CN101374037A - Method and system for detecting mixing automatic retransmission request signal, and receiving apparatus thereof - Google Patents

Abstract

The invention provides a hybrid automatic repeat request signal detection method, a system and a receiving device thereof. When a receiving terminal detects that the data block which is transmitted for the first time is not received correctly, the channel matrix and the receiving signal at the moment are preserved and a transmitting terminal is notified that the data block is not received correctly, the transmitting terminal receives the notification and then retransmits the data block that is transmitted for the first time; the receiving terminal receives the retransmitted signal for the first time and then calculates to obtain the receiving signal and the channel matrix at the moment, wherein the receiving signal and the channel matrix are respectively combined with the receiving signal and the channel matrix of the first-time transmission moment to allow the combined detection of the multiple signals that are received by the respective channels at the same moment. The receiving device in the corresponding system comprises a channel estimating module, a signal detecting module, a demodulating and channel decoding module and a reception judging module, wherein the signal detecting module serves the function of preservation and combined detection. The detection method, the system and the receiving device can increase the reception diversity gain during the retransmission process and improve the system performance.

Description

The automatic repeat requests signal detecting method of a kind of mixing, system and receiving system thereof

Technical field

The present invention relates to system of broadband wireless communication, more specifically relate to a kind of HARQ (mixing automatic repeat requests) signal detecting method, system and corresponding signal receiving device.

Background technology

The HARQ hybrid automatic repeat request technology is the key technology of HSDPA (high speed downlink packet access), and it can improve the throughput of system.HARQ itself is a kind of error-control schemes that FEC forward error correction and ARQ are combined, that has stipulated in the standard has three kinds of modes, i.e. CC-HARQ, PIR-HARQ and FIR-HARQ, because its good retransmission performance has become one of key technology of next generation wireless communication system.

LTE (Long Term Evaluation) is the Long Term Evolution tissue of 3GPP, through development in recent years, agreement is substantially determined, HARQ is exactly a key technology wherein, in down link, adopt asynchronous self adaptation, up link adopts the synchronous non-self-adapting mode, N step SAW (Stop AndWait, stop to wait for agreement), adopt IR to merge mode, CC (Chase Combining, catch up with merging) be IR (Incremental Redundancy, incremental redundancy) a kind of special case, IR is incorporated in bit-level and finishes, and CC can merge at symbol level also can be in bit level merging.Generally speaking, adopt the HARQ technology in the system, receiver is preserved each data retransmission after testing, carries out symbol level (before the demodulation) merging or bit-level (after the demodulation) then and merges, and utilizes to merge gain raising systematic function.But because its re-transmission gain is limited, can't satisfy the performance requirement of system fully, in the prior art as Block Error Rate, throughput etc.

CC merges to adopt and waits gain also can adopt MRC (high specific merging), and current needs are a kind of can to improve the automatic repeat requests signal detection technique of the mixing scheme that the CC re-transmission gains.

Summary of the invention

Technical problem to be solved by this invention provides a kind of HARQ signal detecting method, system and receiving system thereof, can increase the receive diversity gain when retransmitting, and improves the performance of system.

In order to address the above problem, the invention provides the automatic repeat requests signal detecting method of a kind of mixing, may further comprise the steps:

When (a) receiving terminal detects first the data block that sends and correctly do not received, preserve the channel matrix and the received signal in this moment, and notice transmitting terminal data block do not received correctly, trigger transmitting terminal the signal that sends is first carried out the re-transmission first time;

(b) described receiving terminal is after receiving the signal that described transmitting terminal retransmits for the first time, calculate the received signal and the channel matrix in this moment, received signal and channel matrix with described delivery time first merges respectively, and a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

Further, said method also can have following characteristics: step (b) is further comprising the steps of afterwards:

Described receiving terminal is at each retransmission time, as detect data block and also correctly do not received, then preserve the channel matrix and the received signal of this retransmission time, notice transmitting terminal data block is not correctly received, and transmitting terminal receives that the back retransmits once more to the signal that sends first;

After described receiving terminal is received once more the signal that retransmits, with the channel matrix of current retransmission time and received signal respectively with delivery time of preserving first and the channel matrix and the received signal merging of all retransmission times before, carry out the joint-detection of signal;

By above two step reprocessings, correctly received or reached the maximum retransmission of setting up to data block, finish.

