CN1780172A - Multi-transmitting and multi-receiving antenna orthogonal FDM transmitting/receiving apparatus - Google Patents

Abstract

A multi-input multi-output orthogonal frequency division multiplexing (MIMO OFDM) transmitting/receiving machine with high performance and data transmission rate and low error code rate features that the BLAST signal processing technique, the STTC code, and the STBC code are combined, the signal diversity is performed by delay method, a single-ring random interleave device is used to disorder the signals, and after the signals are deinterlaced, they are dynamically decoded.

Description

A kind of pilosity is penetrated the multiple receive antenna orthogonal frequency division multiplex ransmitting and is penetrated/receiver

Technical field

The present invention relates to a kind of signal transmitter/receiver, the pilosity that structure BLAST and space-time trellis codes STTC, Space-Time Block Coding STBC technology combine when relating in particular to the employing sky is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver, belongs 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 quality, be one of important breakthrough in the modern communication technology, the volume of business demand that solves in following Internet wireless network bottleneck problem is provided.Multiple-input and multiple-output MIMO technology has appeared in BWA, WLAN (wireless local area network) WLAN and 3G and commercial wireless communications products such as back 3G etc. 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, just signal transmits and receives by a plurality of antennas of transmitting terminal and receiving terminal, thereby improves 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 (0rthogonal Frequency Division Multiplexing) technology is used and is started from the sixties in 20th century, is mainly used in the military communication.Because complex structure has limited its further popularization.The seventies, adopt discrete fourier transform to realize multi-carrier modulation, make the orthogonal frequency division multiplex OFDM technology begin to move towards practicability.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 nineties orthogonal frequency division multiplex OFDM technology and be deep into wireless channel wideband transmit field.In the orthogonal frequency division multiplex OFDM technology, frequency domain channel is divided into many orthogonal sub-channels, the intercarrier of each subchannel keeps quadrature, and frequency spectrum is overlapped.Like this, reduce the interference between subchannel, improved the availability of frequency spectrum.Simultaneously, signal bandwidth is less than channel width on each subchannel, and whole channel has the frequency selectivity of non-flat forms, and each subchannel relatively flat has reduced intersymbol interference greatly.The orthogonal frequency division multiplex OFDM technology is applicable to the high speed data transfer in multi-path environment and the frequency selective fading channels.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, and will become the key technology of future mobile communication system.

To a certain extent, although multiple-input and multiple-output MIMO technology can be utilized the multipath component in the propagation, promptly multiple-input and multiple-output MIMO can decline by anti-multipath, and for the frequency selectivity deep fade, multiple-input and multiple-output MIMO technology is still powerless.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, reasonable development space resources on the basis of orthogonal frequency division multiplex OFDM, pilosity is penetrated/multiple receive antenna MIMO and orthogonal frequency division multiplex OFDM technology be in conjunction with constituting the MIMOOFDM system, and more high data rate can be provided.Simultaneously, the orthogonal frequency division multiplex OFDM technology has extremely strong anti-multipath interference performance because code check is low and added guardtime at interval.Say again; multidiameter delay less than protection at interval; 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 transmitter array that promptly adopts a large amount of low-powered transmitters to form is eliminated shadow effect, realizes covering fully.

In addition, in principle, space-time trellis codes STTC, Space-Time Block Coding STBC and when empty technology such as structure BLAST can penetrate as pilosity/coding in the multiple receive antenna MIMO module appears in the MIMO ofdm system.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 data rate maximum when utilizing sky, and the latter then utilizes Space Time Coding thought to make error rate minimum.No matter adopt multiplexing thought, still walk the diversity route, all improved the transmission availability of frequency spectrum substantially from different aspects respectively.The present invention is in order to overcome the deficiency of the multiplexing or diversity route of single employing, find the binding site of the two, by research, utilize hardware that the two is combined, make performance and transmission rate reach a best compromise point, thereby a kind of have very big potentiality and application prospect are provided, adopt diversity thought that space-time trellis codes STTC, Space-Time Block Coding STBC have and pilosity that structure BLAST technology has when empty multiplexing thought combines is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver.

Summary of the invention

The objective of the invention is on the basis of Digital Signal Processing and high speed device development, structure BLAST technology is in the same place by combination of hardware with Space-Time Block Coding STBC technology with space-time trellis codes STTC during with sky, providing a kind of further improves pilosity and penetrates/multiple receive antenna and OFDM MIMO ofdm communication system interference free performance, increase diversity gain, effectively burst error influence in the antagonism mobile channel, the enhancing reliability of communication system, data rate and bit error rate performance be transmitter/receiver between structure BLAST and the Space-Time Block Coding STBC technology when single employing is empty all.

