CN100370709C - Multiple code receiver of multiple input and multiple output system - Google Patents

Abstract

The present invention discloses a multiple-code receiver of a multiple-input multiple-output (MIMO) system, which comprises a de-spread unit group and at least two-stage joint detection units, wherein each component of the vector of a received signal is decomposed and spread by the de-spread unit group; the obtained de-spread signal vector is input to a first-stage joint detection unit of the at least two-stage joint detection units; all symbols of a code channel corresponding to each de-spread signal vector are detected by the first-stage joint detection unit in groups; then, the correction of code-domain interference cancellation and the de-spread signal vector are carried out for the signal estimation of all the obtained symbols by detection of each code channel and the estimation of a resultant signal; the corrected de-spread signal vector of each symbol of each code channel is output to a next-stage joint detection unit; processing is carried out step by step until a final-stage joint detection unit receives the corrected de-spread signal vector and obtains the estimation of all the symbols of each code channel. The receiver improves the demodulation performance of multiple-code transmission downlink receiver; therefore, the processing time delay of the receiver is reduced, and the system capacity and peak rate are improved.

Description

A kind of many yards receivers of multi-input multi-output system

Technical field

The present invention relates to wireless communication technology field, be meant many yards receivers of a kind of multiple-input and multiple-output (MIMO, Multiple Input Multiple Output) system especially.

Background technology

MIMO (Multiple Input Multiple Output) technology is the important breakthrough in wireless mobile communications field, and it can improve the capability of communication system and the availability of frequency spectrum exponentially under the situation that does not increase bandwidth.The MIMO technology adopts many antennas (aerial array) to send simultaneously and received signal at transmitting terminal and receiving terminal.Because the signal that each transmitting antenna sends simultaneously takies same frequency band, thereby communication bandwidth does not increase.There is a space channel between each transmitting antenna and each reception antenna.If the channel impulse response of each space channel is independent, then mimo system can be created a plurality of parallel independently space channels by a plurality of transmitting antennas and a plurality of reception antenna between transmitting terminal and receiving terminal.Transmit information independently by these parallel space channels, the transmission data rate of mimo system must be multiplied.G.J.Foschini in 1998 and M.J.Gans have fully proved above-mentioned conclusion, and quantitatively point out: suppose that mimo system has M root transmitting antenna and N root reception antenna, under smooth slow fading channel, just can set up N * M rank channel matrix.This entry of a matrix element is independent identically distributed multiple Gaussian random variable.The channel capacity that mimo system can obtain will be SISO (Single Input Single Output) system min (M, N) (min (m, n) minimum value among m and the n is got in expression) doubly, and total transmitting power remains unchanged.

G.J.Foshini in 1996 have proposed D-BLAST (the Diagonal BLAST of mimo system, BLAST:Bell Laboratories Layered Space-time Architecture) method, this method can realize the demodulation of mimo system, and can obtain the capacity near theoretical capacity 90%.But D-BLAST method complexity is bigger, is difficult for real-time implementation.

1999, G.D.GoldenC, J.Foshini, R.A.Valenzuela and P.W.Wolniansky proposed a kind of BLAST method of simplification--V-BLAST method (Vertical BLAST).This method is in the laboratory real-time implementation.Transmitting terminal and receiving terminal adopt the mimo system of 8 antennas and 12 antennas respectively under indoor environment, when changing in the scope of average SNR at 24dB～34dB, can obtain the spectrum efficiency of 20-40bps/Hz.Although this spectrum efficiency obtains under indoor environment, the spectrum efficiency of this magnitude is unprecedented.Regardless of communication environments and SNR, existing conventional art is the spectrum efficiency that can't obtain this magnitude.But the V-BLAST method also has its weak point: processing delay is bigger.

For solving the deficiency of V-BLAST method, I have proposed a kind of MIMO receiver in another part application.Referring to shown in Figure 1, this receiver comprises grouping detecting unit 102 when detecting unit 101 and parallel vertical layered space during vertical layered space.Wherein, detecting unit 101 received signal vectors during the grouping vertical layered space, symbol to be detected in all received signal vectors is divided into the Z group, detect when finishing the grouping vertical layered space, the received signal vector of correction of exporting all symbols detecting unit 102 during to parallel vertical layered space, the received signal vector of all symbols that detecting unit 101 was revised when detecting unit 102 received through the grouping vertical layered space when walking abreast vertical layered space, after detecting when it is walked abreast vertical layered space, the estimation of exporting each symbol.

The operation principle of this receiver is: detecting unit 101 is divided into the Z group with symbol to be detected in all received signal vectors during the grouping vertical layered space, in first group, walk abreast and carry out the detection of all symbols, obtaining the estimation of all symbols and the signal of all symbols estimates, and the interference of all symbols in from the received signal vector, eliminating first group, the received signal vector that obtains revising, this received signal vector is as first group of detection of being used for second group code for second group input signal, makes the detection of second group code not be subjected to the interference of first group code; With the received signal vector of first group of output as the received signal vector that adopts during each symbol detection in second group, walk abreast and carry out the detection of all symbols, the signal of the estimation of each symbol and all symbols is estimated in obtaining second group, and the interference of all symbols in from the received signal vector of first group of output, eliminating second group, the received signal vector of further being revised, this received signal vector are used for the detection of the 3rd group code as second group of input signal vector to the 3rd group.The rest may be inferred, carries out the detection of other follow-up each group codes.After the detection of finishing the Z group code, the signal that obtains every group code in the Z group is respectively estimated, and the received signal vector of revising through Z group, and then estimate and, obtain the received signal vector of the correction of all symbols through the received signal vector that the Z group is revised by the signal of every group code.At last, export the received signal vector of the correction of all symbols, with its parallel detecting unit 102 when giving parallel vertical layered space.

Above-mentioned MIMO receiver combines Parallel Implementation and the advantage that grouping realizes, has reduced the processing delay of V-BLAST method, and has improved the detection performance.But this MIMO receiver is the MIMO receiver under solid size sends, if transmitting terminal adopts many yards transmissions, then receiving terminal can adopt a plurality of such solid size MIMO receiver demodulation to obtain the symbol sebolic addressing that each code channel sends.But this MIMO receiver can only effectively be eliminated the interference between each symbol in the code channel, but can't eliminate interfering with each other between many yards.

In view of the V-BLAST method is the successive interference cancellation detection method in spatial domain under the solid size, can't eliminate the mutual interference mutually between the code channel and code channel under the many yards transmissions, also the someone proposes sign indicating number territory successive interference cancellation is applied to the V-BLAST method at present, and proposes CD-SIC V-BLAST (Code Domain SerialInterference Cancellation V-BLAST) method and respective receiver.CD-SIC V-BLAST receiver structure as shown in Figure 2.

As seen from Figure 2: code channel k ₀N correlator bank device channel code k ₀Received signal to N root reception antenna is carried out despreading, obtains code channel k ₀The despread signal of following N root antenna.The V-BLAST detector is to code channel k ₀The despread signal of following N root antenna detects and serial spatial domain interference cancellation, obtains code channel k ₀The estimation of following N root antenna transmission symbolic vector

, then in the CD-SIC device the code channel k that has detected ₀Signal from received signal, eliminate, the received signal that obtains revising is vowed Then carry out the demodulation of N root antenna transmission symbolic vector under the next code channel.By this CD-SICV-BLAST method, the performance of mimo system can obtain bigger raising under many yards transmissions.

