CN101834693B - Multiple-input multiple-output signal detection method, device and system - Google Patents

Abstract

The invention discloses multiple-input multiple-output signal detection method, device and system. The multiple-input multiple-output signal detection method comprising the following steps of: linearly detecting a received signal to obtain a linear detection quantized value of a transmitting signal, wherein the quantized value is a constellation point on a modulation constellation picture; obtaining a reconstructed received signal by subtracting the channel output of the linear detection quantized value of the first kind of transmitting signals in the received signal, wherein the first kind of transmitting signals are transmitting signals of other transmitting antennae except for a transmitting antenna of a bit to be detected; and carrying out the maximum likelihood decision on the bit to be detected by using the reconstructed received signal to obtain a judgment output value of the bit, wherein in the bit to be detected, signal combination with detected candidate concentration of 0 or 1 is an empty set. Compared with the traditional method which uses a fixed value to replace an LLR (Logarithm Likelihood Ratio) value as judgment output, the multiple-input multiple-output signal detection method has obviously improved detection performance.

Description

A kind of multi-input multi-output signal detection method, Apparatus and system

Technical field

The present invention relates to communication technical field, particularly relate to a kind of multi-input multi-output signal detection method, Apparatus and system.

Background technology

MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) is the key technology of next generation wireless communication.In mimo system, utilize many transmitting antennas and Duo Gen reception antenna to carry out transmission of wireless signals, to compare with traditional single antenna receive-transmit system, mimo system can in the situation that do not increase bandwidth and antenna transmission power, significantly improve the wireless frequency spectrum utilance.

Studies show that at present, in mimo system, adopt ML (Maximum Likelihood, maximum likelihood) detection method can obtain optimum signal detection performance, but the ML detection algorithm of standard often is difficult to realize in actual applications because its complexity is too high.In order to address this problem, people have proposed the ML algorithm of some simplification, such as globular decoding detection algorithm etc., its main thought is to construct less Candidate Set, these Candidate Sets can cover the larger signal combination of possibility effectively, thereby needn't carry out traversal search to the combination of all possible transmitted signal, reduce the complexity of algorithm.

In realizing process of the present invention, the inventor finds that there is following problem at least in said method: although select less Candidate Set can reduce the complexity of ML algorithm, but for certain (or some) transmitted signal bit, may be in Candidate Set this bit be that 0 signal combination is empty set (perhaps this bit is that 1 signal combination is empty set), at this moment, the LLR of this bit (Log-Likelihood Ratio, log-likelihood ratio) can't calculate.In the prior art, be to replace the LLR value of this bit to export as judgement with fixed value, cause the decline that detects performance.

Summary of the invention

In view of this, the invention provides a kind of multi-input multi-output signal detection method, Apparatus and system, to solve in mimo system, replace the LLR value to export the problem of the detection hydraulic performance decline that causes as judgement because using fixed value.Technical scheme is as follows:

The invention provides a kind of MIMO signal detecting method, comprising:

Carry out to received signal linearity test, obtain the linear detection quantized value of transmitted signal, described quantized value is the constellation point on the modulation constellation;

In described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, the transmitted signal of other transmitting antennas;

Use the reception signal of described reconstruct, bit to be detected is carried out maximum likelihood decision, obtain the judgement output valve of this bit;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

The present invention also provides a kind of MIMO signal supervisory instrument, comprising:

The linearity test unit is used for carrying out linearity test to received signal, obtains the linear detection quantized value of transmitted signal, and described quantized value is the constellation point on the modulation constellation;

Reconfiguration unit, be used for by described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, and the transmitted signal of other transmitting antennas;

Decision unit, the reception signal for using described reconstruct carries out maximum likelihood decision to described bit to be detected, obtains the judgement output valve of this bit;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

The present invention also provides a kind of MIMO signal detection system, comprises the detection choice device, the first checkout gear and second detection device;

Described detection choice device be used for to be judged and to be detected Candidate Set, and bit to be detected is that 0 signal combination and this bit are whether 1 signal combination all is nonvoid set, if not, then should be sent to described the first checkout gear by bit to be detected; If so, then should be sent to described second detection device by bit to be detected;

Described the first checkout gear is such as each described device of claim 6 to 9;

Described second detection device is used for calculating the log-likelihood ratio of described detection bit that choice device sends, as the judgement output valve of this bit according to receiving signal.

