequence is in a preamble Length of long sequence;
  • the processor calculates a cross-correlation value of the base sequence corresponding to the long sequence of the received sequence, and determines a receiving moment of the received sequence corresponding to the peak as the second positioning location, including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the received sequence corresponding to the peak.
  • the processor determines, according to the location difference, a cyclic shift sequence that generates the long sequence, including:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined to generate a cyclic shift sequence of the long sequence.
  • the processor determines to generate a cyclic shift sequence of the long sequence in the long preamble, the processor is further configured to:
  • the control information includes at least one of the following information: a CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • the processor performs frequency offset estimation according to the long preamble in the preamble, including:
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • the processor determines, according to the cross-correlation value corresponding to each received sequence, an integer multiple offset value, including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as the integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the long sequence is an m sequence, or a Zadoff-Chu sequence.
  • the embodiment of the present disclosure provides a new preamble structure, where the long preamble of the preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is separated from the sequence by a first set length in the long sequence.
  • the sequence in the suffix is the same as the sequence in the long sequence and the suffix from the second set length. Since the synchronization estimation is performed, the sequence carried in the pre- and post-suffixes of the long preamble and the segment in the long sequence may be utilized. The same structural characteristics of the sequence, thereby increasing the speed and accuracy of the synchronization estimation.
  • 1 is a schematic diagram of a commonly used channel structure
  • FIG. 2 is a schematic diagram of a frame structure of 802.11p
  • FIG. 3 is a schematic structural diagram of a frame according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic flowchart diagram of a synchronization estimation method according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a first receiving end device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of a second receiving end device according to an embodiment of the present disclosure.
  • the synchronization estimation is performed.
  • the long preamble in the preamble includes a prefix, a long sequence, and a suffix, where the sequence in the prefix is separated from the long sequence by the prefix.
  • a sequence of a set length is the same, and the sequence in the suffix is the same as the sequence in the long sequence and the suffix is a second set length, because the length of the preamble provided by the embodiment of the present disclosure is long.
  • the preamble includes the same two sequences before and after, and the synchronization estimation speed and accuracy can be improved when performing synchronization estimation.
  • the preamble provided by the embodiment of the present disclosure includes a short preamble (abbreviated as short code) and a long preamble (abbreviated as long code), and the structures of the short preamble and the long preamble are respectively described in detail below.
  • the short preamble provided by the embodiment of the present disclosure carries at least two identical short sequences, and the specific number of short sequences is determined by the total length of the short preamble and the length of each short sequence.
  • the short preamble provided by the embodiment of the present disclosure may have a length of 16, 32, and 64 sampling points (one of which is a digital signal value), and is mainly used for implementing fast AGC estimation and adjustment, or for coarse timing. And frequency offset estimation.
  • the autocorrelation is better (that is, the autocorrelation value obtained by performing the autocorrelation operation is greater than the set first threshold), and the cross correlation is poor ( That is, a sequence in which the cross-correlation value obtained by the cross-correlation operation is smaller than the set second threshold value is taken as a short sequence.
  • the short sequence employs an m-sequence, or a ZC (Zaddoff-Chu) sequence.
  • the long preamble provided by the embodiment of the present disclosure includes a prefix, a long sequence and a suffix in sequence, wherein the sequence in the prefix is the same as the sequence in the long sequence and the first set length from the prefix, and the sequence in the suffix is neutralized with the long sequence.
  • the suffix is the same sequence from the second set length.
  • the sequence with the same prefix in the long sequence and the sequence with the same suffix in the long sequence do not overlap each other.
  • the long sequence includes A, B, and C in sequence
  • the sequence in the prefix is the same as the sequence in C
  • the sequence in the suffix is the same as the sequence in A
  • the sequence in the prefix is the first from the sequence in C.
  • the set length means that the Mth sample point of the sequence in the prefix is separated from the Mth sample point of the sequence in C by a first set length, and M is a positive integer.
  • the first set length and the second set length may be the same or different.
  • the first set length is the same as the second set length.
  • the first set length is 2 n sample points (ie, n) is a positive integer; the second set length is 2 n , n is A positive integer.
