CN102820956B - Method and system for detecting signals of multiple input multiple output antenna system - Google Patents
Method and system for detecting signals of multiple input multiple output antenna system Download PDFInfo
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- CN102820956B CN102820956B CN201110154278.0A CN201110154278A CN102820956B CN 102820956 B CN102820956 B CN 102820956B CN 201110154278 A CN201110154278 A CN 201110154278A CN 102820956 B CN102820956 B CN 102820956B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
Abstract
The invention discloses a method for detecting signals of a multiple input multiple output antenna system. The method includes performing channel estimation to a received signal to obtain a result of channel estimation; using an infrared remote control (IRC) detection method to detect the received signal according to the result of the channel estimation so as to obtain a numerator and a denominator of the estimated signal and a numerator and a denominator of a corresponding signal to noise ratio; and performing fast division to the numerator and the denominator of the estimated signal and the numerator and the denominator of the corresponding signal to noise ratio to obtain the estimated signal and the signal to noise ratio. The invention further discloses a system for detecting the signals of the multiple input multiple output antenna system. The method and the system are high in calculation efficiency and capable of guaranteeing real-time processing of a detection function of the multiple input multiple output antenna system and improving processing capacities of the system.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly to a kind of multi-input multi-output antenna system (Multiple-
Input Multiple-Out-put, abbreviation MIMO) signal detecting method and system.
Background technology
In global microwave access intercommunication technology (Worldwide Interoperability for Microwave
Access, abbreviation WIMAX), the Next-Generation Wireless Communication Systems such as Long Term Evolution (Long Term Evolution, abbreviation LTE)
In, more spectrum efficiency is improved using MIMO.Wherein described MIMO technology, is referred to and is received using many transmitting antennas and Duo Gen
Antenna carries out the technology of transmission of wireless signals, and compared with single-antenna technology, MIMO is not increasing system bandwidth and transmission power
In the case of, significantly improve the availability of frequency spectrum of system.
At present, in mimo systems, mainly there are two kinds of signal detecting methods：(1) maximum likelihood (Maximum
Likelihood, abbreviation ML) detection method or simplification ML detection methods, and (2) linearity test method.
Wherein, the principle of ML detection algorithms is exhaustive each possible constellation vector according to constellation set, and according to letter
The estimation of road response, signal reconstruction is carried out to it, calculates reconstruction signal with receiving the distance between signal, selects to cause reconstruct letter
Number with receiving the minimum constellation vector of the distance between signal as the estimation of original signal.The method performance is optimal, but complicated
Degree is linearly increasing with the number of transmitting antenna and constellation point, and the cost realized under multiaerial system and high order system is too high,
Even it is difficult to.Its method for simplifying is exactly that the scope of exhaustive search is reduced by certain means.
Linear detection algorithm includes zero forcing algorithm and least mean-square error (Minimum Mean SquareError, abbreviation
MMSE) algorithm, although linear detection algorithm performance be not so good as ML algorithms, send out complexity not with constellation point number increase
And increase.And, in multi-antenna systems, the performance of MMSE algorithms closely ML algorithms, but complexity is much lower.Cause
This, is a rational scheme using MMSE detection methods in multi-antenna systems.But, even so, using linear inspection
Method of determining and calculating docking is collected mail and number is processed, and still has that algorithm complex is high, and operation efficiency is low, and system processing load is asked again etc.
Topic.
The content of the invention
The technical problem to be solved is：Processed using the docking collection of letters number of existing signal detecting method,
There is algorithm complex high, operation efficiency is low, system processing load weight, or even the problem being difficult to.
To solve above-mentioned technical problem, the present invention is adopted the following technical scheme that：
The present invention provides a kind of signal detecting method of multi-input multi-output antenna system, and it includes：
Channel estimation is carried out based on the signal for receiving, the result of channel estimation is obtained；
Based on the result of the Signal estimation, using AF panel (Interference Rejection are merged
Combining, abbreviation IRC) detection method detects to the signal for receiving, to obtain the molecule and denominator of estimating signal,
And the molecule and denominator of corresponding signal to noise ratio；
Molecule and denominator based on the estimation signal, and the molecule and denominator of corresponding signal to noise ratio, using quick
Division, to obtain signal and signal to noise ratio are estimated.
