CN1859344A - Signal transmitting and receiving method and device - Google Patents

Abstract

The present invention discloses signal transmitting/receiving method and device. It adopts time space multiplexing technology and time space diversity technique adjoined and iteration mechanism possessed, iterate Turbo multiple input /multiple output MIMO orthogonal frequency division multiplexing OFDM signal transmitting/receiving method and device, further improving anti-interference ability, increasing diversity gain, effectively resisting burst error influence in mobile channel, enhancing communication system reliability, transmitting data rate and and error rate performance.

Description

A kind of signal emission/method of reseptance and device

Technical field

The present invention relates to signal emission/method of reseptance and device, belong to areas of information technology.

Background technology

Multiple-input and multiple-output MIMO (Multiple Input Multiple Output) technology is that future mobile communication system is realized high data rate, improve the important channel of transmission reliability, the method for the volume of business demand bottleneck problem that solves in the following Internet wireless network is provided.Multiple-input and multiple-output MIMO technology has appeared at communicate by letter 3G and back three generations of BWA, WLAN (wireless local area network) WLAN and the third generation and has communicated by letter in commercial wireless communications products such as B3G and the network.Multiple-input and multiple-output MIMO communication system is defined as: adopt a plurality of antennas respectively at transmitting terminal and receiving terminal, thereby improve the service quality (bit error rate or data rate) that each user obtains.Utilize multiple-input and multiple-output MIMO technology to increase network service performance and bring huge income to Virtual network operator.

Orthogonal frequency division multiplex OFDM (Orthogonal Frequency Division Multiplexing) technology is used and is started from the sixties in 20th century, is mainly used in the military communication.Along with the development of Digital Signal Processing and high speed device, the orthogonal frequency division multiplex OFDM application of in systems such as Asymmetrical Digital Subscriber Line ADSL, HDSL High-Speed Digital Subscriber Line VDSL, digital video broadcasting DVB, digital audio broadcasting DAB and high definition TV HDTV, succeeding.Enter the nineties in 20th century orthogonal frequency division multiplex OFDM technology and begin to be deep into the wireless broadband transmission field.In the orthogonal frequency division multiplex OFDM technology, frequency domain channel is divided into many orthogonal sub-channels, the carrier wave of each subchannel is mutually orthogonal, and frequency spectrum is overlapped.Because the orthogonal frequency division multiplex OFDM technology has strong, the availability of frequency spectrum advantages of higher of ability of anti-multipath, the orthogonal frequency division multiplex OFDM technology is the development trend in broadband wireless access field still not, has become the key technology of future mobile communication system research already.

Turbo is a kind of iterative idea, in the communications field, appears at the earliest in the coding, and the iteration Turbo code is Parallel Concatenated Convolutional Code again, and by Berrou, Glavieux and Thtimajshima proposed in 1993 first.Iteration Turbo code encoder by interleaver two recursive systematic convolutional code parallel cascades, decoder carries out iterative decoding between two component code decoders, external information is transmitted between decoding, the similar turbine of whole decode procedure (iteration Turbo) work is so be called as the iteration Turbo code again visually.Afterwards, the Turbo iteration theorem is widely used in all many-sides such as channel estimating, iteration equalizing, signal Synchronization and Multiuser Detection again, for numerous communication systems provide solution, also is one of key technology of future mobile communication system.

Solve the decline of multiple-input and multiple-output mimo system medium frequency selectivity, utilize balancing technique usually, or utilize the orthogonal frequency division multiplex OFDM technology.In addition, the orthogonal frequency division multiplex OFDM technology is the core technology of 4G, but 4G needs the high availability of frequency spectrum, and orthogonal frequency division multiplex OFDM is limited to the effect that improves the availability of frequency spectrum.Therefore, MIMO technology and orthogonal frequency division multiplex OFDM technology will be imported/exported more to reasonable development space resources on the basis of orthogonal frequency division multiplex OFDM more in conjunction with constituting the MIMO ofdm system, and more high data rate can be provided.Simultaneously, because the code check on each subcarrier of orthogonal frequency division multiplex OFDM technology is low and added guardtime at interval, has extremely strong anti-multipath interference performance.When multidiameter delay is protected at interval less than it; can make system not be subjected to the puzzlement of intersymbol interference; this just allows Single Frequency Network can be used for the broadband orthogonal frequency division multiplexing ofdm system; rely on many antennas to realize; the emission array that promptly adopts a large amount of low power transmissions antennas to form is eliminated shadow effect, realizes covering fully.

In principle, space-time trellis codes STTC, Space-Time Block Coding STBC and when empty technology such as structure (Bell Labs Layered Space TimeArchitecture) BLAST can appear at import/export in MIMO and the orthogonal frequency division multiplex OFDM system as the Space Time Coding module more more.Wherein, structure BLAST technology adopts multiplexing thought when empty, and space-time trellis codes STTC and Space-Time Block Coding STBC technology are then walked the diversity route.The former is that structure BLAST makes the transmitted data rates maximum when utilizing sky, and the latter then utilizes Space Time Coding thought to realize transmit diversity, reduces the error rate of transmission data.No matter adopt multiplexing thought, still walk the diversity route, all improved the transmission availability of frequency spectrum from different aspects respectively.