  • the first set length is 512 points (ie, 512 sample points), and the second set length is also 512 points; for example, the first set length is 256 points, and the second set length is 512 points.
  • the long preamble provided by the embodiment of the present disclosure mainly performs functions such as timing, frequency offset estimation, and control information identification.
  • the autocorrelation is better (ie, the autocorrelation value obtained by performing the autocorrelation operation is greater than the set first threshold), and the cross correlation is poor ( That is, a sequence in which the cross-correlation value obtained by the cross-correlation operation is smaller than the set second threshold) is used as a long sequence.
  • the long sequence is an m sequence, or a ZC sequence.
  • the long sequence of embodiments of the present disclosure may be generated by any of the time domain cyclic shift sequences in the set base sequence.
  • the base sequence set corresponding to the ZC sequence, and the time domain cyclic shift sequence corresponding to each base sequence refer to section 5.7.2 of the 3GPP 36.211 protocol.
  • any of the sets of all m-sequences can be understood as a base sequence, and sequences other than any of the sequences can be understood as a time-domain cyclic shift sequence of any of the sequences.
  • composition of the long preamble is illustrated by a 512-point ZC sequence (ie, the ZC sequence includes 512 sample points) and a 10 MHz bandwidth as an example:
  • the long preamble includes a 512-point time domain Zadoff-chu sequence and pre- and post-suffixes, wherein the lengths of the pre- and post-suffixes are determined by the total length of the 512-point ZC sequence; wherein the 512-point time-domain ZC sequence is complemented by the 301-point frequency-domain ZC sequence.
  • the 512-point IFFT transform is performed; and the 301-point frequency-domain ZC sequence is generated by a cyclic shift sequence of a base sequence, and different base sequences correspond to different cyclic shift sequences, for example, if the base sequence If the serial number is 1, the sequence number of the cyclic shift sequence can be selected as one of [0, 21, 23].
  • the content of the ZC sequence such as the base sequence, the cyclic shift sequence of the base sequence, how to generate the ZC sequence, etc., refer to Section 5.7.2 of the 3GPP 36.211 protocol.
  • FIG. 3 A preferred structural diagram of the frame structure of the embodiment of the present disclosure is shown in FIG. 3.
  • M represents a short code in the preamble
  • the long code in the figure adopts a ZC sequence
  • the ZC sequence includes A, B, and C.
  • an embodiment of the present disclosure provides a synchronization estimation method, where the method includes:
  • Step 41 Receive a data sequence that includes a preamble sent by the sending end.
  • Step 42 Perform timing estimation and/or frequency offset estimation according to the long preamble in the preamble to implement synchronization with the transmitting end.
  • the long preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is the same as the sequence in the long sequence and the first set length from the prefix, and the sequence in the suffix is separated from the long sequence by the suffix.
  • the sequence of the second set length is the same.
  • the execution body of the foregoing step 41 and step 42 is a receiving end device, such as a terminal.
  • a new preamble structure where the long preamble of the preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is separated from the prefix by the first set length in the long sequence.
  • the sequence in the suffix is the same as the sequence in the long sequence and the suffix is separated from the second set length. Since the synchronization estimation is performed, the sequence carried in the pre- and post-suffixes in the long preamble and the long sequence can be utilized. The same structural characteristics of a certain sequence, thereby improving the speed and accuracy of the synchronization estimation.
  • step 42 the timing estimation is performed according to the long preamble in the preamble, including the following steps:
  • the receiving sequence is a data sequence received at different times, and the length of the interval between the shift sequence and the received sequence is the length of the long sequence in the preamble;
  • Calculating the position difference between the first positioning position and the second positioning position Determining, according to the position difference, a cyclic shift sequence that generates a long sequence
  • a difference between the second positioning position and the reception time of the reception sequence corresponding to the peak of the auto-correlation of the base sequence generated by the cyclic shift sequence of the long sequence Determined as the starting position of the long preamble (ie, the time domain location of the first sample point in the long preamble).