Technical solution of the present invention, for the transmitted signal bit that in simplifying the ML algorithm, can't calculate LLR, can obtain by the method that reconstruct receives signal the LLR approximation of this bit and as judgement output, replace the LLR value to compare as the method for judgement output with existing use fixed value, detect performance and increase significantly.

Description of drawings

Fig. 1 is the transmission/reception antennas schematic diagram of mimo system;

Fig. 2 is the MIMO signal detecting method flow chart of the embodiment of the invention one;

Fig. 3 is the MIMO signal detecting method flow chart of the embodiment of the invention two;

Fig. 4 is for using the simulation result schematic diagram of technical solution of the present invention;

Fig. 5 is the structural representation of the MIMO signal supervisory instrument of the embodiment of the invention three;

Fig. 6 is the structural representation of the linearity test unit of the embodiment of the invention three;

Fig. 7 is the structural representation of the decision unit of the embodiment of the invention three;

Fig. 8 is the structural representation of the MIMO signal detection system of the embodiment of the invention four.

Embodiment

At first MIMO signal detecting method of the present invention is described, comprising:

Carry out to received signal linearity test, obtain the linear detection quantized value of transmitted signal, described quantized value is the constellation point on the modulation constellation;

In described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, the transmitted signal of other transmitting antennas;

Use the reception signal of described reconstruct, bit to be detected is carried out maximum likelihood decision, obtain the judgement output valve of this bit;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

In order to make those skilled in the art understand better the solution of the present invention, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.

Figure 1 shows that the schematic diagram of mimo system, supposing has N at system's transmitting terminal _TThe root antenna, receiving terminal has N _RThe root antenna.In typical mimo system, the relation that receives signal and transmitted signal can represent with following formula:

r＝Hx+n

Wherein, x represents transmitted signal, $x={[x_1,x_2\&CenterDot;\&CenterDot;\&CenterDot;x_{N_T}]}^T,x_1,{\mathrm{<figure-callout\; id="2"\; label="x"\; filenames="H2009100793835E00022.png"\; state="\{\{state\}\}">x</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;x_{N_T}$ Transmitted signal on the corresponding every transmitting antenna of difference;

R represents to receive signal, $r={[r_1,{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009100793835E00022.png"\; state="\{\{state\}\}">r</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;r_{N_R}]}^T,r_1,{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009100793835E00022.png"\; state="\{\{state\}\}">r</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;r_{N_R}$ The signal that receives on the corresponding every reception antenna respectively;

H represents channel response, is N _R* N _TThe dimension matrix;

N represents additive noise, and obeying average is 0, and variance is 2 σ ²Gaussian Profile, its dimension is N _R* 1.

The principle that ML detects is to find a signal vector

So that receive the reception signal of signal r and reconstruct Between distance minimum.ML detects the combination that needs all possible transmitted signal of traversal search, just can obtain making following formula apart from the signal combination of minimum.Illustrate, if order of modulation is M, then at the total N=2 of modulation constellation ^MIndividual constellation point, then the combination of possible transmitted signal is total

Kind.When using high-order modulating or transmitting antenna number more, its computation complexity of traversal search process that ML detects will be very large.

In the ML algorithm of simplifying, owing to constructed less Candidate Set, thus needn't carry out traversal search to the combination of all possible transmitted signal.But for certain (or some) transmitted signal bit, may be in Candidate Set this bit be that 0 signal combination is empty set (perhaps this bit is that 1 signal combination is empty set), at this moment, the LLR of this bit can't calculate, if replace the LLR value of this bit with a fixed value, the obvious decline that detects performance will be caused.

Embodiment one:

The present invention is directed to transmitted signal bit to be detected and be the signal combination of 0 (or 1) for may be the situation of empty set in Candidate Set, a kind of improved computational methods are provided, replace the LLR value of this bit with result of calculation.Suppose bit to be detected be i (i=1,2 ... N _T) root antenna transmitted signal k (k=1,2 ... M) individual bit, referring to shown in Figure 2, the detection method of this bit may further comprise the steps:

S201 carries out linearity test to received signal, obtains the linear detection quantized value of transmitted signal.

