CN101119352A - OFDM based signal receiving and dispatching method and apparatus - Google Patents
OFDM based signal receiving and dispatching method and apparatus Download PDFInfo
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- CN101119352A CN101119352A CNA2006101713410A CN200610171341A CN101119352A CN 101119352 A CN101119352 A CN 101119352A CN A2006101713410 A CNA2006101713410 A CN A2006101713410A CN 200610171341 A CN200610171341 A CN 200610171341A CN 101119352 A CN101119352 A CN 101119352A
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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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
- H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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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
- H04L27/2626—Arrangements specific to the transmitter only
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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
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Abstract
The present invention relates to a mobile communication field, disclosing a signal sending and receiving method and equipment based on OFDM, aiming to increase the detection performance of the signal code when the frequency-domain signal of the signal sequence is incapable of being completely sent. In the invention, after being interleaved or scrambled, the sequence of the waiting signal code has a discrete Fourier transform DFT transform, making the partly result of the DFT transform is mapped to the subcarrier of the OFDM symbol, and then sent after being modulated by the OFDM; the receiver releases the interleaving and the scrambling to the received signal, and then discriminates the sequence of the signal mode sent from the sender through correlation detection.
Description
Technical field
The present invention relates to wireless communication field, particularly based on the signal transmission technology of OFDM.
Background technology
In the last few years, be subjected to people's extensive concern for the multi-carrier transmission technology of representative with OFDM (Orthogonal Frequency Division Multiplexing is called for short " OFDM ").The multi-carrier transmission technology is decomposed into several independently sub data flows to data flow, and under the constant situation of total message transmission rate, each sub data flow will have much lower bit rate.The low rate multimode symbol that forms with such low bit rate removes to modulate corresponding subcarrier, has just constituted the transmission system that a plurality of low rate symbol parallels send.
OFDM is as a kind of multi-carrier digital modulation technique, and data to be transmitted as frequency domain information, is modulated to time-domain signal with it to data after encoded and transmits at frequency domain.Then carry out inverse process demodulation, the data that obtain transmitting at receiving terminal.The modulation and demodulation of ofdm system can be respectively by contrary discrete Fourier transform (DFT) (Inverse Discrete Fourier Transform, be called for short " IDFT ") and discrete Fourier transform (DFT) (Discrete Fourier Transform, abbreviation " DFT ") replace.At transmitting terminal, can be the frequency domain data sign reversing time domain data symbol by N point IDFT computing, through after the carrier modulation, send in the channel.At receiving terminal, received signal is carried out coherent demodulation, then baseband signal is carried out N point DFT computing, the data symbol that can obtain to send.In actual applications, IDFT/DFT adopts contrary fast fourier transform (Inverse Fast Fourier Transform is called for short " IFFT ") and fast fourier transform (Fast Fourier Transform is called for short " FFT ") to realize.The employing of FFT technology makes the complexity of OFDMA system reduce greatly, add the high-performance information processing device, such as programmable logic device (Programmable Logic Device, abbreviation " PLD "), digital signal processor (Digital Signal Processor, abbreviation " DSP "), microprocessor (Micro Processor, abbreviation " μ P ") etc. development and application makes the realization of ofdm system be more prone to, and becomes most widely used a kind of multi-carrier transmission scheme.
Adopt in the scene of OFDM technology at some, orthogonal code sequence need be modulated on the OFDM symbol as information bit and transmit.Third generation partner program 2 (3rd Generation PartnershipProject 2, being called for short " 3GPP2 ") superframe in the forward physical channels of AIE project (Air Interface Evolution is called for short " AIE ") leading promptly need to modulate the back according to orthogonal code sequence and transmit on the OFDM symbol.Orthogonal code sequence comprises Walsh sign indicating number sequence, DFT sign indicating number sequence or the like.
Specifically, the forward physical channels of 3GPP2AIE is made of superframe, and each superframe has a preamble (leading), is used to carry out forward direction synchronization acquistion, identification sub-district, broadcast system parameter etc.Preamble is made up of 8 OFDM symbols, and wherein back 3 OFDM symbols are called TDM1, TDM2, TDM3.Wherein TDM1 is used for the transmitting synchronous acquisition sequence.And TDM2, TDM3 transmission Walsh sign indicating number sequence is used for discerning different sub-districts, transmits some systematic bits etc.Different districts can identify information such as distinguishing cell id by selecting different Walsh sign indicating numbers.
