CN1848828A - Signal transmitting method and apparatus based on cyclic prefix - Google Patents
Signal transmitting method and apparatus based on cyclic prefix Download PDFInfo
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Abstract
A method for transmitting signal based on cyclic prefix includes dividing modulated symbol stream to be data blocks in different size correspondingly based on emission end transform, multiplexing said blocks to be one large data block and adding two protective intervals known by receiving end at its two ends at emission end; dividing received symbol to be a numbers of data blocks according to multiplexed number of emission end by searching protective interval at reception end; finally carry out inverse transform corresponding to emission end separately on those data blocks for obtaining transmission data.
Description
Technical field
The invention belongs to areas of information technology, relate to method for transmitting signals and the device that adopt frequency-domain equalization technology based on Cyclic Prefix.
Background technology
In wide-band mobile communication system, owing to reducing of code-element period, the signal of transmission seriously is subjected to the influence of channel multi-path.For overcoming the influence of the intersymbol interference (ISI) that multipath causes, traditional technology is to adopt the time domain channel equilibrium, as Wideband Code Division Multiple Access (WCDMA) (WCDMA) system.For wideband transmission system, when channel impulse response was longer, it is very complicated that time-domain equalizer will become.MC-CDMA (MC-CDMA) (the Shinsuke Hara of system, Ramjee Prasad. " Overview ofMulticarrier CDMA; " IEEE Communications Magazine, pp:126-133, Dec, 1997.pp:126-133.) the wideband frequency Selective Fading Channel is divided into many arrowbands flat fading subchannel, realize spread spectrum at frequency domain simultaneously, thereby improved the performance of the anti-intersymbol interference of system.Yet peak-to-average force ratio and carrier wave frequency deviation will influence the performance of MC-CDMA system.Many documents (for example: Shinsuke Hara, Ramjee Prasad. " Overview of MulticarrierCDMA, " IEEE Communications Magazine, pp:126-133, Dec, 1997.pp:126-133; NevioBenvenuto, Stefano Tomasin, " On the Comparison Between OFDM and Single CarrierModulation With a DFE Using a Frequency-Domain Feedforward Filter; " IEEE Trans onCommun., Vol.50, No.6, pp.947-955, studies show that June.2002) compared with multicarrier system, and single carrier modulation system has advantage in many aspects.Other has document (David Falconer for example, S.Lek Ariyavisitakul, Anader Benyamin-Seeyar, Brian Edison. " White paper:Frequency Domain Equalizationfor Single-Carrier Broadband Wireless Systems, " http://www.sce.carleton.ca/bbw/papers/whitepaper2.pdf; Frederick W.Vook, Timothy A.Thomas, and Kevin L.Baum. " Cyclic-prefix CDMA with Antenna Diversity, " VTC Spring 2002.IEEE 55th, Vol.2, pp:1002-1006Kevin L.Baum; Timothy A.Thomas, T.A.; FrederickW.Vook; Nangia.V. " Cyclic-prefix CDMA:an improved transmission method forbroadband DS-CDMA cellular systems; " WCNC2002.2002, Vol.1pp:183-188.) the single carrier direct sequence spread spectrum codes that has proposed employing Cyclic Prefix (CP) is divided multiple access (DS-CDMA) wideband transmission system CP-CDMA.By pended cyclic prefix on traditional WCDMA signal, the CP-CDMA system can directly apply to current 3-G (Generation Three mobile communication system) WCDMA, and the required adjustment of transmitting terminal almost can be ignored.
The frequency domain equalization that need count greatly at receiving terminal based on the single carrier transmitting system of Cyclic Prefix.This will cause receiver implementation complexity and power supply power consumption to increase.For fixing and portable reception, become slower during channel.At this moment,, carry out preequalization to transmitting, then can omit the equalizing circuit of receiving terminal, save the power supply power consumption of receiver if the impulse response of receiving terminal estimated channel is returned to transmitting terminal.
The single carrier transmitting system based on Cyclic Prefix of traditional employing frequency-domain equalization technology can improve the robustness that overcomes the intersymbol interference (ISI) that frequency selective fading is brought.The property supposed road is the The quasi-static characteristics with slow fading or nomadic decline, transmitter known channel state information (CSI), send signaling consumption by a spot of increase, channel by preequalization, makes the power of receiving terminal consumption significantly to reduce at transmitting terminal.Yet pre-equalization approach is to channel estimation errors, and especially timing error is very responsive.Traditional pre-equalization approach need rely on accurately regularly synchronously, and this often is difficult to realize under rayleigh fading channel.When there is timing error in preequalization, will there be error in the multiplexing timing position of receiving terminal time solution, thereby cause system performance degradation.
