CN101453257A - Differential space-time transmission diversity system in multi-carrier modulation system and implementing method - Google Patents

Differential space-time transmission diversity system in multi-carrier modulation system and implementing method Download PDF

Info

Publication number
CN101453257A
CN101453257A CNA2007101786079A CN200710178607A CN101453257A CN 101453257 A CN101453257 A CN 101453257A CN A2007101786079 A CNA2007101786079 A CN A2007101786079A CN 200710178607 A CN200710178607 A CN 200710178607A CN 101453257 A CN101453257 A CN 101453257A
Authority
CN
China
Prior art keywords
time
signal
sent
differential space
parallel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007101786079A
Other languages
Chinese (zh)
Inventor
李继龙
施玉海
杨明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Academy of Broadcasting Science Research Institute
Academy of Broadcasting Science of SAPPRFT
Original Assignee
Academy of Broadcasting Science of SAPPRFT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Academy of Broadcasting Science of SAPPRFT filed Critical Academy of Broadcasting Science of SAPPRFT
Priority to CNA2007101786079A priority Critical patent/CN101453257A/en
Publication of CN101453257A publication Critical patent/CN101453257A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Radio Transmission System (AREA)

Abstract

The invention provides a system for a differential space time transmit diversity in a multicarrier modulation system and an implement method thereof, wherein the implement method comprises the following steps: A, a modulation signal is subjected to differential coding by a differential space time coder and is output to two paths; and B, one path of signal in the step A passes through an OFDM modulator and a cyclic prefix insertion device and is transmitted by an antenna, the other path of coding signal passes through another OFDM modulator and is transmitted to a time delay delta unit, after the signal is subjected to cyclic time delay with delta delayed time, the signal is transmitted to the cyclic prefix insertion device, inserted with cyclic prefix and transmitted by an antenna. On the premise of ensuring the transmission speed, the system can obtain high space time diversity gain and effectively improve system performance.