Summary of the invention

The objective of the invention is on the basis of Digital Signal Processing and high speed device development, multiplex technique and space and time diversity technology combine during with sky, a kind of iteration is provided, further improve many input/multi-output orthogonal frequency division multiplexing MIMOOFDM communication system anti-interference abilities, increase diversity gain, resist burst error influence in the mobile channel effectively, strengthen the signal emission/method of reseptance and the device of reliability of communication system.

A kind of signal emission/method of reseptance adopts multiple-input and multiple-output MIMO technology to carry out signal emission/reception in conjunction with the orthogonal frequency division multiplex OFDM technology.

The technology that multiplex technique and space and time diversity technology combine when further, adopting sky;

Also adopt alternative manner; This alternative manner is the Turbo alternative manner;

This sending method comprises:

At first: the chnnel coding that the user input data bit stream is had a soft input soft output decode is shone upon then and is become symbols streams;

Secondly: symbol sebolic addressing is converted to several and line output;

Once more: these parallel symbol sequences are carried out Space Time Coding;

Then: the sign matrix that obtains is inserted pilot tone;

At last: carry out sending after the modulating in OFDM;

Method of reseptance comprises:

At first: after receiving signal, carry out the orthogonal frequency division multiplex OFDM demodulation;

Secondly: the symbol sebolic addressing that obtains after the demodulation is separated into sequence of pilot symbols piece and the information symbol sequence piece that receiving terminal obtains;

Once more: the sequence of pilot symbols piece is carried out channel estimating obtain channel parameter;

Then: MIMO decoding when utilizing channel parameter that the burst piece is carried out sky obtains the estimated value that transmitting terminal second goes on foot the soft output of parallel symbol sequence among the result;

At last: to what obtain $O=(O_1,{\mathrm{<figure-callout\; id="2"\; label="O"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">O</figure-callout>}}_2...,O_{N,/2}),$ Decipher demodulation, obtain each symbol by demodulation after the probability of Bit data, this probability carries out the channel decoding corresponding to transmitting terminal as the initial value of soft Viterbi Viterbi decoder, information bit data probability that obtains estimating and coded-bit probability.

Second step of this sending method comprises: every group code sequence is converted to: (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) K/2+2}..., s _KNt/2) wait N _t/ 2 the tunnel and line output; The 3rd step comprised: to this N _t/ 2 tunnel parallel symbol sequences are carried out Space Time Coding, to symbol sebolic addressing (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) K/2+2}..., s _KNt/2) carry out acyclic interweaving.

In the 4th step of method of reseptance, described MIMO decoding when utilizing channel parameter that the burst piece is carried out sky obtains the estimated value of the soft output of parallel symbol sequence among second step of the transmitting terminal result, may further comprise the steps:

A. utilize least mean-square error MMSE criterion, each signal decomposition that receives is become N _t/ 2 signals and, this N _t/ 2 signals be illustrated respectively in the same input of transmitting terminal Space Time Coding two outputs and; The signal matrix Y that obtains is split into Y ₁, Y ₂..., Y _Nt/2

B. with signal matrix Y ₁, Y ₂..., Y _Nt/2And corresponding channel matrix carries out the rearrangement of column direction according to acyclic interweaving separately respectively;

C. to the Y after resetting through sequence ₁, Y ₂..., Y _Nt/2, decoding when carrying out soft output empty respectively;

D. to N _t/ 2 soft output matrixes of estimated value

Carry out the deinterleaving of column direction respectively, obtain N _t/ 2 soft output matrix O of estimated value _i

E. with N _t/ 2 soft output matrix O of estimated value _iConvert a soft output matrix to $O=(O_1,{\mathrm{<figure-callout\; id="2"\; label="O"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">O</figure-callout>}}_2,...,O_{N_t/2}).$

A kind of signal transmission/reception, it has the structure that can realize said method.

Further, its transmitting terminal comprises according to data stream element, coding mapping block, string and modular converter, Space Time Coding module, slotting pilot module, modulating in OFDM module and N for realizing that described method couples together _tIndividual rf transmitter unit; Its receiving terminal comprises according to the N for realizing that described method couples together _rDecoder module, decoding demodulation module and data recovered stream unit when individual rf receiver unit, orthogonal frequency division multiplex OFDM demodulation module, pilot tone separation module, channel estimation module, sky.

This Space Time Coding module comprises N _t/ 2 acyclic random interleaving modules; This modulating in OFDM/demodulation module comprises according to fast fourier transform IFFT module, insertion cyclic prefix CP module, modulation module, demodulation module, removal cyclic prefix CP module and Fourier transform FFT module for realizing that described method couples together; Decoder module comprises according to least mean-square error MMSE decoder module, sequence reordering module, N for realizing that described method couples together during this sky _tDecoder module, N when/2 Viterbi Viterbi are empty _t/ 2 de-interleaving blocks and parallel serial conversion module.

A kind of transmitter/receiver device is an iteration Turbo transmitter/receiver system, from N _t(even number) transmit antennas emission multi-carrier signal is to N _rRoot reception antenna, carrier wave wherein comprise a plurality of orthogonal subcarriers.