Summary of the invention
The objective of the invention is to signal transmission system, a kind of new method for transmitting signals and device based on Cyclic Prefix are provided, overcome the influence of symbol timing error preequalization based on Cyclic Prefix at existing employing pre-equalization techniques.
At transmitting terminal, at first through the symbols streams of ovennodulation based on the transmitting terminal conversion, be divided into the data block of corresponding size.The transmitting terminal conversion can be orthogonal transform (as Fourier transform and Walsh Hadamard transform etc.) or non-orthogonal transformation.Then, be a big data block with the data block after several conversion in time-domain multiplexed, and add two known segment protects of receiving terminal at interval at the two ends of this data block.This protection main effect at interval is to remove the influence that timing error causes preequalization.Then, by fast fourier transform, the transmission symbol that will comprise effective data division and protection compartment transforms to frequency domain, and after utilizing the channel condition information equilibrium that is obtained by feedback channel, by invert fast fourier transformation, time domain is returned in conversion again.At last, after the transmission symbol after the equilibrium added Cyclic Prefix, through shaping filter, up-conversion was launched then.At receiving terminal, the signal of reception at first forms baseband signal through down-conversion.Through matched filtering, after the Frequency Synchronization, regularly remove Cyclic Prefix according to symbol.By the search protection at interval, receiving symbol is pressed the multiplexing number of transmitting terminal then, be divided into several data blocks.At last, respectively these data blocks are carried out the inverse transformation corresponding with transmitting terminal, obtain the transmission data.
For achieving the above object; solution of the present invention is: a kind of based on Cyclic Prefix method for transmitting signals; adopt frequency-domain equalization technology; channel by preequalization, inserts the protection interval G that is used for timing error protection and the accurate estimation of timing error at transmitting terminal at the valid data two ends of formation transmission symbol
1And G
2, the data division of the transmission symbol before the formation preequalization.
Further, this protection interval G
1And G
2Be designed to autocorrelation performance sequence preferably; For example, pseudo random sequence.
Previous moment received signal does not have timing error, the also accurate timing of current time received signal, and by cross-correlation operation, the boundary belt G in the search data part
1And G
2Sequence obtains transmission symbol valid data position partly, extracts the transform data piece then.
Previous moment received signal does not have timing error, and there is timing error in the current time received signal, by cross-correlation operation, and the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, is judged the position of receiving symbol valid data part, extracts the transform data piece.
Previous moment received signal has timing error, and the current time received signal does not have timing error, by cross-correlation operation, and the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, is extracted the transform data piece.
Previous moment received signal has timing error, and also there is timing error in the current time received signal, by cross-correlation operation, and the G in the while search data part
1And G
2Sequence, the sequence location according to the big person's correspondence in two correlation peaks can extract the transform data piece.
A kind of single carrier transmission device based on Cyclic Prefix, it has the structure that can realize aforementioned arbitrary method.
Comprise transmitting terminal and receiving terminal, transmitting terminal the data block Multiplexing module be provided with two protections pre-equalization data frame structures at interval; Data block demultiplexing module at receiving terminal is provided with the position extracted valid data structure partly from receiving symbol that can pass through the protection intervening sequence in the search receiving symbol.
Owing to adopted such scheme, exist under the condition of timing error, compare with not adding protection system at interval, in most of signal to noise ratio scopes, the throughput of system is significantly improved.The frame structure that the present invention proposes can overcome timing error to the phase place rotation influence that preequalization causes, and implements easily, and the simultaneity factor performance is significantly improved.
