CN105049104B - The matched filtering detection method that 4QAM is modulated in a kind of extensive mimo system - Google Patents
The matched filtering detection method that 4QAM is modulated in a kind of extensive mimo system Download PDFInfo
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- CN105049104B CN105049104B CN201510359043.3A CN201510359043A CN105049104B CN 105049104 B CN105049104 B CN 105049104B CN 201510359043 A CN201510359043 A CN 201510359043A CN 105049104 B CN105049104 B CN 105049104B
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
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Abstract
The invention belongs to signal detection fields, provide the new matched filtering detection method in a kind of extensive mimo system, and this method is the new matched filtering detection algorithm of Interference Cancellation based on threshold areas judgement.Specific method is as follows：Threshold areas judgement is carried out to each symbol detected through MF, to be located at if there are symbols in threshold areas S, calculate the sum of real part and imaginary part absolute value of these symbols, chooses and the detection symbols of value maximum preferentially carries out Interference Cancellation；If being located at without symbol in threshold areas S, the sum of real part and imaginary part absolute value of all symbols are calculated, chooses and the detection symbols of value maximum preferentially carries out Interference Cancellation, until iteration is completed, detect all symbols.The method provided by the present invention to detection symbols by carrying out preliminary thresholding screening, pay the utmost attention to the symbol being located in thresholding, the symbol for choosing the sum of real part and imaginary part absolute value maximum carries out Interference Cancellation, effectively improves the BER performances of system, is particularly suitable for the extensive mimo system based on 4QAM modulation.
Description
Technical field
The invention belongs to the field of signal detection, such as wireless communication, radar, wire communication, more particularly to using big rule
Mould multiple-input and multiple-output (MIMO：Multiple-Input Multiple-Output) communication mode, be specially a kind of big rule
The new matched filtering detection method that 4QAM is modulated in mould MIMO systems.
Background technology
It is well known that by multi-aerial space multiplexing technology, the transmission rate of system can be with antenna number linear increase, day
The increase of line number although system velocity can be improved significantly, also significantly increases the complexity of receiver method.With tool
There is the maximum likelihood (ML of optimal detection performance：Maximum Likelihood) exemplified by detection method, complexity is with transmitting
Antenna number is added to exponential increase, it is difficult to apply in practice.
At present, MIMO detection method obtains extensive research, and more typical method includes two classes：One kind is linearly to examine
Survey method mainly has matched filtering (MF：Matched Filter), force zero (ZF：Zero Forcing), least mean-square error
(MMSE：Minimum Mean Square) and its mutation method, another kind of is non-linear detection method, is mainly had based on sequence
Stepwise derivation offset (OSIC：Ordered Successive Interference Cancellation), globular decoding
(SD：Sphere Decoding), K-Best methods and its mutation method etc..Although linear method with relatively low complexity,
Hardware is easy to implement, but performance is very poor in low signal-to-noise ratio；Nonlinear method obtains certain performance compared with linear method
Improve, but complexity also improves therewith.
However in extensive mimo system, although MF detection method complexities are minimum, performance is very poor, seriously limits
The practical application in extensive mimo system of MF detection methods, for this purpose, the present invention provides a kind of extensive MIMO systems
The new matched filtering detection method of middle 4QAM modulation.
The content of the invention
It is an object of the invention to provide a kind of new matched filtering inspections modulated for 4QAM in extensive mimo system
Survey method, detection method using the present invention can significantly improve the performance of traditional MF detection methods, and complexity is low to be easy to real
It is existing, and nearly optimal performance can be obtained in the uplink.