This transmitter system comprises coding mapping block, string and modular converter, Space Time Coding module, inserts pilot module and modulating in OFDM module, and the mapping block of wherein encoding is encoded to binary signal, and converts symbol to; String and modular converter are demultiplexed into N to signal flow _t/ 2 the tunnel, the Space Time Coding module provides space diversity and multiplexing function, inserts pilot module and inserts pilot frequency sequence, in order to channel estimating, the modulating in OFDM module is carried out modulating in OFDM and is added Cyclic Prefix signal, to eliminate intersymbol interference; Further, chnnel coding wherein is a kind of chnnel coding type that can adopt soft inputting and soft output when decoding, in order to strengthen the reliability of communication system transmits; Or

Slotting pilot module wherein is that at interval to insert diagonal element in signal matrix to be sent be pilot signal, and all the other positions are 0 signal matrix; Or

Space Time Coding wherein is to have adopted acyclic interleaver, N _t/ 2 tunnel conversion of signals become N _tThe road signal has possessed diversity and multiplexing function simultaneously.The output of Space Time Coding is not launched the sequence after former sequence and its interweave on adjacent transmitting antenna, be used to reduce the influence of the correlation that may exist between transmitting antenna.Acyclic interleaver has guaranteed input when receiving terminal can adopt Viterbi Viterbi method to carry out sky; Further, this acyclic interleaver produces at random, when to be original series according to the order of interleaved sequence got all numerals successively, can not form the interleaver of ring.

Or this receiver system comprises the orthogonal frequency division multiplex OFDM demodulation module, goes pilot module, channel estimation module, decoder module, decoding demodulation module when empty.Wherein the orthogonal frequency division multiplex OFDM demodulation module carries out the orthogonal frequency division multiplex OFDM demodulation to signal, go pilot module that pilot signal and data-signal are separated, channel estimation module provides channel estimation value, decoder module carries out symbol detection and channel decoding demodulation module recovery binary signal when being used for sky, further, 8, the receiver system of claim 3, wherein go the method for pilot module by intercepting, make pilot signal separate with data-signal, and pilot signal in order to carry out channel estimating; Or

Channel estimation module wherein is to utilize pilot signal, adopts the method for linear interpolation or other curve fits, the channel fading value on the frequency domain is estimated the channel estimation value that decoder module and decoding demodulation module need when obtaining sky; Or

The soft information of decoder module when decoding demodulation module wherein receives from sky according to the chnnel coding and the baseband signal modulation mapping method of coding mapping block correspondence in the transmitter system, is separated the mediation channel decoding accordingly.The output of module can be two kinds of results as required: the one, declare the data bit that the soft information of utilizing channel decoding to obtain recovers firmly.The 2nd, do not declare firmly, return the soft information of coded-bit; Or,

Decoder module during wherein empty comprises least mean-square error MMSE decoder module, sequence reordering module, decoder module, de-interleaving block and parallel serial conversion module constituted when Viterbi Viterbi was empty.Least mean-square error MMSE decoder module resolves into N to each received signal _t/ 2 signals and, the sequence reordering module is reset sequence, input when decoder module carried out sky when Viterbi Viterbi was empty, de-interleaving block is finished corresponding deinterleaving function, parallel serial conversion module is N _tThe soft output value of/2 tunnel input is merged into one the tunnel; Further, least mean-square error MMSE decoding diverter module receives the superposition in the sky signal from different transmitting antennas together to every, resolves into N according to least mean-square error MMSE criterion _t/ 2 signals and, wherein each signal that decomposes out just in time is preceding N _tThe signal of sending out on transmitting antenna with the corresponding back signal that interweaves in/2 transmit antennas is through the superposition of channel; Or,

The sequence reordering module is reset burst and respective channel estimated value according to transmitting terminal burst and interleaver order, forms an acyclic sequence, so that input can utilize Viterbi Viterbi method to carry out sky the time; Or

Decoder module was an input when utilizing the method for separating Dynamic Programming to carry out sky when Viterbi Viterbi was empty, the method of separating Dynamic Programming is based on soft-decision, promptly be to utilize the prior information of symbol to find the solution dynamic programming problems, simultaneously, the result as soft output is the probable value of each stage getting each state.

Wherein the mutual relation of soft information is determined according to the symbol level signal.Control the number of times that soft information is transmitted, the repeatedly transmission of order by soft information forms iteration Turbo receiver, makes the reliability of system improve constantly.

In sum, the present invention is achieved the iteration Turbo signal emission/method of reseptance and the device that are applied in many inputs/many outputs and the OFDM MIMO ofdm system.

The present invention can be applicable to the high speed data transmission service that may face at future mobile communications, and code check was N when the present invention's design provided sky _t/ 2 radio communication transmitter/receiver system.Because using acyclic random interleaving to carry out redundancy sends, and when using soft information at sky, receiving terminal carries out iteration between decoding and the channel decoding, the error rate of reduction system has strengthened the reliability of communication system, and the system that makes can resist abominable relatively mobile communication environment.Simultaneously, along with the continuous development of hardware technology level, the present invention also can be used for the higher radio communication real time business of delay requirement.