The thought that above-mentioned sign indicating number territory V-BLAST method adopts serial to offset is eliminated interfering with each other between the different code channels under the many yards transmissions, can improve the demodulation performance of receiver under the many yards transmissions.But the serial of each symbol detects and makes the processing delay of this method very big in successive interference cancellation between the code channel and the sign indicating number, and power system capacity and peak rate are affected.Therefore, this method can not guarantee the performance of receiver under the many yards transmissions.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of receiver, make it can effectively eliminate interfering with each other between many yards, and reduce processing delay.

In order to achieve the above object, the invention provides a kind of many yards receivers of multi-input multi-output system, this receiver comprises:

Despread unit group 301 and two-stage joint-detection unit 305 at least, wherein,

Each despread unit is carried out despreading with each component in the received signal vector in the despread unit group 301, and of will obtain inputed to first order joint-detection unit 302 in the described joint-detection of the two-stage at least unit 305 with last despread signal vector; All symbols carry out detection of packets in the corresponding code channel of each despread signal vector that 302 pairs of first order joint-detection unit receive, the signal that obtains all symbols in each code channel is estimated and the resultant signal estimation, the signal of all symbols of each code channel that will obtain is estimated and resultant signal estimation the carrying out correction of yard territory interference cancellation and despread signal vector then, exporting despread signal vector to the next stage joint-detection unit of correction of each symbol of each code channel handles, until afterbody joint-detection unit 304, the despread signal vector of the 304 pairs of corrections that receive in afterbody joint-detection unit detects, and obtains the estimation of all symbols of each code channel.

Described despread unit group comprised one with last despread unit, wherein, c despread unit with ovsf code c and scrambler to received signal in the vector each component carry out despreading, obtain c despread signal vector.

Described first order joint-detection unit comprises: C first order detecting unit 401 and sign indicating number territory interference cancellation and despread signal vector amending unit 402, wherein,

C first order detecting unit 401 estimates and total signal estimation that by the signal that c despread signal vector obtains yard all symbols of c the signal of all symbols that each first order detecting unit 401 will obtain is respectively estimated and total signal estimates to input to yard territory interference cancellation and despread signal vector amending unit 402; Sign indicating number territory interference cancellation and despread signal vector amending unit 402 are finished the correction of chip-level interference cancellation and despreading signal phasor, obtain the despread signal vector of correction of all symbols of yard 1 to sign indicating number C correspondence; And then export the despread signal vector of each symbol correction to next stage joint-detection unit.

Described c first order detecting unit 401 comprises:

Symbol packets and rearrangement unit 501 are divided into Z with M symbol according to certain criterion by the despread signal vector of input and the estimation of channel matrix _cGroup, and M symbol rearranged according to order of packets and group internal symbol order, and the column vector that will form channel matrix is also reset the new channel matrix of formation, the estimation of despread signal vector and new channel matrix is inputed to first new group of internal symbol detect and interference cancellation unit 502, estimation that simultaneously will new channel matrix exports that all the other new group of internal symbols detect to and interference cancellation unit 502 and export the despread signal vector to new pretreatment unit 503;

Z _cIndividual new group of internal symbol detects and interference cancellation unit 502, wherein, first new group of internal symbol detects symbol detection and the parallel interference cancellation of being finished a group with the interference cancellation unit by the despread signal vector that receives, the despread signal vector that the signal of all symbols is estimated and revised in obtaining organizing, and the signal of all symbols estimated that output delivers to yard territory interference cancellation and despread signal vector amending unit 402, and the despread signal vector of the correction that will obtain exports next new group internal symbol to and detects and the interference cancellation unit; Second to Z _cIndividual new group of internal symbol detects symbol detection and the parallel interference cancellation of being finished a group with the interference cancellation unit by the despread signal vector of the correction that receives, the despread signal vector that the signal of all symbols is estimated and revised in obtaining organizing, and the signal of all symbols estimated that output delivers to yard territory interference cancellation and despread signal vector amending unit 402, and the despread signal vector of the correction that will obtain exports next new group internal symbol to and detects and the interference cancellation unit;

New pretreatment unit 503 is by receiving from Z _cIndividual new group of internal symbol detects the despread signal vector of the correction of exporting with the interference cancellation unit and go out total signal from symbol packets with the despread signal vector of resetting unit output to be estimated, and it is delivered to yard territory interference cancellation and despread signal vector amending unit 402.

Z _cDetection of i new group internal symbol and interference cancellation unit comprise in individual new group of internal symbol detection and the interference cancellation unit 502:

Weight vector computing unit 601 is used for calculating more than one weight vector according to the estimation of the channel matrix of importing, and each weight vector is imported decision-making statistic computing unit 602 successively;

Each decision-making statistic computing unit 602, be used for detecting received signal vector ri and the weight vector revised with the process of interference cancellation unit output and calculate the decision-making statistic, and the decision-making statistic that will calculate is sent to coupled transmission sign estimation unit 603 according to (i-1) individual new group of internal symbol;

Each sends sign estimation unit 603, is used for according to the decision-making statistic of receiving, estimates the estimated value of corresponding symbol in this group and it is delivered to signal estimation and interference cancellation unit 604;

Signal is estimated and interference cancellation unit 604, the signal of finishing all symbols in the group by the received signal vector of the estimated value of all symbols in the group that receives and correction estimate and interference cancellation after, the signal of all symbols is estimated to export to yard territory interference cancellation and despread signal vector amending unit 402, export the despread signal vector of revising to (i+1) individual new group of internal symbol and detect and the interference cancellation unit.

Described sign indicating number territory interference cancellation and despread signal vector amending unit 402 comprise: C spectrum-spreading unit 701, sign indicating number interference cancellation unit, territory 702, a C despread unit 703 and despreading signal phasor amending unit 704,

Wherein, the total signal of the corresponding code channel that each spectrum-spreading unit will receive estimates to carry out spread spectrum, then spread-spectrum signal is exported to a yard interference cancellation unit, territory 702, by interference cancellation unit, sign indicating number territory 702 spread-spectrum signal that receives is carried out interference cancellation, and then will be through the parallel respectively all despread unit 703 that export to of the residual signals that interference cancellation obtains, after despread unit 703 is carried out despreading with each component of the signal that receives, export the despread signal vector that obtains to despread signal vector amending unit 704, the despread signal vector of correction of all symbols of all code channels is exported in the correction that despread signal vector amending unit 704 is finished the despread signal vector.

I in the described joint-detection of the two-stage at least unit 305 (level of a 1＜i＜S) associating detecting unit 303 comprises: C intergrade detecting unit 801 and yard territory interference cancellation and despread signal vector amending unit 802,

Wherein, the estimation that c intergrade detecting unit goes out all symbols of yard c according to the despread signal vector of the correction of all symbols of the sign indicating number c of previous stage joint-detection unit output, and estimate and resultant signal is estimated by the signal that the estimation of each symbol obtains each symbol, then the signal of each symbol is estimated and the resultant signal estimation of sign indicating number c exports yard territory interference cancellation and despread signal vector amending unit 802 to; Sign indicating number territory interference cancellation and despread signal vector amending unit 802 carry out interference cancellation by the received signal vector, and after finishing the correction of the despreading of the residual signals that interference cancellation is obtained and despreading signal phasor, export the despread signal vector of the correction of each symbol of each code channel of obtaining to i+1 level associating detecting unit.