Further, said method also can have following characteristics: in above-mentioned each step received signal merged and be meant and construct a new received signal in the following manner:

R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^TOr R '=[R ' (t ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T

Wherein, R (t _i) be t _iConstantly do not pass through pretreated received signal, R ' (t _i) be t _iPretreated received signal of the moment, R (t _i) and R ' (t _i) being N * 1 n dimensional vector n, N is the reception antenna number, N 〉=1, p is a number of retransmissions, p=1,2 ..., i=1,2 ..., 1+p;

In above-mentioned each step channel matrix merged and is meant and constructs a new channel matrix in the following manner:

H＝[H(t ₁)，H(t ₂)，...，H(t _1+p)] ^T，

H (t wherein _i) be t _iChannel matrix constantly is N * M dimension complex channel matrix, and M is a number of transmit antennas, M 〉=1;

New received signal and channel matrix based on above-mentioned structure carries out input then.

Further, said method also can have following characteristics:

Signal S (the t of the described emission first time ₁)={ s ₁, s ₂..., s _M, be M * 1 n dimensional vector n, described transmitting terminal is to the S (t that transmits retransmitting this signal ₁) resequence and/or multiply by the coherent signal that obtains behind the constant matrices.

Further, said method also can have following characteristics: described transmitting terminal is at t _iSignal S (the t that the moment retransmits _i) be:

Perhaps

Wherein Can get any angle between (0,2 π), t _iBe any retransmission time, i=2 ..., 1+p.

Further, said method also can have following characteristics: described transmitting terminal carries out adopting when signal retransmits the mode of catching up with merging.

Provided by the invention have the signal receiving device that mixes automatic repeat requests function and comprise and be used to carry out the channel estimation module that channel estimating obtains channel matrix, the signal detection module that is used for detecting to received signal, be used for the signal after detecting separated and be in harmonious proportion separating of channel decoding and be in harmonious proportion the channel decoding module, and be used to judge whether data block that channel decoding obtains is correctly received and notify the reception judge module of transmitting terminal, wherein:

Described reception judge module also is used for notifying described signal detection module when data block is not correctly received;

Described signal detection module is used for when current data block is not correctly received, preserve the channel matrix and the received signal of current time, and after receiving re-transmitted signal, with the channel matrix of current retransmission time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge, a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

Further, above-mentioned signal receiving device also can have following characteristics:

Also comprise a pretreatment module, the channel estimate matrix that is used for obtaining according to channel estimation module carries out preliminary treatment to received signal, then pretreated received signal is outputed to signal detection module;

The preservation of described signal detection module and computing based on received signal be pretreated received signal.

Further, above-mentioned signal receiving device also can have following characteristics:

Described signal detection module further comprises memory management unit, detection calculations unit and data merge cells, wherein:

Described memory management unit is used for when the reception judge module judges that current data block is not correctly received, the channel matrix and the received signal of preserving current time;

Described data merge cells be used for retransmission time with the channel matrix of current time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge channel matrix and received signal that structure makes new advances;

Described detection calculations unit is used at retransmission time, detects based on the channel matrix and the received signal of described structure, and at delivery time first, utilizes the channel matrix of current time and received signal to carry out input.

Further, above-mentioned signal receiving device also can have following characteristics:

When merging received signal, described data merge cells constructs a new received signal by following formula:

R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^TOr R '=[R ' (t ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T

Wherein, R (t _i) be t _iConstantly do not pass through pretreated received signal, R ' (t _i) be t _iPretreated received signal of the moment, R (t _i) and R ' (t _i) being N * 1 n dimensional vector n, N is the reception antenna number, N 〉=1, p is a number of retransmissions, p=1,2 ..., i=1,2 ..., 1+p;

Described data merge cells is constructed a new channel matrix by following formula when channel matrix is merged:

H＝[H(t ₁)，H(t ₂)，...，H(t _1+p)] ^T

H (t wherein _i) be t _iChannel matrix constantly is N * M dimension complex channel matrix, and M is a number of transmit antennas, M 〉=1;

Described detection calculations unit is at retransmission time, carries out input based on the new received signal and the channel matrix of above-mentioned structure.