For the ofdm system of 5MHz, the counting of IFFT of adopting during the OFDM modulation is 512 points, and the length of the Walsh sign indicating number sequence that TDM2 need transmit is 512.In the prior art, earlier be that 512 Walsh sign indicating number sequence is made 512 DFT and is transformed to frequency-region signal with length, be mapped on the subcarrier that is modulated to the OFDM symbol, as shown in Figure 1 by subcarrier then.For the ofdm system of certain bandwidth, the both sides of frequency band need keep the protection subcarrier of some usually, leak to prevent the frequency spectrum that sends signal, disturb other frequency bands.If protection subcarrier number is Ng, then, useful subcarrier is 512-Ng.That is to say that the Walsh sign indicating number sequence spectrum signal of finishing 512 DFT can only be mapped on 512-Ng effective subcarrier, need can be mapped on the OFDM symbol at Ng/2 point of frequency spectrum two ends difference brachymemma when mapping.The frequency-region signal of Walsh sign indicating number sequence through OFDM modulation (IFFT conversion), is gone out by antenna transmission after being mapped on the subcarrier of OFDM symbol.
Receiving terminal carries out coherent detection to the time-domain signal that receives, and judges the sequence number of the Walsh sign indicating number that is sent, to discern different sub-districts.
In actual applications, there is following problem in prior art: at receiving terminal, the false drop rate that is mapped in the Walsh sign indicating number on the OFDM subcarrier is higher.
Cause the main cause of this situation to be; because the influence of protection subcarrier; the frequency-region signal of finishing the Walsh sign indicating number sequence after the DFT conversion is understood some frequency spectrum and is cut out when carrying out the subcarrier mapping; influenced the frequency domain integrality of Walsh sign indicating number; and this part frequency spectrum often may carry the Walsh sign indicating number and detect required topmost characteristic; lack this part frequency spectrum and make the performance of receiving terminal detection reduce greatly, false drop rate is higher.
Summary of the invention
The technical problem underlying that each execution mode of the present invention will solve provides a kind of signal transmit-receive method and equipment based on OFDM, when making the frequency-region signal of signal code sequence intactly to be sent, improves the performance that signal code detects.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of signaling method based on OFDM, comprise following steps:
To sent the signal code sequence interweave or scrambling after carry out discrete Fourier transform (DFT) DFT conversion, the partial results of this DFT conversion is mapped on the subcarrier of OFDM symbol, through OFDM modulation back transmission.
Embodiments of the present invention also provide a kind of signal acceptance method based on OFDM, comprise following steps:
Carry out deinterleaving or descrambling to the received signal, judge the sequence number of number that transmitting terminal is posted a letter again by coherent detection.
Embodiments of the present invention also provide a kind of apparatus for transmitting signal based on OFDM, comprise:
Interweave or the unit of scrambling to sent the signal code sequence;
To through the unit that interweaves or the sequence of scrambling is carried out the DFT conversion;
The partial results of DFT conversion is mapped to the unit of the subcarrier of OFDM symbol;
Subcarrier to the OFDM symbol carries out the unit that OFDM modulation back sends.
Embodiments of the present invention also provide a kind of signal receiver based on OFDM, comprise:
Receive the unit of ofdm signal;
Carry out the unit of deinterleaving or descrambling to the received signal;
Signal through deinterleaving or descrambling is carried out coherent detection and judges the unit of the sequence number of corresponding signal sign indicating number.
Each execution mode of the present invention compared with prior art, the main distinction and effect thereof are:
If can't all frequency-region signals that DFT produces be sent at the subcarrier of OFDM symbol, then before DFT, interweave or scrambling to sent signal code earlier.By interweaving or scrambling, the frequency spectrum that can make signal code is " smooth " more, and the distortion that produces when losing the part frequency-region signal is less, thereby can be identified comparatively exactly.
Orthogonal code normally has certain rule, for example Walsh is a symmetry or antisymmetric, so frequency-region signal comparison rule that orthogonal code produces after the DFT conversion, some key characters may only appear on a few frequency-region signal, if these frequency-region signals can not send, then can lose these key characters, rectify really identification thereby can't be received.To sent orthogonal code interweave or scrambling after advance DFT again, whole frequency-region signal seems and " smooth " that key character is spread to entire spectrum in other words, even lose the part frequency-region signal this moment, also only be equivalent to introduce some noises, can not cause receiving terminal can't discern fully.