Description

Differential space-time transmission diversity system and implementation method in a kind of multicarrier modulation system
Technical field
The present invention relates to communication and broadcast transmission field, differential space-time transmission diversity system and implementation method in particularly a kind of multicarrier modulation system.
Background technology
In multicarrier system, (Space Time Block Code is two kinds of effective deversity schemes with cyclic delay diversity STBC) to Space-Time Block Coding.Because the fading effect of wireless channel is the biggest obstacle that realizes the reliable wireless data transmission of High Data Rate, and Space Time Coding combines the diversity gain of many antennas and the coding gain of chnnel coding, thereby can be under the prerequisite that does not reduce data transmission rate, effectively the antagonism fading effect is realized reliable transmission.(3rd GenerationPartnership Project 3GPP) adopts Space Time Coding by third generation partner program.At present suppose all that about the major part research of Space Time Coding receiver can obtain accurate fading coefficients, yet when fading coefficients changes when very fast, for example travelling carriage is in high-speed motion, the cost of channel estimating can become very big and even may.
The difference empty time-code can all not known under the condition of channel fading coefficient at transmitter and receiver, utilizes many transmit antennas and reception antenna to carry out diversity and transmits and receives.Differential scheme is used widely in communication system.In the single transmit antenna, use differential ference spiral scheme (for example differential phase keying (DPSK) DPSK), can not be used as channel estimating.Constant is regarded in the response of channel as in the differential modulation scheme between two sampling times, and differential modulation is utilized information that phase difference transmits between the adjacent signals.Receiving terminal carries out demodulation by the phase place between current sign and the previous symbol is compared.
The Alamouti scheme is a kind of Space-Time Block Coding that complete emission diversity gain can be provided, and cyclic delay diversity also can provide full-diversity.The Alamouti diversity is introduced time domain between different antennae transmits relevant with the spatial domain, and comprehensive utilization time domain and spatial domain two-dimensional signal also can obtain coding gain when obtaining diversity gain.Cyclic delay diversity essence is that the space with many antennas independently declines, and by the mode of delayed delivery, is converted to the frequency diversity of the channel of equivalence.
The Alamouti scheme is a kind of simple Space-Time Block Coding, realizes sufficient diversity gain by the maximum-likelihood decoding algorithm, and the scheme of two antennas has the characteristics of full rate, full-diversity, simple linear codec algorithm.In the Space Time Coding of Alamouti two antennas, get two modulation symbol x 1And x 2Be a grouping, be entered into transmitting antenna according to following coding:
X = x 1 - x 2 * x 2 x 1 *
The output of encoder was launched from two transmit antennas in two continuous emission cycles.In first emission cycle, signal x 1And x 2Launch respectively from antenna 1 and antenna 2 simultaneously.In second period, signal
Figure A200710178607D00052
With
Figure A200710178607D00053
Emission respectively.
It is example that receiving terminal adopts a reception antenna, and the fading channel coefficient from first and second transmit antennas to reception antenna is used h respectively constantly at t 1(t) and h 2(t) expression supposes that fading coefficients is constant between two continuous symbol emission cycles.
The received signal of two continuous symbols in the cycle can be expressed as
r 1＝h 1x 1+x 2x 2+n 1
r 2 = - h 1 x 2 * + h 2 x 1 * + n 2
The decision statistic result of maximum-likelihood decoding can be expressed as
x ~ 2 = ( | h 1 | 2 + | h 2 | 2 ) x 2 - h 1 n 2 * + h 2 * n 1
x ~ 2 = ( | h 1 | 2 + | h 2 | 2 ) x 2 - h 1 n 2 * + h 2 * n 1
As shown in Figure 1, be the code and decoding principle figure of the empty time-code of Alamouti.Send data through behind the modulator 101, generate modulation signal x in first time interval and second time interval respectively 1And x 2, generate interior coded identification of two time intervals through Alamouti encoder 102 backs, x 1 - x 2 * x 2 x 1 * Send through antenna 103 and 104 respectively, the transmission signal of two antennas is received antenna 105 and receives through different transmission channels.
The realization that simple double antenna sends diversity scheme depends on channel estimating accurately, and the existence of evaluated error can cause the flat appearance of error code.Especially when mobile subscriber's high-speed motion, systematic function can sharply descend.Because because user's high-speed mobile, the also corresponding generation of the channel that it experienced sharply changes, often will soon lose efficacy by estimating the channel parameter that computing is caught.In order to address this problem, people such as Vahid Tarokh proposed the transmission diversity scheme of difference form in 2000.
Here introduce difference Alamouti coding and decode procedure.At first send two with reference to modulation signal x 1And x 2, data message is not carried in this twice transmission.Then, transmitter, and sends according to following mode the data sequential coding with difference modes.