The present invention is directed to and have N _tTransmit antennas N _rThe communication system of root reception antenna adopts the chnnel coding that can carry out soft input soft output decode that binary bits is encoded at transmitting terminal, is N with the symbols streams demultiplexing after the modulation mapping _t/ 2 the tunnel, play the effect of spatial reuse, utilize acyclic interleaver then, with N _t/ 2 road signals interweave to carry out the diversity emission on other transmitting antennas; Adopt least mean-square error MMSE criterion with N earlier at receiving terminal _t/ 2 road signals separate from the signal that every reception antenna receives, every road signal is the superposition of primary signal and corresponding interleaved signal process channel, utilize the particularity of interleaver and the soft input of channel decoding, soft output character then, carry out that soft information is decoded when sky and channel decoding between iteration, form iteration Turbo receiver, thereby improve the reliability of system.

The present invention has mainly described and a kind of import/has exported MIMO orthogonal frequency division multiplex OFDM transmitter/receiver system more more, but the present invention can also similarly be used for other multicarrier transmitter/receiver systems, as: multi-carrier-wave-CDMA MC-CDMA.

Acyclic interleaver among the present invention makes when having leisure decoder module can use dynamic programming method to detect easily, the delay diversity of noticing ordinary meaning itself is exactly a kind of acyclic interleaver, and the present invention simultaneously can also be used to utilize other interleaving modes to reach the effect of space diversity.

The mode that adopts the former sequence and the back sequence that interweaves uniformly-spaced to send during hollow of the present invention in the coding module, same the present invention can be used for the arrangement of other transmitting antennas, the mode that adopts adjacent antenna to send as: the former sequence and the back sequence that interweaves.

The mode that being based in the frequency-region signal of using in the channel estimation module among the present invention inserted pilot tone is finished, but the present invention can be used to utilize the system of other channel estimation methods equally, as: preceding pilot tone mode commonly used or add the pilot tone mode.

Adopt least mean-square error MMSE shunting criterion during hollow of the present invention in the decoder module, can also adopt other criterions or shunt method.As: ZF ZF criterion or maximum likelihood ML criterion.

A kind of iteration Turbo receiver design is provided among the present invention, and the soft information when being embodied in sky between decoding and the channel decoding is transmitted mutually.Do not increase the soft mode of intelligence transmission that the back produces between a channel decoding but do not get rid of to utilize, as: adopt the iteration Turbo code, thus three layers of iteration Turbo receiver structure that soft information is transmitted that form.

Description of drawings

Fig. 1 is the transmitter schematic diagram of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention; Wherein, 1-transmitting terminal data flow, the 200-mapping block of encoding, 300-string and modular converter, 400-Space Time Coding module, 500-inserts pilot module, 600-OFDM modulation module, the N of 7-transmitting terminal _tIndividual antenna.

Fig. 2 is the receiver schematic diagram of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention; Wherein, the N of 8-receiving terminal _rIndividual antenna, the 900-OFDM demodulation module, 1000-pilot tone separation module, decoder module, 1300-decipher demodulation module, 14-receiving terminal data flow when 1100-channel estimation module, 1200-MIMO sky.

Fig. 3 is the Space Time Coding modular structure schematic diagram of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention; Wherein, the acyclic random interleaving module of 410-.

Fig. 4 is the weaving diagram of the acyclic random interleaving module of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention.

Fig. 5 is the insertion pilot tone schematic diagram of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention.

Fig. 6 is the sign matrix schematic diagram after the insertion pilot tone of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention.

Fig. 7 is the modulating in OFDM/demodulation module structural representation of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention.Wherein, 610-fast fourier transform IFFT module, 620-inserts the cyclic prefix CP module, the 630-modulation module, the 910-demodulation module, 920-removes cyclic prefix CP module, 930-Fourier transform FFT module.

Fig. 8 is the sign matrix schematic diagram that the receiving terminal of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention is received.

Fig. 9 is that MIMO decoding module structural representation is penetrated/received more to the pilosity of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention.Wherein, 1210-MMSE diverter module, 1220-sequence reordering module, decoder module when 1230-Viterbi is empty, 1240-de-interleaving block, 1250-parallel serial conversion module.

Figure 10 is that the Dynamic Programming of duplicating multi-antenna orthogonal frequency division iteration Turbo transmitter/receiver of the present invention detects schematic diagram.

Embodiment

Describe the preferred embodiment of the invention in detail below with reference to accompanying drawing 1-10, more the present invention imports/exports more in the MIMO orthogonal frequency division multiplex OFDM iteration Turbo signal transmitter/receiver embodiment, and transmitting terminal is by data stream element 1, coding mapping block 200, string and modular converter 300, Space Time Coding module 400, slotting pilot module 500, modulating in OFDM module 600 and N _tModules such as individual rf transmitter unit 7 constitute; Correspondingly, at receiving terminal by N _rModules such as decoder module 1200, decoding demodulation module 1300 and data recovered stream unit 14 constitute when individual rf receiver unit 8, orthogonal frequency division multiplex OFDM demodulation module 900, pilot tone separation module 1000, channel estimation module 1100, sky.Wherein, Space Time Coding module 400 is by N _t/ 2 acyclic random interleaving modules 410 are formed; Modulating in OFDM/demodulation module is made up of inverse fast fourier transform IFFT module 610, insertion cyclic prefix CP module 620, modulation module 630, demodulation module 910, removal cyclic prefix CP module 920 and Fourier transform FFT module 930; Decoder module 1200 is by least mean-square error MMSE decoder module 1210, sequence reordering module 1220 and N when empty _tDecoder module 1230 was formed when/2 Viterbi Viterbi were empty.