C intergrade detecting unit 801 comprises:

Weight vector computing unit 901 calculates more than one weight vector according to the estimation of channel matrix, and each weight vector is imported decision-making statistic computing unit 902 successively;

Each decision-making statistic computing unit 902 calculates the decision-making statistic according to the received signal vector of the correction of the symbol of the sign indicating number c of i-1 level associating detecting unit output and the weight vector of this symbol, and the decision-making statistic that will calculate is sent to coupled transmission sign estimation unit 903;

Each sends sign estimation unit 903 according to the decision-making statistic of receiving, estimates the estimated value of corresponding symbol and it is delivered to signal estimation unit 904;

Signal estimation unit 904 finishes the signal estimation of all symbols by the estimated value of all symbols of the code channel c that receives and the resultant signal of code channel c is estimated, the signal estimation and the resultant signal of all symbols are estimated to export to yard territory interference cancellation and despread signal vector amending unit 802.

Described afterbody joint-detection unit 304 comprises: C afterbody detecting unit,

Wherein, (estimation that the individual afterbody detecting unit of 1≤c≤C) goes out all symbols of yard c according to the despread signal vector of all symbol corrections of the sign indicating number c of previous stage joint-detection unit output is as last testing result for c.

C afterbody detecting unit 1001 comprises in described C the afterbody detecting unit:

Weight vector computing unit 1101 calculates M weight vector, exports it to 1～M decision-making statistic computing unit 1102 respectively;

The despread signal vector of the correction of weight vector that each decision-making statistic computing unit 502 basis is received and the respective symbol that receives, calculate a decision-making statistic respectively, and then the decision-making statistic that will calculate exports connected transmission sign estimation unit 1103 to;

Send sign estimation unit 1103, estimate symbol according to the decision-making statistic after, directly the sign estimation value is exported as last testing result.

Many yards receivers of mimo system of the present invention are to carry out parallel detection in code channel between each symbol, carry out parallel processing and parallel interference cancellation between each code channel.This receiver can effectively solve the demodulation problem of mimo system under the many yards transmissions, not only improved the demodulation performance of receiver under the many yards transmissions, and the parallel demodulation between a plurality of code channels with parallel offset, the parallel demodulation of each symbol reduces the processing delay of receiver greatly in the code channel, improves power system capacity and peak rate simultaneously.

Description of drawings

Fig. 1 is the structural representation of solid size MIMO receiver in the prior art;

Fig. 2 is a CD-SIC V-BLAST receiver structure schematic diagram in the prior art;

Accent reduces the processing delay of receiver greatly, improves power system capacity and peak rate simultaneously.

Description of drawings

Fig. 1 is the structural representation of solid size MIMO receiver in the prior art;

Fig. 2 is a CD-SIC V-BLAST receiver structure schematic diagram in the prior art;

Fig. 3 is the structural representation of receiver of the present invention;

Fig. 4 is first order joint-detection structure 302 schematic diagrames among Fig. 3;

Fig. 5 is first order detecting unit 401 schematic diagrames of sign indicating number c among Fig. 4;

I new group internal symbol detects and interference cancellation unit 502 structural representations among Fig. 6 Fig. 5;

Fig. 7 is sign indicating number territory interference cancellation and despread signal vector amending unit 402 schematic diagrames among Fig. 4;

Fig. 8 is that (1＜i＜S) level is united detection architecture 303 schematic diagrames to i among Fig. 3;

Fig. 9 is intergrade detecting unit 801 schematic diagrames among Fig. 8;

Figure 10 is S level associating detection architecture 304 schematic diagrames among Fig. 3;

Figure 11 is afterbody detecting unit 1001 structural representations among Figure 10.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

The present invention carries out parallel detection between each symbol in code channel, carry out parallel processing and parallel interference cancellation between each code channel.As shown in Figure 3, MIMO receiver of the present invention comprises despread unit group 301 and joint-detection structure 305.Wherein, despread unit group 301 comprises C despread unit, and joint-detection structure 305 comprises that first order joint-detection structure 302 is to S level associating detection architecture 304.Wherein, despread unit group 301 received signal vectors, and with C despread unit respectively to received signal vector carry out despreading, the despread signal vector with C code channel obtaining inputs to first order joint-detection structure 302 then; First order joint-detection structure 302 respectively the despread signal vector of each code channel is walked abreast detection of packets and interference cancellation, the signal of all symbols of each code channel that will obtain is estimated to estimate to carry out the correction of yard territory interference cancellation and despread signal vector with resultant signal then, the despread signal vector of correction of each symbol of exporting each code channel is to second level joint-detection structure, second level joint-detection structure is similarly handled: the despread signal vector of correction to each symbol of each code channel of input detects, obtain the estimation of each each symbol of code channel, estimation by each each symbol of code channel obtains the signal estimation of each symbol and the resultant signal estimation of each code channel then, follow signal estimation by each symbol of each code channel, the resultant signal of each code channel is estimated and the received signal vector carries out the correction of yard territory interference cancellation and despreading signal phasor, the despread signal vector of correction of renewal of each symbol of exporting each code channel is to next stage joint-detection structure, and subsequent stages joint-detection structure is carried out despread signal vector to the S level associating detection architecture 304 of same processing until the correction of the renewal of each symbol of (S-1) level associating detection architecture 303 each code channel of output.S level associating detection architecture 304 detects the despread signal vector of correction of each symbol of each code channel of receiving respectively, obtains the estimation of all symbols of each code channel.

The signal detection process of MIMO receiver of the present invention is as follows:

If number of transmit antennas is M, the reception antenna of receiver is the N root.The chip-level received signal vector of N dimension is R (t).Transmitting terminal has adopted C ovsf code to carry out the multiplexing transmission of sign indicating number.C ovsf code is respectively: ovsf code c, and c=1,2,3 ..., C.

Under above-mentioned hypothesis, c despread unit carried out despreading with ovsf code c and scrambler to each component among the N dimension baseband receiving signals vector R (t) in the despread unit group, obtains the despread signal vector of 1 N dimension, i.e. Rc, and c=1,2 ..., C.And the despread signal vector that C the N that obtains tieed up inputs in the first order joint-detection structure 302.

As shown in Figure 4, first order joint-detection structure 302 comprises C first order detecting unit 401 and sign indicating number territory interference cancellation and despread signal vector amending unit 402.Wherein, c first order detecting unit 401 estimated and total signal estimation by the signal that c despread signal vector obtains yard all symbols of c.The signal of all symbols that each first order detecting unit 401 will obtain is respectively estimated and total signal estimates to input to yard territory interference cancellation and despread signal vector amending unit 402.Sign indicating number territory interference cancellation and despread signal vector amending unit 402 are finished the correction of chip-level interference cancellation and despreading signal phasor, obtain the despread signal vector of correction of all symbols of yard 1 to sign indicating number C correspondence.And then export the despread signal vector of each symbol correction to second level joint-detection structure 303.