The wireless communication system of employing hybrid automatic repeat request technology provided by the invention comprises transmitting terminal and receiving terminal, and wherein receiving terminal is identical with above-mentioned receiving system, no longer repeats.

Described transmitting terminal also can have following characteristics: the signal S (t of the emission first time ₁)={ s ₁, s ₂..., s _MBe M * 1 n dimensional vector n, at t _iSignal S (the t that the moment retransmits _i) be:

Perhaps

Wherein

Can get any angle between (0,2 π), t _iBe any retransmission time, i=2 ..., 1+p.

Compared with prior art, use the present invention, can increase the receive diversity gain when retransmitting, improve the performance of system.

Description of drawings

Fig. 1 is the flow chart of a kind of HARQ signal detecting method in the specific embodiment of the invention;

Fig. 2 is the fundamental block diagram of MIMO-OFDM transmitter in the specific embodiment of the invention;

Fig. 3 is the fundamental block diagram of MIMO-OFDM receiver in the specific embodiment of the invention;

Fig. 4 is the equal gain combining of AWGN in the specific embodiment of the invention (white Gaussian noise) channel and the performance comparison result schematic diagram of the inventive method.

Embodiment

The main design of the inventive method is: when receiving terminal detects first the data block that sends and correctly do not received, preserve the channel matrix and the received signal in this moment, and require the transmitting terminal re-transmitted signal; After receiving the signal that retransmits for the first time, calculate the channel matrix and the received signal in this moment, with the channel matrix and the merging of pretreated received signal of the delivery time of preserving first, carry out joint-detection.

Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.

Present embodiment is based on adopting the wireless communication system that mixes automatic retransmission technique, and relating generally to wherein has transmitting terminal and receiving terminal, and as shown in Figure 1, the detection method of present embodiment may further comprise the steps:

Step 110, t ₁Constantly, the transmitting terminal S (t that transmits ₁), through wireless channel, receiving terminal is received received signal R (t ₁), carry out channel estimating, preliminary treatment, input, separate the mediation channel decoding, obtain corresponding data block;

Described received signal R (t ₁) be: R (t ₁)=H (t ₁) S (t ₁)+N (t ₁), N (t ₁) be t ₁Moment receiving terminal noise vector, S (t wherein transmits ₁) be M * 1 n dimensional vector n, $S\left(t_1\right)=\{{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">s</figure-callout>}}_{1,\left(t_1\right)},{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">s</figure-callout>}}_{2,\left(t_1\right)},...,s_{M,\left(t_1\right)}\},$ M is a number of transmit antennas, R (t ₁) and N (t ₁) be N * 1 n dimensional vector n, $R\left(t_1\right)=\{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t_1\right)},{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t_1\right)},...,r_{N,\left(t_1\right)}\},$ $N\left(t_1\right)=\{{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{1,\left(t_1\right)},{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{2,\left(t_1\right)},...,n_{N,\left(t_1\right)}\}.$ N is the reception antenna number, and N and M be more than or equal to 1, H (t ₁) be N * M dimension complex channel matrix, have:

In the present embodiment, R (t to received signal ₁) carried out preliminary treatment, through pretreated received signal R ' (t ₁)=U (t ₁) ^HR (t ₁).But for the present invention, this preliminary treatment that relates in other step is optional.The preliminary treatment of present embodiment is to channel matrix H (t _i) carry out svd (singular value decomposition) decomposition (also can adopt other method), obtain two unitary matrix V (t _i), U (t _i) and diagonal matrix D (t _i), D (t wherein _i) the leading diagonal element be two singular values, with received signal R (t _i) multiply by U (t _i) ^H, obtain current pretreated signal R ' (t _i), t wherein _iBe any retransmission time.

Step 120, receiving terminal then send NACK (character unconfirmed) information and give transmitting terminal, and preserve t as judging that current data block is not correctly received ₁Moment channel matrix H (t ₁) and pretreated received signal R ' (t ₁);

If current data block is correctly received, then receiving terminal sends ACK (acknowledge character) information by reverse link and gives transmitting terminal, clear to send end buffer memory; After transmitting terminal was received ACK information, the transmitting terminal buffer memory was removed, and sends new data block.