More the present invention imports/exports more the transmitting terminal of MIMO orthogonal frequency division multiplex OFDM iteration Turbo signal transmitter/receiver:

The first step: channel coding module 200 is that 1/2 convolution code is carried out chnnel coding to user input data bit stream 1 and is mapped to symbol then by code check, is about to input traffic 1 and is divided into some groups, and every group of data are (b ₁, b ₂..., b _KNt/2), every group length is KN _t/ 2, K is the sub-carrier number that system is used to send signal, N _tBe number of transmit antennas, coding back data are $({\tilde{b}}_1,{\tilde{b}}_2,...{\tilde{b}}_{{\mathrm{KN}}_t}),$ Length is KN _tCertainly, also can adopt other channel coding technologies that can produce soft output, as: iteration Turbo coding and low-density checksum LDPC coding.(quadriphase PSK: Quaternary Phase Shift Keying) mode is carried out baseband modulation to the data after encoding and is become symbols streams according to QPSK then.Per two bits are mapped to a symbol, and the symbol that the modulation back is every group is (s ₁, s ₂..., s _KNt/2).Also can use other modes such as quadrature amplitude modulation QAM, differential phase keying (DPSK) DPSK etc. to carry out the baseband modulation mapping.

Second step: every group code is converted to symbol sebolic addressing by string and modular converter 300: (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) k/2+2}..., s _KNt/2) wait N _t/ 2 the tunnel and line output.

The 3rd step: this N _t/ 2 tunnel parallel symbol sequences are carried out Space Time Coding through Space Time Coding module 400.Wherein, N _t/ 2 length are that the acyclic interleaving block 410 of K is respectively to symbol sebolic addressing (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) K/2+2}..., s _KNt/2) interweave.Suppose S ₁ (s ₁, s ₂..., s _K) form symbol sebolic addressing through the acyclic back that interweaves $S_{N_t/2+1}\stackrel{\mathrm{\&Delta;}}{=}(t_1,t_2,...,t_K),$ The sequence that correspondence has formed when having got all numerals successively according to the order of interleaved sequence is ${\tilde{S}}_1\stackrel{\mathrm{\&Delta;}}{=}({\tilde{s}}_1,{\tilde{s}}_2,...,{\tilde{s}}_K);$ S ₂ (s _K+1, s _K+2..., s _2K) form symbol sebolic addressing through the acyclic back that interweaves $S_{N_t/2+2}\stackrel{\mathrm{\&Delta;}}{=}(t_{K+1},t_{K+2},...,t_{2K}),$ The sequence that correspondence has formed when having got all numerals successively according to the order of interleaved sequence is ${\tilde{S}}_2\stackrel{\mathrm{\&Delta;}}{=}({\tilde{s}}_{K+1},{\tilde{s}}_{K+2},...,{\tilde{s}}_{2K});...;$ $S_{N_t/2}\stackrel{\mathrm{\&Delta;}}{=}(s_{(N_t-2)K/2+1},s_{(N_t-2)K/2+2},...,s_{K{N}_t/2})$ Form symbol sebolic addressing through the acyclic back that interweaves $S_{N_t}\stackrel{\mathrm{\&Delta;}}{=}(t_{(N_t-2)K/2+1},t_{(N_t-2)K/2+2},...,t_{K{N}_t/2}),$ The sequence that correspondence has formed when having got all numerals successively according to the order of interleaved sequence is ${\tilde{S}}_{N_t/2}\stackrel{\mathrm{\&Delta;}}{=}({\tilde{s}}_{(N_t-2)K/2+1},{\tilde{s}}_{(N_t-2)},...{,\tilde{s}}_{{KN}_t/2}).$ Sign matrix $S_{(N_t\&times;K)}\stackrel{\mathrm{\&Delta;}}{=}{(S_1^T,S_2^T...S_{N_t}^T)}^T\stackrel{\mathrm{\&Delta;}}{=}{(U_1^T,U_2^T,...,U_N^T)}^T,$

$S_{(N_t\&times;K)}^T\stackrel{\mathrm{\&Delta;}}{=}{F}_{(K\&times;N_t)}\stackrel{\mathrm{\&Delta;}}{=}{(F_1^T,F_2^T,...,F_K^T)}^T\stackrel{\mathrm{\&Delta;}}{=}{(U_1^T,U_2^T...U_N^T)}^T,U_j={(F_{(j-1)M+1}^T,F_{(j-1)M+2}^T,...,F_{\mathrm{jM}}^T)}^T,j=\mathrm{1,2},...N,$

$N=\frac{C-K}{N_t},M=\frac{K}{N},$ C is that inverse fast fourier transform IFFT module 610 and fast fourier transform FFT module 930 are done counting of inverse fast fourier transform and conversion in modulating in OFDM/demodulation module.

