WO2012167528A1

WO2012167528A1 - Signal detection method and system for multiple input multiple output antenna system

Info

Publication number: WO2012167528A1
Application number: PCT/CN2011/081077
Authority: WO
Inventors: 严妙奇; 董志峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-09
Filing date: 2011-10-20
Publication date: 2012-12-13
Also published as: CN102820956B; CN102820956A

Abstract

Disclosed is a signal detection method for a Multiple Input Multiple Output antenna system, including: based on a received signal, performing channel estimation to obtain a channel estimation result; based on the signal estimation result, using an interference rejection combining (IRC) detection method to detect the received signal so as to obtain the numerator and denominator of the estimation signal and the numerator and denominator of the corresponding signal to noise ratio; based on the numerator and denominator of the estimation signal and the numerator and denominator of the corresponding signal to noise ratio, using a fast division method so as to obtain an estimation signal and a signal to noise ratio. Also disclosed is a signal detection system for a Multiple Input Multiple Output antenna system. The present invention has a high calculation efficiency, ensures real-time processing of the detection function of the Multiple Input Multiple Output antenna system, and improves the processing ability of the system.

Description

Signal detection method and system for multi-input and output antenna system

The invention belongs to the technical field of wireless communications, and particularly relates to a multi-input and output antenna system

(Multi-Input Multiple-Out-put, MIM0 for short) signal detection method and system. Background technique

In the next generation of wireless communication systems such as Worldwide Interoperability for Microwave Access (WIMAX) and Long Term Evolution (LTE), MIMO is often used to improve spectral efficiency. The MIMO technology refers to a technology that uses multiple transmit antennas and multiple receive antennas for wireless signal transmission. Compared with single antenna technology, MIMO significantly improves the system without increasing system bandwidth and transmit power. Spectrum utilization.

At present, there are two main signal detection methods in MIMO systems: (1) Maximum Likelihood (ML) detection method or simplified ML detection method, and (2) Linear detection method.

The principle of the ML detection algorithm is to exhaust each possible constellation vector according to the constellation set, and perform signal reconstruction according to the estimation of the channel response, calculate the distance between the reconstructed signal and the received signal, and select to make the weight The constellation vector with the smallest distance between the signal and the received signal is used as an estimate of the original signal. This method performs best, but the complexity increases linearly with the number of transmitting antennas and constellation points. The cost realized in multi-antenna systems and high-order systems is too high or even difficult to implement. The simplified method is to narrow down the scope of exhaustive search by certain means.

The linear detection algorithm includes the zero-forcing algorithm and the Minimum Mean Square Error (MMSE) algorithm. Although the linear detection algorithm is not as good as the ML algorithm, its complexity does not increase with the number of constellation points. Moreover, in a multi-antenna system, MMSE The performance of the algorithm is very close to the ML algorithm, but the complexity is much lower. Therefore, in a multi-antenna system, the MMSE detection method is a reasonable solution. However, despite the use of the linear detection algorithm to process the received signal, there are still problems such as high algorithm complexity, low computational efficiency, and heavy system processing burden. Summary of the invention

The technical problem to be solved by the present invention is: The existing signal detection method is used to process the received signal, and the algorithm has high complexity, low computational efficiency, heavy system processing burden, and even difficulty in realizing the problem.

In order to solve the above technical problem, the present invention adopts the following technical solutions:

The present invention provides a signal detection method for a multiple input/output antenna system, including: performing channel estimation based on a received signal to obtain a channel estimation result;

Interference Rejection is used based on the result of the signal estimation

Combining, referred to as IRC, detects the received signal to obtain the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal-to-noise ratio;

Based on the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal to noise ratio, fast division is used to obtain the estimated signal and signal to noise ratio.

Further, the signal detecting method of the multi-input and output antenna system described above further includes: demodulating the likelihood distance of each bit based on the estimated signal and the signal-to-noise ratio as a soft information output.