The time 2t-1 of hypothesis sends signal x from transmitting antenna 1 and 2 respectively 2t-1And x 2t, send signal from transmitting antenna 1 and 2 respectively at time 2t
Figure A200710178607D00061
With
Figure A200710178607D00062
When time 2t+1, one group of 2m information bit arrives encoder, and these information bits are used to select two complex coefficient R 1And R 2Then according to the signal of previous emission and the complex coefficient of selecting, the transmission modulation signal of calculated for subsequent
( x 2 t + 1 , x 2 t + 2 ) = R 1 ( x 2 t - 1 , x 2 t ) + R 2 ( - x 2 t * , x 2 t - 1 * )
At receiving terminal, the received signal when time 2t-1,2t, 2t+1,2t+2 is expressed as respectively
r 2t-1＝h 1x 2t-1+h 2x 2t+n 2t-1
r 2 t = - h 1 x 2 t * + h 2 x 2 t - 1 * + n 2 t
r 2t+1＝h 1x 2t+1+h 2x 2t+2+n 2t+1
r 2 t + 2 = - h 1 x 2 t + 2 * + h 2 x 2 t + 1 * + n 2 t + 2
The decision statistic signal is:
R ~ 1 = ( r 2 t + 1 , r 2 t + 2 * ) ( r 2 t - 1 , r 2 t * )
= ( | h 1 | 2 + | h 2 | 2 ) R 1 + N ~ 1
R ~ 2 = ( r 2 t + 1 , r 2 t + 2 * ) ( r 2 t , - r 2 t - 1 * )
= ( | h 1 | 2 + | h 2 | 2 ) R 2 + N ~ 2
Wherein, N ~ 1 = ( x 2 t + 1 , x 2 t + 2 ) HN 2 t - 1 H + N 2 t + 1 H H ( x 2 t - 1 , x 2 t ) H + N 2 t + 1 N 2 t - 1 H
N ~ 2 = ( x 2 t + 1 , x 2 t + 2 ) HN 2 t H + N 2 t + 1 H H ( - x 2 t * , x 2 t - 1 * ) H + N 2 t + 1 N 2 t H
At last, by inverse mapping the bit array of emission is deciphered.
As shown in Figure 2, be difference STBC encoder schematic diagram, information bit generates two complex coefficient R through mapping code device 201 1And R 2, then encoder 202 according in preceding two time intervals transmit and complex coefficient is calculated the modulation symbol that transmits in latter two time interval, above-mentioned differential modulation symbol generates through STBC encoder 204 and sends symbols.
As shown in Figure 3, be difference STBC decoder schematic diagram, receiving symbol obtains the judgement A200710178607D0006173338QIETU.GIF of mapping symbols with preceding two time interval symbols through delayer 302 through statistics calculator 301 and A200710178607D0006173324QIETU.GIF should adjudicate the valuation that symbol process high specific decoder 303 obtains mapping symbols, with after inverse mapping decoder 304 obtains exporting bit.
Postponing transmit diversity is a kind of mode that is different from the Space Time Coding transmit diversity, after the information that will need to send in postponing transmit diversity sends from certain transmit antennas, after time-delay a period of time, repeat to send from other transmitting antenna again, this moment, information was not confined to send on the transmit antennas, thereby obtained diversity gain.Delay diversity is actually and artificially flat channel is become the multipath frequency-selective channel, so that obtain the path diversity gain at receiving terminal.
In ofdm system, adopt and postpone transmit diversity; if time of delay, long meeting caused intersymbol interference, for fear of this interference, maximum delay should be less than protection at interval; and adopt cyclic delay diversity (CDD, Cyclic Delay Diversity) can overcome this restriction.Waveform signal is through cyclic shift in the cyclic delay diversity, adds respectively behind the Cyclic Prefix by several antenna diversities emissions.Owing to is first cyclic shift in the cyclic delay diversity, the back adds Cyclic Prefix, does not exist overlappingly between the symbol of each antenna, can not cause intersymbol interference.
As shown in Figure 4, be the transmitter architecture figure of circulation delay transmit diversity among the OFDM.401 pairs of input data sequences of encoder are encoded, and coded sequence has outputed to digital modulator 402, obtain modulation symbol, serial/parallel converter 403 is divided into N data from the sample survey with modulation symbol sequence, and with the parallel OFDM modulator 404 that outputs to of the data from the sample survey of being divided, through OFDM modulation back output OFDM data from the sample survey, be converted to parallel data through parallel/serial transducer 405, export this parallel data.Cyclic Prefix inserter 410 duplicates G last OFDM sampling of data from the OFDM data from the sample survey, inserted the sampling of data that is duplicated and protect the most at interval before the OFDM symbol.Comprise that protection OFDM symbol at interval is called the OFDM transmission symbol.Antenna element 411 emission OFDM transmission symbols.Antenna element 431,441 emissions are through the delay OFDM transmission symbol of delayer 420,421,422.
In sum, all there is shortcoming separately in above-mentioned two kinds of schemes, and wherein, the Alamouti scheme does not use the frequency diversity of channel, have the lower shortcoming of gain and postpone diversity scheme under the situation of bad channel.
Summary of the invention
The objective of the invention is to, differential space-time transmission diversity system in a kind of multicarrier modulation system is provided, can under the prerequisite that guarantees transmission rate, obtain high space time diversity gain, effectively improve systematic function.
Another object of the present invention is to, differential space-time transmission diversity implementation method in a kind of multicarrier modulation system is provided, can under the prerequisite that guarantees transmission rate, obtain high space time diversity gain, effectively improve systematic function.