Second level joint-detection structure 303 to (S-1) level associating detection architecture 303 has identical internal structure, as shown in Figure 8.When 1＜i＜S, (i-1) level associating detection architecture comprises C intergrade detecting unit 801 and 1 sign indicating number territory interference cancellation and despread signal vector amending unit 802.Wherein, C intergrade detecting unit 801 receives the despread signal vector of correction of sign indicating number 1 all symbols of upper level joint-detection structure output respectively to the despread signal vector of the correction of all symbols of sign indicating number C.Each intergrade detecting unit 801 is obtained all symbols of corresponding code channel by the despread signal vector detection of the correction of all symbols of the code channel that receives signal estimates and resultant signal is estimated, and the signal of all symbols of this code channel is estimated and the resultant signal estimation exports yard territory interference cancellation and despread signal vector amending unit 802 to.This unit is estimated by the signal of all symbols of 1 to the C code channel that receives and resultant signal is estimated to finish the chip-level interference cancellation, and obtains the despread signal vector of the correction of sign indicating number 1 to sign indicating number C all symbols.Parallel (i+1) level associating detection architecture of sending into of these output signals.Wherein, c intergrade detecting unit 801 estimated and the resultant signal estimation by the signal that detection obtains yard all symbols of c by the despread signal vector of the correction of all symbols of sign indicating number c.

According to above-mentioned processing procedure, finish the signal processing of second level joint-detection structure to the (S-1) joint-detection structure.

As shown in figure 10, S level associating detection architecture comprises C afterbody detecting unit 1001.C afterbody detecting unit 1001 obtained the estimation of all symbols of yard c by the despread signal vector of the correction of all symbols of the sign indicating number c that unites detection architecture from (S-1) level.

Introduce the intergrade detecting unit 801 among first order detecting unit 401, Fig. 8 among Fig. 4, the afterbody detecting unit 1001 among Figure 10 and sign indicating number territory interference cancellation and despread signal vector amending unit 402 below in detail.

Referring to shown in Figure 5, first order detecting unit 401 comprises symbol packets and resets unit 501, Z _cIndividual new group of internal symbol detects and interference cancellation unit 502 and new pretreatment unit 503.

Symbol packets is divided into Z group with M symbol according to certain criterion by the despread signal vector of input and the estimation of channel matrix with rearrangement unit 501, and M symbol rearranged according to order of packets and group internal symbol order, the column vector of correspondingly forming channel matrix is also reset and is formed new channel matrix, and the estimation of despread signal vector and new channel matrix is inputed to first new group of internal symbol detects and interference cancellation unit 502.Simultaneously, the despread signal vector is exported to new pretreatment unit 503, give other new group of internal symbol with the estimation of new channel matrix and detect and interference cancellation unit 502.

New group internal symbol detects symbol detection and the parallel interference of being finished a group with interference cancellation unit 502 by the despread signal vector that receives, obtain organizing the signal estimation of interior all symbols and the despread signal vector of revising, and the signal of all symbols is estimated to deliver to yard territory interference cancellation and despread signal vector amending unit 402 as the output of first order detecting unit.Detect the detection that the despread signal vector of revising with interference cancellation unit 502 is used for next group code through above-mentioned new group of internal symbol.For c first order detecting unit 401, the Z that it comprises _cIndividual new group of internal symbol detects with the interference cancellation unit finishes first group respectively to Z _cThe detection of group code and interference cancellation, and the signal of all symbols estimates to export to yard territory interference cancellation and despread signal vector amending unit 402 in the correspondence group that will obtain.

As shown in Figure 6, newly organizing the internal symbol detection comprises weight vector computing unit 601, decision-making statistic computing unit 602, sends sign estimation unit 603, signal estimation and interference cancellation unit 604 with interference cancellation unit 502.

New pretreatment unit 503 obtains total signal by the despread signal vector from the despread signal vector of the correction of last group and symbol packets and 501 outputs of rearrangement unit to be estimated, and exports this total signal estimation to yard territory interference cancellation and despread signal vector amending unit 402.

If the input signal of c first order detecting unit is R _c, c=1,2,3 ..., C.R _cCan be write as following form:

R _c＝Ha _c+v _c (1a)

Here, R _cSignal phasor for after the despreading of N dimension is obtained by c despread unit in the despread unit group 301; a _c=[a _C1, a _C2..., a _CM] ^TBe that the M dimension sends symbolic vector, this vector is sent by M transmitting antenna later on by ovsf code c and scrambler spread spectrum; H is that N * M ties up channel matrix; v _cExpression N dimension noise vector, its component is independent identically distributed white Gaussian noise.

Order

R _1，c，1＝R _c (1b)

The present invention is with R _{1, c, 1}Be the input signal vector of c first order detecting unit 401 among Fig. 4, set forth the function of each subelement in this unit.

Wherein, symbol packets is as follows with rearrangement unit 501 functions:

Symbol packets and rearrangement unit 501 are by despread signal vector R _{1c, 1}With the estimation of channel matrix H according to certain criterion with M symbol a _C1, a _C2..., a _CMBe divided into Z _cGroup, i (i=1,2 ..., Z _c) the group code number is L _{C, i}I organizes L _{C, i}Individual symbol is b _Ci1, b _Ci2..., b _{CiLc, i}Wherein, $b_{\mathrm{cij}}=a_{c{M}_{c,i,j}}$ (span of j changes with group number i, and span is: j=1, and 2 ..., L _{C, i}), to organize j symbol sequence number in assemble of symbol originally be M to i under this expression code channel c _{C, i, j}(M _{C, i, j}∈ [1,2 ..., M]).Now with symbol sebolic addressing a _C1, a _C2..., a _CMReset, the rearrangement result is: b _C11, b _C12..., b _{C1Lc, 1}, b _C21..., b _{C2Lc, 2}..., b _CZc1..., b _{CZcLc, Zc}Corresponding transmission symbolic vector is converted to: Channel matrix H in the formula (1a) can be write as the form of column vector: H=[H ₁, H ₂..., H _M].To sequence H ₁, H ₂..., H _MCarry out and sequence a _C1, a _C2..., a _CMSame rearrangement, the sequence that obtains are Q _C1, Q _C2..., Q _CMNote Q _c=[Q _C1, Q _C2..., Q _CM].Through H and a _cElement reset, formula (1a) and (1b) can upgrade as follows:

R _1，c，1＝Q _cb _c+v _c (1f)

This symbol packets and the channel matrix Q of rearrangement unit 501 with renewal _cSend to Z _cIndividual new group of internal symbol detects and interference cancellation unit 502.With despread signal vector R _{1, c, 1}Giving first new group of internal symbol detects and interference cancellation unit 502 and new pretreatment unit 503.