Description of drawings
Fig. 1 is the transmitting terminal structural representation of an embodiment of the present invention based on cyclic prefix single carrier preequalization transmission system;
Fig. 2 is the transmission symbol data division structural representation before an embodiment of the present invention preequalization;
Fig. 3 is an embodiment of the present invention preequalization modular structure schematic diagram;
Fig. 4 is the structural representation of the transmission symbol behind an embodiment of the present invention preequalization;
Fig. 5 is the receiver structure of an embodiment of the present invention based on cyclic prefix single carrier preequalization transmission system;
Fig. 6 is that an embodiment of the present invention does not have timing error at preequalization, the receiving symbol data division structural representation that receiving terminal obtains when leading timing error is arranged;
Fig. 7 is that an embodiment of the present invention exists leading timing error at preequalization, the receiving symbol data division structural representation that obtains when receiver does not have timing error;
Fig. 8 is that an embodiment of the present invention has leading timing error at preequalization, the receiving symbol data division structural representation that receiving terminal obtains when leading timing error is also arranged;
Fig. 9-the 12nd, adopt have and protection at interval (GI) frame structure based on the BER performance comparison schematic diagram of preequalization system when the different timing error; Wherein: Fig. 9 is f
DT
D=0 o'clock errored bit curve synoptic diagram; Figure 10 is f
DT
D=0.002 o'clock errored bit curve synoptic diagram; Figure 11 is f
DT
D=0.01 o'clock errored bit curve synoptic diagram; Figure 12 is f
DT
D=0.02 o'clock errored bit curve synoptic diagram;
Figure 13-the 15th, the further analysis chart of throughput of system performance.Wherein: Figure 13 is f
DT
D=0 o'clock throughput of system schematic diagram; Figure 14 is f
DT
D=0.01 o'clock throughput of system schematic diagram; Figure 15 is f
DT
D=0.02 o'clock throughput of system schematic diagram.
Embodiment
The inventive system comprises two parts of transmitting set and wireless receiver.Now transmitting set is described in conjunction with Fig. 1: wherein,
1-1 is the data source module that desire sends, and produces by { 0} is with { random sequence that 1} forms is with { a
k, k=0,1 ..., the output sequence of K} representation module.
1-2 is a channel coding module, and the channel coding technology that is adopted can be defined as certain scheme, and as the cascaded code of RS sign indicating number and convolution code composition, Turbo code or LDPC sign indicating number also can be the adaptive coding scheme that multiple technologies are formed.Through channel coding module, input data sequence { a
k, k=0,1 ..., K} is transformed into dateout sequence { b
k, k=0,1 ..., N}.K/N is the code rate that adaptive coding and modulating scheme (AMC) can adopt.
1-3 is the symbol-modulated module.Be responsible for according to the Gray coding criterion, the planisphere that will be mapped to modulation symbol through the data sequence of chnnel coding gets on, and selected modulation system is determined by system design.Through modulation module, the data sequence { b of input
k, k=0,1 ..., N} is transformed into output symbol sequence { d
k, k=0,1 ..., M}.The N/M correspondence corresponding modulation system, and 1 is BPSK, and 2 is QPSK, and 4 is 16QAM.
1-4 is serial/parallel modular converter, and the symbol sebolic addressing after being responsible for modulate is according to the big or small piecemeal of thereafter transform block, and goes here and there also conversion operations.Through serial/parallel modular converter, incoming symbol sequence { d
k, k=0,1 ..., M} is transformed into D parallel data block { e
k, k=0,1 ..., L}, D=M/L here, L is predefined sub-piece number.
1-5 is the transmitting terminal conversion module, is responsible for each parallel data block of input is carried out quadrature or non-orthogonal transformation T, generates corresponding time-domain signal waveform.Through conversion module, the sequence of blocks of data { e of D parallel input
k, k=0,1 ..., L} is transformed into corresponding time-domain data blocks sequence { f
k, k=0,1 ..., L}, relation is each other obeyed f
k=T (e
k).