Matrix column respectively as the output 1 of Space Time Coding module to output N _t

The 4th step: the sign matrix of Space Time Coding module 400 outputs inserts pilot tone by inserting pilot module 500.Here defining pilot matrix is:

This value can be used quadriphase PSK QPSK modulation decision, e by modulation mapping block 200 _iBe that length is N _t, the i position is 1, all the other positions are a column vector of 0.Insert N pilot matrix P altogether, every M F _iRow inserts a P, promptly inserts one every a Ui.Obtain the sign matrix result $S^{\&prime;}={(P,U_1^T,P,U_2^T,...,P,U_N^T)}^T\stackrel{\mathrm{\&Delta;}}{=}(S_1^{\&prime;},{\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">S</figure-callout>}}_2^{\&prime;}...,S_{N_t}^{\&prime;}),$ Be a C * N _tMatrix, wherein,

$S_i^{\&prime;}={({\mathrm{pe}}_i^T,U_{1i}^T,{\mathrm{pe}}_i^T,U_{2i}^T,...,{\mathrm{pe}}_i^T,U_{\mathrm{Ni}}^T)}^T,U_{\mathrm{ji}}\stackrel{\mathrm{\&Delta;}}{=}{\left(s_{(j-1)M+1,i}^{\&prime;}\right)}^T,i=\mathrm{1,2},N_t,j=\mathrm{1,2},...N.$

The 5th step: the N of sign matrix S ' _tRow are admitted to N respectively _tIndividual modulating in OFDM module 600.In modulating in OFDM module 600, C data, i.e. s in 610 pairs of frequency domains of inverse fast fourier transform IFFT module _i' every row carry out inverse fast fourier transform, generate C sample number strong point S in the time domain _i".Use and insert 620 couples of S of cyclic prefix module _i" insert Cyclic Prefix, the length that is about to tail of sequence is that the part of C/4 copies to S _i" stem, forming length is the sequence S of 5C/4 _i.S _i is modulated to carrier wave by modulation module 630 with symbol sebolic addressing, sends into radio frequency part at last by N _tIndividual antenna element 7 sends.

More the present invention imports/exports more the receiving terminal of MIMO orthogonal frequency division multiplex OFDM iteration Turbo signal transmitter/receiver:

The first step: N _rAfter individual reception antenna unit 8 receives signal symbol sequence,, be total to N by orthogonal frequency division multiplex OFDM demodulation module 900 demodulation orthogonal frequency division multiplex OFDM symbols _rThe road.Concrete steps are as follows: at first, the length that will receive from antenna 8 by demodulation module 910 be the symbol sebolic addressing of 5C/4 by carrier wave demodulation to base band.Then, removing cyclic prefix module 920 is the Cyclic Prefix removal of C/4 with length in the received signal.Then, the C point time domain samples data point that 930 pairs of Fourier transform FFT modules obtain is carried out fast fourier transform, generates C point frequency domain data.

Second step: if note r _i ^k(i=1,2 ..., N _r, k=1,2 ..., C) be the signal that receives on k subcarrier of i root reception antenna, then $R_i={(r_i^1,{\mathrm{<figure-callout\; id="2"\; label="r\; i"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">r</figure-callout>}}_i^{},{\mathrm{<figure-callout\; id="3"\; label="r\; i"\; filenames="A20051007013400152.png"\; state="\{\{state\}\}">r</figure-callout>}}_i^{},...,r_i^C)}^T$ It is the signal of the whole orthogonal frequency division multiplex OFDM symbol that receives of i root reception antenna.By going pilot module 1000 with N _rThe symbol sebolic addressing of road orthogonal frequency division multiplex OFDM demodulation module 900 outputs $R_i={(r_i^1,{\mathrm{<figure-callout\; id="2"\; label="r\; i"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">r</figure-callout>}}_i^{},{\mathrm{<figure-callout\; id="3"\; label="r\; i"\; filenames="A20051007013400152.png"\; state="\{\{state\}\}">r</figure-callout>}}_i^{},...,r_i^C)}^T$ Be separated into the sequence of pilot symbols piece that receiving terminal obtains $p_i\stackrel{\mathrm{\&Delta;}}{=}{(p_i^1,{\mathrm{<figure-callout\; id="2"\; label="p\; i"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">p</figure-callout>}}_i^{},...,p_i^{C-K})}^T,i=\mathrm{1,2},...,N_r,$ The information symbol sequence piece that obtains with receiving terminal $Y_i\stackrel{\mathrm{\&Delta;}}{=}{(y_i^1,{\mathrm{<figure-callout\; id="2"\; label="y\; i"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">y</figure-callout>}}_i^{},y_i^K)}^T,i=\mathrm{1,2},...N_r,Y\stackrel{\mathrm{\&Delta;}}{=}{(Y_1^T,Y_2^T,...{,Y}_{N_r}^T)}^T$ Be N _r* K matrix.

The 3rd step: the sequence of pilot symbols piece is admitted to channel estimation module 1100, and channel estimation module 1100 uses the linear interpolation channel estimation methods to obtain channel parameter H _Ij ^k(k=1,2 ..., K; I=1,2 ..., N _rJ=1,2 ..., N _t ).Decoder module 1200 when channel parameter and burst piece are admitted to sky.