Having only the part frequency-region signal is more common by the situation that the subcarrier of OFDM symbol sends; when for example boundary belt being arranged, the subcarrier at boundary belt place can be by zero setting, and the frequency-region signal of relevant position has not just had; when and for example needing to punch, the locational frequency-region signal that is perforated also can be lost.By interweaving or scrambling to sent orthogonal code earlier before DFT, the orthogonal code that can improve receiving terminal when needs are established boundary belt or punching effectively detects performance.
Description of drawings
Fig. 1 is the operation chart of transmitting terminal in the prior art;
Fig. 2 is the signaling method flow chart based on OFDM according to first embodiment of the invention;
Fig. 3 is the operation chart based on the transmitting terminal in the signaling method of OFDM according to first embodiment of the invention;
Fig. 4 is the operation chart based on the transmitting terminal in the signaling method of OFDM according to second embodiment of the invention;
Fig. 5 is the simulation performance curve that the sending method of the one the second execution modes according to the present invention obtains;
Fig. 6 comprises the equipment structure chart that interleave unit and boundary belt are provided with module in the apparatus for transmitting signal based on OFDM according to four embodiment of the invention;
Fig. 7 is the equipment structure chart that comprises interleave unit and punching module in the apparatus for transmitting signal based on OFDM according to four embodiment of the invention;
Fig. 8 comprises the equipment structure chart that scrambling unit and boundary belt are provided with module in the apparatus for transmitting signal based on OFDM according to four embodiment of the invention;
Fig. 9 is the equipment structure chart that comprises scrambling unit and punching module in the apparatus for transmitting signal based on OFDM according to four embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
In each execution mode of the present invention, at first interweave or scrambling to sent the signal code sequence, carry out the DFT conversion afterwards again, the result that the DFT conversion is obtained is mapped on the subcarrier of OFDM symbol, sends after the OFDM modulation.
The present invention is better to the more violent situation signal code sequence effect of frequency spectrum " fluctuating ", and for example orthogonal code sequence can certainly be other signal code sequence, as GCL sequence etc.Following execution mode is that example describes with the orthogonal code sequence, but the present invention is not limited to orthogonal code sequence.
Because orthogonal code is first by interweaving or the scrambling operation before the DFT conversion, the frequency-region signal that makes orthogonal code produce after the DFT conversion can be too irregular, some key characters are spread to entire spectrum, be not concentrated on a few frequency-region signal, even thereby can't all frequency-region signals that DFT produces be sent by the subcarrier of OFDM symbol, can not lose these key characters yet, make receiving terminal correctly to discern because lacking a few frequency-region signal.
First embodiment of the invention relates to a kind of signal sending and receiving methods based on OFDM, at transmitting terminal as shown in Figure 2, in step 210, at first interweaves to sent orthogonal code sequence.This orthogonal code sequence to be sent can be a Walsh sign indicating number sequence, be generally used for transmitting the control information in cell system information or the control channel, as TDM2 and the TDM3 in AIE system forward physical channel leading, also can be other orthogonal code sequence or the more violent signal code sequence of other frequency spectrum " fluctuating ".
Then enter step 220, the Walsh sign indicating number sequence after interweaving is carried out the DFT conversion.Because orthogonal code normally has certain rule, for example Walsh is a symmetry or antisymmetric, so frequency-region signal comparison rule that orthogonal code produces after the DFT conversion, some key characters may only appear on a few frequency-region signal, if these frequency-region signals can not send, then can lose these key characters, rectify really identification thereby can't be received.By before the DFT conversion, at first Walsh sign indicating number sequence being interweaved, make this Walsh sign indicating number sequence key character be spread to entire spectrum, even lose the part frequency-region signal this moment, also only be equivalent to introduce some noises, can not cause receiving terminal can't discern fully.
Then enter step 230, whole results of DFT conversion are mapped on the subcarrier of OFDM symbol.
Then enter step 240, the result of the DFT conversion of shining upon on the subcarrier as boundary belt is set to zero.
Then enter step 250, the OFDM symbol after the mapping is carried out OFDM modulation after, send by sky alignment receiving terminal.