After step 130, transmitting terminal are received nack message, when not reaching maximum retransmission, retransmit, suppose that retransmission time is t transmitting _1+p, the signal of emission is S (t _1+p), receiving terminal is received received signal R (t _1+p), carry out channel estimating and preliminary treatment, obtain channel matrix H (t _1+p) and pretreated received signal R ' (t _1+p), wherein p is a number of retransmissions, p=1, and 2 ...;

This moment receiving terminal received signal R ' (t _1+p)=U (t _1+p) ^HR (t _1+p), U (t wherein _1+p) ^HBe t _1+pMoment preprocessing vector.

Transmitting terminal has reached maximum retransmission as judging, then begins to send new data, finishes retransmission process.

To the S (t that transmits ₁)={ s ₁, s ₂..., s _MWhen retransmitting, the sequence that transmits can be carried out some conversion increasing coding gain, as multiply by certain constant matrices, sort again etc., as retransmission time transmit can for:

Perhaps

Wherein Can get any angle between (0,2 π), t _iBe any retransmission time, i=2 ..., 1+p.

Step 140, receiving terminal with the received signal of current retransmission time and channel matrix respectively with the described delivery time of preserving first and before the received signal and the channel matrix of all retransmission times merge, a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection;

Received signal R '=[R ' (t is promptly constructed in above-mentioned merging ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T, and channel matrix H=[H (t ₁), H (t ₂) ..., H (t _1+p)] ^T, carry out the detection of signal according to R ' and H then;

If received signal is not passed through preliminary treatment, receiving terminal can directly be constructed received signal R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^T, carry out the joint-detection of signal according to R and H.

The signal detection algorithm of recover transmitting can adopt LMMSE linear minimum mean-squared error, MMSE-SIC continuous interference cancellation algorithm, ML Maximum Likelihood Detection algorithm or any algorithm that can realize this function based on least mean-square error.

Expression formula after the expansion is as follows:

Step 150, to the signal after the joint-detection carry out demodulation, channel decoding obtains respective data blocks, judges whether current data block is correctly received, and in this way, sends ACK information to transmitting terminal, finish this time to retransmit; Otherwise, carry out next step;

Step 160, receiving terminal send NACK (character unconfirmed) information and give transmitting terminal, and preserve the channel matrix and the pretreated received signal of current time, return step 130 then and pair transmit and to carry out next time re-transmission.

As can be seen, this method will be run initially (pretreated with the retransmission time received signal, also can be through pretreated) carry out joint-detection after merging, the received signal that is about to above-mentioned a plurality of moment is carried out input as the received signal of synchronization different antennae, can obtain the receive diversity gain.As when the M=N=1, system is that SISO singly goes into singly to go out system, and this moment, system's equivalence was 12 receive diversity MIMO (multiple-input and multiple-output) antenna of receiving by this algorithm.By diversity reception, performance is better than equal gain combining and MRC merges.

Correspondingly, present embodiment has proposed a kind of signal receiving device of realizing said method, can be with reference to Fig. 3.Comprise channel estimation module, pretreatment module (optional), signal detection module, separate mediation channel decoding module, and receive judge module.Other module and the present invention are irrelevant, do not list one by one at this.Wherein signal detection module and prior art are different.

Channel estimation module is used to carry out channel estimating and obtains channel matrix, outputs to pretreatment module when pretreatment module (no directly output to signal detection module);

Pretreatment module is used for carrying out to received signal preliminary treatment, then pretreated received signal is outputed to signal detection module;

Described signal detection module, be used for when described reception judge module judges that current data block is not correctly received, preserve the channel matrix of current time and received signal (pretreated or do not have pretreated), and after receiving re-transmitted signal (the new data indication NDI that sends in can be according to control information judges that current data block is new data or data retransmission), with the channel matrix of current retransmission time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge, a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

This module further comprises memory management unit, detection calculations unit and data merge cells, wherein:

Memory management unit is used for when the reception judge module judges that current data block is not correctly received the channel matrix and the received signal of preserving current time.