Further, the step of using the fast division according to the numerator and the denominator of the estimated signal to obtain an estimated signal includes:

Extracting the numerator and denominator of the estimated signal, calculating the sign of the estimated signal; establishing a lookup table of the estimated signal according to the denominator of the estimated signal;

Calculating the sign bit of the absolute value of the denominator of the estimated signal according to the denominator of the estimated signal, and shifting, obtaining the shift value of the sign bit of the absolute value of the denominator of the estimated signal, and extracting the estimated signal The high 8Bit of the shift value of the sign bit of the absolute value of the denominator is used as the denominator search index of the estimated signal;

Calculating a sign bit of the molecular absolute value of the estimated signal according to the numerator of the estimated signal, and performing shifting to obtain a shift value of the sign bit of the molecular absolute value of the estimated signal;

Obtaining an effective value of the estimated signal according to a lookup table of the estimated signal and a lookup index, and a shift value of the sign bit of the estimated molecular absolute value of the signal;

Obtaining a total sign bit based on the sign bit of the absolute value of the denominator of the estimated signal and the sign bit of the molecular absolute value of the estimated signal;

The estimated signal is obtained based on the effective value of the estimated signal and the total sign bit, and the sign of the estimated signal.

Further, the step of using the fast division according to the numerator and the denominator of the corresponding signal to noise ratio to obtain a signal to noise ratio includes:

Extracting the numerator and denominator of the signal-to-noise ratio, and calculating the sign of the signal-to-noise ratio;

Establish a lookup table of signal to noise ratio according to the denominator of the signal to noise ratio;

According to the denominator of the signal-to-noise ratio, the sign bit of the absolute value of the denominator of the signal-to-noise ratio is calculated and shifted to obtain the shift value of the sign bit of the absolute value of the denominator of the signal-to-noise ratio, and the absolute value of the denominator of the signal-to-noise ratio is extracted. The high 8Bit of the shift value of the sign bit is used as the denominator search index of the signal to noise ratio;

Calculating the sign bit of the absolute value of the molecular weight of the signal-to-noise ratio according to the SNR molecule, and shifting to obtain the shift value of the sign bit of the absolute value of the signal-to-noise ratio;

Obtaining a valid value of the signal-to-noise ratio according to the look-up table of the signal-to-noise ratio and the search index, and the shift value of the sign bit of the molecular absolute value of the signal-to-noise ratio;

The sign bit of the absolute value of the denominator of the signal to noise ratio and the sign bit of the molecular absolute value of the signal to noise ratio are obtained as the total sign bit;

The signal-to-noise ratio is obtained from the effective value of the signal-to-noise ratio and the total sign bit, and the sign of the signal-to-noise ratio. Further, the channel estimation is performed based on the received signal, and the knot of the channel estimation is obtained. The steps of the fruit include:

The pilot is used to estimate the channel response and the null carrier is used to estimate the noise floor.

The present invention also provides a signal detection system for a multiple input and output antenna system, comprising: a channel estimation module, configured to perform channel estimation on a received signal to obtain a channel estimation result; and an IRC detection module, configured to: according to the signal Estimating the result, detecting the received signal, obtaining the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal-to-noise ratio; and dividing the module for numerator and denominator of the estimated signal, and phase The numerator and denominator of the corresponding signal-to-noise ratio, using fast division, obtain the estimated signal and signal-to-noise ratio.

Further, the signal detection system of the above multi-input and output antenna system further includes: a demodulation module, configured to demodulate the estimated signal and the signal-to-noise ratio to obtain a likelihood distance of each bit as a soft information output.

Further, the dividing module includes:

a first divider for using the fast division of the numerator and denominator of the estimated signal to obtain an estimated signal;

A second divider for using the fast division of the numerator and denominator of the signal to noise ratio to obtain a signal to noise ratio.