Specifically, the hardware of the present invention by constituting, make be applied in pilosity penetrate/delay and random interleaving method in multiple receive antenna and the OFDM MIMOOFDM system be achieved.The transmitter/receiver that hardware constitutes, transmitting terminal is arranged module, monocycle random interleaving module, modulating in OFDM module, is added cyclic prefix CP module and N by channel coding module, baseband modulation mapping block, string and modular converter, delay _tParts such as individual radiofrequency emitting module constitute; Correspondingly, at receiving terminal by N _rIndividual Receiver Module, go parts such as cyclic prefix CP module, orthogonal frequency division multiplex OFDM demodulation module, de-interleaving block, channel estimation module, MIMO decoding module, rectification mapping block and channel decoding module to constitute.Be characterized in: at transmitting terminal, utilize the method that postpones that signal is carried out diversity, by the random interleaver of monocycle the order of signal is upset then, after the receiving terminal deinterleaving, utilize the special construction of inhibit signal at last, carry out MIMO decoding by Dynamic Programming.Wherein, multiple-input and multiple-output MIMO communication system adopts a plurality of antennas respectively at transmitting terminal and receiving terminal.Signal transmits and receives by a plurality of antennas of transmitting terminal and receiving terminal, improves bit error rate or data rate, increases network service performance.

The present invention is in orthogonal frequency division multiplex OFDM, and whole bandwidth is divided into N subchannel, and the interval bandwidth of subchannel is f ₀, the carrier frequency of system is f _cAt moment k, the data of frequency domain and pilot tone are arranged according to certain frame format, form k orthogonal frequency division multiplex OFDM symbol: d (k, 0) d (k, 1) L d (k, N-1), the orthogonal frequency division multiplex OFDM symbol is through fast Flourier IFFT conversion, add long enough cyclic prefix CP (Cyclic Prefix), be modulated to carrier frequency f greater than the channel maximum delay _c, send in the wireless channel then; At receiving terminal, carry out demodulation to the received signal, remove cyclic prefix CP, do Fourier FFT conversion, sampling obtains receiving symbol at last

Therefore, reasonable development space resources on the basis of orthogonal frequency division multiplex OFDM, pilosity is penetrated/multiple receive antenna MIMO and orthogonal frequency division multiplex OFDM technology be in conjunction with constituting the MIMO ofdm system, and more high data rate can be provided.

When in addition, empty structure BLAST (Bell Labs Layered Space-Time) signal processing technology be a kind of adopt pilosity penetrate/multiple receive antenna MIMO realizes the structure of parallel transmission data.Structure BLAST signal processing technology can make the capacity of wireless link improve 20 to 30 times when empty.Be that each sends the different transmitting antenna of signal employing, also utilize a plurality of antennas and unique signal processing technology that the Signal Separation that interferes with each other is come out at receiving terminal, thus can be on given channel bands, and capacity is with the proportional increase of the quantity of antenna.And the signal processing technology that adopts in the structure BLAST signal processing technology when empty can utilize the space to eliminate these interference and noise when noise and interference ratio are more serious.Promptly utilize multipath, the scattering of transmission environment is used as these multipaths as the parallel channel of separation, strengthens the transmission precision of channel.

Whether structure BLAST (Bell Labs Layered Space-Time) signal processing technology can be by using error control coding to be categorized as when empty:

(1) structure (VBLAST) during vertical bell laboratories layered space.This is a kind of hierarchy that does not adopt coding, and the data of input are gone here and there earlier and changed, and generates N _tHeight stream (quantity of transmitting antenna) is modulated each son stream then respectively, sends by different antennae again.

Structure (HBLAST) when (two) horizontal slice is empty adopts coding, and encoder can be placed on different local, first kind of situation is earlier input information to be encoded, to the data multiplex behind the coding, generate N son stream then, each son stream sends by different antennae in modulation, the back that interweaves; Second kind of situation is that elder generation also changes the input serial data, then each son flowed absolute coding, modulates and interweaves, and sends by different antennae again.

(3) diagonal angle layered space-time architecture (DBLAST) is the better hierarchy of a kind of performance.Each code word of encoder output is arranged on the diagonal element of transmission matrix after modulation, compares with the signal of first antenna transmission, and the moment of i this signal of antenna transmission postpones i-1 unit interval.Because diagonal angle layered space-time architecture DBLAST introducing space diversity, structure HBLAST was better when performance was more empty than horizontal slice, but filled out 0 because of the lower left corner at sending metrix, and spectrum efficiency has certain loss.