Differential space-time transmission diversity system in the multicarrier modulation system of the present invention, comprise transmitter and receiver, wherein, described transmitter comprises differential space-time coding device, two groups of OFDM modulators, Cyclic Prefix inserter and antennas, and be provided with time-delay δ unit therein between one group of OFDM modulator and the Cyclic Prefix inserter, wherein, described differential space-time coding device, be used to finish the difference Alamouti coding of modulation signal, coding back signal outputs to two-way, wherein behind one road signal process OFDM modulator, through the Cyclic Prefix inserter, through antenna transmission; After other one road code signal is organized the OFDM modulator through another, be sent to time-delay δ unit; Described time-delay δ unit after being used for the signal that described OFDM modulator sends carried out circulation time-delay that delay time is δ, is sent to after described Cyclic Prefix inserter inserts Cyclic Prefix, through antenna transmission.
Wherein, described receiver is by the transmitted diversity signals of its antenna reception from a plurality of antennas.
Wherein, decoder group, parallel/serial converter, digital modulator, deinterleaver and error correcting deocder when described receiver can comprise ofdm demodulator, difference empty, wherein, described ofdm demodulator, after the signal that is used for that described antenna is received carries out demodulation, decoder group when the parallel signal of exporting is sent to difference empty; Decoder group during described difference empty is sent to described parallel/serial converter after the decoding when signal that is used for that ofdm demodulator is sent carries out sky; Described parallel/serial converter, the decoder group is sent when being used for described difference empty when empty, and signal after the decoding carries out outputing to digital modulator after the parallel/serial conversion; Described digital modulator is used for signal is carried out being sent to deinterleaver after the digital modulation, again through the error correcting deocder data that are restored.
Differential space-time transmission diversity system in the multicarrier modulation system of the present invention, wherein, described differential space-time coding device can be differential space-time coding device group, described transmitter can further be provided with error correcting encoder, time-interleaved device, digital modulator, serial/parallel converter, wherein, described error correcting encoder is used for data are carried out being sent to described time-interleaved device after the error correction coding; Described time-interleaved device, the data that are used for that described error correcting encoder is sent carry out being sent to digital modulator after time-interleaved, carry out digital modulation, and modulation signal is undertaken being sent to differential space-time coding device group after the serial/parallel conversion by serial/parallel converter then.
The differential space-time transmission diversity implementation method comprises the following steps: in the multicarrier modulation system of the present invention
Steps A:, modulation signal is carried out outputing to two-way behind the difference Alamouti coding by the differential space-time coding device;
Step B: behind wherein one road signal process OFDM modulator in the steps A, through the Cyclic Prefix inserter, through antenna transmission; Other one road code signal through another group OFDM modulator after, be sent to time-delay δ unit, signal is carried out circulation time-delay that delay time is δ after, be sent to after described Cyclic Prefix inserter inserts Cyclic Prefix, through antenna transmission.
Wherein, may further include the following step:
Step C: the antenna by receiver receives the transmitted diversity signals from a plurality of antennas.
Wherein, described step C further comprises the following steps:
Step C1: after the signal that described receiver receives described antenna carried out the OFDM demodulation, the decoder group was deciphered when carrying out sky when the parallel signal of exporting was sent to difference empty;
Step C2: the signal when sky after the decoding outputs to digital modulator again and carries out digital modulation after parallel/serial converter carries out parallel/serial conversion;
Step C3: the signal after digital modulation is again through the error correcting deocder data that are restored.
In addition, before described steps A, may further include the following step:
Steps A ': data are carried out being sent to after the error correction coding time-interleaved device carry out being sent to digital modulator after time-interleaved, carry out digital modulation, modulation signal carries out being sent to after the serial/parallel conversion differential space-time coding device by serial/parallel converter and carries out difference Alamouti coding then.