Further, the first divider includes:

a first symbol generating unit, configured to extract a numerator and a denominator of the estimated signal, and calculate a symbol of the estimated signal;

a first index generating unit, configured to: according to a denominator of the estimated signal, establish a lookup table of the estimated signal and calculate a sign bit of the absolute value of the denominator of the estimated signal according to a denominator of the estimated signal, and perform shifting to obtain an absolute value of the denominator of the estimated signal The shift value of the sign bit, and extract the high 8Bit of the shift value of the sign bit of the absolute value of the denominator of the estimated signal as the denominator search index of the estimated signal;

a first shift generating unit, configured to calculate a numerator of the estimated signal according to the numerator of the estimated signal The sign bit of the absolute value, and is shifted to obtain a shift value of the sign bit of the molecular absolute value of the estimated signal;

a first effective value and sign bit generating unit, configured to obtain an effective value of the estimated signal according to a lookup table of the estimated signal and a lookup index, and a shift value of the sign bit of the molecular absolute value of the estimated signal, and an absolute value of the denominator according to the estimated signal The sign bit of the value and the sign bit of the molecular absolute value of the estimated signal yield the total sign bit;

And a first restoring unit, configured to obtain an estimated signal according to the effective value of the estimated signal and the total sign bit, and the sign of the estimated signal.

Further, the second divider includes:

a second symbol generating unit, configured to extract a numerator and a denominator of the signal to noise ratio, and calculate a symbol of a signal to noise ratio;

a second index generating unit, configured to establish a signal to noise ratio lookup table according to a denominator of the signal to noise ratio, and calculate a sign bit of the absolute value of the denominator of the signal to noise ratio according to a denominator of the signal to noise ratio, and perform shifting to obtain a signal noise The shift value of the sign bit of the absolute value of the denominator, and extract the high 8Bit of the shift value of the sign bit of the absolute value of the denominator of the signal to noise ratio as the denominator search index of the estimated signal;

a second shift generating unit, configured to calculate a sign bit of a molecular absolute value of the signal-to-noise ratio according to a SNR molecule, and perform shifting to obtain a shift value of a sign bit of a molecular absolute value of the signal-to-noise ratio; a second effective value and sign bit generating unit, configured to obtain a signal-to-noise ratio effective value and an estimated signal according to a signal-to-noise ratio lookup table and a lookup index, and a shift value of a sign bit of a molecular absolute value of the signal to noise ratio The sign bit of the absolute value of the denominator and the sign bit of the molecular absolute value of the estimated signal get the total sign bit;

The second restoration unit is configured to obtain a signal to noise ratio according to the effective value of the signal to noise ratio and the total sign bit, and the sign of the signal to noise ratio.

The beneficial effects of the invention are as follows: In the signal detection process, the principle of linear detection of IRC is appropriately simplified, the operation of matrix inversion is avoided, the complexity of the algorithm is reduced, and the complexity is improved. The operation efficiency, in addition, the invention also adopts fast division, further improves the efficiency of signal detection, ensures real-time processing of the MIMO detection function, and improves the processing capability of the system. DRAWINGS

1 is a block diagram showing an embodiment of a signal detecting system of a multiple input/output antenna system according to the present invention;

2 is a schematic flow chart of an embodiment of a signal detecting method of a multiple input/output antenna system according to the present invention;

3 is a schematic block diagram of the dividing module 13 shown in FIG. 1;

4 is a block diagram of the first divider 131 shown in FIG. Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments in order to make the present invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Please refer to FIG. 1, which is a block diagram of an embodiment of a signal detecting system of a multiple input/output antenna system according to the present invention.

The present invention provides a signal detection system for a multiple input/output antenna system, comprising: a channel estimation module 11, an IRC detection module 12, a division module 13 and a demodulation module 14. The channel estimation module 11, the IRC detection module 12, the division module 13 and the demodulation module 14 are sequentially connected, and may be connected by wire, or may be connected by wireless, or may be connected by wire and wireless. .

The channel estimation module 11 is configured to perform channel estimation on the received signal, obtain a result of the channel estimation, and transmit the result to the IRC detection module 12.

The IRC detecting module 12 is configured to detect the received signal according to the result of the signal estimation, obtain a numerator and a denominator of the estimated signal, and a numerator and a denominator of the corresponding signal to noise ratio, And transmitted to the division module 13.