Receiving terminal at first by linear equalization, obtains the estimated value of transmitted signal after receiving signal r

Concrete grammar is as follows:

$\tilde{x}=\mathrm{wr}$

Wherein, linearity test can adopt ZF (ZF) algorithm or minimum mean square error criterion (MMSE) algorithm, and corresponding linear equalization matrix is respectively:

w _ZF＝(H ^HH) ^-1H ^H

$w_{\mathrm{MMSE}}={(H^{H}H+{\mathrm{\&sigma;}}^2{I}_{N_T})}^{-1}{H}^H,$ σ ²Be noise power.

Obtain after the estimated value of transmitted signal, according to modulation constellation, it carried out quantification treatment:

Wherein Q (x) is the quantization algorithm function, and its effect is the constellation point nearest with the Euclidean distance of x on the output modulation constellation, and the form of decision algorithm function determines by modulation system and the specific algorithm that adopts, and the present invention does not need this to limit.

S202 uses the linear detection quantized value, and reconstruct receives signal.

The method that reconstruct receives signal is: the quantized result to the signal of other transmitting antennas except the i root is reconstructed, namely calculate the channel output valve of other transmitting antenna quantized values except the i root, and with the channel output valve of resulting every transmitting antenna by deducting in total reception signal, obtain the reception signal of reconstruct, be implemented as follows:

Wherein, H (:, j) the j row of expression H matrix are namely for the channel response of j root transmitting antenna.

Like this, in the more accurate situation that does not have in other words other antenna transmitted signal reconstruct of error propagation, in the reception signal r of reconstruct, what in fact mainly comprise is the channel output of i root antenna signal transmitted, therefore 0 (or 1) Candidate Set of this each signal bit of transmitting antenna all is not empty, can utilize the ML detection algorithm to obtain the approximate LLR of this each signal bit of transmitting antenna, circular please refer to S203.

S203, the reception signal of use reconstruct carries out maximum likelihood decision to bit to be detected.

In the set of modulation constellation points, find a signal vector s, so that the reception signal r of reconstruct and H (:, i) distance between the s is minimum, according to the algorithm of Maximum Likelihood Detection, can obtain:

$b_i\left(k\right)=\underset{x_i\&Element;{\mathrm{\&Phi;}}_k^0}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)x_i\left|\right|}^2/2{\mathrm{\&sigma;}}^2)-\underset{x_i\&Element;{\mathrm{\&Phi;}}_k^1}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)x_i\left|\right|}^2/2{\mathrm{\&sigma;}}^2)$

Wherein, σ ²Be channel noise power, Φ _k ⁰And Φ _k ¹Be respectively in the modulation constellation points set, k bit is the set of 0 or 1 constellation point:

${\mathrm{\&Phi;}}_k^0=\left\{x_i\right|x_{i,k}=0,x_i\&Element;\mathrm{\&Phi;}\}$

${\mathrm{\&Phi;}}_k^1=\left\{x_i\right|x_{i,k}=0,x_i\&Element;\mathrm{\&Phi;}\}$

x _{I, k}Expression x _iK bit, Φ is modulation constellation points set.

Calculate resulting b _i(k) be i (i=1,2 ... N _T) root antenna transmitted signal k (k=1,2 ... M) the judgement output valve of individual bit in the ML testing process, is used b _i(k) replace the LLR value of this bit, and carry out the operations such as follow-up descrambling and channel decoding.

Embodiment two:

Embodiment one introduced for the transmitted signal bit in Candidate Set be the signal combination of 0 (or 1) for to be the situation of empty set, the detection method of this bit, and for other bits, can still calculate its LLR value.The present embodiment provides a kind of detection method of MIMO signal, and the flow chart of method can referring to shown in Figure 3, may further comprise the steps:

S301, for each signal bit on the every transmitting antenna, if in the detection Candidate Set of structure in advance, this bit is 0 signal combination with this bit is that 1 signal combination all is nonvoid set, then carries out S303, otherwise execution S302.

Transmitted signal $x={[x_1,x_2{\&CenterDot;\&CenterDot;\&CenterDot;x}_{N_T}]}^T$ In, comprise N _TThe signal that the root antenna sends, wherein the signal that sends of every antenna comprises again M bit (M is order of modulation), in the ML algorithm of simplifying, need less Candidate Set Ψ of structure, this Candidate Set should be able to effectively cover the larger transmitted signal combination of possibility.