The data merge cells, be used for retransmission time with the delivery time first of the channel matrix of current time and received signal and preservation and before the channel matrix and the received signal of retransmission time merge channel matrix and received signal that structure makes new advances.

The detection calculations unit, be used at retransmission time, carry out input, at delivery time first based on the channel matrix and the received signal of data merge cells structure, utilize the channel matrix and the received signal of current time to carry out input, can adopt various existing algorithms.

Separate mediation channel decoding module, be used for detected signal is separated the mediation channel decoding, obtain data block transmitted.

Receive judge module, be used to judge whether current data block is correctly received, in this way, send ACK information, otherwise send nack message to transmitting terminal and notify described signal detection module to transmitting terminal.

The concrete operation mode of each module can be joined the corresponding contents in the flow process.

Be that an application example is described with pretreated MIMO-OFDM (MIMO-OFDM) system below, but the present invention is applicable to the system of any use HARQ technology.

Fig. 2 and Fig. 3 are the basic transmitter and receiver block diagrams of MIMO-OFDM system, the mimo system of 2 transmit antennas and 2 reception antennas.At transmitting terminal, the independent data bit stream is through the chnnel coding modulation, become the symbol in the signal constellation which, symbol after the modulation carries out time domain according to the OFDM symbolic number that requires in the TTI (Transmission Time Interval) to be cut apart, pass through precoding processing then, data map is to subcarrier, on corresponding pilot sub-carrier, insert frequency pilot sign according to bandwidth requirement then, add Cyclic Prefix, finish the MIMO-OFDM baseband signal and produce this moment, and passages through which vital energy circulates is washed into the type signal and launches simultaneously from many antennas and launch then; After the wireless channel decline, received simultaneously by many antennas from different transmit antennas signal and noise stack back, receiving terminal at first removes CP, convert the signal into frequency domain by FFT (fast fourier transform), carry out channel estimating by frequency pilot sign and obtain channel matrix, utilize channel matrix to carry out corresponding preliminary treatment at receiving terminal from different transmitting antennas to reception antenna.

It is the pretreating scheme of MIMO-OFDM system that this example adopts SVD to decompose precoding.Received signal is after the receiving terminal preliminary treatment, and the entering signal detection module detects the signal on each subcarrier, and the OFDM symbolic solution is multiplexed with modulation symbol, recovers two data flow of transmitting terminal then through demodulation, channel decoding.

Receiving terminal can judge whether send data flow is correctly received according to the check results of CRC (cyclic redundancy check (CRC)) or other error correcting code, if correct the reception sends feeding back ACK information by reverse link.If correctly do not received, feedback NACK give transmitting terminal.

Above-mentioned MIMO-OFDM system signal input/output relation can be expressed as:

R＝HVS+N (2)

In the following formula $S=\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\end{array}\right]$ Be two data flow vector, $V=\left[\begin{array}{cc}{v}_{11}& v_{12}\\ v_{21}& v_{22}\end{array}\right]$ Be the transmitting terminal pre-coding matrix, $H=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ h_{21}& h_{22}\end{array}\right]$ Receive the mimo channel matrixes for 22 that estimate for receiving terminal, $N=\left[\begin{array}{c}{n}_1\\ {\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_2\end{array}\right]$ Be two white Gaussian noises on the reception antenna, $R=\left[\begin{array}{c}{r}_1\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_2\end{array}\right]$ Be two reception antenna signals.Concrete steps are as follows:

Step 1: t ₁Received signal is constantly $R_{\left(t1\right)}=\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t1\right)}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t1\right)}\end{array}\right],$ Estimate the channel matrix of current time according to frequency pilot sign $H_{\left(t1\right)}=\left[\begin{array}{cc}{h}_{11,\left(t1\right)}& h_{12,\left(t1\right)}\\ h_{21,\left(t1\right)}& h_{22,\left(t1\right)}\end{array}\right];$

Step 2: to channel matrix H _(t1)Carry out svd and decompose, obtain the preconditioning matrix U of receiving terminal _(t1), H _(t1)Decomposition obtains two unitary matrix V through svd _(t1), U _(t1)With diagonal matrix D _(t1), D wherein _(t1)The leading diagonal element be two singular values, received signal multiply by U _(t1) ^H(wherein subscript " H " expression conjugate transpose) obtains current pretreated signal $R_{\left(t1\right)}^{\&prime;}=\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t1\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t1\right)}^{\&prime;}\end{array}\right];$