New group internal symbol detects with interference cancellation unit 502 functions as follows:

I (i ∈ [1,2 ..., Z _c]) individual new group of internal symbol detects and the interference cancellation unit is R at input despread signal vector _{1, ci}, the group internal symbol add up to L _{C, i}The time, finish L in the group _{C, i}Individual symbol b _Ci1, b _Ciw..., b _{CiLc, i}Detection and the despread signal vector R that obtains revising _{1, c, i+1}

Referring to Fig. 6, i new group internal symbol detects with the interference cancellation unit and finishes following calculating:

Weight vector computing unit 601 calculates each ZF weight vector w according to formula _{1, c, i, j}, j=1,2 ..., L _{C, i}

L _{C, i}Individual decision-making statistic computing unit 602 calculates L concurrently _{C, i}Individual decision-making statistic.J decision-making statistic computing unit 602 calculates j decision-making statistic by j ZF weight vector:

${\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">y</figure-callout>}}_{1,c,i,j}={\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">w</figure-callout>}}_{1,c,i,\mathrm{<figure-callout\; id="1"\; label="j\; T\; R"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">j</figure-callout>}}^T{R}_{}{}_{1,c,i},$ j＝1，2，…，L _c，i(2a)

L _{C, i}Individual sign estimation unit 603 calculates L concurrently _{C, i}The estimation of individual symbol.J sign estimation unit 603 obtains j estimation that sends symbol by j decision-making statistic:

${\hat{b}}_{c,i,j}=D\left({\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">y</figure-callout>}}_{1,c,i,j}\right),$ j＝1，2，…，L _c，i(2b)

Signal is estimated and the estimation of interference cancellation unit 604 by all symbols in the group, is obtained the signal estimation of each symbol and the despread signal vector of revising.The signal of each symbol estimates to be fed to sign indicating number territory interference cancellation and despread signal vector amending unit 402 among Fig. 4, and the despread signal vector of correction is used for the detection of (i+1) group code.

The signal of each symbol is estimated as:

${\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">s</figure-callout>}}_{1,c,M_{c,i,j}}={\hat{b}}_{c,i,j}{\left({\hat{Q}}_c\left(i\right)\right)}_{J+j},$ j＝1，2，…，L _c，i， $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}---\left(2c\right)$

Here, M _{C, i, j}(M _{C, i, j}∈ [1,2 ..., M]) represent that i organizes the sequence number of j symbol in original assemble of symbol.

Estimation for the channel matrix that upgrades.

Can try to achieve like this:

Before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ Classify 0 column vector as, and (J+1) row to M row need be after (i-1) inferior interference cancellation, by pilot frequency sequence to Q _c(J+1) row to the M column weight of matrix newly carries out channel estimating and obtains.If do not carry out channel estimating again, then

Can try to achieve like this: make matrix

In before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ The column vector of row is 0 column vector, and other column vectors are the Q that the last channel estimating obtains _c(J+1) of the estimation of matrix row are listed as to M.(k＜i) individual new group of internal symbol detects with the interference cancellation unit and carries out, then if recent channel estimating is at k

(J+1) row classify as to M

(J+1) row be listed as to M.

The received signal vector of revising is:

${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">R</figure-callout>}}_{1,c,i+1}={\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">R</figure-callout>}}_{1,c,i}-\underset{j=1}{\overset{L_{c,i}}{\mathrm{\&Sigma;}}}{s}_{1,c,M_{c,i,j}},$ j＝1，2，…，L _c，i(2d)

New pretreatment unit 503 functions are as follows:

This unit is by Z _cThe despread signal vector that individual new group of internal symbol detects the correction that obtains with interference cancellation unit 502 is estimated as follows with total signal that yard despread signal vector to c obtains code channel c:

${\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">S</figure-callout>}}_{1,c}={\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">R</figure-callout>}}_{1,c,1}-{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C20041005005400281.png,C20041005005400291.png"\; state="\{\{state\}\}">R</figure-callout>}}_{1,c,Z_c+1}---\left(3\right)$

The internal structure of sign indicating number territory interference cancellation and despread signal vector amending unit 402 as shown in Figure 7, the structure with this unit in other joint-detection structures at different levels is the same.In i level associating detection architecture, sign indicating number territory interference cancellation and despread signal vector amending unit 402 comprise C spectrum-spreading unit 701, sign indicating number interference cancellation unit, territory 702, a C despread unit 703 and despreading signal phasor amending unit 704.Wherein, total signal of the corresponding code channel that each spectrum-spreading unit will receive estimates to carry out spread spectrum, then spread-spectrum signal is exported to a yard interference cancellation unit, territory 702, sign indicating number interference cancellation unit, territory 702 carries out a yard territory interference cancellation with the spread-spectrum signal that receives, obtain residual signals, then residual signals is exported to corresponding despread unit 703 respectively, c despread unit 703 usefulness ovsf code c scramblers each in to the received signal carried out despreading, obtain c despread signal vector, and exporting it to despread signal vector amending unit 704, the despread signal vector of correction of all symbols of all code channels is exported in the correction that despread signal vector amending unit 704 estimates to finish the despread signal vector by the signal of all symbols of c despread signal vector and all code channels.

Its concrete operation principle is as follows:

At first, c spectrum-spreading unit 701 estimated s by the resultant signal of c ovsf code, scrambler and c code channel _{I, c}Obtain the regenerated signal g of c code channel _{I, c}

The regenerated signal of C the code channel that C spectrum-spreading unit 701 obtains is admitted to interference cancellation unit 702.Interference cancellation is finished in this unit, obtains residual signals.Residual signals is calculated as follows:

$R_{i+1}\left(t\right)=R\left(t\right)-\underset{c=1}{\overset{C}{\mathrm{\&Sigma;}}}{g}_{i,c}---\left(4a\right)$

Residual signals is walked abreast sends into C despread unit 703.C c ovsf code of despread unit 703 usefulness and scrambler carry out despreading to each component in the N dimension residual signals of input, obtain despread signal vector R _{I+1, c}

C the despread signal vector that C despread unit 703 obtains all is admitted to the amending unit 704 of despread signal vector.The despread signal vector of correction of each symbol of each code channel is estimated to obtain in this unit by the signal of C despread signal vector and sign indicating number all symbols of 1 to sign indicating number C.The despread signal vector of the correction of j symbol of c the code channel that i level associating detection architecture obtains is as follows:

R _i+1，c，j＝R _i+1，c+s _i，c，j＝1，2，…，M，c＝1，2，…，C (4b)

The despread signal vector of the correction of all symbols is admitted in (i+1) level associating detection architecture.

(structure of c intergrade detecting unit 801 as shown in Figure 9 in the level of 1＜i＜S) the associating detecting unit for i among Fig. 8.The i level that c all symbols of code channel are finished in this unit detects.This unit comprises weight vector computing unit 901, decision-making statistic computing unit 902, sends sign estimation unit 903, signal estimation 904.Weight vector computing unit 901 calculates more than one weight vector according to the estimation of H matrix, and each weight vector is imported decision-making statistic computing unit 902 successively; Each decision-making statistic computing unit 902 is given its despread signal vector of correction of a symbol of code channel c according to (i-1) level associating detection architecture and the weight vector of this symbol calculates the decision-making statistic of this symbol, and the decision-making statistic that will calculate is sent to coupled transmission sign estimation unit 903.Each sends sign estimation unit 903 according to the decision-making statistic of receiving, estimate the estimated value of corresponding symbol and it is delivered to signal estimation unit 904, after the signal that signal estimation unit 904 is finished all symbols of code channel c by the estimated value of all symbols that receive is estimated and the resultant signal of code channel c estimates, the signal of all symbols of code channel c is estimated and the resultant signal estimation exports yard territory interference cancellation and despread signal vector amending unit 802 to.