The dividing module 13 is configured to obtain the estimated signal and the signal-to-noise ratio using the fast division of the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal-to-noise ratio, and transmit the same to the demodulation module 14.

The demodulation module 14 is configured to demodulate the estimated signal and the signal to noise ratio to obtain a likelihood distance of each bit as a soft information output.

In order to describe in detail the implementation mechanism of the signal detecting system of the above-described multi-input and output antenna system, please refer to FIG. 2, which is a schematic flowchart of an embodiment of a signal detecting method of the multi-input and output antenna system of the present invention.

Corresponding to a signal detection system for a multiple input and output antenna system, the present invention also provides a signal detection method for a multiple input and output antenna system, which includes the following steps:

Step S1: performing channel estimation based on the received signal to obtain a channel estimation result. In the step S1, the channel estimation module 11 estimates the channel response and the noise floor of the carrier by using some a priori information, for example, estimating the channel response by using the pilot. , using a null carrier to estimate the noise floor, called channel estimation.

Step S2: detecting, according to the result of the signal estimation, the received signal by using an IRC detection method to obtain a numerator and a denominator of the estimated signal, and a numerator and a denominator of the corresponding signal to noise ratio;

The mathematical model of MIMO can be described as follows:

〔1〕

For the following discussion, it’s easy to make

〔2〕

Under the above mark, the formula [1] becomes

r = + h ₂ s ₂ + n [ 3 ] where n denotes a noise vector whose variance is σ ² ; sl, s2 denotes a transmitted signal vector; r denotes a received signal vector; hl, h2 denote a channel transmission characteristic matrix.

When estimating one of the data streams, consider another data stream as interference. For example, si is the transmitted signal vector and s2 is the interference. After the interference plus white noise, the interference + noise is not white, so the so-called IRC can be used. merge. For MS (mobile station) 1, you can get: r - s _x + n

n - h ₂ s ₂ + n

[4]

So the covariance matrix of noise + interference is:

∑丄 = σ ² Ι + h ₂ h ₂ ^H 〔5〕

Where σ ² represents the noise power of the system.

Under the above token, using the IRC receiver, the merge of MS1 is:

s ~ _v = Wr = (σ ² Ι + h ₂ h ₂ ^H )- ¹ r

[6]

Similarly, the IRC merge that can be obtained for MS2 is:

[7]

s ₂ = h ₂ ^H ∑ ₂ ~ ^l r = h ₂ ^H (σ ² Ι + h ^H ) ^_1 r At the same time, the SINR (Signal to Interference plus Noise Ratio) of the two MSs can be obtained as follows

SINR, = h " (σ ² Ι + h ₂ h ₂ ^H ) ^-1

〔9〕

SINR ₂ = h ₂ ^H (σ ² Ι + h " ) - ¹ h ₂

[10]

Normally, after the IRC is merged, it is necessary to demodulate the data streams of the two MSs and adjust the LLR obtained by the demodulation (that is, the likelihood distance of each bit). The process of demodulation is to send the following equation to the demodulator:

s ~ SINR _k

The resulting soft symbol is multiplied by the SLRk to obtain the kLR of the kth MS. In fact, the division operation is avoided by enlarging the star map.

In the embodiment of the present invention, the matrices ∑1 and ∑2 in the equations [5] and [7] are both matrices, for example, in the case of four receiving antennas, the two matrices are all 4x4 matrices. The inversion of such a matrix is complicated, but the structure of equations [5] and [7] can simplify the operation of matrix inversion. Inverse lemma according to the matrix [ Matrix Inverse Lemma]

( ^{A + UV} ) = ^A H _Δ -1

1 + v A u

[11]

Can get:

A - i = ( ² ,f) ^X - ₂ ^ _{= 1} ,2

σ σ ² +\\ Κ \\ ² )

[12]

Equation [12], that is, the IRC detecting module 12 detects the received signal based on the result of the signal estimation, the denominator of the obtained estimated signal, and the denominator of the corresponding signal-to-noise ratio.