Technical scheme：A kind of new matched filtering detection side modulated for 4QAM in extensive mimo system
Method is as follows：
Step 1. initializes：
I=1,1≤i≤Nt, i expression ith iterations, NtFor transmitting antenna number；
Y(1)=Y, Y are reception signal phasor；
H(1)=H, H are channel matrix；
Step 2. ith iteration：Dock collection of letters vector Y(i)Matched filtering detection is carried out, obtains detection symbols vectorI.e.Wherein, ()HRepresent conjugate transposition computing, detection symbols vectorIn symbolic indication
ForJ is the location index of symbol；
Judge vectorIn symbol whether meet pre-determined threshold region
Wherein, T is threshold value,Expression takes real part computing,Expression takes imaginary-part operation, | | represent signed magnitude arithmetic(al)；
If vectorIn there are symbols to meet threshold areas S, then calculate in threshold areas S the real part of all symbols with it is empty
The sum of portion's absolute value, chooses and the symbol of value maximum carries out Interference Cancellation；Otherwise, vector is calculatedIn all symbols real part
The sum of with imaginary part absolute value, choose and symbol that value is maximum carries out Interference Cancellation；It concretely comprises the following steps：
kiRepresent that the real part character position maximum with imaginary part absolute value and value indexes, i.e., ith changes
The aerial position index of generation detection；
<·>mExpression takes the m rows of matrix, G(i)Channel matrix H during expression ith iteration(i)'s
Associate matrix；
Q () is constellation point reflection operator, i.e., is recovered to send letter according to maximum-likelihood criterion hard decision
Number；AsEstimate；
Perform Interference Cancellation：[·]nExpression takes the n-th of matrix to arrange；
Meanwhile update channel rectangle： Represent the n-th row of puncture table；
Step 3. repeats step 2, iteration to i=Nt, terminate iteration output detection symbols, demodulation recovers raw information ratio
It is special.
Beneficial effects of the present invention are：The present invention provides the new matched filtering detections in a kind of extensive mimo system
Method, the detection method preferentially carry out Interference Cancellation by carrying out thresholding screening to symbol to the symbol being located in thresholding, can
Significantly improve the performance of tradition MF detection methods, complexity is low to be easily achieved, and can be obtained in the uplink near optimal
Performance.
Description of the drawings
Fig. 1 is mimo system schematic diagram.
Fig. 2 is new matched filtering detection method flow chart proposed by the present invention.
Specific embodiment
The specific embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions are said herein to be ignored.
For preferably the present invention will be described, the system used in technical solution of the present invention is first introduced.
Mimo system：Such as Fig. 1, it is contemplated that a transmitting antenna number is Nt, reception antenna number be NrExtensive MIMO
System model generally has Nr≥Nt.In transmitting terminal, the binary bit stream string of equiprobability and statistical iteration is simultaneously converted into NtIt is a simultaneously
Capable sub- bit stream, then (2 are modulated to every sub- bit streamm- PSK or 2m- QAM modulation), modulated signal synchronously passes
Defeated, the Rayleigh mimo channel by slow fading reaches receiving terminal.In receiving terminal, the signal that each reception antenna receives is
NtThe superposition with the multiple signals on frequency band in time of root transmitting antenna signal, equivalent base band Model in Time Domain can represent
For:
Y=HX+N
WhereinRespectively receive signal phasor, transmitting signal phasor and noise
Signal phasor,For channel matrix, it is 0 that N, which obeys average, variance σ2Multiple Gauss distribution.
Specific embodiments of the present invention flow chart as shown in Figure 2：
Step 1：Initialization, i=1, Y(1)=Y, H(1)=H (wherein (1) represents the 1st iteration)；
Step 2：Dock collection of letters vector Y(i)Carry out MF detectionsJudge testing resultIn whether deposit
It is located at threshold areas in symbolIt is interior, wherein i, j represent respectively iterations and
Character position indexes；
If in the presence of, filter out the symbol in threshold areas, choose in these symbols real part and imaginary part absolute value it
With maximum elementIt makes decisions to obtainInterference Cancellation is performed, i.e.,Update channel square simultaneously
Battle array, deletes channel matrix H(i)KthiRow, i.e.,
If being not present, chooseIn the real part of all symbols and the maximum element of the sum of imaginary part absolute valueSentenced
Certainly obtainInterference Cancellation is performed, i.e.,Channel matrix is updated simultaneously, deletes channel matrix H(i)
kiRow, i.e.,
Step 3：If iteration does not complete, return to step 2；If iteration is completed, detection symbols are exported, demodulation recovers original
Beginning information bit.