1-6 is the data block Multiplexing module after the conversion, is responsible for the data block after the process conversion of given number is multiplexed into the longer data block of length according to the precedence that produces, and constitutes the valid data part of transmission symbol.Insert at the valid data two ends then and be used for timing error protection and the accurate protection interval G that estimates of timing error
1And G
2(can be pseudo random sequence), the data division of the transmission symbol before the formation preequalization.Its internal structure is seen Fig. 2.Through data block Multiplexing module, the sequence of blocks of data { f of input
k, k=0,1,2 ... be multiplexed into the sequence { g of the data division of transmission symbol
k, k=0,1,2 ..., here, g
kRepresent a number of elements and the equirotal column vector of transmission symbol data division;
1-7 is the preequalization module, is responsible for the frequency spectrum that precorrection transmits according to the receiving terminal estimated channel, thereby makes through the frequency spectrum maintenance of the received signal after the multipath channel smooth.Its internal structure is seen Fig. 3;
{ h
kBe by responding that Return Channel obtains by the receiving terminal estimated channel.When channel variation is slow, can think that the channel response in channel response and the previous moment of current time is identical.Therefore, with the data block { g after multiplexing
kThrough with a transmission symbol in after the identical FFT conversion of counting of data division size, utilize the estimated channel frequency response, carry out ZF (ZF) or least mean-square error (MMSE) equilibrium.After passing through the IFFT conversion at last, can obtain the time domain sequences { i behind the preequalization
k, k=0,1,2 ..., here, i
kRepresent a number of elements and the equirotal column vector of transmission symbol data division;
1-8 is that Cyclic Prefix (CP) adds module, be responsible for the data to data head partly of the afterbody specific quantity (length on time domain is at least greater than channel maximum delay extension length) of the data division of copy behind the 1-7 preequalization, so that form transmission symbol jointly.Through cyclic prefix adding module, list entries { i
k, k=0,1,2 ... be transformed into complete transmission symbol sequence { j
k, k=0,1,2 ..., here, j
kRepresent a number of elements and the equirotal column vector of transmission symbol, its structure is seen Fig. 4:
1-9 is a channel signal shaping module, is responsible for carrying out filtering according to spectrum mask to sent signal waveform.Through signal shaping module, the transmission symbol sequence { j of input
k, k=0,1,2 ... be transformed into output waveform sequence { l
k, k=0,1,2 ...;
1-10 is RF radio frequency and transmitting antenna module, is responsible for baseband signal is transformed into the RF radiofrequency signal, is transmitted in the wireless channel via antenna system and goes.
The structure of wireless receiver is described in conjunction with Fig. 5: wherein,
5-1 is reception antenna and RF radio-frequency module, is responsible for the signal in the wireless channel is received, and is converted to base band and is further processed.Through reception antenna and RF radio-frequency module, wireless receiver can obtain to export baseband signal { m
k, k=0,1 ..., M+2C+P};
5-2 is the matched filtering module, is responsible for the baseband signal that receives is carried out matched filtering.Through matched filtering module, input data sequence { m
k, k=0,1 ..., M+2C+P} is transformed into dateout sequence { n
k, k=0,1 ..., M+2C+P};
When 5-3 is, synchronization module frequently, be responsible for utilizing the time domain targeting sequencing, finish timing, carrier wave and the sampling kind Frequency Synchronization function of received signal.Through synchronization module, input data sequence { n
k, k=0,1 ..., M+2C+P} is transformed into dateout sequence { o
k, k=0,1 ..., M+2C+P};
5-4 is a channel estimation module, is responsible in time domain channel response being estimated.Through channel estimation module, can obtain the estimated value { h of channel response
k, k=0,1,2 ... L-1}, here, L is the maximum delay of time-domain response.Simultaneously, the estimated channel response is transferred to transmitting terminal and is used for preequalization by Return Channel;
5-5 is responsible for the CP that deletion absorbs the intersymbol interference composition for removing Cyclic Prefix (CP) module.Through removing cyclic prefix module, input data sequence { o
k, k=0,1 ..., M+2C+P} is transformed into output block sequence { p
k, k=0,1 ..., M+2C}, here, p
kRepresent a number of elements and the equirotal column vector of transmission symbol data division;
5-6 is the data block demultiplexing module, is responsible for extracted valid data part from the receiving symbol of removing Cyclic Prefix, and it is demultiplexed into and the identical sequence of blocks of data of proper friendship/non-orthogonal transformation (1-5 module among Fig. 1) size of transmitting set.The extracted valid data part can be finished by the position of the protection intervening sequence in the search receiving symbol from receiving symbol.Suppose the channel perfect estimation, because the influence of receiving terminal timing error makes current received signal following several situation can occur:
First kind of situation: previous moment received signal does not have timing error, that is the channel impulse response that is used for preequalization does not have timing offset, the yet accurate timing of current time received signal.At this moment, after the symbol of reception was removed Cyclic Prefix, the data division of acquisition was identical with preequalization transmission data (data division among Fig. 2) before.At this moment, can be by the boundary belt G in the search data part
1And G
2Sequence obtains transmission symbol valid data position partly, extracts the transform data piece then.
Second kind of situation: previous moment received signal does not have timing error, and there is timing error in the current time received signal.At this moment, remain on G as long as receive timing error (lag or lead)
1Or G
2Within, just can be by the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, is judged the position of receiving symbol valid data part, thereby extracts the transform data piece.After Figure 6 shows that the symbol that receives when having leading timing error is removed Cyclic Prefix, the data division of acquisition as.