In addition, you can also get:

[13]

SINR,

σ σ ² +\\ \\ ² )

Face_(a ² +\\h _l \\ ² )xh ₂ ^H h ₂ -h ₂ ^H h _l xh _l ^H h ₂

σ σ ² +\\Κΐ)

[14]

The numerator and denominator of the estimated signal, and the corresponding signal-to-noise ratio numerator and denominator are as follows:

SINR, _ Mo/ = (σ ² + 11 /3⁄4 11 ² ) x Α Α "h"h ₂ xh"

SINR ₂ _Mol = (a ² +\\h _l \\ ² )xh ₂ ^H h ₂ -h ₂ ^H h _l xh"h ₂

S, ― Den = SINR, ― Den = σ ² (σ ² + 1| h ₂ 1| ² )

Step S3, using fast division according to the numerator and denominator of the estimated signal, and the corresponding signal to noise ratio of the molecular and denominator to obtain an estimated signal and a signal to noise ratio;

Please refer to FIG. 3 , which is a schematic diagram of the module of the dividing module 13 shown in FIG. 1 .

The dividing module 13 includes a first divider 131 and a second divider 132.

a first divider 131, configured to perform fast division on the numerator and denominator of the estimated signal to obtain an estimated signal;

A second divider 132 is configured to obtain a signal to noise ratio using fast division for the numerator and denominator of the signal to noise ratio.

Here's how the fast division works:

Order

1 9 ²⁴

A = B /C = Bx— = Bx—x2~ ²⁴ [15]

CC A, B, C are 32-bit signed real numbers

D 〔16〕

C

The following uses the table lookup and shift method to calculate D

First, find the number of sign bits of C, which is represented by &a/eC:

ScaleC - norm{C) [17] The left shift &a/eC-l bit of C is decremented by 1 to preserve the most significant sign bit.

C l8 At this time, S must be the highest bit as the sign bit, the second bit is the valid bit, and the second bit is definitely 1.

Take the 9-bit valid bit of S, and its most significant bit is 1, then the value range of S: OxlOO-Oxlffo So you can make a table as follows:

DivTable[i] = = 0~0x7/

[ ₁₉ ] Since S is a 32-bit number (the effective bit is 31 bits), only the upper 9 valid bits are taken now, so it is equivalent to amplifying the division result by 2 ²² times. Ζ) ή 73⁄4/φ·] ranges from 2 ^{14 to} 2 ¹⁵ . In addition, this table calculates the absolute value of S, without considering its sign. At this point, |D| can be obtained as follows:

|Z)| = DivTable[S ₃ _ ₉ ] x 2 ^{22+ScaleC 1} 〔 20〕

₉ means taking the 3rd to 9th bits of S, and its value range is 0x00~0xff. When you are ^, ^ can be said to:

-twenty four

^4 = ±3χ Ζ) χ2

= ±BxDivTcMe[i]x2 i - S 3-9 [21] In order to be represented by 32 bits without overflow, the appropriate shift to S is also made:

Let the sign bit of S be: ScakB, then B, = Bx 2 ^ScaleB - ¹ - ¹⁶ [22] At this time, -2 ¹⁵ ≤ S '< 2 ¹⁵ , can be expressed as follows:

A = ±B x DivTable_i]x2- ^47+ScaleC - ¹

= ±B *x DivTable[i] x ₂ - ^47+ScaleC - ^l - ^ScaleB+l+l6 i = S ₃ _ ₉ [ ₂₃ ] Finally, multiply the above result by the sign of C.

From equation [23], ^ consists of two parts, the valid data part and the Scale value part, where the valid data part is: B 'x DivTab i is represented by a 31-bit symbol number, and the Scale value part: - 47 + &a/ eC - 1 - &a/eS + l + 16.

Please refer to FIG. 4, which is a block diagram of the first divider 131 shown in FIG.