Further, a kind of signal detecting method of above-mentioned multi-input multi-output antenna system, also includes：
Based on the estimation signal and signal to noise ratio, demodulation obtains the likelihood distance of each bit, used as Soft Inform ation output.
Further, the molecule and denominator based on the estimation signal, using fast division, to obtain estimation signal
The step of, including：
The molecule and denominator for estimating signal is extracted, the symbol for estimating signal is calculated；According to the denominator for estimating signal, build
The vertical look-up table for estimating signal；
According to the denominator for estimating signal, the sign bit of the denominator absolute value for estimating signal is calculated, and shifted, estimated
The displacement numerical value of the sign bit of the denominator absolute value of meter signal, and extract the displacement of the sign bit of the denominator absolute value for estimating signal
The high 8Bit of numerical value searches index as the denominator for estimating signal；
According to the molecule for estimating signal, the sign bit of the molecule absolute value for estimating signal is calculated, and shifted, estimated
The displacement numerical value of the sign bit of the molecule absolute value of meter signal；
Look-up table and lookup according to signal is estimated is indexed, and estimates the shifting of the sign bit of the molecule absolute value of signal
Bit value, obtains estimating the virtual value of signal；
Obtained always according to the sign bit of the molecule absolute value of the sign bit and estimation signal of the denominator absolute value for estimating signal
Sign bit；
According to estimate signal virtual value and total sign bit, and estimate signal symbol, obtain estimate signal.
Further, the molecule and denominator based on corresponding signal to noise ratio, using fast division, to obtain signal to noise ratio
The step of, including：
The molecule and denominator of signal to noise ratio are extracted, the symbol of signal to noise ratio is calculated；
According to the denominator of signal to noise ratio, the look-up table of signal to noise ratio is set up；
According to the denominator of signal to noise ratio, the sign bit of the denominator absolute value of signal to noise ratio is calculated, and shifted, obtain signal to noise ratio
Denominator absolute value sign bit displacement numerical value, and extract the denominator absolute value of signal to noise ratio sign bit displacement numerical value height
8Bit searches index as the denominator of signal to noise ratio；
According to the molecule of signal to noise ratio, the sign bit of the molecule absolute value of signal to noise ratio is calculated, and shifted, obtain signal to noise ratio
Molecule absolute value sign bit displacement numerical value；
According to the look-up table of signal to noise ratio and index is searched, and the carry digit of the sign bit of the molecule absolute value of signal to noise ratio
Value, obtains the virtual value of signal to noise ratio；
Total symbol is obtained according to the sign bit of the molecule absolute value of the sign bit and signal to noise ratio of the denominator absolute value of signal to noise ratio
Number position；
According to the virtual value and total sign bit of signal to noise ratio, and the symbol of signal to noise ratio, obtain signal to noise ratio.
Further, it is described that channel estimation is carried out based on the signal for receiving, the step of obtain the result of channel estimation, bag
Include：
Estimate channel response using pilot tone, made an uproar using empty carrier estimation bottom.
The present invention also provides a kind of signal detection system of multi-input multi-output antenna system, and it includes：
Channel estimation module, for carrying out channel estimation to the signal for receiving, obtains the result of channel estimation；IRC is examined
Survey module, for according to the result of the Signal estimation, the signal to receiving to be detected, obtain estimate signal molecule and
Denominator, and the molecule and denominator of corresponding signal to noise ratio；And dividing module, for it is described estimation signal molecule and point
Mother, and the molecule and denominator of corresponding signal to noise ratio, using fast division, obtain and estimate signal and signal to noise ratio.