Secondly, Space Time Coding in the Space Time Coding signal processing method is the coding techniques that the transmit diversity on the spatial domain and the chnnel coding on the time-domain are combined, coding on the spatial domain can utilize spatial redundancies to realize diversity, overcomes channel fading, improves performance.The Space Time Coding performance index have: the full marks intensity is the long-pending NM that the obtainable maximum diversity gain of system equals number of transmit antennas and reception antenna number; The message transmission rate that full data rate is a system is identical with a single aerial system that does not use Space-Time Block Coding.Just, if the Space Time Coding Matrix C has T * N rank (wherein N is a number of transmit antennas, and T is the sending time slots number), and T time slot be when sending Z symbol, and so completely data rate just means Z/T=1.Wherein, space-time trellis codes STTC (space timetrellis code) is the coded system that transmit diversity is combined with Trellis-coded modulation.The encoding scheme that obtains obtains full diversity gain and high coding gain under the situation of sacrificial system bandwidth not, and then the raising transmission quality.Suppose that the discrete multi-antenna array has N _rIndividual reception antenna and N _tIndividual transmitting antenna.After the information source data are space-time encoded, form modulation symbol, send simultaneously by different transmitting antennas respectively at time slot t.Modulation symbol is any point in the signal constellation which.Adopt space-time trellis codes STTC can obtain coding gain and diversity gain simultaneously, though it can provide the spectrum efficiency higher 3～4 times than existing system, the exponential increase of its decoding complexity along with the increase of status number.

Space-Time Block Coding STBC (space time block code) utilizes orthogonality principle to distribute the form that transmits on each transmitting antenna, and is the quadrature block encoding mode of a kind of spatial domain and time-domain combination.Space-time block code obtains the full diversity gain after can making receiver decoding, and guarantees that the decoding computing only is simple linear the merging, reduces decoding complexity greatly.N is being arranged _tDuring=2 transmit antennas, reciprocity armed continuous signal (c ₀, c ₁) transmit in such a way: constantly one, transmitting antenna one c that transmits ₀, transmitting antenna two c that transmits ₁In the moment two, transmitting antenna one transmits-c ₁ ^*, transmitting antenna two c that transmits ₀ ^*If transmission is complex signal, the N of working as is only arranged _t=2 o'clock, message transmission rate can reach 1, and works as N _t＞4 o'clock, message transmission rate can only reach 1/2.The present invention is on the basis of Digital Signal Processing and high speed device development, structure BLAST technology is in the same place by combination of hardware with Space-Time Block Coding STBC technology with space-time trellis codes STTC during with sky, thereby further improving pilosity penetrates/multiple receive antenna and OFDM MIMO OFDM transmitter/receiver communication system interference free performance, increase diversity gain, effectively burst error influence in the antagonism mobile channel, strengthen reliability of communication system, and data rate and bit error rate performance are all when single employings sky between structure BLAST and the Space-Time Block Coding STBC technology.

Advantage of the present invention is, the two combines with the multiplexing thought of spectrum utilization and diversity route by hardware, make performance and transmission rate reach the compromise point an of the best, thereby a kind of have very big potentiality and application prospect are provided, adopt space-time trellis codes STTC, Space-Time Block Coding STBC and structure BLAST technology combines when empty pilosity is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver.

Description of drawings

Fig. 1 is that pilosity of the present invention is penetrated/the MIMOOFDM system schematic of multiple receive antenna MIMO and orthogonal frequency division multiplex OFDM signal transmitter/receiver; Wherein, 1-transmitting terminal data flow, the 100-channel coding module, 200-baseband modulation mapping block, the 300-MIMO coding module, 260-inserts pilot module, 400-OFDM modulation module, the N of 2-transmitting terminal _tIndividual antenna, the N of 3-receiving terminal _rIndividual antenna, 500-OFDM demodulation module, 280-pilot tone separation module, 600-channel estimation module, 700-MIMO decoding module, 800-rectification mapping block, 900-channel decoding module, 4-receiving terminal data flow.

Fig. 2 be pilosity of the present invention penetrate/pilosity in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver penetrates/multiple receive antenna MIMO coding module structural representation; Wherein, 310-string and modular converter, 320-postpone to arrange module, 330-monocycle random interleaving module.

Fig. 3 is that pilosity of the present invention is penetrated/delay interleaving process schematic diagram in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver.

Fig. 4 is that pilosity of the present invention is penetrated/insertion pilot tone schematic diagram in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver.

Fig. 5 is that pilosity of the present invention is penetrated/sign matrix schematic diagram after the insertion pilot tone in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver.