The invention has the beneficial effects as follows: according to differential space-time transmission diversity system and implementation method in a kind of multicarrier modulation system of the present invention, made full use of the advantage of two kinds of diversity modes, difference empty time-code and two kinds of schemes of cyclic delay diversity are carried out combination, this scheme is utilized time-domain difference technology, quadrature Space Time Coding and CDD technology, have spectrum efficiency height, excavated space diversity of low also while of detection complexity, time diversity and advantages of frequency diversity, can under the prerequisite that guarantees transmission rate, obtain high space time diversity gain, effectively improve systematic function.
Description of drawings
Fig. 1 is the code and decoding principle figure of the empty time-code of Alamouti;
Fig. 2 is a difference STBC encoder schematic diagram;
Fig. 3 is a difference STBC decoder schematic diagram;
Fig. 4 is the transmitter architecture figure of circulation delay transmit diversity among the OFDM;
Fig. 5 is difference empty time-code and CDD diversity principle of combining block diagram;
Fig. 6 is the structural representation of the transmitter of the embodiment of the invention;
Fig. 7 is the structural representation of the receiver of the embodiment of the invention;
Fig. 8 compares schematic diagram for the performance that adopts method of the present invention at the rural area channel circumstance;
Fig. 9 compares schematic diagram for the performance that adopts method of the present invention at typical city channel circumstance.
Embodiment
Below, 5～9 describe differential space-time transmission diversity system and implementation method in the multicarrier modulation system of the present invention in detail with reference to the accompanying drawings.
In ofdm system, the Space-Time Block Coding structure is deciphered simple easily.By the orthogonal design of Space Time Coding, make system that maximum transmission rate is provided when full-diversity, thereby do not lose transmission bandwidth; Receiving terminal obtains optimum signal-noise ratio, can decode with the simplest maximum likelihood decoding algorithm.The differential coding detection technique can not know to finish incoherent detection under the condition of channel information at receiving terminal, obtains the room and time diversity of system.Differential space time block code sends modulation intelligence at the different time-gap of same frequency, needs to send on each subcarrier a R-matrix.This structure has only obtained space diversity by introducing redundancy in time-domain, does not have the diversity potentiality of abundant digging system.On the other hand, in ofdm system, use cyclic delay diversity (CDD), promptly on many antennas, launch the different circulation delay copies of same signal, can increase the frequency selectivity of channel, the frequency diversity gain of digging system, and have simple encoding and decoding structure.
Wherein, the frequency diversity of the system that the CDD diversity is utilized, and space-time emission diversity has utilized the time and the space diversity of channel, two kinds of methods have complementarity.Simultaneously, the CDD diversity can improve the performance of system preferably under the less channel circumstance of multipath number, and in the channel of multipath than complexity, because this moment, channel was a frequency selectivity, this moment, the effect of CDD diversity was limited, and can make full use of the space and time diversity ability of channel this moment with Space Time Coding.
Therefore, core concept of the present invention is: the advantage that makes full use of two kinds of diversity modes, difference empty time-code and cyclic delay diversity are combined, utilize time-domain difference technology, quadrature Space Time Coding and CDD technology, have spectrum efficiency height, excavated space diversity of low also while of detection complexity, time diversity and advantages of frequency diversity, can under the prerequisite that guarantees transmission rate, obtain high space time diversity gain, effectively improve systematic function.
As shown in Figure 5, be difference empty time-code and CDD diversity principle of combining block diagram.Differential space-time transmission diversity system in the multicarrier modulation system of the present invention, comprise transmitter and receiver, wherein, transmitter comprises, differential space-time coding device 501, two groups of OFDM modulators (OFDM modulator 511,521), Cyclic Prefix inserter (Cyclic Prefix inserter 512,523) and antennas 513,524, and be provided with time-delay δ unit 522 between one group of OFDM modulator 521 and the Cyclic Prefix inserter 523 therein.
Wherein, differential space-time coding device 501 is used to finish the difference Alamouti coding of modulation signal, and coding back signal outputs to two-way, wherein one road signal through OFDM modulator 511 after, through Cyclic Prefix inserter 512, send through antenna 513; Behind other one road code signal process OFDM modulator 521,,, send through antenna 524 then through Cyclic Prefix inserter 523 through circulation delay device 522.Time-delay δ unit 522, the signal that is used for that OFDM modulator 521 is sent are sent to Cyclic Prefix inserter 523 after carrying out circulation time-delay that delay time is δ.
Describe one exemplary embodiment of the present invention below with reference to the accompanying drawings in detail.Be illustrated in figure 6 as the structural representation of the transmitter of the embodiment of the invention, Fig. 7 is the structural representation of the receiver of the embodiment of the invention.