Further, a kind of signal detection system of above-mentioned multi-input multi-output antenna system also includes：
Demodulation module, for the estimation signal and signal to noise ratio, demodulation to obtain the likelihood distance of each bit, used as soft
Information output.
Further, the dividing module includes：
First divider, for molecule and denominator to the estimation signal, using fast division, obtains and estimates signal；
And
Second divider, for molecule and denominator to the signal to noise ratio, using fast division, obtains signal to noise ratio.
Further, the first divider includes：
First symbol signal generating unit, for extracting the molecule and denominator of estimating signal, is calculated the symbol for estimating signal；
First index signal generating unit, for according to estimate signal denominator, set up estimate signal look-up table and according to
Estimate the denominator of signal, calculate the sign bit of the denominator absolute value for estimating signal, and shifted, obtain estimating the denominator of signal
The displacement numerical value of the sign bit of absolute value, and extract the high 8Bit of the displacement numerical value of the sign bit of the denominator absolute value for estimating signal
Index is searched as the denominator for estimating signal；
First displacement signal generating unit, for according to the molecule for estimating signal, calculating the symbol of the molecule absolute value for estimating signal
Number position, and shifted, obtain the displacement numerical value of the sign bit of the molecule absolute value for estimating signal；
First virtual value and sign bit signal generating unit, for being indexed according to the look-up table and lookup of estimating signal, and
Estimate the displacement numerical value of the sign bit of the molecule absolute value of signal, obtain estimating the virtual value of signal and dividing according to estimation signal
The sign bit of the sign bit of female absolute value and the molecule absolute value of estimation signal obtains total sign bit；And
First reduction unit, for according to estimate signal virtual value and total sign bit, and estimate signal symbol,
Obtain estimating signal.
Further, the second divider includes：
Second symbol signal generating unit, for extracting the molecule and denominator of signal to noise ratio, is calculated the symbol of signal to noise ratio；
Second index signal generating unit, for according to the denominator of signal to noise ratio, set up signal to noise ratio look-up table and and according to
The denominator of signal to noise ratio, calculates the sign bit of the denominator absolute value of signal to noise ratio, and is shifted, and obtains the denominator absolute value of signal to noise ratio
Sign bit displacement numerical value, and extract the denominator absolute value of signal to noise ratio sign bit displacement numerical value high 8Bit as estimation
The denominator of signal searches index；
Second displacement signal generating unit, for according to the molecule of signal to noise ratio, calculating the sign bit of the molecule absolute value of signal to noise ratio,
And shifted, obtain the displacement numerical value of the sign bit of the molecule absolute value of signal to noise ratio；
Second virtual value and sign bit signal generating unit, for according to the look-up table of signal to noise ratio and lookup index, Yi Jixin
Make an uproar than molecule absolute value sign bit displacement numerical value, obtain signal to noise ratio virtual value and according to estimate signal denominator it is absolute
The sign bit of the sign bit of value and the molecule absolute value of estimation signal obtains total sign bit；And
Second reduction unit, for according to the virtual value of signal to noise ratio and total sign bit, and the symbol of signal to noise ratio, obtain
Signal to noise ratio.
The beneficial effects of the present invention is：In signal detection process, appropriate letter is done to the principle of IRC linearity tests
Change, it is to avoid the computing of matrix inversion, reduce the complexity of algorithm, improve operation efficiency, in addition the present invention is also using fast
Fast division, further improves the efficiency of signal detection, it is ensured that MIMO detects the real-time processing of function, improves the process energy of system
Power.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of embodiment module diagram of the signal detection system of multi-input multi-output antenna system of the invention.
Fig. 2 is a kind of embodiment schematic flow sheet of the signal detecting method of multi-input multi-output antenna system of the invention.
Fig. 3 is the module diagram of dividing module 13 shown in Fig. 1.
Fig. 4 is the module diagram of the first divider 131 shown in Fig. 3.