Fig. 6 is that pilosity of the present invention is penetrated/modulating in OFDM/demodulation module structural representation in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver.Wherein, 410-fast fourier transform IFFT module, 420-inserts the cyclic prefix CP module, the 430-modulation module, the 510-demodulation module, 520-removes cyclic prefix CP module, 530-Fourier transform FFT module.

Fig. 7 is that pilosity of the present invention is penetrated/sign matrix schematic diagram that receiving terminal in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver is received.

Fig. 8 be pilosity of the present invention penetrate/pilosity in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver penetrates/multiple receive antenna MIMO decoding module structural representation.Wherein, 710-separates the monocycle interleaving block, 730-memory module, 720-control module, 740-metric calculation module, 750-weights computing module.

Fig. 9 be pilosity of the present invention penetrate/Dynamic Programming in multiple receive antenna MIMO and the orthogonal frequency division multiplex OFDM signal transmitter/receiver detects schematic diagram.

Embodiment

Embodiment

Describe the preferred embodiment of the invention in detail below with reference to accompanying drawing.

Pilosity of the present invention penetrates/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver embodiment in, transmitting terminal by channel coding module 100, baseband modulation mapping block 200, MIMO coding module 300, insert pilot module 260, OFDM modulation module 400 and N _tModules such as individual rf transmitter unit 2 constitute; Correspondingly, at receiving terminal by N _rIndividual rf receiver unit 3, OFDM demodulation module 500, pilot tone separation module 280, channel estimation module 600, MIMO decoding module 700, rectification mapping block 800 and channel decoding module 900 constitute.Wherein, MIMO coding module 300 is made up of string and modular converter 310, delay arrangement module 320 and monocycle random interleaving module 330; The OFDM modulation/demodulation modules is made up of fast fourier transform IFFT module 410, insertion cyclic prefix CP module 420, modulation module 430, demodulation module 510, removal cyclic prefix CP module 520 and Fourier transform FFT module 530; MIMO decoding module 700 is formed by separating monocycle interleaving block 710, memory module 730, control module 720, metric calculation module 740 and weights calculating mould 750.

Penetrate/transmitting terminal of multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver by the pilosity of the present invention that hardware constitutes:

Channel coding module 100 is carried out chnnel coding by convolution code to user input data bit stream 1, is about to input traffic 1 and is divided into some groups, and every group of data are (b ₁, b ₂, K, b _K-Nt+1), every group length is K-N _t+ 1, K is the sub-carrier number that system is used to send signal, N _tBe number of transmit antennas, coding back data are

Length is 2 (K-N _t+ 1), chnnel coding is in order to improve the reliability that data are transmitted in channel.Certainly, also can adopt other channel coding technologies.

(quadriphase PSK: the data after QuadriPhase Shift Keying) mode is encoded to channel coding module 100 are carried out baseband modulation becomes symbols streams to modulation mapping block 200 according to QPSK.Per two bits are mapped to a symbol, and the symbol that the modulation back is every group is (s ₁, s ₂, K, s _K-Nt+1).Also can use other modes such as quadrature amplitude modulation QAM, differential phase keying (DPSK) DPSK etc. to carry out the baseband modulation mapping.Next, every group code is encoded by MIMO coding module 300.Wherein, string and modular converter 310 are with symbol sebolic addressing (s ₁, s ₂, K, s _K-Nt+1) and line output.The delay arrangement module 320 also signal of line output is carried out N _tPostpone for-1 time, and keep each result who postpones, so just generate K * N _tMatrix.Monocycle random interleaving module 330 generates new K * N to the capable monocycle random interleaving that carries out of K of this matrix _tMatrix.Here, the monocycle random interleaving is meant when original series has been got all numerals successively according to the order of interleaved sequence, forms a monocycle.Matrix can be described as: $S={(S_1^T,S_2^{T}L{S}_K^T)}^T@{(U_1^T,U_2^T,L,U_N^T)}^T,$ Wherein $N=\frac{C-K}{N_t},$ C is that inverse fast fourier transform IFFT module 410 and Fourier direct transform FFT module 530 are done counting of inverse fast fourier transform and direct transform in the OFDM modulation/demodulation modules, $S_i=(s_{i,1}^{\′},s_{i,2}^{\′},L,s_{i,N_t}^{\′}),$ i＝1，2，L?K； $U_j={(S_{(j-1)M+1}^T,S_{(j-1)M+2}^T,L,S_{\mathrm{jM}}^T)}^T,$ j＝1，2，L?N。

Insert pilot tone from the sign matrix of MIMO coding module 300 outputs by inserting pilot module 260.