  • the mobile autocorrelation operation is performed on the received sequence, and the shift length is the length of the long sequence, so that the approximate timing of the long preamble can be obtained by using the same prefix in the long preamble in the frame structure and the third sequence in the long sequence. position (ie, the approximate starting position of the long preamble); then use the local base sequence and the received sequence to perform cross-correlation operations to determine Last according to Determining an accurate timing position of the long preamble (ie, an accurate starting position of the long preamble) to determine the exact timing of the received sequence corresponding to the peak of the auto-correlation of the cyclic sequence of the long sequence and the base sequence. Synchronize.
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the receiving time of the receiving sequence corresponding to the peak is determined as the second positioning position, including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the reception sequence corresponding to the peak.
  • determining a cyclic shift sequence for generating a long sequence includes:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined as a cyclic shift sequence that generates a long sequence.
  • the position of the autocorrelation peak of the cyclic shift sequence corresponding to each base sequence is known, and as long as the sequence number of the base sequence is known, the cyclic shift sequence of the base sequence and each cyclic shift sequence can be known.
  • the position of the autocorrelation peak with the base sequence Assuming that the base sequence corresponds to three cyclic shift sequences, the positions of the autocorrelation peaks of the three cyclic shift sequences and the base sequence are ⁇ 1 , ⁇ 2 , ⁇ 3 , respectively, and the method for determining the cyclic shift sequence for generating the long sequence is Therefore, it is judged that the cyclic shift sequence of the birth growth sequence is a cyclic shift sequence for the serial number.
  • the position of the autocorrelation peak of the cyclic shift sequence and the base sequence is ⁇ j , and finally And ⁇ j , to determine the exact timing position, ie
  • Timing estimation is performed by a method of performing coarse estimation using a long preamble in the preamble.
  • the method further includes:
  • the control information includes at least one of the following information: a cyclic prefix CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • different cyclic shift sequences may be used to indicate different control information, so that the receiving end can obtain the control information corresponding to the cyclic shift sequence after determining the cyclic shift sequence for generating the long sequence.
  • the different cyclic shift sequences specifically indicate which control information can be determined by the receiving end and the transmitting end, or can be specified in the protocol, as long as the receiving end and the transmitting end have the same understanding of the control information indicated by the different cyclic shift sequences. Just fine.
  • the frequency offset estimation is performed according to the long preamble in the preamble, including:
  • the product of the received sequence and the phase offset value obtained by the determined fractional octave offset estimation is calculated, and the obtained sequence is used as an intermediate sequence; the long preamble obtained by timing estimation is obtained.
  • the starting position is the starting point, and a subsequence whose length is the sampling length corresponding to the long sequence in the preamble is taken from the intermediate sequence; according to the set sliding point, the long sequence in the preamble is taken from the subsequence respectively a sliding sequence corresponding to the effective bandwidth length, and respectively calculating a cross-correlation value of the frequency domain sequence corresponding to each sliding sequence and the base sequence;
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • sampling length represents the number of sampling points in the time domain, and the sampling length is greater than or equal to the length of the long sequence; the effective bandwidth length is the physical quantity in the frequency domain.
  • the frequency offset estimation includes a fractional multiple frequency offset estimation (ie, a fractional multiple carrier spacing offset) and an integer multiple frequency offset estimation (integer multiple carrier spacing offset), wherein the fractional multiple frequency offset is adopted.
  • the frequency offset exceeding the fractional frequency offset estimation range is completed by the integer multiple frequency offset estimation.
  • the embodiment of the present disclosure provides a processing procedure of the preferred integer multiple frequency offset estimation, which is specifically as follows:
  • a subsequence r f (n) whose length is the sampling length corresponding to the long sequence in the preamble is taken from r t (n); for example, if long
  • the sequence adopts the ZC sequence, and the sub-sequence r f (n) having a length of 512 points is taken out from r t (n), and the sub-sequence obtained here is a frequency domain sequence;
  • a sliding sequence whose length is the effective bandwidth length corresponding to the long sequence in the preamble is respectively taken from r f (n), and each sliding sequence and the base sequence L f (k) are respectively calculated.
  • Corresponding cross-correlation value of the frequency domain sequence for example, if the long sequence adopts the ZC sequence, a sliding sequence having a length of 301 points is taken from r f (n);
  • an integer octave bias value is determined according to the cross-correlation value corresponding to each received sequence.