Specific embodiment
In order that the technical problem to be solved, technical scheme and beneficial effect are clearer, clear, below tie
Drawings and Examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Fig. 1 is referred to, it is a kind of embodiment module of the signal detection system of multi-input multi-output antenna system of the invention
Schematic diagram.
The present invention provides a kind of signal detection system of multi-input multi-output antenna system, and it includes：Channel estimation module 11,
IRC detection modules 12, dividing module 13 and demodulation module 14.Channel estimation module 11, IRC detection modules 12, dividing module 13
It is sequentially connected with demodulation module 14, and can be attached by wired form, it is also possible to is connected by wireless form
Connect, it is also possible to be attached by the way of wired and wireless.
Channel estimation module 11, for carrying out channel estimation to the signal for receiving, obtains the result of channel estimation, and passes
It is defeated by IRC detection modules 12.
IRC detection modules 12, for according to the result of the Signal estimation, the signal to receiving to be detected, obtain
Estimate the molecule and denominator of signal, and the molecule and denominator of corresponding signal to noise ratio, and be transferred to dividing module 13.
Dividing module 13, for it is described estimation signal molecule and denominator, and the molecule of corresponding signal to noise ratio and
Denominator, using fast division, obtains and estimates signal and signal to noise ratio, and is transferred to demodulation module 14.
Demodulation module 14, for the estimation signal and signal to noise ratio, demodulation to obtain the likelihood distance of each bit, as
Soft Inform ation is exported.
In order to describe a kind of realization mechanism of the signal detection system of above-mentioned multi-input multi-output antenna system in detail, please in the lump
With reference to Fig. 2, it is a kind of embodiment schematic flow sheet of the signal detecting method of multi-input multi-output antenna system of the invention.
Corresponding to a kind of signal detection system of multi-input multi-output antenna system, the present invention also provides a kind of Multiinputoutput
The signal detecting method of antenna system, it comprises the steps：
Step S1, channel estimation is carried out based on the signal for receiving, obtain the result of channel estimation；
In step S1, channel estimation module 11 estimates channel response and the bottom of the carrier wave using some prior informations
Make an uproar, such as patterns available estimates channel response, is made an uproar with empty carrier estimation bottom, referred to as channel estimation.
Step S2, the result based on the Signal estimation, are detected using IRC detection methods to the signal for receiving,
To obtain the molecule and denominator of estimating signal, and the molecule and denominator of corresponding signal to noise ratio：
The Mathematical Modeling of MIMO can be described below：
〔1〕
Simple, the Bu Fangling in order to be discussed below
〔2〕
Under above-mentioned mark, formula (1) becomes
R=h1s1+h2s2+n 〔3〕
Wherein, n represents noise vector, and its variance is σ2；S1, s2 represent transmission signal vector；R represent reception signal to
Amount；H1, h2 represent channel transfer characteristic matrix.
When estimating wherein 1 data flow, other 1 data flow is considered as interference, such as s1 is transmission signal vector,
S2 is interference, then plus after white noise, interference+noise is not just white, therefore can be merged using so-called IRC for interference.
For MS1, can obtain：
R=h1s1+n′
N '=h2s2+n 〔4〕
So the covariance matrix of noise+interference is：
∑1=σ2I+h2h2 H 〔5〕
Wherein, σ2The noise power of expression system.
Under above-mentioned mark, using IRC receivers, obtaining the merging of MS1 is：
〔6〕
In the same manner, can obtain the IRC merging of MS2 is：
∑2=σ2I+h1h1 H 〔7〕
〔8〕
Meanwhile, the SINR that can obtain two MS is as follows
SINR1=h1 H(σ2I+h2h2 H)-1h1 〔9〕
SINR2=h2 H(σ2I+h1h1 H)-1h2 〔10〕
Under normal circumstances, after IRC merges, in addition it is also necessary to the LLR for demodulating to the data flow of two MS and obtaining to demodulation
It is adjusted.The process of demodulation is that following formula is sent into demodulator：
The soft symbol for obtaining takes advantage of again the LLR that k-th MS is obtained in SINRk.Actually by amplify planisphere method so as to
Avoid division arithmetic.