Pilot matrix: $P={\left(\begin{array}{ccc}p& & 0\\ & O& \\ 0& & p\end{array}\right)}_{N_t\&times;N_t}=({\mathrm{<figure-callout\; id="1"\; label="pe"\; filenames="A20041008422700161.png,A20041008422700192.png"\; state="\{\{state\}\}">pe</figure-callout>}}_1,{\mathrm{<figure-callout\; id="2"\; label="pe"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">pe</figure-callout>}}_2,L,{\mathrm{pe}}_{N_t}),p=\frac{1}{\sqrt{2}}(1+i),$ This value is 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 $M=\frac{K}{N}$ Individual S _iRow inserts a P, promptly every a U _iInsert one.Obtain the result $S^{\&prime;}={(P,U_1^T,P,U_2^T,L,P,U_N^T)}^T@({\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="A20041008422700161.png,A20041008422700192.png"\; state="\{\{state\}\}">S</figure-callout>}}_1^{\&prime;},{\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">S</figure-callout>}}_2^{\&prime;},L,S_{N_t}^{\&prime;}),$ Be a C * N _tMatrix, wherein, $S_i^{\&prime;}={({\mathrm{pe}}_I^T,U_{1i}^T,{\mathrm{pe}}_i^T,U_{2i}^T,L,{\mathrm{pe}}_i^T,U_{N_i}^T)}^T,$ U _ji@(s _(j-1)M+1，i′，s _(j-1)M+2，i′，L，s _jM，i′) ^T，i＝1，2，L?N _t，j＝1，2，L?N。

Then, the N of matrix _tRow are admitted to N respectively _tIndividual OFDM modulation module 400.In modulating in OFDM module 400, C data, i.e. S in 410 pairs of frequency domains of fast fourier transform IFFT module _i' carry out inverse fast fourier transform, generate C sample number strong point S in the time domain _i".Because orthogonal frequency division multiplex OFDM adopts Cyclic Prefix can eliminate intersymbol interference fully, insert 420 couples of S of cyclic prefix module so use _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 430 with symbol sebolic addressing, sends into radio frequency part at last by N _t Individual antenna 2 sends.

Pilosity of the present invention penetrates/receiving terminal of multiple receive antenna MIMO orthogonal frequency division multiplex OFDM signal transmitter/receiver:

N _rAfter individual antenna 3 receives signal symbol sequence,, be total to N by orthogonal frequency division multiplex OFDM demodulation module 500 demodulation orthogonal frequency division multiplex OFDM symbols _rThe road.Concrete steps are as follows:

At first, the length that will receive from antenna 3 by demodulation module 510 be the symbol sebolic addressing of 5C/4 by carrier wave demodulation to base band.Then, removing cyclic prefix module 520 is the Cyclic Prefix removal of C/4 with length in the received signal.Then, the C point time domain samples data point that 530 pairs of Fourier transform FFT modules obtain is carried out fast fourier transform, generates C point frequency domain data.Wherein, N _rThe symbol sebolic addressing of road orthogonal frequency division multiplex OFDM demodulation module 500 outputs is respectively $R_i={(p_{1i}^T,V_{1i}^T,p_{2i}^T,V_{2i}^T,L,p_{\mathrm{Ni}}^T,V_{\mathrm{Ni}}^T)}^T,$ p _Ij@ (p _{Ij, 1}, p _{Ij, 2}, L, p _{Ij, k}, L, p _{Ij, Nt}), be the sequence of pilot symbols piece that receiving terminal obtains, k=1,2, L, N _t, V _Ji@ (r _{(j-1) M+1, i}, r _{(j-1) M+2, i}, L, r _{JM, i}) ^TBe the information symbol sequence piece i=1 that receiving terminal obtains, 2, L N _r, j=1,2, L N.Then, pilot tone separation module 280 is separated above-mentioned sequence of pilot symbols piece and information symbol sequence piece, and sends into channel estimation module 600 by the sequence of pilot symbols piece, and channel estimation module 600 uses the linear interpolation channel estimation methods to obtain channel parameter h _Ij ^k(k=1,2 ..., K; I=1,2 ..., N _tJ=1,2 ..., N _r).Channel parameter and information sequence piece are sent into pilosity and are penetrated/multiple receive antenna MIMO decoding module 700, carry out MIMO decoding by Dynamic Programming.Pilosity penetrates/and that multiple receive antenna MIMO decoding module 700 decoding Dynamic Programming detection methods specifically detect step is as follows:

A. separate monocycle interleaving block 710 the information sequence piece is merged, obtain r _n ^k(n=1,2, L, N _rK=1,2, L K), separates monocycle respectively to it and interweaves, and obtains r _n' ^k(n=1,2, L, N _rK=1,2, L, K);

B. with storage estimate symbol  in the memory module 730 _i(N _t≤ i≤0) memory cell zero clearing;

C. control module 720 Control Circulation counting unit k assignment 1, and first symbol r in the information symbol sequence that every group of received antenna is received _n' ¹, (n=1, L, N _r), deduct the h of corresponding transmitting antenna 1 reception antenna n in the channel parameter and k=1 _1n ¹With possible estimated value c _j, the product of (j=1,2,3,4), the difference delivery of gained and square after the summation.Find c minimum and that value is corresponding _jAnd assign it to  ₁, and it is deposited in the memory module 730, expression formula is as follows: ${\hat{s}}_1=\arg \underset{c_j}{\min }\underset{n=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{\left|\right|r_n^{\&prime;1}-h_{1\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="A20041008422700161.png,A20041008422700192.png"\; state="\{\{state\}\}">n</figure-callout>}}^1\&CenterDot;c_j\left|\right|}^2$

D. control module 720 Control Circulation counting unit k add up 1, metric calculation module 740 computation measure u _j ²(j=1,2,3,4), computational methods are: second symbol r in the information symbol sequence that every group of received antenna is received _n' ², (n=1, L, N _r) be stored in the arithmetic logic unit alu (Arithmetic Logical Unit), deduct h then _1n ¹With possible estimated value c _j, the product of (j=1,2,3,4) deducts h again _1n ¹With obtain valuation  ₁Product, as index, e obtains power as the truth of a matter after the difference of gained square, summation then as the tolerance in different paths, and deposits it in memory module 730 in, expression formula is as follows:

$u_{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">j</figure-callout>}}^2=\underset{n=1}{\overset{\mathrm{Nr}}{\mathrm{\&Sigma;}}}\exp {({\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">r</figure-callout>}}_2^{\&prime;n}-h_{1\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">n</figure-callout>}}^2\&CenterDot;c_j-h_{2\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A20041008422700161.png,A20041008422700182.png"\; state="\{\{state\}\}">n</figure-callout>}}^2\&CenterDot;{\hat{s}}_1)}^2$

E. control module 720 Control Circulation counting unit k add up 1, k symbol r in the information symbol sequence that weights computing module 750 is received every group of received antenna _n' ^k, (n=1, L, N _r) be stored in the arithmetic logic unit alu, deduct h then _1n ^kWith possible estimated value c _j, the product of (j=1,2,3,4) deducts h _2n ^kWith possible estimated value c _i, the product of (i=1,2,3,4) deducts and has estimated the  that obtains _iWith corresponding h _Mn ^kProduct and, as index, e obtains power as the truth of a matter after the difference of gained square, summation then as the weights in different paths, and deposits it in memory module 730 in, expression formula is as follows:

$e_{i,j}^k@\underset{n=1}{\overset{\mathrm{Nr}}{\mathrm{\&Sigma;}}}\exp {(r_k^{\&prime;n}-h_{1n}^k\&CenterDot;c_j-h_{2n}^k\&CenterDot;c_i-\underset{m=3}{\overset{N_t}{\mathrm{\&Sigma;}}}{h}_{\mathrm{mn}}^k\&CenterDot;{\hat{s}}_{k-m+1})}^2$

F. metric calculation module 740 is taken out k-1 and is gone on foot all possible tolerance and u _i ^K-1(i=1,2,3,4) with go on foot the weights e that k goes on foot all possible path from k-1 _{I, j} ^k(i=1,2,3,4; J=1,2,3,4) multiply each other and get tolerance and the u that minimum value wherein goes on foot as k _j ^k, the pairing c of the i when obtaining minimum value _iAs  _K-1, they are all deposited in the memory module 730, expression formula is as follows:

$u_j^k=\underset{i\&Element;\left\{\mathrm{1,2,3,4}\right\}}{\min }(u_i^{k-1}\&CenterDot;e_{i,j}^k),{\hat{s}}_{k-1}=c_i(i=\arg \underset{i\&Element;\left\{\mathrm{1,2,3,4}\right\}}{\min }(u_i^{k-1}\&CenterDot;e_{i,j}^k)).$

G. if k=K-N _t+ 2, then finish decoding, otherwise, forward the D step to.

In addition, 800 couples of  that obtain of rectification mapping block _i(i=1,2, L, K-N _t+ 1) work is corresponding to the quadriphase PSK QPSK mode demodulation of transmitting terminal, and each symbol is demodulated to two Bit datas.