Step 3: continue to t ₁Two data flow that constantly signal detects, demodulation, channel decoding recover transmitting terminal;

Step 4:, then send ACK information by reverse link if Data Receiving is correct; If the Data Receiving mistake sends nack message by reverse link, receiving terminal is preserved t ₁Channel matrix and pretreated signal are promptly constantly: H _(t1) and

Step 5: after transmitting terminal is received nack message, as do not have to retransmit the data of makeing mistakes to maximum retransmission, retransmission time is t ₂, re-transmission can be adopted CC mode, t ₂Received signal constantly is $R_{\left(t2\right)}=\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t2\right)}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t2\right)}\end{array}\right],$

Transmitting terminal has reached maximum retransmission as judging, then begins to send new data, finishes retransmission process.

Step 6: repeating step one and step 2 obtain t ₂Moment channel estimate matrix $H_{\left(t2\right)}=\left[\begin{array}{cc}{h}_{11,\left(t2\right)}& h_{12,\left(t2\right)}\\ h_{21,\left(t2\right)}& h_{22,\left(t2\right)}\end{array}\right],$ Pretreated signal is $R_{\left(t2\right)}^{\&prime;}=\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t2\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t2\right)}^{\&prime;}\end{array}\right];$

Step 7: with t ₁The moment and t ₂Pretreated received signal and channel estimate matrix merge constantly, carry out input, promptly construct received signal and are:

$\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,\left(t\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,\left(t\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{1,(t+1)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2,(t+1)}^{\&prime;}\end{array}\right]=\left[\begin{array}{cc}{h}_{11,\left(t\right)}& h_{12,\left(t\right)}\\ h_{21,\left(t\right)}& h_{22,\left(t\right)}\\ h_{11,(t+1)}& h_{12,(t+1)}\\ h_{21,(t+1)}& h_{22,(t+1)}\end{array}\right]\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\end{array}\right]+\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{1,\left(t\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{2,\left(t\right)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{1,(t+1)}^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="A200710143009E00213.png"\; state="\{\{state\}\}">n</figure-callout>}}_{2,(t+1)}^{\&prime;}\end{array}\right]---\left(3\right)$

The receiving baseband signal model can equivalence be the signal that the mimo system of 2 transmit antennas and 4 reception antennas receives at synchronization in the formula (3).Will recover from received signal and send the detection algorithm that symbol can adopt the multiple MIMO of being suitable for space multiplexing systems such as LMMSE, MMSE-SIC, ML, the present invention does not stipulate this algorithm.

If the signal after after this detecting is through separating the mediation channel decoding, the data block that obtains is judged as and is correctly received, and then receiving terminal returns ack signal to transmitting terminal, finishes retransmission process.Otherwise, receiving terminal also needs to preserve the received signal and the channel matrix of current retransmission time, return the NACK signal to transmitting terminal, and after receiving re-transmitted signal again, with the channel matrix of current retransmission time and received signal respectively with delivery time of preserving first and the channel matrix and the received signal merging of all retransmission times before, carry out input.Afterwards, by with the upper type reprocessing, correctly received or reached maximum retransmission up to data block.

By the same transmit signal is carried out joint-detection in difference received signal constantly, can obtain extra receive diversity gain, its performance is better than the gain that equal gain combining brings.Fig. 4 is the equal gain combining of AWGN in the above-mentioned example (white Gaussian noise) channel and the performance comparison result schematic diagram of the inventive method.As can be seen, detection method provided by the invention is when bler=10%, and performance is better than CC and merges 3dB, and during bler=1%, performance is better than CC and merges 5dB, and the present invention is easy to realize.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (15)

1. one kind is mixed automatic repeat requests signal detecting method, it is characterized in that, may further comprise the steps:

When (a) receiving terminal detects first the data block that sends and correctly do not received, preserve the channel matrix and the received signal in this moment, and notice transmitting terminal data block do not received correctly, trigger transmitting terminal the signal that sends is first carried out the re-transmission first time;