  • the sliding range of the sliding sequence is related to the predetermined crystal oscillator offset range, and the ZC sequence is taken as an example for the long sequence. If the frequency offset jitter of 5 ppm is considered, two points are swept left and right, and a total of five points are determined.
  • the sliding sequence can be, specifically: 512 points r f (n) intermediate position acquires 301 points as the first sliding sequence, and the first sliding sequence slides 1 point to the left to obtain 301 points as the second sliding sequence, the first The sliding sequence slides 2 points to the left to obtain 301 points as the third sliding sequence. The first sliding sequence slides 1 point to the right to obtain 301 points as the fourth sliding sequence, and the first sliding sequence slides 2 points to the right to obtain 301. The point serves as the fifth sliding sequence. If the jitter of the 20 ppm frequency offset is considered, then 8 points are swept left and right, and a total of 17 points of the sliding sequence can be determined.
  • determining an integer multiple frequency offset value according to the cross-correlation value corresponding to each received sequence including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as an integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the correspondence between the sliding point and the frequency offset value is preset.
  • the other sliding points other than the sliding point corresponding to the maximum cross-correlation value are noise, and the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold M is determined as an integer multiple frequency offset value.
  • the above method processing flow can be implemented by a software program, which can be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
  • a receiving end device is further provided in the embodiment of the present disclosure. Since the principle of solving the problem is similar to the foregoing synchronous estimating method, the implementation of the device may refer to the implementation of the method, and the repeated description is not repeated. .
  • a receiving end device provided by an embodiment of the present disclosure includes:
  • the receiving module 51 is configured to receive a data sequence that includes a preamble sent by the sending end.
  • the processing module 52 is configured to perform timing estimation and/or frequency offset estimation according to the long preamble in the preamble;
  • the long preamble includes a prefix, a long sequence, and a suffix, in which the prefix is included.
  • the sequence is the same as the sequence of the long sequence that is separated from the prefix by a first set length
  • the sequence in the suffix is the same as the sequence of the long sequence that is separated from the suffix by a second set length.
  • the receiving end device performs synchronization estimation based on a new preamble structure
  • the long preamble of the preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is separated from the long sequence by the prefix.
  • the sequence of a set length is the same
  • the sequence in the suffix is the same as the sequence of the second set length in the long sequence and the suffix. Since the synchronization estimation is performed, the sequence carried in the front and the suffix in the long preamble can be utilized. The same structural characteristics of a certain sequence in a long sequence, thereby improving the speed and accuracy of the synchronization estimation.
  • the processing module 52 performs timing estimation according to the long preamble in the preamble, including:
  • Calculating an autocorrelation value of the received sequence and its shifted sequence determining a receiving moment of the receiving sequence whose autocorrelation value is greater than a set threshold as a first positioning position, and calculating a cross-correlation value of the base sequence corresponding to the long sequence corresponding to the long sequence Determining a receiving time of the receiving sequence corresponding to the peak as a second positioning position; wherein the receiving sequence is a data sequence received at different times, and an interval length between the shifting sequence and the receiving sequence is in a preamble Length of long sequence;
  • the processing module 52 calculates a cross-correlation value of the base sequence corresponding to the long sequence of the received sequence, and determines a receiving moment of the received sequence corresponding to the peak as the second positioning location, including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the received sequence corresponding to the peak.
  • the processing module 52 determines, according to the position difference, a cyclic shift that generates the long sequence.
  • Sequence including:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined to generate a cyclic shift sequence of the long sequence.
  • the processing module 52 is further configured to:
  • the control information includes at least one of the following information: a cyclic prefix CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • the processing module 52 performs frequency offset estimation according to the long preamble in the preamble, including:
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • the processing module 52 determines an integer multiple frequency offset value according to the cross-correlation value corresponding to each received sequence, including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as the integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the long sequence is an m sequence, or a Zadoff-Chu sequence.