900 pairs of gained data uses of channel decoding module prior art viterbi decoder is separated the convolution code corresponding to transmitting terminal, finally obtains the required bit data flow of user 4.

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 (9)

1, a kind of pilosity is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, comprise that pilosity penetrates/multiple receive antenna MIMO and orthogonal frequency division multiplex OFDM technology, structure BLAST signal processing technology when empty, space-time trellis codes STTC in the Space Time Coding signal processing method and Space-Time Block Coding STBC, it is characterized in that, utilize related method thereof that signal is carried out diversity, by the monocycle random interleaver signal sequence is upset then, after the receiving terminal deinterleaving, utilize the inhibit signal special construction, carry out pilosity by Dynamic Programming and penetrate/multiple receive antenna MIMO decoding, but the pilosity of application delay and random interleaving method is penetrated/multiple receive antenna OFDM MIMO OFDM transmitter/receiver.Transmitting terminal by channel coding module, baseband modulation mapping block, pilosity penetrate/multiple receive antenna MIMO coding module, insert pilot module, modulating in OFDM module and N _tIndividual rf transmitter unit module constitutes; Receiving terminal is by N _rIndividual rf receiver unit module, orthogonal frequency division multiplex OFDM demodulation module, pilot tone separation module, channel estimation module, pilosity penetrate/and multiple receive antenna MIMO decoding module, rectification mapping block and channel decoding module constitute.

2, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that: pilosity penetrates/multiple receive antenna MIMO coding module by string and modular converter, postpone to arrange module, monocycle random interleaving module is formed; Modulating in OFDM/demodulation module is made up of fast fourier transform IFFT module, insertion cyclic prefix CP module, modulation module, demodulation module, removal cyclic prefix CP module and Fourier transform FFT module; Pilosity penetrates/and multiple receive antenna MIMO decoding module forms by separating monocycle interleaving block, memory module, control module, metric calculation module, weights computing module.

3, pilosity according to claim 1 and 2 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that data rate and bit error rate performance are all when single employing is empty between structure BLAST and the Space-Time Block Coding STBC technology.

4, pilosity according to claim 1 and 2 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, and what it is characterized in that going here and there also modular converter output is the parallel symbol sequence signal; Postpone to arrange module and postpone parallel output signal N _t-1 time, keep each result of delay, arrange and generate K * N _tMatrix signal; Monocycle random interleaving module is to K * N _tMatrix carries out random interleaving with behavior unit, generates K * N _tThe N of matrix signal _tIndividual row, corresponding N _tIndividual transmitting antenna is the symbol sebolic addressing of modulating in OFDM respectively.

5, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that by pilosity penetrate/sign matrix of multiple receive antenna MIMO coding module output inserts pilot tone P signal, insert pilot matrix N altogether, every $M=\frac{K}{N}$ Individual S _iRow inserts a pilot tone P signal.

6, pilosity is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver according to claim 1 or 5, and the signal that it is characterized in that inserting after the pilot tone is a C * N _tMatrix signal

$S_i^{\&prime;}={({\mathrm{pe}}_i^T,U_{1i}^T,{\mathrm{pe}}_i^T,U_{2i}^T,L,{\mathrm{pe}}_i^T,U_{\mathrm{Ni}}^T)}^T,$ U _ji@(s _(j-1)M+1，i′，s _(j-1)M+2，i′，L，s _jM，i′) ^T，i＝1，2，LN _t，j＝1，2，L?N。

7, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that fast fourier transform IFFT module in modulating in OFDM/demodulation module is to the S in the frequency domain _i' inverse transformation generates C sample number strong point S in the time domain _i".

8, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that radio-frequency antenna sends, and receives, and by the orthogonal frequency division multiplex OFDM mark signal of OFDM demodulation module demodulation, is total to N _rThe road.

9, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that the N that receiving terminal is received _rThe signal symbol sequence of road orthogonal frequency division multiplex OFDM demodulation module output is respectively

$R_i={(p_{1i,}^T{V}_{1i}^T,p_{2i}^T,V_{2i}^T,L,p_{\mathrm{Ni}}^T,V_{\mathrm{Ni}}^T)}^T,$ p _Ij@ (p _{Ij, 1}, p _{Ij, 2}, L, p _{Ij, k}, L, p _{Ij, Nt}), the sequence of pilot symbols piece that receiving terminal obtains, k=1,2, L, N _t, and information symbol sequence piece V _Ji@ (r _{(j-1) M+1, i}, r _{(j-1) M+2, i}, L, r _{JM, i}) ^T, i=1,2, L N _r, j=1,2, L N.