For i (i=1,2 ... N _T) root antenna transmitted signal k (k=1,2 ... M) individual bit is established Ψ _{I, k} ⁰That this bit is 0 signal combination in Candidate Set, Ψ _{I, k} ¹That this bit is 0 signal combination in Candidate Set:

${\mathrm{\&Psi;}}_{i,k}^0=\left\{x\right|x_k=0\}$

${\mathrm{\&Psi;}}_{i,k}^1=\left\{x\right|x_k=1\}$

If Ψ _{I, k} ⁰And Ψ _{I, k} ¹All be nonvoid set, then carry out S303, otherwise carry out S302.

S302, the method for using embodiment one to provide is calculated the conclusive judgement output valve of this bit.

If for i (i=1,2 ... N _T) root antenna transmitted signal k (k=1,2 ... M) individual bit, Ψ _{I, k} ⁰Or Ψ _{I, k} ¹Be empty set, then calculate the conclusive judgement output valve of this bit by the method for S201-S203.No longer be repeated in this description in the present embodiment.

S303 according to receiving signal, calculates the log-likelihood ratio of bit to be detected, as the conclusive judgement output of this bit.

If for j (i=1,2 ... N _T) the root transmitted signal k (k=1,2 ... M) individual bit, Ψ _{I, k} ⁰And Ψ _{I, k} ¹Not empty set, then obtain its final judgement output valve by the log-likelihood ratio that calculates this bit:

$b_i\left(k\right)=\ln \frac{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})P\left(\hat{x}\right)}{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})P\left(\hat{x}\right)}$

i＝1，2，…N _T；k＝1，2，…M

Wherein, p (x) is the probability of transmitted signal, because each symbol priori in the transmitted signal etc. are general, and the noise Gaussian distributed, therefore can obtain:

$b_i\left(k\right)=\ln \frac{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})P\left(\hat{x}\right)}{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})P\left(\hat{x}\right)}$

$\begin{array}{cc}=\ln \frac{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})}{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\mathrm{\&Sigma;}}p\left(r\right|\hat{x})}& =\ln \frac{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\mathrm{\&Sigma;}}\exp (-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)}{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\mathrm{\&Sigma;}}\exp (-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)}\end{array}$

i＝1，2，…N _T；k＝1，2，…M

According to Jacobian logarithm equation $\ln (e^{{\mathrm{\&alpha;}}_1}+e^{{\mathrm{\&alpha;}}_2})=\max ({\mathrm{\&alpha;}}_1,{\mathrm{\&alpha;}}_2)+\ln (1+e^{-|{\mathrm{\&alpha;}}_1-{\mathrm{\&alpha;}}_2|}),$ And adopt Max-Log_Map approximate, then:

$b_i\left(k\right)=\ln \frac{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\mathrm{\&Sigma;}}\exp (-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)}{\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\mathrm{\&Sigma;}}\exp (-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)}$

$\&ap;\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^0}{\max }(-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)-\underset{\hat{x}\&Element;{\mathrm{\&Psi;}}_{i,k}^1}{\max }(-{\left|\right|r-H\hat{x}\left|\right|}^2/2{\mathrm{\&sigma;}}^2)$

i＝1，2，…N _T；k＝1，2，…M

Through above-mentioned S301-S303 step, can obtain N _TThe output decision value of all signal bit of root transmitting antenna uses these output decision values can carry out the operations such as follow-up descrambling and channel decoding.

Technical scheme provided by the present invention, for the transmitted signal bit that in simplifying the ML algorithm, can't calculate LLR, the method that receives signal by reconstruct obtains this bit LLR approximation, substitute the LLR value with existing use fixed value and compare as the method for judgement output, detect performance and increase significantly.

Figure 4 shows that technical solution of the present invention is applied in N _R=2, N _TSimulation result under=2 the mimo system, the abscissa among the figure represent Es/N0 (signal to noise ratio), and ordinate represents BLER (Block Error Rate).Simulated conditions is as follows: encoder bit rate is 1/3, the signal modulation system is that 16QAM, channel model are the defined ETU channel of 3GPP.As can be seen from Figure, it detects performance the best the ML algorithm of standard, and under the identical prerequisite of Candidate Set size, use technical solution of the present invention, it detects performance and obviously is better than using fixed value to replace original scheme of LLR value: under the condition of BLER=0.1, when Candidate Set is 1, signal-to-noise performance can promote 1.5dB, Candidate Set is can promote 1dB at 8 o'clock, if adopt higher encoder bit rate, performance boost will be more obvious.By it can also be seen that among the figure, when Candidate Set was 8, the ML that the detection performance of technical solution of the present invention has been approached standard detected, and from the complexity aspect, its amount of calculation only is equivalent to about 1/16 of standard ML algorithm, thereby realizability has also obtained significant raising.