The 4th step: decode when decoder module 1200 carries out sky when empty, obtain N among second step of the transmitting terminal result _tThe soft output estimated value of/2 tunnel parallel symbol sequences.Concrete steps are as follows:

A. by least mean-square error MMSE diverter module 1210, utilize least mean-square error MMSE criterion, each signal decomposition that receives is become N _t/ 2 signals and, this N _t/ 2 signals be illustrated respectively in the 400 same inputs of transmitting terminal Space Time Coding module two outputs and:

$y_{i,j}^k\&cong;h_{i,j}^k{S}_{j,k}+h_{i,j+N_t/2}^k{S}_{j+N_t/2,k},i=\mathrm{1,2},...,N_r,j=\mathrm{1,2},...,N_t/2,k=\mathrm{1,2},...,K.$ Note

${\stackrel{\&OverBar;}{Y}}_j^k\stackrel{\mathrm{\&Delta;}}{=}{(y_{1,j}^k,{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">y</figure-callout>}}_{2,j}^k,...,y_{N_r,j}^k)}^T,$ Then ${\stackrel{\&OverBar;}{Y}}_j\stackrel{\mathrm{\&Delta;}}{=}({\stackrel{\&OverBar;}{Y}}_j^1,{\stackrel{\&OverBar;}{Y}}_{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">j</figure-callout>}}^2,...,{\stackrel{\&OverBar;}{Y}}_j^K)$ Be N _r* K matrix.This least mean-square error MMSE diverter module 1210 is split into Y to the signal matrix Y that goes pilot module 1000 to obtain ₁, Y ₂..., Y _Nt/2, send into N respectively _t/ 2 sequence reordering module 1220.

B. sequence reordering module 1220 is with signal matrix Y ₁, Y ₂..., Y _Nt/2And corresponding channel matrix carries out the rearrangement of column direction respectively according to acyclic interleaver separately.Be that mark is convenient, below still use Y ₁, Y ₂..., Y _Nt/2And h _Ij ^k(k=1,2 ..., K; I=1,2 ..., N _rJ=1,2 ..., N _t) signal matrix and corresponding channel estimation value after expression is reset.

C.N _t/ 2 through the Y after 1220 rearrangements of sequence reordering module ₁, Y ₂..., Y _Nt/2, import Viterbi Viterbi decoder module 1230 when empty respectively, decoding when carrying out soft output empty.Input 21 when Viterbi Viterbi is empty in the decoder module 1230 to input 2Nt/2 from decoding demodulation module 1300, the initial value during decoding when empty as Viterbi Viterbi during decoder module 1200, is not considered these inputs when operation is empty for the first time.Decode structures demonstration when Figure 10 has provided at the Viterbi Viterbi sky of QPSK modulation system.Decoder module 1230 when corresponding i Viterbi Viterbi is empty, the weights on the limit of the network of using in the decoding are defined as:

${}_{i}q_{m,n}^k=\frac{1}{\sqrt{2\mathrm{\&pi;}}\mathrm{\&sigma;}}{e}^{-\underset{j=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{(y_{i,j}^k-h_{i,j}^k{C}_m-h_{i,j+N_r/2}^k{C}_n)}^2/\left({2\mathrm{\&sigma;}}^2\right)}.$ Can obtain by Viterbi Viterbi method (perhaps maximum a posteriori probability BCJR method) commonly used The soft output matrix of estimated value

(elements in 4 * K) the dimension matrixes are probable value, the soft output that representative detects for this.

D.N _t/ 2 soft output matrixes of estimated value

Carry out the deinterleaving of column direction respectively through de-interleaving block 1240, obtain N _t/ 2 soft output matrix O of estimated value _i

E.N _t/ 2 soft output matrix O of estimated value _iConvert a soft output matrix to through parallel serial conversion module 1250

$O=(O_1,{\mathrm{<figure-callout\; id="2"\; label="O"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">O</figure-callout>}}_2,...,O_{N_t/2}).$

The 5th step: 1300 pairs of demodulation modules of decoding obtain $O=(O_1,{\mathrm{<figure-callout\; id="2"\; label="O"\; filenames="A20051007013400131.png"\; state="\{\{state\}\}">O</figure-callout>}}_2,...,O_{N_t/2}),$ Do the soft demodulation of quadriphase PSK QPSK mode corresponding to transmitting terminal, each symbol is demodulated to the probability of two Bit datas, this probability is as the initial value of Viterbi Viterbi decoder, carry out convolutional code decoder corresponding to transmitting terminal, obtain new information bit probability and coded-bit probability, if need carry out iterative space when decoding time, then these coded-bit probability carry out with respect to transmitting terminal coding mapping block 200, the mapping of string and modular converter 300 and string and process obtain N _t/ 2 soft output matrixes of estimated value

Decoder module 1200 when input is empty, otherwise, the information bit probability is declared firmly, finally obtain the required bit data flow of user 14.

Although embodiment has been described the preferred embodiments of the present invention, one of skill in the art should be appreciated that the present invention is not limited to described preferred embodiment, within flesh and blood scope of the present invention, variations and modifications can be arranged.Therefore, scope of the present invention is not limited to described content.