The third situation: previous moment received signal has timing error, and the current time received signal does not have timing error.At this moment, because the influence of preequalization timing error, after receiving symbol was removed Cyclic Prefix, the sampled value sequence of the data division in the receiving symbol produced cyclic shift.The cyclic shift amount depends on the preequalization timing error, and the cyclic shift direction depends on that timing is in advance or lags behind.Figure 7 shows that the data division that obtains when having the leading timing error of preequalization, G among the figure
1=[G
1' G
1"].
As seen from Figure 7, as long as the preequalization timing error remains on G
1And G
2Within, the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, can correctly be extracted the transform data piece.
The 4th kind of situation: previous moment received signal has timing error, and also there is timing error in the current time received signal.If timing error is within CP, after this moment, receiving symbol was removed Cyclic Prefix, the receiving symbol of acquisition received the influence of timing error in addition except the cyclic shift that causes of preequalization timing error.But, as long as the preequalization timing error remains on G with reception timing error sum
1And G
2Within, by the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, can correctly be extracted the transform data piece.Figure 8 shows that preequalization has leading timing error, the receiving symbol data division that receiving terminal obtains when leading timing error is also arranged.
Through data block demultiplexing module, input block sequence { p
k, k=0,1 ..., M+2C} is transformed into output block sequence { q
k, k=0,1 ..., L}, here, q
kRepresent a number of elements and the equirotal column vector of transmitter terminal quadrature/non-orthogonal transformation;
5-7 is and the equirotal inverse transform module of transmitter terminal quadrature/non-orthogonal transformation to carry out the anti-operation of answering with the transmitter terminal transfer pair.Through inverse transform module, input block sequence { q
k, k=0,1 ..., L} is transformed into output block sequence { s
k, k=0,1 ..., L}, s
kRepresent the column vector that number of elements is the same with transform size;
5-8 is parallel/serial conversion module, is responsible for the parallel data block sequence transformation of input is become the dateout sequence of serial.Through parallel/serial conversion module, the sequence of blocks of data { s of input
k, k=0,1 ..., L} is transformed into dateout sequence { t
k, k=0,1 ..., M};
5-9 is the symbol demodulation module, is responsible for according to the Gray coding rule of transmitter terminal the data sequence of importing being demodulated to the corresponding digital sequence.If the channel decoding algorithm of be about to carrying out will be based on the hard decision input information, then Shu Chu hard information Serial No. is { 0} and the { random alignment of 1}, otherwise the symbol demodulation module will provide accordingly based on the soft message digit sequence of counting bit quantization.Through symbol demodulation module, the data sequence { t of input
k, k=0,1 ..., M} is transformed into the digital information { u of output
k, k=0,1 ..., N};
5-10 is the channel decoding module, is responsible for carrying out corresponding channel decoding algorithm.Through channel decoding module, input digit sequence { u
k, k=0,1 ..., N} is transformed into output Serial No. { v
k, k=0,1 ..., K};
The data sequence that 5-11 receives for judgement is with { v
k, k=0,1 ..., K} represents.
Set the simulated environment parameter:
Channel width: 10M, channel model: SUI-4, chnnel coding: convolution code (coding: code check 1/2, constraint length 7, generator polynomial [171,133], decoding: 8 grades of 3bit quantize Viterbi soft decoding, decoding depth 34).
The initialization system simulation parameter:
The transmitting terminal conversion: 64 IFFT, frequency domain equalization is counted: 1024, circulating prefix-length: 64, data block length: 960, protection gap length (G1+G2): 64, modulation system: QPSK, frequency domain pre-equalisation method: least mean-square error (MMSE) equalizer.
Simulation result:
Fig. 9-12 compared adopt have and protection at interval (GI) frame structure based on the BER performance of preequalization system when the different timing error.F among the figure
DThe expression maximum doppler frequency, T
DBe actual channel and the time delays of estimating channel, timing error (TimingOffse) is defined as the original position of valid data part in the receiving symbol and the deviation between the ideal position.As seen from the figure, the scheme of proposition can significantly be improved systematic function.Employing added protection at interval under the systematic function of frame structure and the desirable timing estimation performance very approaching.
Compare with traditional scheme, by all adding protection at the two ends of frame at interval, the present invention has stronger robustness to timing error.Yet the redundancy that two protections of interpolation bring at interval will reduce spectrum efficiency.