For example; in at the forward channel of the ofdm system (512 IFFT) of 5MHz bandwidth leading; TDM2 or TDM3 need send the Walsh sign indicating number sequence of 512 bits; as shown in Figure 3; length is after 512 Walsh sign indicating number sequence interweaves through interleaver, through 512 DFT conversion, to become frequency-region signal again; be mapped on the OFDM symbol by subcarrier, wherein protect the subcarrier zero setting of subcarrier correspondence.After the OFDM modulation, go out by antenna transmission.
At receiving terminal, carry out deinterleaving at first to the received signal, send out the sequence number of Walsh sign indicating number again by coherent detection judgement transmitting terminal.
The second embodiment of the invention and first execution mode are roughly the same, and its difference only is, in the first embodiment, before carrying out the DFT conversion, at first interweaves to sent orthogonal code sequence; And in the present embodiment, before carrying out the DFT conversion, at first carry out scrambling to sent orthogonal code sequence.By scrambling, equally can be so that some key characters of orthogonal code are spread to entire spectrum, be not concentrated on a few frequency-region signal, even thereby can't all frequency-region signals that DFT produces be sent by the subcarrier of OFDM symbol, can not lose these key characters yet, make receiving terminal can't correctly discern this orthogonal code sequence because lacking a few frequency-region signal.
Object lesson as shown in Figure 4; length is that 512 Walsh sign indicating number sequence is at first passed through the scrambler scrambling, again through 512 DFT conversion, becomes frequency-region signal afterwards; and be mapped to by subcarrier and be modulated on the OFDM symbol, wherein protect the subcarrier zero setting of subcarrier correspondence.After the OFDM modulation, send by sky alignment receiving terminal.
At receiving terminal, carry out descrambling at first to the received signal, send out the sequence number of Walsh sign indicating number again by coherent detection judgement transmitting terminal.
Shown in Fig. 5 is the simulation performance curve that the sending method after two kinds of improvement obtains in first execution mode and second execution mode.Wherein indicating circular curve is the performance curve of prior art, floor effect (Floor) occurs in the place of-10dB, and Packet Error Ratio is 5 * 10
-2The curve that indicates rhombus is to add the curve that interweaves, and floor effect occurs in the place of-8dB, and Packet Error Ratio is 2 * 10
-3The curve that indicates triangle is the curve of scrambled code.As seen, based on the signaling method of OFDM, make the power that is detected as of receiving terminal increase greatly among employing the present invention.
The third embodiment of the invention and the one the second execution modes are roughly the same, and its difference only is, in the one the second execution modes, owing to existing the OFDM boundary belt to make transmitting terminal whole results of DFT conversion can't be mapped on the subcarrier of OFDM symbol; And in the present embodiment, need the DFT transformation results be punched, remove the DFT transformation results of punch position.
The OFDM boundary belt is identical with being provided with; punching can influence the frequency domain integrality of Walsh sign indicating number to be sent equally; can't discern this Walsh sign indicating number sequence fully for fear of receiving terminal; equally need be before carrying out the DFT conversion; interweave or scrambling to sent Walsh sign indicating number sequence earlier, make some key characters of orthogonal code be spread to entire spectrum.Then again to interweave or scrambling after Walsh sign indicating number sequence carry out the DFT conversion, the DFT transformation results is punched, the remaining DFT transformation results in punching back is mapped on effective subcarrier of OFDM symbol, send to receiving terminal through OFDM modulation back.For example, 512 transformation results are arranged after the DFT conversion, wherein 32 assigned addresses are punched (as be numbered the position of 16n, n is 0 to 31 integer), remain 512-32=480 transformation results.Again these 480 transformation results are mapped on 480 effective subcarriers of OFDM symbol (the OFDM symbol has 512 subcarriers originally, remove both sides protection subcarrier and zero-frequency then also have 480 effective subcarriers) respectively, send to receiving terminal through OFDM modulation back.By interweaving or scrambling to sent orthogonal code sequence, Walsh sign indicating number sequence most important characteristic is not concentrated on a few frequency-region signal, though receiving terminal can't be received complete Walsh sign indicating number sequence, but because its most important characteristic does not lose fully, only be equivalent in the signal that receives, introduce some noises, can not cause receiving terminal can't discern this Walsh sign indicating number sequence fully, improve the detection efficiency of receiving terminal.