Claims (11)

1, a kind of signal emission/method of reseptance is characterized in that: adopt multiple-input and multiple-output MIMO technology to carry out signal emission/reception in conjunction with the orthogonal frequency division multiplex OFDM technology.

2, signal emission/method of reseptance according to claim 1 is characterized in that: the technology that multiplex technique and space and time diversity technology combine when adopting sky.

3, signal emission/method of reseptance according to claim 1 is characterized in that: also adopt alternative manner.

4, signal emission/method of reseptance according to claim 3 is characterized in that: this alternative manner is the Turbo alternative manner.

5, according to arbitrary described signal emission/method of reseptance among the claim 1-4, it is characterized in that: this sending method comprises:

At first: the chnnel coding that the user input data bit stream is had a soft input soft output decode is shone upon then and is become symbols streams;

Secondly: symbol sebolic addressing is converted to several and line output;

Once more: these parallel symbol sequences are carried out Space Time Coding;

Then: the sign matrix that obtains is inserted pilot tone;

At last: carry out sending after the modulating in OFDM;

Method of reseptance comprises:

At first: after receiving signal, carry out the orthogonal frequency division multiplex OFDM demodulation;

Secondly: the symbol sebolic addressing that obtains after the demodulation is separated into sequence of pilot symbols piece and the information symbol sequence piece that receiving terminal obtains;

Once more: the sequence of pilot symbols piece is carried out channel estimating obtain channel parameter;

Then: utilize channel parameter, MIMO decoding when the burst piece is carried out sky obtains the estimated value that transmitting terminal second goes on foot the soft output of parallel symbol sequence among the result;

At last: to what obtain $O=(O_1,O_2,...,O_{N_t/2}),$ Decipher demodulation, obtain each symbol by demodulation after the probability of Bit data, this probability carries out the channel decoding corresponding to transmitting terminal as the initial value of Viterbi Viterbi decoder, information bit data probability that obtains estimating and coded-bit probability.

6, signal emission/method of reseptance according to claim 5 is characterized in that: second step of this sending method comprises: every group code sequence is converted to: (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) K/2+2}..., s _KNt/2) wait N _t/ 2 the tunnel and line output; The 3rd step comprised: to this N _t/ 2 tunnel parallel symbol sequences are carried out Space Time Coding, to symbol sebolic addressing (s ₁, s ₂..., s _K), (s _K+1, s _K+2..., s _2K) ..., (s _{(Nt-2) K/2+1}, s _{(Nt-2) K/2+2}..., s _KNt/2) carry out acyclic interweaving.

7, signal emission/method of reseptance according to claim 5, it is characterized in that: in the 4th step of method of reseptance, described MIMO decoding when channel parameter and burst piece are carried out sky, obtain the estimated value of the soft output of parallel symbol sequence among second step of the transmitting terminal result, may further comprise the steps:

A. utilize least mean-square error MMSE criterion, each signal decomposition that receives is become N _t/ 2 signals and, this N _t/ 2 signals be illustrated respectively in the same input of transmitting terminal Space Time Coding two outputs and; Going the signal matrix Y that obtains after the pilot tone to be split into Y ₁, Y ₂..., Y _Nt/2

B. with signal matrix Y ₁, Y ₂..., Y _Nt/2And corresponding channel matrix carries out the rearrangement of column direction according to acyclic interweaving separately respectively;

C. to the Y after resetting through sequence ₁, Y ₂..., Y _Nt/2, decoding when carrying out soft output empty respectively;

D. to N _t/ 2 soft output matrixes of estimated value Carry out the deinterleaving of column direction respectively, obtain N _t/ 2 soft output matrix O of estimated value _i

E. with N _t/ 2 soft output matrix O of estimated value _iConvert a soft output matrix to $O=(O_1,O_2,...,O_{N_t/2}).$

8, a kind of signal transmission/reception, it is characterized in that: it has the structure that can realize arbitrary described method among the claim 1-6.

9, transmission/reception according to claim 8 is characterized in that: its transmitting terminal comprises according to data stream element, coding mapping block, string and modular converter, Space Time Coding module, slotting pilot module, modulating in OFDM module and N for realizing that described method couples together _tIndividual rf transmitter unit; Its receiving terminal comprises according to the N for realizing that described method couples together _rDecoder module, decoding demodulation module and data recovered stream unit when individual rf receiver unit, orthogonal frequency division multiplex OFDM demodulation module, pilot tone separation module, channel estimation module, sky.

10, transmission/reception according to claim 9 is characterized in that: this Space Time Coding module comprises N _t/ 2 acyclic random interleaving modules; This modulating in OFDM/demodulation module comprises according to fast fourier transform IFFT module, insertion cyclic prefix CP module, modulation module, demodulation module, removal cyclic prefix CP module and Fourier transform FFT module for realizing that described method couples together; Decoder module comprises according to least mean-square error MMSE decoder module, sequence reordering module, N for realizing that described method couples together during this sky _tDecoder module, N when/2 Viterbi Viterbi are empty _t/ 2 de-interleaving blocks and parallel serial conversion module.

11, a kind of transmitter/receiver device is characterized in that: be iteration Turbo type, from N _tTransmit antennas emission multi-carrier signal is to N _rRoot reception antenna, carrier wave wherein comprise a plurality of orthogonal subcarriers.

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