(b) described receiving terminal is after receiving the signal that described transmitting terminal retransmits for the first time, calculate the received signal and the channel matrix in this moment, received signal and channel matrix with described delivery time first merges respectively, and a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

2. the method for claim 1, it is characterized in that: step (b) is further comprising the steps of afterwards:

Described receiving terminal is at each retransmission time, as detect data block and also correctly do not received, then preserve the channel matrix and the received signal of this retransmission time, notice transmitting terminal data block is not correctly received, and transmitting terminal receives that the back retransmits once more to the signal that sends first;

After described receiving terminal is received once more the signal that retransmits, with the channel matrix of current retransmission time and received signal respectively with delivery time of preserving first and the channel matrix and the received signal merging of all retransmission times before, carry out the joint-detection of signal;

By above two step reprocessings, correctly received or reached the maximum retransmission of setting up to data block, finish.

3. method as claimed in claim 1 or 2 is characterized in that:

In above-mentioned each step received signal merged and is meant and constructs a new received signal in the following manner:

R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^TOr R '=[R ' (t ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T

Wherein, R (t _i) be t _iConstantly do not pass through pretreated received signal, R ＇ (t _i) be t _iPretreated received signal of the moment, R (t _i) and R ＇ (t _i) being N * 1 n dimensional vector n, N is the reception antenna number, N 〉=1, p is a number of retransmissions, p=1,2 ..., i=1,2 ..., 1+p;

In above-mentioned each step channel matrix merged and is meant and constructs a new channel matrix in the following manner:

H＝[H(t ₁)，H(t ₂)，...，H(t _1+p)] ^T，

H (t wherein _i) be t _iChannel matrix constantly is N * M dimension complex channel matrix, and M is a number of transmit antennas, M 〉=1;

New received signal and channel matrix based on above-mentioned structure carries out input then.

4. method as claimed in claim 3 is characterized in that:

Signal S (the t of the described emission first time ₁)={ s ₁, s ₂..., s _M, be M * 1 n dimensional vector n, described transmitting terminal is to the S (t that transmits retransmitting this signal ₁) resequence and/or multiply by the coherent signal that obtains behind the constant matrices.

5. method as claimed in claim 4 is characterized in that:

Described transmitting terminal is at t _iSignal S (the t that the moment retransmits _i) be:

Perhaps

Wherein

Can get any angle between (0,2 π), t _iBe any retransmission time, i=2 ..., 1+p.

6. the method for claim 1 is characterized in that:

Described transmitting terminal carries out adopting when signal retransmits the mode of catching up with merging.

7. one kind has the signal receiving device that mixes automatic repeat requests function, comprise and be used to carry out the channel estimation module that channel estimating obtains channel matrix, the signal detection module that is used for detecting to received signal, be used for the signal after detecting separated and be in harmonious proportion separating of channel decoding and be in harmonious proportion the channel decoding module, and be used to judge whether data block that channel decoding obtains is correctly received and notify the reception judge module of transmitting terminal, it is characterized in that:

Described reception judge module also is used for notifying described signal detection module when data block is not correctly received;

Described signal detection module is used for when current data block is not correctly received, preserve the channel matrix and the received signal of current time, and after receiving re-transmitted signal, with the channel matrix of current retransmission time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge, a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

8. signal receiving device as claimed in claim 7 is characterized in that:

Also comprise a pretreatment module, the channel estimate matrix that is used for obtaining according to channel estimation module carries out preliminary treatment to received signal, then pretreated received signal is outputed to signal detection module;

The preservation of described signal detection module and computing based on received signal be pretreated received signal.

9. as claim 7 or 8 described signal receiving devices, it is characterized in that:

Described signal detection module further comprises memory management unit, detection calculations unit and data merge cells, wherein:

Described memory management unit is used for when the reception judge module judges that current data block is not correctly received, the channel matrix and the received signal of preserving current time;

Described data merge cells be used for retransmission time with the channel matrix of current time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge channel matrix and received signal that structure makes new advances;

Described detection calculations unit is used at retransmission time, detects based on the channel matrix and the received signal of described structure, and at delivery time first, utilizes the channel matrix of current time and received signal to carry out input.