As shown in Figure 6, data are at first passed through error correcting encoder 601, elapsed time interleaver 602 then, be modulated to modulation signal through digital modulator 603, modulation signal becomes parallel signal through serial/parallel converter 604, signal when parallel modulation signal is empty through differential space-time coding device group 605 with each signal encoding.Differential space-time coding device group output two-way parallel signal, wherein one the tunnel through through OFDM modulator 611, passes through Cyclic Prefix inserter 612 subsequently, finishes the modulation of OFDM, outputs to antenna 613 and send.Behind other one road parallel signal process OFDM modulator 621 of differential space-time coding device group 605 outputs, pass through circulation delay device 622 again, the signal behind the circulation delay inserts Cyclic Prefix through Cyclic Prefix inserter 623 again, sends through antenna 624.
As shown in Figure 7, the transmitted diversity signals that antenna 701 receives from a plurality of antennas, through ofdm demodulator 702, decoder group 703 when the parallel signal of output passes through difference empty, the signal of decoding outputs to digital modulator 705 during through sky behind parallel/serial converter 704, the data of output are through deinterleaver 706, again through error correcting deocder 707 data that are restored.
The differential space-time transmission diversity implementation method comprises the following steps: in the multicarrier modulation system of the present invention
Step 100:, modulation signal is carried out outputing to two-way behind the difference Alamouti coding by the differential space-time coding device;
Step 200: behind wherein one road signal process OFDM modulator in the step 100, through the Cyclic Prefix inserter, through antenna transmission; Other one road code signal through another group OFDM modulator after, be sent to time-delay δ unit, signal is carried out circulation time-delay that delay time is δ after, be sent to after described Cyclic Prefix inserter inserts Cyclic Prefix, through antenna transmission.
Wherein, the differential space-time transmission diversity implementation method further comprises the following steps: in the multicarrier modulation system of the present invention
Step C: the antenna by receiver receives the transmitted diversity signals from a plurality of antennas.
Wherein, step C further comprises the following steps:
Step C1: after the signal that described receiver receives described antenna carried out the OFDM demodulation, the decoder group was deciphered when carrying out sky when the parallel signal of exporting was sent to difference empty;
Step C2: the signal when sky after the decoding outputs to digital modulator again and carries out digital modulation after parallel/serial converter carries out parallel/serial conversion;
Step C3: the data after digital modulation are again through the error correcting deocder data that are restored.
In addition, before described steps A, further comprise the following steps:
Steps A ': data are carried out being sent to after the error correction coding time-interleaved device carry out being sent to digital modulator after time-interleaved, carry out digital modulation, modulation signal carries out being sent to after the serial/parallel conversion differential space-time coding device by serial/parallel converter and carries out difference Alamouti coding then.
Fig. 8 and Fig. 9 show the algorithm, the algorithm that has adopted cyclic delay diversity that do not adopt transmit diversity, adopted difference Alamouti transmit diversity algorithm and adopt the present invention to propose the performance schematic diagram relatively of algorithm.Channel performance is represented the error rate (BER) performance according to signal to noise ratio (snr), and the channel circumstance at rural area and typical city has carried out simulation analysis respectively here.The enforcement parameter sees the following form:
Table 1
System bandwidth 1.536MHz
Available subcarrier 1536
Symbol duration (containing the Cyclic Prefix time) 1246us
Modulation system QPSK
The channel coding and decoding mode 1/2 convolutional encoding, Viterbi decoding
System synchronization Desirable
Channel model soon declines 6 footpaths, COST207 rural area, typical city III6 footpath
Doppler frequency shift 25Hz
In sum, according to differential space-time transmission diversity system in multi-carrier modulation of the present invention and implementation method, take full advantage of the advantage of two kinds of diversity modes, difference empty time-code and cyclic delay diversity two schemes are carried out combination, this scheme is utilized time-domain difference technology, quadrature Space Time Coding and CDD technology, advantage with spectrum efficiency height, excavated space diversity of low also while of detection complexity, time diversity and frequency diversity, can under the prerequisite that guarantees transfer rate, obtain higher space and time diversity gain, effectively improve systematic function.
More than be in order to make those of ordinary skills understand the present invention; and the detailed description that the present invention is carried out; but can expect; within not breaking away from the scope that claim of the present invention contains, can also make other changes and modifications, these variations and revising all in protection scope of the present invention.