In an embodiment of the present invention, the matrix ∑ 1 and ∑ 2 in formula (5) and (7) is all NRx*NRxMatrix, such as
The two matrixes are all the matrixes of 4x4 in the case of four reception antennas.The inversion operation of this matrix is more complicated, but sharp
The computing that can be inverted with simplification matrix with the structure of formula (5) and (7).According to matrix inversion lemma (Matrix Inverse
Lemma〕
〔11〕
Can obtain：
〔12〕
Formula (12), namely IRC detection modules 12, according to the result of the Signal estimation, the signal to receiving is examined
Survey, the denominator of the estimation signal of acquisition, and the denominator of corresponding signal to noise ratio.
Alternatively, it is also possible to obtain：
〔13〕
〔14〕
Estimate the molecule and denominator of signal, and the molecule and denominator of corresponding signal to noise ratio be as described below：
S1_ Mol=(σ2+||h2||2)×h1 Hr-h1 Hh2×h2 Hr
S2_ Mol=(σ2+||h1||2)×h2 Hr-h2 Hh1×h1 Hr
SINR1_ Mol=(σ2+||h2||2)×h1 Hh1-h1 Hh2×h2 Hh1
SINR2_ Mol=(σ2+||h1||2)×h2 Hh2-h2 Hh1×h1 Hh2
S1_ Den=SINR1_ Den=σ2(σ2+||h2||2)
S2_ Den=SINR2_ Den=σ2(σ2+||h1||2)
Step S3, the molecule based on the estimation signal and denominator, and the molecule and denominator of corresponding signal to noise ratio, make
With fast division, to obtain signal and signal to noise ratio are estimated；
Fig. 3 is referred to, it is the module diagram of dividing module 13 shown in Fig. 1.
The dividing module 13 includes the first divider 131 and the second divider 132.
First divider 131, for molecule and denominator to the estimation signal, using fast division, obtains and estimates letter
Number；
Second divider 132, for molecule and denominator to the signal to noise ratio, using fast division, obtains signal to noise ratio.
The principle of fast division is described below：
Order
〔15〕
A, B, C are 32 a symbol real number.
Order
〔16〕
D is calculated below with the method tabled look-up and shift
First, the number of the sign bit of C is obtained, is represented with ScaleC：
ScaleC=norm (C) (17)
ScaleC-1 positions are moved to left to C, why subtracts 1, be to retain highest order sign bit.
S=C × 2ScaleC-1 〔18〕
Now, necessarily a highest order is sign bit to S, and second is later significance bit, and second is 1 certainly.
9 significance bits of S are taken, but its highest significant position is 1, then the span of S：0x100～0x1ff.Therefore I
Can as follows make a table：
〔19〕
Because S is the number (significance bit is 31) of 32, his high 9 significance bits have only been taken now, so quite
In result of division is exaggerated into 222Times.The span of DivTable [i]：214～215.What in addition this meter was calculated is the absolute of S
Value, does not account for its symbol.Now, | D | can be asked with the following method：
| D |=DivTable [S3-9]×2-22+ScaleC-1 〔20〕
S3-9Expression takes the 3rd to the 9th of S, its span：0x00～0xff.
Now, A can be expressed as below：
A=± B × | D | × 2-24
=± B × DivTable [i] × 2-46+ScaleC-1I=S3-9 〔21〕
In order that A by 32 expressions, and can not spill over, appropriate displacement to also be done to B：
The sign bit for making B is：ScaleB, then
B '=B × 2ScaleB-1-16 〔22〕
Now, -215≤ B ' ＜ 215, A can be expressed as below：
A=± B × DivTable [i] × 2-47+ScaleC-1
=± B ' × DivTable [i] × 2-47+ScaleC-1-ScaleB+1+16I=S3-9 〔23〕
Finally, in the symbol that result above is multiplied by C.