Four embodiment of the invention relates to a kind of apparatus for transmitting signal based on OFDM, comprises: interleave unit is used for interweaving to sent orthogonal code sequence, as Fig. 6 or shown in Figure 7, or scrambling unit, be used for carrying out scrambling, as Fig. 8 or shown in Figure 9 to sent orthogonal code sequence; Also comprise the DFT converter unit, be used for through interweaving or the sequence of scrambling is carried out the DFT conversion; The subcarrier map unit is used for the partial results of DFT conversion is mapped to the subcarrier of OFDM symbol; The OFDM modulating unit carries out OFDM modulation back to the subcarrier of OFDM symbol and sends to receiving terminal.Orthogonal code sequence to be sent wherein can be a Walsh sign indicating number sequence, be generally used for transmitting the control information in cell system information or the control channel, as TDM2 and the TDM3 in AIE system forward physical channel leading, also can be other orthogonal code sequence or the more violent signal code sequence of other frequency spectrum " fluctuating ".
In addition, the subcarrier map unit also further comprises: first mapping block is mapped to whole results of DFT conversion on the subcarrier of OFDM symbol; Also comprise boundary belt module is set, be used for being set to zero as the result of the DFT conversion on the subcarrier of boundary belt; As Fig. 6 or shown in Figure 8.
Perhaps, this subcarrier map unit further comprises: the punching module, be used for the DFT transformation results is punched, and remove the DFT transformation results of punch position; Second mapping block is used for the remaining DFT transformation results in punching back is mapped to effective subcarrier of OFDM symbol; As Fig. 7 or shown in Figure 9.
By interweaving or scrambling to sent orthogonal code sequence; make Walsh sign indicating number sequence most important characteristic not be concentrated on a few frequency-region signal; even the subcarrier at boundary belt place is by zero setting; the frequency-region signal disappearance of relevant position; or through punching; the locational frequency-region signal that is perforated is lost; Walsh sign indicating number sequence most important characteristic can not lose fully yet; only be equivalent in the signal that receives, introduce some noises; can not cause receiving terminal can't discern this Walsh sign indicating number sequence fully, improve the detection efficiency of receiving terminal.
Fifth embodiment of the invention relates to a kind of signal receiver based on OFDM, comprises: the unit that receives ofdm signal; Carry out the unit of deinterleaving or descrambling to the received signal; Signal through deinterleaving or descrambling is carried out coherent detection and judges the unit of the sequence number of respective orthogonal code.Though receiving equipment can't be received complete Walsh sign indicating number sequence, but owing to when sending, Walsh sign indicating number sequence has been carried out interweaving or scrambling, Walsh sign indicating number sequence most important characteristic is not concentrated on a few frequency-region signal, even it is wrong therefore having several in the frequency-region signal that receives, can not lose the most important characteristic of this Walsh sign indicating number sequence fully yet, only be equivalent in the signal that receives, introduce some noises, can not cause receiving equipment can't discern this Walsh sign indicating number sequence fully, improve the detection efficiency of receiving equipment.
In the embodiments of the present invention, DFT all can be realized by fast Fourier transform (Fast FourierTransform is called for short " FFT ").
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (13)
1. the signaling method based on OFDM is characterized in that, comprises following steps:
To sent the signal code sequence interweave or scrambling after carry out discrete Fourier transform (DFT) DFT conversion, the partial results of this DFT conversion is mapped on the subcarrier of OFDM symbol, through OFDM modulation back transmission.
2. the signaling method based on OFDM according to claim 1 is characterized in that, is mapped on the subcarrier of OFDM symbol by the partial results of following steps with described DFT conversion:
Whole results of described DFT conversion are mapped on the subcarrier of OFDM symbol;
Result as the described DFT conversion on the subcarrier of boundary belt is set to zero.
3. the signaling method based on OFDM according to claim 1 is characterized in that, is mapped on the subcarrier of OFDM symbol by the partial results of following steps with described DFT conversion:
Described DFT transformation results is punched, remove the DFT transformation results of punch position;
The remaining described DFT transformation results in described punching back is mapped on effective subcarrier of OFDM symbol.
4. according to each described signaling method in the claim 1 to 3, it is characterized in that described signal code sequence is an orthogonal code sequence based on OFDM.
5. the signaling method based on OFDM according to claim 4 is characterized in that, described orthogonal code sequence comprises Walsh sign indicating number sequence.
6. the signaling method based on OFDM according to claim 4 is characterized in that described orthogonal code sequence to be sent is used for transmitting the control information of cell system information or control channel.