Embodiment three:

Corresponding to top embodiment of the method, the present invention also provides a kind of MIMO signal supervisory instrument, and referring to shown in Figure 5, this device comprises:

Linearity test unit 510 is used for carrying out linearity test to received signal, obtains the linear detection quantized value of transmitted signal, and described quantized value is the constellation point on the modulation constellation;

Reconfiguration unit 520, be used for by described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, and the transmitted signal of other transmitting antennas;

Decision unit 530, the reception signal for using described reconstruct carries out maximum likelihood decision to described bit to be detected, obtains the judgement output valve of this bit;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

Referring to shown in Figure 6, described linearity test unit 510 can comprise:

Balanced subelement 511 is used for carrying out to received signal linear equalization, obtains the estimated value of transmitted signal;

Quantize subelement 512, be used for according to modulation constellation, the estimated value of described transmitted signal is carried out quantification treatment, obtain the linear detection quantized value of transmitted signal.

Wherein, the linearity test algorithm of described linearity test unit employing can be zero forcing algorithm or minimum mean square error criterion algorithm.

Referring to shown in Figure 7, described decision unit 530 can comprise gain of parameter subelement 531 and judgement output subelement 532:

Described gain of parameter subelement 531 is used for obtaining following parameter:

In the modulation constellation points set, k bit is the set Φ of 0 constellation point _k ⁰

In the modulation constellation points set, k bit is the set Φ of 1 constellation point _k ¹

The reception signal r of the resulting reconstruct of described reconfiguration unit;

Channel noise power σ ²

The channel response H of i root transmitting antenna (:, i);

Described judgement output subelement 532 for the parameter that obtains according to described gain of parameter subelement 531, obtains the judgement output valve of bit to be detected:

$b_i\left(k\right)=\underset{s\&Element;{\mathrm{\&Phi;}}_k^0}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)-\underset{s\&Element;{\mathrm{\&Phi;}}_k^1}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)$

Wherein, described bit to be detected is k bit of i root transmitting antenna transmitted signal, b _i(k) be the judgement output valve of this bit.

Embodiment four:

The present invention also provides a kind of MIMO signal detection system, referring to shown in Figure 8, comprise and detects choice device 810, the first checkout gears 820 and second detection device 830;

Described detection choice device 810 be used for to be judged and to be detected Candidate Set, and bit to be detected is that 0 signal combination and this bit are whether 1 signal combination all is nonvoid set, if not, then should be sent to described the first checkout gear by bit to be detected; If so, then should be sent to described second detection device by bit to be detected;

Described the first checkout gear 820 is embodiment three described MIMO signal supervisory instruments, and its effect is for the signal bit that can't calculate LLR, uses provided by the present invention improving one's methods to calculate its judgement output valve.

Described second detection device 830 is used for calculating the log-likelihood ratio of described detection bit that choice device sends, as the judgement output valve of this bit according to receiving signal.

For equipment and system embodiment, because it is substantially corresponding to embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method.Equipment and system embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation that do not pay creative work.

For the convenience of describing, be divided into various unit with function when describing above system and describe respectively.Certainly, when enforcement is of the present invention, can in same or a plurality of softwares and/or hardware, realize the function of each unit.

As seen through the above description of the embodiments, those skilled in the art embodiment that can be well understood among the application can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that the technical scheme of embodiment among the application contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out each embodiment among the application or the described method of some part of embodiment.

The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. a multiple-input and multiple-output MIMO signal detecting method is characterized in that, comprising:

Carry out to received signal linearity test, obtain the linear detection quantized value of transmitted signal, described quantized value is the constellation point on the modulation constellation;

In described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, the transmitted signal of other transmitting antennas;

Use the reception signal of described reconstruct, bit to be detected is carried out maximum likelihood decision, obtain the judgement output valve of this bit, specific implementation is:

$b_i\left(k\right)=\underset{s\&Element;{\mathrm{\&Phi;}}_k^0}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)-\underset{s\&Element;{\mathrm{\&Phi;}}_k^1}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)$

Wherein, k the bit that described bit s to be detected is i root transmitting antenna transmitted signal, b _i(k) be the judgement output valve of this bit;

For in the modulation constellation points set, k bit is the set of 0 constellation point;