From formula (23), A is made up of two parts, valid data part and Scale value parts, wherein valid data portion
It is divided into：B ' × DivTable [i], is represented, Scale value parts by the symbolic number of 31：-46+ScaleC-1-ScaleB+1
+16。
Fig. 4 is referred to, it is the module diagram of the first divider 131 shown in Fig. 3.
First divider 131 includes：First symbol signal generating unit 1311, the first index signal generating unit 1312, the first displacement
Signal generating unit 1313, the first virtual value and the reduction unit 1315 of sign bit signal generating unit 1314 and first.
First symbol signal generating unit 1311, for extracting the molecule and denominator of estimating signal, is calculated and estimates signal
Symbol；
First index signal generating unit 1312, for according to estimate signal denominator, set up estimate signal look-up table and
According to the denominator for estimating signal, the sign bit of the denominator absolute value for estimating signal is calculated, and shifted, obtain estimating signal
The displacement numerical value of the sign bit of denominator absolute value, and extract the height of the displacement numerical value of the sign bit of the denominator absolute value for estimating signal
8Bit searches index as the denominator for estimating signal；
First displacement signal generating unit 1313, for according to the molecule for estimating signal, calculating the molecule absolute value for estimating signal
Sign bit, and shifted, obtain the displacement numerical value of the sign bit of the molecule absolute value for estimating signal；
First virtual value and sign bit signal generating unit 1314, for being indexed according to the look-up table and lookup of estimating signal,
And the displacement numerical value of the sign bit of the molecule absolute value of estimation signal, obtain estimating the virtual value of signal and according to estimation signal
Denominator absolute value sign bit and estimate that the sign bit of molecule absolute value of signal obtains total sign bit；
First reduction unit 1315, for according to estimating the virtual value and total sign bit of signal, and estimates signal
Symbol, obtains estimating signal.
In the same manner, the second divider 132 includes：Second symbol signal generating unit, the second index signal generating unit, the second displacement is generated
Unit, the second virtual value and sign bit signal generating unit and the second reduction unit.Second symbol signal generating unit, the second index generates single
The 26S Proteasome Structure and Function of unit, the second displacement signal generating unit, the second virtual value and sign bit signal generating unit and the second reduction unit, respectively
Correspondingly similar to the first symbol signal generating unit 1311, the first index signal generating unit 1312, the first displacement signal generating unit 1313, first
Virtual value and the reduction unit 1315 of sign bit signal generating unit 1314 and first.
Step S4, based on the estimation signal and signal to noise ratio, demodulation obtains the likelihood distance of each bit, used as Soft Inform ation
Output.
In above-mentioned steps S4, the demodulation method for adopting can be any demodulating algorithm.
Embodiment of the present invention, is to be applied to only 2 data flows using IRC linear detection algorithms, and
The more mimo systems of antenna amount, realize the solution space multiplexing of MIMO signal, complete MIMO Detection tasks.Understandably
It is that the present invention could be applicable to the situation of 1 or multiple data flows.
Compared to prior art, the invention has the beneficial effects as follows：Original in signal detection process, to IRC linearity tests
Reason has done appropriate simplification, it is to avoid the computing of matrix inversion, reduces the complexity of algorithm, improves operation efficiency, in addition
The present invention also adopts fast division, further improves the efficiency of signal detection, it is ensured that MIMO detects the real-time processing of function, carries
The disposal ability of high system.
The present invention is adapted to apply the more mimo systems of reception antenna.
Described above illustrates and describes a preferred embodiment of the present invention, but as previously mentioned, it should be understood that the present invention
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations,
Modification and environment, and can be in invention contemplated scope described herein, by above-mentioned teaching or the technology or knowledge of association area
It is modified.And change that those skilled in the art are carried out and change be without departing from the spirit and scope of the present invention, then all should be at this
In the protection domain of bright claims.