Claims (1)
1. the matched filtering detection method that 4QAM is modulated in a kind of extensive mimo system, is as follows：
Step 1. initializes：
I=1,1≤i≤Nt, i expression ith iterations, NtFor transmitting antenna number；
Y(1)=Y, Y are reception signal phasor；
H(1)=H, H are channel matrix；
Step 2. ith iteration：Dock collection of letters vector Y(i)Matched filtering detection is carried out, obtains detection symbols vectorI.e.Wherein, ()HRepresent conjugate transposition computing, detection symbols vectorIn symbolic indication bej
It is indexed for character position；
Judge vectorIn symbol whether meet pre-determined threshold region S:Its
In, T is threshold value,Expression takes real part computing,Expression takes imaginary-part operation, | | represent signed magnitude arithmetic(al)；
If vectorIn there are symbols to meet threshold areas S, then it is exhausted to calculate the real part of all symbols and imaginary part in threshold areas S
To the sum of value, choose and the symbol of value maximum carries out Interference Cancellation；Otherwise, vector is calculatedIn all symbols real part with it is empty
The sum of portion's absolute value, chooses and the symbol of value maximum carries out Interference Cancellation；It concretely comprises the following steps：
kiRepresent that the real part character position maximum with imaginary part absolute value and value indexes, i.e., ith iteration is examined
The aerial position index of survey；
<·>mExpression takes the m rows of matrix, G(i)Channel matrix H during expression ith iteration(i)Conjugation
Transposed matrix；
<mrow>
<msub>
<mover>
<mi>x</mi>
<mo>~</mo>
</mover>
<msub>
<mi>k</mi>
<mi>i</mi>
</msub>
</msub>
<mo>=</mo>
<msub>
<mi>w</mi>
<msub>
<mi>k</mi>
<mi>i</mi>
</msub>
</msub>
<msup>
<mi>Y</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>)</mo>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Q () is constellation point reflection operator, wherein,Represent the real part member maximum with imaginary part absolute value and value
Element,AsEstimate；
Perform Interference Cancellation：[·]nExpression takes the n-th of matrix to arrange；
Meanwhile update channel rectangle： Represent the n-th row of puncture table；
Step 3. repeats step 2, iteration to i=Nt, terminate iteration output detection symbols, demodulation recovers original information bits.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6324209B1 (en) * | 2000-02-28 | 2001-11-27 | Golden Bridge Technology Inc. | Multi-channel spread spectrum system |
| CN1595835A (en) * | 2004-06-29 | 2005-03-16 | 中兴通讯股份有限公司 | A method and apparatus for increasing synchronous detection precision |
| CN101527919A (en) * | 2008-03-06 | 2009-09-09 | 中兴通讯股份有限公司 | Method and device for matched filtering in combined detection |
| CN104092479A (en) * | 2008-07-18 | 2014-10-08 | 美满电子科技(上海)有限公司 | Activation code detection method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6324209B1 (en) * | 2000-02-28 | 2001-11-27 | Golden Bridge Technology Inc. | Multi-channel spread spectrum system |
| CN1595835A (en) * | 2004-06-29 | 2005-03-16 | 中兴通讯股份有限公司 | A method and apparatus for increasing synchronous detection precision |
| CN101527919A (en) * | 2008-03-06 | 2009-09-09 | 中兴通讯股份有限公司 | Method and device for matched filtering in combined detection |
| CN104092479A (en) * | 2008-07-18 | 2014-10-08 | 美满电子科技(上海)有限公司 | Activation code detection method and device |
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