Wherein, c intergrade detecting unit 801 finished following function:

Weight vector computing unit 901 calculates each ZF weight vector w according to formula _{I, c, j}, j=1,2 ..., M.

902 parallel computation M decision-makings of M decision-making statistic computing unit statistic.I decision-making statistic computing unit 902 calculates j the statistic of making a strategic decision by the despread signal vector of the correction of j ZF weight vector and j symbol: $y_{i,c,j}=w_{i,c,j}^T{R}_{i,c,j},$ j＝1，2，…，M(5a)

M sign estimation unit 903 parallel computation M the estimations that send symbol.J sign estimation unit 903 obtains j estimation (obtaining by soft-decision) that sends symbol by j decision-making statistic: ${\hat{a}}_{i,c,j}=D\left(y_{i,c,j}\right),$ j＝1，2，…，M(5b)

Signal estimation unit 904 is obtained the signal estimation and the resultant signal estimation of M symbol by the estimation of M transmission symbol.

The signal of each symbol is estimated as:

$s_{i,c,j}={\hat{a}}_{i,c,j}{\left(\hat{H}\left(i\right)\right)}_j,$ j＝1，2，…，M，(5c)

Estimation for the channel matrix H upgraded obtains by in the i level matrix H being carried out channel estimating again.

Can try to achieve like this:

Need be after the interference cancellation of previous stage joint-detection structure, each column weight of H is newly carried out channel estimating and obtain by pilot frequency sequence.If do not carry out channel estimating again in the i level, then

Can try to achieve like this:

Equal the estimation of the channel matrix H of the last time.If recent channel estimating (is carried out in the level of k＜i) the associating detection architecture, then at k $\hat{H}\left(i\right)=\hat{H}\left(k\right).$

Resultant signal is estimated as:

$S_{i,c}=\underset{j=1}{\overset{M}{\mathrm{\&Sigma;}}}{s}_{i,c,j},$ j＝1，2，…，M，(5d)

The structure of afterbody detecting unit as shown in figure 11.Make i=S, among Figure 10 in the S level associating detection architecture 304 c afterbody detecting unit 1001 comprise weight vector computing unit 1101, decision-making statistic computing unit 1102, transmission sign estimation unit 1103.Wherein, weight vector computing unit 1101 calculates M weight vector, export it to 1～M decision-making statistic computing unit 1102 respectively, the received signal vector of the correction of weight vector that each decision-making statistic computing unit 1102 basis is received and the respective symbol that receives, calculate a decision-making statistic respectively, and then the decision-making statistic that will calculate exports connected transmission sign estimation unit 1103 to.After transmission sign estimation unit 1103 estimates symbol, directly the sign estimation value is exported as last testing result.

C afterbody detecting unit 1001 finished following function:

Weight vector computing unit 1101 calculates each ZF weight vector w according to formula _{I, c, j}, j=1,2 ..., M.

1102 parallel computation M decision-makings of M decision-making statistic computing unit statistic.J decision-making statistic computing unit 1102 calculates j decision-making statistic by j ZF weight vector according to formula (5a).

M sign estimation unit 1103 parallel computation M the estimations that send symbol.I sign estimation unit 1103 obtains j estimation that sends symbol by j decision-making statistic according to formula (5b).

Despread unit among Fig. 3 and Fig. 7 is finished the despreading to the input signal vector.If c 0VSF sign indicating number is o _c(t), scrambler is s (t).C despread unit is input as signal phasor V (t)=[v that N ties up among Fig. 3 and Fig. 7 ₁(t), v ₂(t) ..., v _N(t)] ^T, the output U of c despread unit then _c(t)=[u _C1(t), u _C2(t) ..., u _CN(t)] ^TCalculate according to following formula:

$u_{\mathrm{cn}}\left(t\right)=\frac{1}{T_s}\underset{T_s}{\&Integral;}{v}_n\left(t\right)o_c\left(t\right)s^{*}\left(t\right),$ n＝1，2，…，N，c＝1，2，…，C (6)

Wherein, T _sThe is-symbol cycle.

In fact, the input signal vector of c despread unit and inequality is respectively received signal vector and residual signals among Fig. 3 and Fig. 7.

Spectrum-spreading unit 701 functions are as follows among Fig. 7:

If the signal phasor U that is input as the N dimension of c spectrum-spreading unit _c(t)=[u _C1(t), u _C2(t) ..., u _CN(t)] ^T, the output V of this unit _c(t)=[v _C1(t), v _C2(t) ..., v _CN(t)] ^TCalculate according to following formula:

v _cn(t)＝u _cn(t)o _c(t)s(t)，n＝1，2，…，N，c＝1，2，…，C (7)

The calculating of weight vector is most important in the first order to the S level associating detection architecture.

Under the ZF criterion, in first order joint-detection structure in c the first order detecting unit group internal symbol of first correction detect with the interference cancellation unit in, can be by the estimation of channel matrix Qc Calculate the ZF weight vector according to formula (8a) and formula (8b):

$G_{c,1}={\left({\hat{Q}}_c\left(1\right)\right)}^{+}---\left(8a\right)$

$w_{c,1,j}={\left(G_{c,1}\right)}_j^T,$ j＝1，2，…，L _c，1(8b)

Wherein, (G _{C, 1}) _jRepresenting matrix G _{C, 1}J capable, symbol T represents transposition, L _{C, 1}The number of the 1st group element under the expression code channel c.

Under the ZF criterion, at i (1＜i≤Z _c) when group code detects, can be by channel matrix

Calculate the ZF weight vector according to formula (8c) and formula (8d):

$G_{c,i}={\left({\hat{Q}}_c\left(i\right)\right)}^{+}---\left(8c\right)$

$w_{c,i,j}={\left(G_{c,i}\right)}_{J+j}^T,$ j＝1，2，…，L _c，i， $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}---\left(8d\right)$

Wherein, L _{C, i}The number of representing the i group element.

Channel matrix Q when being illustrated in the detection of i group _cEstimation.

Do not carrying out under the situation of channel estimating channel matrix again

Before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ Classify 0 column vector as, and (J+1) row are classified the Q of the last time as to M _c(J+1) row of estimation be listed as to M.(k＜i) individual new group of internal symbol detects with the interference cancellation unit and carries out, then if recent channel estimating is at k

(J+1) row classify as to M

(J+1) row be listed as to M.

Again carrying out under the situation of channel estimating channel matrix

Before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ Classify 0 column vector as, and (J+1) row be listed ass by carrying out channel estimating again in i when detection group to M and obtain.Wherein, j ∈ [J+1, M] row pass through Q _cThe j ∈ of matrix [J+1, M] column weight newly carries out channel estimating and obtains.