Figure 17-19 has further analyzed the throughput of system performance.As seen from the figure, when timing error is 3 or 5 symbols, corresponding signal to noise ratio is less than 9 or during 12dB respectively, and this case can provide higher throughput of system.
The present invention not needing to be particularly suitable for time division duplex (TDD) pattern of feeding back channel state information applicable to quasistatic or slow fading channel.
Though below mainly be that single carrier transmitting system is introduced method of the present invention, but the person skilled in the art obviously can easily make various modifications to these explanations, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (8)
1, a kind of based on Cyclic Prefix method for transmitting signals; adopt frequency-domain equalization technology; channel, be is characterized in that by preequalization at transmitting terminal: insert the protection interval G that is used for timing error protection and the accurate estimation of timing error at the valid data two ends of formation transmission symbol
1And G
2, the data division of the transmission symbol before the formation preequalization.
2, according to claim 1 based on Cyclic Prefix method for transmitting signals, it is characterized in that: this protection is G at interval
1And G
2Be autocorrelation sequence preferably.
3, according to claim 1 and 2 based on Cyclic Prefix method for transmitting signals, it is characterized in that: previous moment received signal does not have timing error, the also accurate timing of current time received signal is by the boundary belt G in the search data part
1And G
2Sequence obtains transmission symbol valid data position partly, extracts the transform data piece then.
4, according to claim 1 and 2 based on Cyclic Prefix method for transmitting signals, it is characterized in that: previous moment received signal does not have timing error, and there is timing error in the current time received signal, by the G in the while search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, is judged the position of receiving symbol valid data part, extracts the transform data piece.
5, according to claim 1 and 2 based on Cyclic Prefix method for transmitting signals, it is characterized in that: previous moment received signal has timing error, and the current time received signal does not have timing error, simultaneously the G in the search data part
1And G
2Sequence according to the sequence location of the big person's correspondence in two correlation peaks, is extracted the transform data piece.
6, according to claim 1 and 2 based on Cyclic Prefix method for transmitting signals, it is characterized in that: previous moment received signal has timing error, and also there is timing error in the current time received signal, by the G in the while search data part
1And G
2Sequence, the sequence location according to the big person's correspondence in two correlation peaks can extract the transform data piece.
7, a kind of single carrier transmission device based on Cyclic Prefix, it is characterized in that: it has the structure that can realize arbitrary described method among the claim 1-6.
8, the single carrier transmission device based on Cyclic Prefix according to claim 7 comprises transmitting terminal and receiving terminal, it is characterized in that: transmitting terminal the data block Multiplexing module be provided with two protections pre-equalization data frame structures at interval; Being provided with in the data block demultiplexing module of receiving terminal can be by the structure of position extracted valid data part from receiving symbol of sequence preferably of the autocorrelation in the search receiving symbol.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655420A (en) * | 2011-03-02 | 2012-09-05 | 中兴通讯股份有限公司 | Subsection frequency domain method and device for realizing multi-diameter search |
| WO2015192681A1 (en) * | 2014-06-17 | 2015-12-23 | 华为技术有限公司 | Method and device for synchronizing data transmission |
| CN109478946A (en) * | 2016-08-03 | 2019-03-15 | Oppo广东移动通信有限公司 | The method and apparatus for transmitting data |
-
2005
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655420A (en) * | 2011-03-02 | 2012-09-05 | 中兴通讯股份有限公司 | Subsection frequency domain method and device for realizing multi-diameter search |
| WO2012116527A1 (en) * | 2011-03-02 | 2012-09-07 | 中兴通讯股份有限公司 | Segmented frequency domain method and device for realizing multi-path search |
| CN102655420B (en) * | 2011-03-02 | 2014-11-05 | 中兴通讯股份有限公司 | Subsection frequency domain method and device for realizing multi-diameter search |
| WO2015192681A1 (en) * | 2014-06-17 | 2015-12-23 | 华为技术有限公司 | Method and device for synchronizing data transmission |
| CN105227287A (en) * | 2014-06-17 | 2016-01-06 | 华为技术有限公司 | Data transmission synchronization method and device |
| CN105227287B (en) * | 2014-06-17 | 2018-12-25 | 华为技术有限公司 | data transmission synchronization method and device |
| CN109478946A (en) * | 2016-08-03 | 2019-03-15 | Oppo广东移动通信有限公司 | The method and apparatus for transmitting data |
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| CN100536449C (en) | 2009-09-02 |
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