Claims (8)

1. differential space-time transmission diversity system in the multicarrier modulation system, comprise transmitter and receiver, it is characterized in that, described transmitter comprises differential space-time coding device, two groups of OFDM modulators, Cyclic Prefix inserter and antennas, and be provided with time-delay δ unit therein between one group of OFDM modulator and the Cyclic Prefix inserter, wherein
Described differential space-time coding device is used to finish the difference Alamouti coding of modulation signal, and coding back signal outputs to two-way, wherein one road signal through the OFDM modulator after, through the Cyclic Prefix inserter, through antenna transmission; After other one road code signal is organized the OFDM modulator through another, be sent to time-delay δ unit;
Described time-delay δ unit after being used for the signal that described OFDM modulator sends carried out circulation time-delay that delay time is δ, is sent to after described Cyclic Prefix inserter inserts Cyclic Prefix, through antenna transmission.
2. differential space-time transmission diversity system in the multicarrier modulation system as claimed in claim 1 is characterized in that, described receiver is by the transmitted diversity signals of its antenna reception from a plurality of antennas.
3. differential space-time transmission diversity system in the multicarrier modulation system as claimed in claim 2, it is characterized in that, decoder group, parallel/serial converter, digital modulator, deinterleaver and error correcting deocder when described receiver comprises ofdm demodulator, difference empty, wherein
Described ofdm demodulator, after the signal that is used for that described antenna is received carries out demodulation, decoder group when the parallel signal of exporting is sent to difference empty;
Decoder group during described difference empty is sent to described parallel/serial converter after the decoding when signal that is used for that ofdm demodulator is sent carries out sky;
Described parallel/serial converter, the decoder group is sent when being used for described difference empty when empty, and signal after the decoding carries out outputing to digital modulator after the parallel/serial conversion;
Described digital modulator is used for signal is carried out being sent to deinterleaver after the digital modulation, again through the error correcting deocder data that are restored.
4. as differential space-time transmission diversity system in each described multicarrier modulation system in the claim 1 to 3, it is characterized in that, described differential space-time coding device is a differential space-time coding device group, described transmitter further is provided with error correcting encoder, time-interleaved device, digital modulator, serial/parallel converter, wherein
Described error correcting encoder is used for data are carried out being sent to described time-interleaved device after the error correction coding;
Described time-interleaved device, the data that are used for that described error correcting encoder is sent carry out being sent to digital modulator after time-interleaved, carry out digital modulation, are undertaken being sent to differential space-time coding device group after the serial/parallel conversion by serial/parallel converter then.
5. differential space-time transmission diversity implementation method in the multicarrier modulation system is characterized in that, comprises the following steps:
Steps A:, modulation signal is carried out outputing to two-way behind the difference Alamouti coding by the differential space-time coding device;
Step B: behind wherein one road signal process OFDM modulator in the steps A, through the Cyclic Prefix inserter, through antenna transmission; Other one road code signal through another group OFDM modulator after, be sent to time-delay δ unit, signal is carried out circulation time-delay that delay time is δ after, be sent to after described Cyclic Prefix inserter inserts Cyclic Prefix, through antenna transmission.
6. differential space-time transmission diversity implementation method in the multicarrier modulation system as claimed in claim 5 is characterized in that, further comprises the following steps:
Step C: the antenna by receiver receives the transmitted diversity signals from a plurality of antennas.
7. differential space-time transmission diversity implementation method in the multicarrier modulation system as claimed in claim 6 is characterized in that described step C further comprises the following steps:
Step C1: after the signal that described receiver receives described antenna carried out the OFDM demodulation, the decoder group was deciphered when carrying out sky when the parallel signal of exporting was sent to difference empty;
Step C2: the signal when sky after the decoding outputs to digital modulator again and carries out digital modulation after parallel/serial converter carries out parallel/serial conversion;
Step C3: the signal after digital modulation is again through the error correcting deocder data that are restored.
8. as differential space-time transmission diversity implementation method in the described multicarrier modulation system of claim 5 to 7, it is characterized in that, before described steps A, further comprise the following steps:
Steps A ': signal is carried out being sent to after the error correction coding time-interleaved device carry out being sent to digital modulator after time-interleaved, carry out digital modulation, carry out being sent to after the serial/parallel conversion differential space-time coding device by serial/parallel converter then and carry out difference Alamouti coding.
CNA2007101786079A 2007-12-03 2007-12-03 Differential space-time transmission diversity system in multi-carrier modulation system and implementing method Pending CN101453257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101786079A CN101453257A (en) 2007-12-03 2007-12-03 Differential space-time transmission diversity system in multi-carrier modulation system and implementing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101786079A CN101453257A (en) 2007-12-03 2007-12-03 Differential space-time transmission diversity system in multi-carrier modulation system and implementing method