Under the MMSE criterion, in the detection of group internal symbol and interference cancellation unit of first correction, can be by channel matrix

Calculate weight vector according to formula (9a) and formula (9b):

$G_{c,1}={\mathrm{\&sigma;}}_s^2{F}^H{[{\mathrm{\&sigma;}}_s^2{\mathrm{FF}}^H+{\mathrm{\&sigma;}}^2{I}_M]}^{-1},$ $F=\left({\hat{Q}}_c\left(1\right)\right)---\left(9a\right)$

$w_{c,1,j}={\left(G_{c,1}\right)}_j^T,$ j＝1，2，…，L _c，1(9b)

Under the MMSE criterion, at i (1＜i≤Z _c) when group code detects, can be by channel matrix

Calculate weight vector according to formula (9c) and formula (9d):

$G_{c,1}={\mathrm{\&sigma;}}_s^2{F}^H{[{\mathrm{\&sigma;}}_s^2{\mathrm{FF}}^H+{\mathrm{\&sigma;}}^2{I}_M]}^{-1},$ $F=\left({\hat{Q}}_c\left(i\right)\right)---\left(9c\right)$

$w_{c,i,j}={\left(G_{c,i}\right)}_{J+j}^T,$ j＝1，2，…，L _c，i， $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}---\left(9d\right)$

Do not carrying out under the situation of channel estimating channel matrix again

Before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ Classify 0 column vector as, and (J+1) row are classified the Q of the last time as to M _c(J+1) row of estimation be listed as to M.(k＜i) individual new group of internal symbol detects with the interference cancellation unit and carries out, then if recent channel estimating is at k

(J+1) row classify as to M

(J+1) row be listed as to M.

Again carrying out under the situation of channel estimating channel matrix

Before $J=\underset{k=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{L}_{c,k}$ Classify 0 column vector as, and (J+1) row are listed as by channel estimating to M and obtain.Wherein, j ∈ [J+1, M] row pass through Q _cThe j ∈ of matrix [J+1, M] column weight newly carries out channel estimating and obtains.

The calculating and the ovsf code Taoist monastic name of uniting weight vector in the detection architecture in view of the second level to the S level are irrelevant, so can carry out following designs simplification in above-mentioned a kind of MIMO receiver:

(1＜i＜S) level is united in the detection architecture, and the weight vector computing unit can remove in each intergrade detecting unit at i.And in every grade of associating detection architecture, add a weight vector computing unit, calculate M weight vector according to formula (10).This M weight vector offers C intergrade detecting unit simultaneously.

In the end in the one-level joint-detection structure, the weight vector computing unit can remove in each afterbody detecting unit.And in the end add a weight vector computing unit in the one-level joint-detection structure, make i=S calculate M weight vector according to formula (10).This M weight vector offers C afterbody detecting unit simultaneously.

Under the ZF criterion, at i (in the level of 1≤i≤S) the associating detection architecture, in that carry out again can be by channel matrix under the channel estimation case

Calculate the weight vector of j symbol of code channel c according to formula (10a):

$W_{i,j}=\frac{{\left(\hat{H}\left(i\right)\right)}_j^{*}}{{\left|\right|{\left(\hat{H}\left(i\right)\right)}_j\left|\right|}^2},$ i＝1，…，S；j＝1，2，…，M (10a)

In the following formula, Expression

J row, || B|| ²=B ^HB, B are column vector, It is the estimation of channel matrix H in i level associating detection architecture.

Under the ZF criterion, (1≤i≤S) level is united in the detection architecture, is not carrying out again under the channel estimation case, can be by the estimation of the last channel matrix at i

(k＜i) calculates the weight vector of j the symbol of code channel c according to formula (10b):

$W_{i,j}=\frac{{\left(\hat{H}\left(k\right)\right)}_j^{*}}{{\left|\right|{\left(\hat{H}\left(k\right)\right)}_j\left|\right|}^2},$ i＝2，…，S；j＝1，2，…，M (10b)

Here,

Represent that recent channel estimating (carries out in the level of k＜i) the associating detection architecture at k.

Under the MMSE criterion, at i (in the level of 1≤i≤S) the associating detection architecture, in that carry out again can be by the estimation of channel matrix under the channel estimation case

Calculate j the symbol weight vector of code channel c according to formula (10c):

$w_{i,j}={\left({\mathrm{\&sigma;}}_s^2{F}^H{[{\mathrm{\&sigma;}}_s^2{\mathrm{FF}}^H+{\mathrm{\&sigma;}}^2{I}_M]}^{-1}\right)}^T,$ $F={\left(\hat{H}\left(i\right)\right)}_j---\left(10c\right)$

Wherein, σ ²Be the power of noise component(s) in the received signal vector, σ _s ²For sending the power of symbol.Under the MMSE criterion, at i (in the level of 1≤i≤S) the associating detection architecture, in that do not carry out again can be by the estimation of channel matrix under the channel estimation case

Calculate the weight vector of j the symbol of code channel c according to formula (10d):

$w_{i,j}={\left({\mathrm{\&sigma;}}_s^2{F}^H{[{\mathrm{\&sigma;}}_s^2{\mathrm{FF}}^H+{\mathrm{\&sigma;}}^2{I}_M]}^{-1}\right)}^T,$ $F={\left(\hat{H}\left(k\right)\right)}_j---\left(10d\right)$

Wherein, σ ²Be the power of noise component(s) in the received signal vector, σ _s ²For sending the power of symbol.

In above-mentioned MIMO receiver, the span of progression S is 2≤S＜M.Usually, can determine the value of S according to concrete performance and time delay demand.In general, when S=2 or 3, performance just should be fine, increases the S performance again and also improve not quite.

Group number Z in this MIMO receiver first order structure _cCan set in advance; Can be calculated the SNR of each symbol by channel matrix, the SNR according to each symbol divides into groups to symbol then, and concrete group technology can be used the group technology in the grouping successive interference cancellation GSIC method in the Multiuser Detection.

In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (10)

1. many yards receivers of a multi-input multi-output system is characterized in that, this receiver comprises:

Despread unit group (301) and two-stage joint-detection unit (305) at least, wherein,

Each despread unit is carried out despreading with each component in the received signal vector in the despread unit group (301), and of will obtain inputed to first order joint-detection unit (302) in the described joint-detection of the two-stage at least unit (305) with last despread signal vector; First order joint-detection unit (302) carries out detection of packets to all symbols in the corresponding code channel of each despread signal vector that receives, the signal that obtains all symbols in each code channel is estimated and the resultant signal estimation, the signal of all symbols of each code channel that will obtain is estimated and resultant signal estimation the carrying out correction of yard territory interference cancellation and despread signal vector then, exporting despread signal vector to the next stage joint-detection unit of correction of each symbol of each code channel handles, until afterbody joint-detection unit (304), afterbody joint-detection unit (304) detects the despread signal vector of the correction that receives, obtains the estimation of all symbols of each code channel.

2. receiver according to claim 1, it is characterized in that described despread unit group comprises one with last despread unit, wherein, c despread unit with ovsf code c and scrambler to received signal in the vector each component carry out despreading, obtain c despread signal vector.

3. receiver according to claim 1 is characterized in that, described first order joint-detection unit comprises: C first order detecting unit (401) and sign indicating number territory interference cancellation and despread signal vector amending unit (402), wherein,

C first order detecting unit (401) estimates and total signal estimation that by the signal that c despread signal vector obtains yard all symbols of c the signal of all symbols that each first order detecting unit (401) will obtain is respectively estimated and total signal estimates to input to yard territory interference cancellation and despread signal vector amending unit (402); Sign indicating number territory interference cancellation and despread signal vector amending unit (402) are finished the correction of chip-level interference cancellation and despreading signal phasor, obtain the despread signal vector of correction of all symbols of yard 1 to sign indicating number C correspondence; And then export the despread signal vector of each symbol correction to next stage joint-detection unit.