For in the modulation constellation points set, k bit is the set of 1 constellation point;

S is in the modulation constellation points set, and k bit is that the Element of a set of 0 constellation point or k bit are the Element of a set of 1 constellation point;

Reception signal for described reconstruct;

σ ²Be channel noise power;

H (:, i) be the channel response of i root transmitting antenna;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

2. method according to claim 1 is characterized in that, the described linearity test of carrying out to received signal obtains the linear detection quantized value of transmitted signal, comprising:

Carry out to received signal linear equalization, obtain the estimated value of transmitted signal;

According to modulation constellation, the estimated value of described transmitted signal is carried out quantification treatment, obtain the linear detection quantized value of transmitted signal.

3. method according to claim 1 and 2 is characterized in that, the algorithm of described linearity test is zero forcing algorithm or minimum mean square error criterion algorithm.

4. a multiple-input and multiple-output MIMO signal detecting method is characterized in that, comprising:

Judgement is in detecting Candidate Set, and bit to be detected is 0 signal combination with this bit is whether 1 signal combination all is nonvoid set, if so, then according to the reception signal, calculates the log-likelihood ratio of this bit, as the judgement output valve of this bit; Otherwise, carry out such as each described method of claims 1 to 3.

5. a multiple-input and multiple-output MIMO signal supervisory instrument is characterized in that, comprising:

The linearity test unit is used for carrying out linearity test to received signal, obtains the linear detection quantized value of transmitted signal, and described quantized value is the constellation point on the modulation constellation;

Reconfiguration unit, be used for by described reception signal, deduct the channel output of the linear detection quantized value of first kind transmitted signal, obtain the reception signal of reconstruct, described first kind transmitted signal is: except the transmitting antenna of bit to be detected place, and the transmitted signal of other transmitting antennas;

Decision unit, the reception signal for using described reconstruct carries out maximum likelihood decision to described bit to be detected, obtains the judgement output valve of this bit;

Described decision unit comprises gain of parameter subelement and judgement output subelement:

Described gain of parameter subelement is used for obtaining following parameter:

In the modulation constellation points set, k bit is the set of 0 constellation point

In the modulation constellation points set, k bit is the set of 1 constellation point

In the modulation constellation points set, k bit is that the Element of a set s of 0 constellation point or k bit are the Element of a set s of 1 constellation point;

The reception signal of the resulting reconstruct of described reconfiguration unit

Channel noise power σ ²

The channel response H of i root transmitting antenna (:, i);

Described judgement output subelement for the parameter that obtains according to described gain of parameter subelement, obtains the judgement output valve of bit to be detected:

$b_i\left(k\right)=\underset{s\&Element;{\mathrm{\&Phi;}}_k^0}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)-\underset{s\&Element;{\mathrm{\&Phi;}}_k^1}{\max }(-{\left|\right|\stackrel{\&OverBar;}{r}-H(:,i)s\left|\right|}^2/2{\mathrm{\&sigma;}}^2)$

Wherein, k the bit that described bit s to be detected is i root transmitting antenna transmitted signal, b _i(k) be the judgement output valve of this bit;

Wherein, described bit to be detected is that 0 signal combination is empty set in detecting Candidate Set, perhaps is that 1 signal combination is empty set in detecting Candidate Set.

6. device according to claim 5 is characterized in that, described linearity test unit comprises:

Balanced subelement is used for carrying out to received signal linear equalization, obtains the estimated value of transmitted signal;

Quantize subelement, be used for according to modulation constellation, the estimated value of described transmitted signal is carried out quantification treatment, obtain the linear detection quantized value of transmitted signal.

7. according to claim 5 or 6 described devices, it is characterized in that, the linearity test algorithm of described linearity test unit is zero forcing algorithm or minimum mean square error criterion algorithm.

8. a multiple-input and multiple-output MIMO signal detection system is characterized in that, comprises the detection choice device, the first checkout gear and second detection device;

Described detection choice device be used for to be judged and to be detected Candidate Set, and bit to be detected is that 0 signal combination and this bit are whether 1 signal combination all is nonvoid set, if not, then should be sent to described the first checkout gear by bit to be detected; If so, then should be sent to described second detection device by bit to be detected;

Described the first checkout gear is such as each described device of claim 5 to 7;

Described second detection device is used for calculating the log-likelihood ratio of described detection bit that choice device sends, as the judgement output valve of this bit according to receiving signal.

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