7. the signaling method based on OFDM according to claim 6 is characterized in that, the cell system information that described orthogonal code sequence to be sent is transmitted comprises: TDM2 and TDM3 in AIE system forward physical channel leading.
8. the signal acceptance method based on OFDM is characterized in that, comprises following steps:
Carry out deinterleaving or descrambling to the received signal, judge the sequence number of number that transmitting terminal is posted a letter again by coherent detection.
9. the apparatus for transmitting signal based on OFDM is characterized in that, comprises:
Interweave or the unit of scrambling to sent the signal code sequence;
To through the unit that interweaves or the sequence of scrambling is carried out the DFT conversion;
The partial results of DFT conversion is mapped to the unit of the subcarrier of OFDM symbol;
Subcarrier to the OFDM symbol carries out the unit that OFDM modulation back sends.
10. the apparatus for transmitting signal based on OFDM according to claim 9 is characterized in that, the unit that described partial results with the DFT conversion is mapped to the subcarrier of OFDM symbol further comprises:
Whole results of described DFT conversion are mapped to the module on the subcarrier of OFDM symbol;
Result as the described DFT conversion on the subcarrier of boundary belt is set to zero module.
11. the apparatus for transmitting signal based on OFDM according to claim 9 is characterized in that, the unit that described partial results with the DFT conversion is mapped to the subcarrier of OFDM symbol further comprises:
Described DFT transformation results is punched, remove the module of the DFT transformation results of punch position;
The remaining described DFT transformation results in described punching back is mapped to the module on effective subcarrier of OFDM symbol.
12. the apparatus for transmitting signal based on OFDM according to claim 9 is characterized in that, described signal code sequence is an orthogonal code sequence.
13. the signal receiver based on OFDM is characterized in that, comprises:
Receive the unit of ofdm signal;
Carry out the unit of deinterleaving or descrambling to the received signal;
Signal through deinterleaving or descrambling is carried out coherent detection and judges the unit of the sequence number of corresponding signal sign indicating number.
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| CNA2006101713410A CN101119352A (en) | 2006-12-19 | 2006-12-19 | OFDM based signal receiving and dispatching method and apparatus |
| PCT/CN2007/071235 WO2008074254A1 (en) | 2006-12-19 | 2007-12-14 | A signal receiving and transmitting method and device based on ofdm |
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| CNA2006101713410A CN101119352A (en) | 2006-12-19 | 2006-12-19 | OFDM based signal receiving and dispatching method and apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478520B (en) * | 2008-12-15 | 2011-08-03 | 北京创毅视讯科技有限公司 | Descramble method and apparatus |
| WO2014063462A1 (en) * | 2012-10-26 | 2014-05-01 | 华为技术有限公司 | Method and device for interleaving processing in wireless local area network (wlan) system |
| CN106789815A (en) * | 2015-02-12 | 2017-05-31 | 上海数字电视国家工程研究中心有限公司 | The method of reseptance of leading symbol |
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| CN1549472A (en) * | 2003-05-07 | 2004-11-24 | 华为技术有限公司 | Modulating and demodulating apparatus for orthogonal frequency division multiplexing system |
| KR100647987B1 (en) * | 2005-01-27 | 2006-11-23 | 삼성전자주식회사 | Method for interleaving in OFDM system |
| KR101100199B1 (en) * | 2005-05-02 | 2011-12-28 | 엘지전자 주식회사 | method of band limiting for IFDMA commnuication system |
| CN1725749A (en) * | 2005-07-12 | 2006-01-25 | 南开大学 | Communication system with very-high frequency and ultrahigh frequency band high frequency band availability |
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2006
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478520B (en) * | 2008-12-15 | 2011-08-03 | 北京创毅视讯科技有限公司 | Descramble method and apparatus |
| WO2014063462A1 (en) * | 2012-10-26 | 2014-05-01 | 华为技术有限公司 | Method and device for interleaving processing in wireless local area network (wlan) system |
| US9337957B2 (en) | 2012-10-26 | 2016-05-10 | Huawei Technologies Co., Ltd. | Method and device for interleaving processing in a WLAN system |
| CN106789815A (en) * | 2015-02-12 | 2017-05-31 | 上海数字电视国家工程研究中心有限公司 | The method of reseptance of leading symbol |
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