Claims (10)
1. a kind of signal detecting method of multi-input multi-output antenna system, it is characterised in that include：
Channel estimation is carried out based on the signal for receiving, the result of channel estimation is obtained；
Based on the result of the channel estimation, the signal for receiving is detected using IRC detection methods,
To obtain the molecule and denominator of estimating signal, and the molecule and denominator of corresponding signal to noise ratio；
Molecule and denominator based on the estimation signal, and the molecule and denominator of corresponding signal to noise ratio, using fast division,
Estimate signal and signal to noise ratio to obtain.
2. the signal detecting method of a kind of multi-input multi-output antenna system according to claim 1, it is characterised in that enter
Step includes：
Based on the estimation signal and signal to noise ratio, demodulation obtains the likelihood distance of each bit, used as Soft Inform ation output.
3. the signal detecting method of a kind of multi-input multi-output antenna system according to claim 1, it is characterised in that described
Molecule and denominator based on the estimation signal, using fast division, to obtain the step of estimating signal, further includes：
The molecule and denominator for estimating signal is extracted, the symbol for estimating signal is calculated；
According to the denominator for estimating signal, the look-up table for estimating signal is set up；
According to the denominator for estimating signal, the sign bit of the denominator absolute value for estimating signal is calculated, and shifted, obtain estimating letter
Number denominator absolute value sign bit displacement numerical value, and extract estimate signal denominator absolute value sign bit displacement numerical value
High 8Bit as estimate signal denominator search index；
According to the molecule for estimating signal, the sign bit of the molecule absolute value for estimating signal is calculated, and shifted, obtain estimating letter
Number molecule absolute value sign bit displacement numerical value；
Look-up table and lookup according to signal is estimated is indexed, and estimates the carry digit of the sign bit of the molecule absolute value of signal
Value, obtains estimating the virtual value of signal；
Total symbol is obtained according to the sign bit of the molecule absolute value of the sign bit and estimation signal of the denominator absolute value for estimating signal
Number position；
According to estimate signal virtual value and total sign bit, and estimate signal symbol, obtain estimate signal.
4. the signal detecting method of a kind of multi-input multi-output antenna system according to claim 1, it is characterised in that described
Molecule and denominator based on corresponding signal to noise ratio, using fast division, the step of to obtain signal to noise ratio, further includes：
The molecule and denominator of signal to noise ratio are extracted, the symbol of signal to noise ratio is calculated；
According to the denominator of signal to noise ratio, the look-up table of signal to noise ratio is set up；
According to the denominator of signal to noise ratio, the sign bit of the denominator absolute value of signal to noise ratio is calculated, and shifted, obtain dividing for signal to noise ratio
The displacement numerical value of the sign bit of female absolute value, and extract the high 8Bit of the displacement numerical value of the sign bit of the denominator absolute value of signal to noise ratio
Index is searched as the denominator of signal to noise ratio；
According to the molecule of signal to noise ratio, the sign bit of the molecule absolute value of signal to noise ratio is calculated, and shifted, obtain dividing for signal to noise ratio
The displacement numerical value of the sign bit of sub- absolute value；
According to the look-up table of signal to noise ratio and index is searched, and the displacement numerical value of the sign bit of the molecule absolute value of signal to noise ratio,
Obtain the virtual value of signal to noise ratio；
Total sign bit is obtained according to the sign bit of the molecule absolute value of the sign bit and signal to noise ratio of the denominator absolute value of signal to noise ratio；
According to the virtual value and total sign bit of signal to noise ratio, and the symbol of signal to noise ratio, obtain signal to noise ratio.
5. the signal detecting method of a kind of multi-input multi-output antenna system according to claim 1, it is characterised in that described
Channel estimation is carried out based on the signal for receiving, the step of obtain the result of channel estimation, is further included：
Estimate channel response using pilot tone, made an uproar using empty carrier estimation bottom.