4. receiver according to claim 3 is characterized in that, described c first order detecting unit (401) comprising:

Symbol packets and rearrangement unit (501) are divided into Z with M symbol according to certain criterion by the despread signal vector of input and the estimation of channel matrix _cGroup, and M symbol rearranged according to order of packets and group internal symbol order, and the column vector that will form channel matrix is also reset the new channel matrix of formation, the estimation of despread signal vector and new channel matrix is inputed to first new group of internal symbol detect and interference cancellation unit (502), estimation that simultaneously will new channel matrix exports that all the other new group of internal symbols detect to and interference cancellation unit (502) and export the despread signal vector to new pretreatment unit (503);

Z _cIndividual new group of internal symbol detects and interference cancellation unit (502), wherein, first new group of internal symbol detects symbol detection and the parallel interference cancellation of being finished a group with the interference cancellation unit by the despread signal vector that receives, the despread signal vector that the signal of all symbols is estimated and revised in obtaining organizing, and the signal of all symbols estimated that output delivers to yard territory interference cancellation and despread signal vector amending unit (402), and the despread signal vector of the correction that will obtain exports next new group internal symbol to and detects and the interference cancellation unit; Second to Z _cIndividual new group of internal symbol detects symbol detection and the parallel interference cancellation of being finished a group with the interference cancellation unit by the despread signal vector of the correction that receives, the despread signal vector that the signal of all symbols is estimated and revised in obtaining organizing, and the signal of all symbols estimated that output delivers to yard territory interference cancellation and despread signal vector amending unit (402), and the despread signal vector of the correction that will obtain exports next new group internal symbol to and detects and the interference cancellation unit;

New pretreatment unit (503) is by receiving from Z _cIndividual new group of internal symbol detects the despread signal vector of the correction of exporting with the interference cancellation unit and go out total signal from symbol packets with the despread signal vector of resetting unit output to be estimated, and it is delivered to yard territory interference cancellation and despread signal vector amending unit (402).

5. receiver according to claim 4 is characterized in that Z _cDetection of i new group internal symbol and interference cancellation unit comprise in individual new group of internal symbol detection and the interference cancellation unit (502):

Weight vector computing unit (601) is used for calculating more than one weight vector according to the estimation of the channel matrix of importing, and each weight vector is imported decision-making statistic computing unit (602) successively;

Each statistic computing unit (602) of making a strategic decision, be used for calculating the decision-making statistic, and the decision-making statistic that will calculate is sent to coupled transmission sign estimation unit (603) according to the received signal vector ri and the weight vector through revising of detection of i-1 new group internal symbol and the output of interference cancellation unit;

Each sends sign estimation unit (603), is used for according to the decision-making statistic of receiving, estimates the estimated value of corresponding symbol in this group and it is delivered to signal estimation and interference cancellation unit (604);

Signal is estimated and interference cancellation unit (604), the signal of finishing all symbols in the group by the received signal vector of the estimated value of all symbols in the group that receives and correction estimate and interference cancellation after, the signal of all symbols is estimated to export to yard territory interference cancellation and despread signal vector amending unit (402), export the despread signal vector of revising to i+1 new group internal symbol and detect and the interference cancellation unit.

6. receiver according to claim 3, it is characterized in that, described sign indicating number territory interference cancellation and despread signal vector amending unit (402) comprising: C spectrum-spreading unit (701), sign indicating number interference cancellation unit, territory (702), a C despread unit (703) and despreading signal phasor amending unit (704)

Wherein, the total signal of the corresponding code channel that each spectrum-spreading unit will receive estimates to carry out spread spectrum, then spread-spectrum signal is exported to a yard interference cancellation unit, territory (702), by interference cancellation unit, sign indicating number territory (702) spread-spectrum signal that receives is carried out interference cancellation, and then will be through the parallel respectively all despread unit (703) that export to of the residual signals that interference cancellation obtains, c despread unit carried out despreading with ovsf code c and scrambler to each component in the input signal vector, obtain c despread signal vector, export the despread signal vector that obtains to despread signal vector amending unit (704), the despread signal vector of correction of all symbols of all code channels is exported in the correction that despread signal vector amending unit (704) is finished the despread signal vector.

7. receiver according to claim 1, it is characterized in that, i level associating detecting unit (303) comprising in the described joint-detection of the two-stage at least unit (305): C intergrade detecting unit (801) and sign indicating number territory interference cancellation and despread signal vector amending unit (802), 1＜i＜S, S are the sum of joint-detection structure;

Wherein, the estimation that c intergrade detecting unit goes out all symbols of yard c according to the despread signal vector of the correction of all symbols of the sign indicating number c of previous stage joint-detection unit output, and estimate and resultant signal is estimated by the signal that the estimation of each symbol obtains each symbol, then the signal of each symbol is estimated and the resultant signal estimation of sign indicating number c exports yard territory interference cancellation and despread signal vector amending unit (802) to; Sign indicating number territory interference cancellation and despread signal vector amending unit (802) carry out interference cancellation by the received signal vector, and after finishing the correction of the despreading of the residual signals that interference cancellation is obtained and despreading signal phasor, export the despread signal vector of the correction of each symbol of each code channel of obtaining to i+1 level associating detecting unit.

8. receiver according to claim 7 is characterized in that, c intergrade detecting unit (801) comprising:

Weight vector computing unit (901) calculates more than one weight vector according to the estimation of channel matrix, and each weight vector is imported decision-making statistic computing unit (902) successively;

Each decision-making statistic computing unit (902) calculates the decision-making statistic according to the received signal vector of the correction of the symbol of the sign indicating number c of i-1 level associating detecting unit output and the weight vector of this symbol, and the decision-making statistic that will calculate is sent to coupled transmission sign estimation unit (903);

Each sends sign estimation unit (903) according to the decision-making statistic of receiving, estimates the estimated value of corresponding symbol and it is delivered to signal estimation unit (904);

Signal estimation unit (904) finishes the signal estimation of all symbols by the estimated value of all symbols of the code channel c that receives and the resultant signal of code channel c is estimated, the signal estimation and the resultant signal of all symbols are estimated to export to yard territory interference cancellation and despread signal vector amending unit (802).

9. receiver according to claim 1 is characterized in that, described afterbody joint-detection unit (304) comprising: C afterbody detecting unit,

Wherein, the estimation that c afterbody detecting unit goes out all symbols of yard c according to the despread signal vector of all symbol corrections of the sign indicating number c of previous stage joint-detection unit output, as last testing result, 1≤c≤C, C are the sum of afterbody detecting unit.

10. receiver according to claim 9 is characterized in that, c afterbody detecting unit (1001) comprising in described C the afterbody detecting unit:

Weight vector computing unit (1101) calculates M weight vector, exports it to 1～M decision-making statistic computing unit (1102) respectively;

The despread signal vector of the correction of weight vector that each decision-making statistic computing unit (1102) basis is received and the respective symbol that receives, calculate a decision-making statistic respectively, and then the decision-making statistic that will calculate exports connected transmission sign estimation unit (1103) to;

Send sign estimation unit (1103), estimate symbol according to the decision-making statistic after, directly the sign estimation value is exported as last testing result.

Images