10, pilosity according to claim 1 is penetrated/multiple receive antenna MIMO orthogonal frequency division multiplex OFDM transmitter/receiver, it is characterized in that pilosity penetrates/multiple receive antenna MIMO decoding module, the Dynamic Programming detection method step that decoding is adopted is: A. separates the monocycle interleaving block information sequence piece is merged, and obtains r _n ^k(n=1,2, L, N _rK=1,2, L K), separates monocycle respectively to it and interweaves, and obtains r _n' ^k(n=1,2, L, N _rK=1,2, L, K); B. with storage estimate symbol  in the memory module _i(N _t≤ i≤0) memory cell zero clearing; C. control module Control Circulation counting unit k assignment 1, and first symbol r in the information symbol sequence that every group of received antenna is received _n' ¹, (n=1, L, N _r), deduct the h of corresponding transmitting antenna 1 reception antenna n in the channel parameter and k=1 _1n ¹With possible estimated value c _j, the product of (j=1,2,3,4), the difference delivery of gained and square after the summation.Find c minimum and that value is corresponding _jAnd assign it to  ₁, and deposit in the memory module it in expression formula: ${\hat{s}}_1=\arg \underset{c_j}{\min }\underset{n=1}{\overset{N_r}{\mathrm{\&Sigma;}}}{\left|\right|r_n^{\&prime;1}-h_{1n}^1\&CenterDot;c_j\left|\right|}^2;$ D. control module Control Circulation counting unit k adds up 1, metric calculation module computation measure u _j ²(j=1,2,3,4), computational methods are, second symbol r in the information symbol sequence that every group of received antenna is received _n' ², (n=1, L, N _r) be stored in the arithmetic logic unit alu, deduct h then _1n ¹With possible estimated value c _j, the product of (j=1,2,3,4) deducts h again _1n ¹With obtain valuation  ₁Product, as index, e obtains power as the truth of a matter after the difference of gained square, summation then, as the tolerance in different paths and, i.e. the weights sum of all lines on the path, and it is deposited in the memory module, expression formula is:

$u_j^2=\underset{n=1}{\overset{\mathrm{Nr}}{\mathrm{\&Sigma;}}}\exp {(r_2^{\&prime;n}-h_{1n}^2\&CenterDot;c_j-h_{2n}^2\&CenterDot;{\hat{s}}_1)}^2;$ E. control module Control Circulation counting unit k adds up 1, k symbol r in the information symbol sequence that the weights computing module is received every group of received antenna _n' ^k, (n=1, L, N _r) be stored in the arithmetic logic unit alu, deduct h then _1n ^kWith possible estimated value c _j, the product of (j=1,2,3,4) deducts h _2n ^kWith possible estimated value c _i, the product of (i=1,2,3,4) deducts and has estimated the  i and corresponding h that obtain _Mn ^kProduct and, as index, e obtains power as the truth of a matter after the difference of gained square, summation then as the weights in different paths, and deposits it in memory module in, is expressed as follows:

$e_{i,j}^k@\underset{n=1}{\overset{\mathrm{Nr}}{\mathrm{\&Sigma;}}}\exp {(r_k^{\&prime;n}-h_{1n}^k\&CenterDot;c_j-h_{2n}^k\&CenterDot;c_j-\underset{m=3}{\overset{N_t}{\mathrm{\&Sigma;}}}{h}_{\mathrm{mn}}^k\&CenterDot;{\hat{s}}_{k-m+1})}^2;$ F. the metric calculation module is taken out k-1 and is gone on foot all possible tolerance and u _i ^K-1(i=1,2,3,4) with go on foot the weights e that k goes on foot all possible path from k-1 _{I, j} ^k(i=1,2,3,4; J=1,2,3,4) multiply each other and get tolerance and the u that minimum value wherein goes on foot as k _j ^k, the pairing c of the i when obtaining minimum value _iAs  _K-1, they are all deposited in the memory module, expression formula is: $u_j^k=\underset{i\&Element;\left\{\mathrm{1,2,3,4}\right\}}{\min }(u_i^{k-1}\&CenterDot;e_{i,j}^k),$ ${\hat{s}}_{k-1}=c_i(i=\arg \underset{i\&Element;\left\{\mathrm{1,2,3,4}\right\}}{\min }(u_i^{k-1}\&CenterDot;e_{i,j}^k));$ 7, if k=K-N _t+ 2, then finish decoding, otherwise, forward the D step to.

Images