  • an embodiment of the present disclosure further provides another receiving end device, as shown in FIG. 6, including:
  • the processor 600 is configured to read a program in the memory 620 and perform the following process:
  • the long preamble includes a prefix, a long sequence, and a suffix, wherein the sequence in the prefix is the same as the sequence in the long sequence that is separated from the prefix by a first set length, and the sequence in the suffix The same sequence as the second set length from the suffix in the long sequence.
  • the transceiver 610 is configured to receive and transmit data under the control of the processor 600.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 600 and various circuits of memory represented by memory 620.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 610 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 in performing operations.
  • the processor 600 performs timing estimation according to the long preamble in the preamble, including:
  • Calculating an autocorrelation value of the received sequence and its shifted sequence determining a receiving moment of the receiving sequence whose autocorrelation value is greater than a set threshold as a first positioning position, and calculating a cross-correlation value of the base sequence corresponding to the long sequence corresponding to the long sequence Determining a receiving time of the receiving sequence corresponding to the peak as a second positioning position; wherein the receiving sequence is a data sequence received at different times, and an interval length between the shifting sequence and the receiving sequence is in a preamble Length of long sequence;
  • the processor 600 calculates a cross-correlation value of the base sequence corresponding to the long sequence of the received sequence, and determines a receiving moment of the received sequence corresponding to the peak as the second positioning location, including:
  • the cross-correlation value of the received sequence and the base sequence is calculated, and the reception time of the received sequence corresponding to the first cross-correlation value reaching the set threshold value is taken as the reception time of the received sequence corresponding to the peak.
  • the processor 600 determines, according to the location difference, a cyclic shift sequence that generates the long sequence, including:
  • the cyclic shift sequence corresponding to the obtained minimum difference is determined to generate a cyclic shift sequence of the long sequence.
  • the processor 600 determines to generate a cyclic shift sequence of a long sequence in the long preamble, the processor 600 is further configured to:
  • the control information includes at least one of the following information: a CP length, a scrambling code sequence number that scrambles the data, and pilot code information.
  • the processor 600 performs frequency offset estimation according to the long preamble in the preamble, including:
  • each received sequence calculate the phase of the received sequence and the determined fractional octave bias estimate a product of a bit offset value, the obtained sequence is taken as an intermediate sequence; starting position of the long preamble obtained by timing estimation is taken as a starting point, and a length from the intermediate sequence is taken as a long sequence in the preamble a subsequence of the corresponding sampling length; according to the set sliding point, a sliding sequence having a length corresponding to the effective bandwidth length of the long sequence in the preamble is respectively taken from the subsequence, and each sliding is calculated separately a cross-correlation value of a frequency domain sequence corresponding to the sequence and the base sequence;
  • An integer multiple frequency offset value is determined according to the cross-correlation value corresponding to each received sequence.
  • the processor 600 determines an integer multiple frequency offset value according to the cross-correlation value corresponding to each received sequence, including:
  • the frequency offset value corresponding to the sliding point corresponding to the maximum cross-correlation value of the set threshold is determined as the integer multiple frequency offset value according to a preset relationship between the sliding point and the frequency offset value.
  • the long sequence is an m sequence, or a Zadoff-Chu sequence.
  • embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Abstract

L'invention concerne un procédé d'estimation de synchronisation et un dispositif d'extrémité de réception, qui sont utilisés pour résoudre les problèmes de mauvaise performance et de bruit relativement élevé dans l'estimation de synchronisation existante, et de faible précision et de bruit relativement élevé du procédé d'estimation de décalage de fréquence existant. Le procédé consiste : en la réception d'une séquence de données contenant un préambule ; et selon un long préambule dans le préambule, en la réalisation d'une estimation de temporisation et/ou d'une estimation de décalage de fréquence, de manière à réaliser la synchronisation avec une extrémité d'envoi, le préambule long comprenant un préfixe, une longue séquence et un suffixe en séquence, une séquence dans le préfixe étant identique à une séquence dans la longue séquence qui est séparée du préfixe à une première distance définie, et une séquence dans le suffixe étant identique à une séquence dans la longue séquence qui est séparée du suffixe à une second distance définie.
PCT/CN2015/090385 2014-11-04 2015-09-23 Procédé d'estimation de synchronisation et dispositif d'extrémité de réception WO2016070687A1 (fr)

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