Publications (1)

Publication Number Publication Date
CN101453257A true CN101453257A (en) 2009-06-10

Family

ID=40735305

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2007101786079A Pending CN101453257A (en) 2007-12-03 2007-12-03 Differential space-time transmission diversity system in multi-carrier modulation system and implementing method

Country Status (1)

Country Link
CN (1) CN101453257A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944988A (en) * 2009-07-08 2011-01-12 上海无线通信研究中心 Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof
WO2011017883A1 (en) * 2009-08-08 2011-02-17 中兴通讯股份有限公司 Method and apparatus for reducing mutual interference of multi-carrier
WO2012075952A1 (en) * 2010-12-08 2012-06-14 中国科学院上海微***与信息技术研究所 Demodulation method and demodulation system of spectral domain communication signal
CN103036841A (en) * 2012-12-07 2013-04-10 桂林电子科技大学 Methods of broadband wireless communication, emission and receiving under fast fading channels
WO2016119141A1 (en) * 2015-01-28 2016-08-04 华为技术有限公司 Differential signal transmission method, transmitting terminal device and receiving terminal device
CN107332606A (en) * 2017-06-27 2017-11-07 杭州电子科技大学 Based on double sampled LEO system difference space-time OFDM coding methods
WO2018018627A1 (en) * 2016-07-29 2018-02-01 深圳市道通智能航空技术有限公司 Data transmission method and system, and receiving device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944988B (en) * 2009-07-08 2013-07-24 上海无线通信研究中心 Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof
CN101944988A (en) * 2009-07-08 2011-01-12 上海无线通信研究中心 Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof
WO2011017883A1 (en) * 2009-08-08 2011-02-17 中兴通讯股份有限公司 Method and apparatus for reducing mutual interference of multi-carrier
US9094271B2 (en) 2009-08-08 2015-07-28 Zte Corporation Method and apparatus for reducing mutual interference of multi-carrier
CN102546502A (en) * 2010-12-08 2012-07-04 上海无线通信研究中心 Method and system for demodulating communication signals in spectral domain
WO2012075952A1 (en) * 2010-12-08 2012-06-14 中国科学院上海微***与信息技术研究所 Demodulation method and demodulation system of spectral domain communication signal
CN102546502B (en) * 2010-12-08 2016-08-03 上海无线通信研究中心 The demodulation method of a kind of spectral domain signal of communication and demodulating system
CN103036841A (en) * 2012-12-07 2013-04-10 桂林电子科技大学 Methods of broadband wireless communication, emission and receiving under fast fading channels
CN103036841B (en) * 2012-12-07 2015-09-02 桂林电子科技大学 Broadband wireless communications, transmitting and receiving method under fading channel
WO2016119141A1 (en) * 2015-01-28 2016-08-04 华为技术有限公司 Differential signal transmission method, transmitting terminal device and receiving terminal device
CN107113264A (en) * 2015-01-28 2017-08-29 华为技术有限公司 Differential signal transmission method, sending ending equipment and receiving device
CN107113264B (en) * 2015-01-28 2020-04-14 华为技术有限公司 Differential signal transmission method, sending end equipment and receiving end equipment
WO2018018627A1 (en) * 2016-07-29 2018-02-01 深圳市道通智能航空技术有限公司 Data transmission method and system, and receiving device
CN107332606A (en) * 2017-06-27 2017-11-07 杭州电子科技大学 Based on double sampled LEO system difference space-time OFDM coding methods

Similar Documents

Publication Publication Date Title
Gong et al. Space-frequency-time coded OFDM for broadband wireless communications
KR100774290B1 (en) Apparatus and method of space time block code for increasing performance
KR100720870B1 (en) Transmitting and receiving apparatus and method employing apparatus and method of space time block code for increasing performance
CN101453257A (en) Differential space-time transmission diversity system in multi-carrier modulation system and implementing method
CN104579613A (en) Joint encoding modulation method based on no-rate codes and V-OFDM
KR100780364B1 (en) Apparatus and method of space time block code for increasing performance
Ogale et al. Performance evaluation of MIMO-OFDM system using Matlab® Simulink with real time image input
KR100767218B1 (en) Apparatus and method of space time block code for increasing the coding advantages
CN101378283A (en) Diversity method for MIMO-OFDM system base on null-frequency encode
CN101374127B (en) Receiving method and apparatus for multi-input multi-output OFDM system
CN1801793A (en) Apparatus and method for receiving differential space-time block code
JP4166442B2 (en) Transmit diversity space-time coded signal equalization
CN101783722A (en) Transmission method and device for virtual MIMO
CN1941760B (en) multi-antenna orthogonal frequency division multiplexing iterative transmit/receiver and method
KR20060019447A (en) Apparatus and method of space time block code for 2 tx antennas with full diversity and full rate
Song et al. A scheme of combining differential chaos shift keying with multiple-input multiple-output system
Sheng et al. Computationally efficient channel estimation for space-time block coded system
Slimane et al. Concatenated orthogonal space-time block coding with four dimensional 8-PSK trellis coded modulation over fading channels in absence of channel state information
Chen et al. A space-time coding scheme with maximum diversity gains over frequency-selective fading channels
Ling MIMO simulation realization of DVB-T system based on MATLAB
Jia et al. Performance comparison of STBC and SFBC in turbo coded OFDM systems
KR100897363B1 (en) SFTC-OFDM telecommunication system and receiver of the same
Li et al. A new LDPC-COFDM scheme in cooperative communication system
Krishnasamy et al. A Novel Stochastic Model For Grouped Weighted Multilevel Space-Time Trellis Codes For Rayleigh Fading Channels
Li et al. Study on MIMO schemes for 3G-LTE downlink

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20090610