6. a kind of signal detection system of multi-input multi-output antenna system, it is characterised in that include：
Channel estimation module, for carrying out channel estimation to the signal for receiving, obtains the result of channel estimation；
IRC detection modules, for according to the result of the channel estimation, the signal to receiving to be detected,
Obtain the molecule and denominator for estimating signal, and the molecule and denominator of corresponding signal to noise ratio；And
Dividing module, for molecule and denominator, and the molecule and denominator of corresponding signal to noise ratio to the estimation signal, makes
With fast division, obtain and estimate signal and signal to noise ratio.
7. the signal detection system of a kind of multi-input multi-output antenna system according to claim 6, it is characterised in that also wrap
Include：
Demodulation module, for the estimation signal and signal to noise ratio, demodulation to obtain the likelihood distance of each bit, used as Soft Inform ation
Output.
8. the signal detection system of a kind of multi-input multi-output antenna system according to claim 7, it is characterised in that described
Dividing module includes：
First divider, for molecule and denominator to the estimation signal, using fast division, obtains and estimates signal；And
Second divider, for molecule and denominator to the signal to noise ratio, using fast division, obtains signal to noise ratio.
9. the signal detection system of a kind of multi-input multi-output antenna system according to claim 8, it is characterised in that first
Divider includes：
First symbol signal generating unit, for extracting the molecule and denominator of estimating signal, is calculated the symbol for estimating signal；
First index signal generating unit, for according to the denominator for estimating signal, setting up the look-up table of estimation signal and according to estimation
The denominator of signal, calculates the sign bit of the denominator absolute value for estimating signal, and is shifted, and obtains estimating that the denominator of signal is absolute
The displacement numerical value of the sign bit of value, and extract the high 8Bit conducts of the displacement numerical value of the sign bit of the denominator absolute value for estimating signal
The denominator for estimating signal searches index；
First displacement signal generating unit, for according to the molecule for estimating signal, calculating the sign bit of the molecule absolute value for estimating signal,
And shifted, obtain the displacement numerical value of the sign bit of the molecule absolute value for estimating signal；
First virtual value and sign bit signal generating unit, for being indexed according to the look-up table and lookup of estimating signal, and estimate
The displacement numerical value of the sign bit of the molecule absolute value of signal, obtain estimate signal virtual value and according to estimate signal denominator it is exhausted
The sign bit of the molecule absolute value of sign bit and estimation signal to value obtains total sign bit；And
First reduction unit, for according to estimate signal virtual value and total sign bit, and estimate signal symbol, obtain
Estimate signal.
10. the signal detection system of a kind of multi-input multi-output antenna system according to claim 8,
Characterized in that, the second divider includes：
Second symbol signal generating unit, for extracting the molecule and denominator of signal to noise ratio, is calculated the symbol of signal to noise ratio；
Second index signal generating unit, for according to the denominator of signal to noise ratio, setting up the look-up table of signal to noise ratio and according to signal to noise ratio
Denominator, calculates the sign bit of the denominator absolute value of signal to noise ratio, and is shifted, and obtains the sign bit of the denominator absolute value of signal to noise ratio
Displacement numerical value, and extract the denominator absolute value of signal to noise ratio sign bit displacement numerical value high 8Bit as signal to noise ratio denominator
Search index；
Second displacement signal generating unit, for according to the molecule of signal to noise ratio, calculating the sign bit of the molecule absolute value of signal to noise ratio, goes forward side by side
Row displacement, obtains the displacement numerical value of the sign bit of the molecule absolute value of signal to noise ratio；
Second virtual value and sign bit signal generating unit, for being indexed according to the look-up table of signal to noise ratio and lookup,
And the displacement numerical value of the sign bit of the molecule absolute value of signal to noise ratio, obtain the virtual value of signal to noise ratio and according to signal to noise ratio
The sign bit of the sign bit of denominator absolute value and the molecule absolute value of signal to noise ratio obtains total sign bit；And
Second reduction unit, for according to the virtual value of signal to noise ratio and total sign bit, and the symbol of signal to noise ratio, obtain noise
Than.
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