The first divider 131 includes: a first symbol generating unit 1311, a first index generating unit 1312, a first shift generating unit 1313, a first effective value and sign bit generating unit 1314, and a first restoring unit 1315.

a first symbol generating unit 1311, configured to extract a numerator and a denominator of the estimated signal, and calculate a symbol of the estimated signal;

The first index generating unit 1312 is configured to establish a lookup table of the estimated signal according to the denominator of the estimated signal, and calculate a sign bit of the absolute value of the denominator of the estimated signal according to the denominator of the estimated signal, and perform shifting to obtain an absolute value of the denominator of the estimated signal. a shift value of the sign bit of the value, and extracting a high 8Bit of the shift value of the sign bit of the absolute value of the denominator of the estimated signal as a denominator search index of the estimated signal;

The first shift generating unit 1313 is configured to calculate a sign bit of the absolute value of the molecular value of the estimated signal according to the numerator of the estimated signal, and perform shifting to obtain a shift value of the sign bit of the molecular absolute value of the estimated signal;

The first effective value and sign bit generating unit 1314 is configured to obtain an effective value of the estimated signal and a denominator according to the estimated signal according to the lookup table of the estimated signal and the lookup index, and the shift value of the sign bit of the molecular absolute value of the estimated signal. The sign bit of the absolute value and the sign bit of the molecular absolute value of the estimated signal result in a total sign bit; The first restoring unit 1315 is configured to obtain an estimated signal according to the effective value of the estimated signal and the total sign bit, and the sign of the estimated signal.

Similarly, the second divider 132 includes: a second symbol generating unit, a second index generating unit, a second shift generating unit, a second effective value and sign bit generating unit, and a second restoring unit. The second symbol generating unit, the second index generating unit, the second shift generating unit, the second effective value and the structure and function of the sign bit generating unit and the second restoring unit respectively correspond to the first symbol generating unit 1311, An index generating unit 1312, a first shift generating unit 1313, a first effective value and sign bit generating unit 1314, and a first restoring unit 1315.

Step S4: Demodulate the likelihood distance of each bit based on the estimated signal and the signal to noise ratio as a soft information output.

In the above step S4, the demodulation method employed may be any demodulation algorithm.

The embodiment adopted by the present invention uses the IRC linear detection algorithm to apply to a MIMO system with only two data streams and a relatively large number of antennas, and realizes spatial multiplexing of the MIMO signal to complete the MIMO detection task. It will be appreciated that the invention is also applicable to the case of one or more data streams.

Compared with the prior art, the beneficial effects of the present invention are: In the signal detection process, the principle of IRC linear detection is appropriately simplified, the operation of matrix inversion is avoided, the complexity of the algorithm is reduced, and the operation is improved. Efficiency, in addition, the invention also adopts fast division, further improves the efficiency of signal detection, ensures real-time processing of the MIMO detection function, and improves the processing capability of the system.

The present invention is suitable for a MIMO system with a large number of receiving antennas.

The above description shows and describes a preferred embodiment of the present invention, but as described above, it should be understood that the present invention is not limited to the forms disclosed herein, and should not be construed as Other combinations, modifications, and environments are possible and can be modified by the teachings or related art or knowledge within the scope of the inventive concept described herein. Changes and modifications made by those skilled in the art should be made without departing from the spirit and scope of the invention. Within the required scope of protection

Claims

Claim

A signal detection method for a multiple input/output antenna system, comprising: performing channel estimation based on the received signal to obtain a channel estimation result;

Based on the result of the signal estimation, the received signal is detected using an interference suppression combined IRC detection method to obtain the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal to noise ratio;

2. The signal detecting method of a multiple input/output antenna system according to claim 1, wherein the method further comprises:

Based on the estimated signal and the signal to noise ratio, the likelihood distance of each bit is demodulated as a soft information output.