10. signal receiving device as claimed in claim 9 is characterized in that:

When merging received signal, described data merge cells constructs a new received signal by following formula:

R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^TOr R '=[R ' (t ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T

Wherein, R (t _i) be t _iConstantly do not pass through pretreated received signal, R ＇ (t _i) be t _iPretreated received signal of the moment, R (t _i) and R ＇ (t _i) being N * 1 n dimensional vector n, N is the reception antenna number, N 〉=1, p is a number of retransmissions, p=1,2 ..., i=1,2 ..., 1+p;

Described data merge cells is constructed a new channel matrix by following formula when channel matrix is merged:

H＝[H(t ₁)，H(t ₂)，...，H(t _1+p)] ^T

H (t wherein _i) be t _iChannel matrix constantly is N * M dimension complex channel matrix, and M is a number of transmit antennas, M 〉=1;

Described detection calculations unit is at retransmission time, carries out input based on the new received signal and the channel matrix of above-mentioned structure.

11. wireless communication system that adopts hybrid automatic repeat request technology, comprise transmitting terminal and receiving terminal, wherein receiving terminal comprises channel estimation module, signal detection module, separates mediation channel decoding module, and be used to judge whether data block that channel decoding obtains is correctly received and notify the reception judge module of transmitting terminal, it is characterized in that:

Described reception judge module also is used for notifying described signal detection module when data block is not correctly received;

Described signal detection module is used for when current data block is not correctly received, preserve the channel matrix and the received signal of current time, and after receiving re-transmitted signal, with the channel matrix of current retransmission time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge, a plurality of signals of receiving on each self-channel as synchronization carry out joint-detection.

12. wireless communication system as claimed in claim 11 is characterized in that:

Also comprise a pretreatment module, the channel estimate matrix that is used for obtaining according to channel estimation module carries out preliminary treatment to received signal, then pretreated received signal is outputed to signal detection module;

The preservation of described signal detection module and computing based on received signal be pretreated received signal.

13., it is characterized in that as claim 11 or 12 described wireless communication systems:

Described signal detection module further comprises memory management unit, detection calculations unit and data merge cells, wherein:

Described memory management unit is used for when the reception judge module judges that current data block is not correctly received, the channel matrix and the received signal of preserving current time;

Described data merge cells be used for retransmission time with the channel matrix of current time and received signal respectively with the delivery time of preserving first and before the channel matrix and the received signal of retransmission time merge channel matrix and received signal that structure makes new advances;

Described detection calculations unit is used at retransmission time, detects based on the channel matrix and the received signal of described structure, and at delivery time first, utilizes the channel matrix of current time and received signal to carry out input.

14. wireless communication system as claimed in claim 13 is characterized in that:

When merging received signal, described data merge cells constructs a new received signal by following formula:

R=[R (t ₁), R (t ₂) ..., R (t _1+p)] ^TOr R '=[R ' (t ₁), R ' (t ₂) ..., R ' (t _1+p)] ^T

Wherein, R (t _i) be t _iConstantly do not pass through pretreated received signal, R ＇ (t _i) be t _iPretreated received signal of the moment, R (t _i) and R ＇ (t _i) being N * 1 n dimensional vector n, N is the reception antenna number, N 〉=1, p is a number of retransmissions, p=1,2 ..., i=1,2 ..., 1+p;

Described data merge cells is constructed a new channel matrix by following formula when channel matrix is merged:

H＝[H(t ₁)，H(t ₂)，...，H(t _1+p)] ^T

H (t wherein _i) be t _iChannel matrix constantly is N * M dimension complex channel matrix, and M is a number of transmit antennas, M 〉=1;

Described detection calculations unit is at retransmission time, carries out input based on the new received signal and the channel matrix of above-mentioned structure.

15. wireless communication system as claimed in claim 14 is characterized in that:

Described transmitting terminal is at the signal S (t that launches for the first time ₁)={ s ₁, s ₂..., s _M, be M * 1 n dimensional vector n, described transmitting terminal is at t _iSignal S (the t that the moment retransmits _i) be:

Perhaps

Wherein

Can get any angle between (0,2 π), t _iBe any retransmission time, i=2 ..., 1+p.

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