The signal detecting method of the MIMO antenna system according to claim 1, wherein the step of using the fast division according to the numerator and the denominator of the estimated signal to obtain an estimated signal further comprises:

Extracting the numerator and denominator of the estimated signal, and calculating the sign of the estimated signal;

Establishing a lookup table of estimated signals based on the denominator of the estimated signal;

Calculating the sign bit of the absolute value of the denominator of the estimated signal according to the denominator of the estimated signal, and shifting, obtaining the shift value of the sign bit of the absolute value of the denominator of the estimated signal, and extracting the shift of the sign bit of the absolute value of the denominator of the estimated signal The high 8Bit of the bit value is used as the denominator search index of the estimated signal;

Obtaining an effective value of the estimated signal according to a lookup table of the estimated signal and a lookup index, and a shift value of the sign bit of the estimated molecular absolute value of the signal; Obtaining a total sign bit according to the sign bit of the absolute value of the denominator of the estimated signal and the sign bit of the molecular absolute value of the estimated signal;

The signal detecting method of the multiple input/output antenna system according to claim 1, wherein the numerator and the denominator based on the corresponding signal to noise ratio use a fast division method to obtain a signal to noise ratio step, and further Includes:

The signal-to-noise ratio is obtained from the effective value of the signal-to-noise ratio and the total sign bit, and the sign of the signal-to-noise ratio.

The signal detecting method of the MIMO antenna system according to claim 1, wherein the step of performing channel estimation based on the received signal to obtain a result of the channel estimation further comprises:

A signal detection system for a multiple input/output antenna system, comprising: a channel estimation module, configured to perform channel estimation on the received signal to obtain a channel estimation Result

An IRC detecting module, configured to detect, according to a result of the signal estimation, a received signal, obtain a numerator and a denominator of the estimated signal, and a numerator and a denominator of a corresponding signal to noise ratio;

A division module for using the numerator and denominator of the estimated signal, and the numerator and denominator of the corresponding signal-to-noise ratio, using fast division to obtain an estimated signal and a signal to noise ratio.

7. The signal detecting system of a multiple input/output antenna system according to claim 6, wherein the method further comprises:

And a demodulation module, configured to demodulate the estimated signal and the signal to noise ratio to obtain a likelihood distance of each bit as a soft information output.

8. The signal detection system of a multiple input/output antenna system according to claim 7, wherein the dividing module comprises:

9. The signal detecting system of a multiple input/output antenna system according to claim 8, wherein the first divider comprises:

a first index generating unit, configured to: according to a denominator of the estimated signal, establish a lookup table of the estimated signal and calculate a sign bit of the absolute value of the denominator of the estimated signal according to a denominator of the estimated signal, and perform shifting to obtain an absolute value of the denominator of the estimated signal The shift value of the sign bit, and extract the high 8Bit of the shift value of the sign bit of the absolute value of the denominator of the estimated signal as the denominator search index of the estimated signal; a first shift generating unit, configured to calculate a sign bit of the molecular absolute value of the estimated signal according to the numerator of the estimated signal, and perform shifting to obtain a shift value of the sign bit of the molecular absolute value of the estimated signal;

10. The signal detecting system of a multiple input/output antenna system according to claim 8, wherein the second divider comprises:

a second index generating unit, configured to establish a signal to noise ratio lookup table according to a denominator of the signal to noise ratio, and calculate a sign bit of the absolute value of the denominator of the signal to noise ratio according to a denominator of the signal to noise ratio, and perform shifting to obtain a signal noise The shift value of the sign bit of the absolute value of the denominator, and extract the high 8Bit of the shift value of the sign bit of the absolute value of the denominator of the signal to noise ratio as the denominator search index of the signal to noise ratio;

a second shift generating unit, configured to calculate a sign bit of a molecular absolute value of the signal-to-noise ratio according to a SNR molecule, and perform shifting to obtain a shift value of a sign bit of a molecular absolute value of the signal-to-noise ratio; a second effective value and sign bit generating unit, configured to obtain a signal-to-noise ratio effective value and a signal-to-noise ratio according to a signal to noise ratio lookup table and a lookup index, and a shift value of a sign bit of a molecular absolute value of the signal to noise ratio The sign bit of the absolute value of the denominator and the sign bit of the molecular absolute value of the signal to noise ratio obtain the total sign bit;