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Method and apparatus for signal detection

A technology of signal detection and maximum likelihood detection, which is applied in the direction of preventing/detecting errors through diversity reception, channel estimation, baseband systems, etc., and can solve the problems of high signal detection complexity and high computational complexity.

Inactive Publication Date: 2013-12-04
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The maximum likelihood detection algorithm in the prior art is calculated according to the above formula (1) to obtain the maximum likelihood solution, which needs to be In the case of high modulation order, the amount of calculation is very high, resulting in high complexity of signal detection

Method used

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  • Method and apparatus for signal detection

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Embodiment 1

[0060] In the LTE system, in the downlink transmission mode of two-layer spatial multiplexing transmission (modes 3, 4, 8), it is assumed that the symbol s of the first transmission layer 1 Using 16QAM (Quadrature Amplitude Modulation, phase quadrature amplitude modulation) modulation, assuming that the second layer transmitted symbols s 2 Adopt QPSK (Quadrature Phase Shift Keying, four-phase phase shift keying) modulation. Taking the LLR calculation based on the decision amount as an example, the execution steps are as follows:

[0061] Step 0: Compare s 1 And s 2 The modulation order of, find s 2 The modulation order of s is lower. 2 Exhaustively.

[0062] Step 1. Perform the following calculations: The value range of i is an integer in [1,4], that is, s 2 Bring in all possible constellation points, remove interference, and output 4

[0063] Step 2. According to each Get 1 s respectively 1 Judgment

[0064] Step 3. For each Carry out hard decisions respectively to get the corre...

Embodiment 2

[0069] In the LTE system, in the two-layer spatial multiplexing transmission mode (modes 3, 4, 8), it is assumed that the symbol s of the first transmission layer 1 Using 16QAM (Quadrature Amplitude Modulation, phase quadrature amplitude modulation) modulation, assuming that the second layer transmitted symbols s 2 Adopt QPSK (Quadrature Phase Shift Keying, four-phase phase shift keying) modulation. Taking the LLR calculation based on the decision amount as an example, the execution steps are as follows:

[0070] Step 0: Compare s 1 And s 2 The modulation order of, find s 2 The modulation order of s is lower. 2 Exhaustively.

[0071] Step 1. Perform the following calculations: The value range of i is an integer in [1,4], that is, s 2 Bring in all possible constellation points, remove interference, and output 4

[0072] Step 2. According to each Get 1 s respectively 1 Judgment

[0073] Step 3. For each Carry out hard decisions respectively to get the corresponding 1 constellation ...

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Abstract

The embodiment of the invention, which relates to the field of the wireless communication technology, discloses a method and apparatus for signal detection, wherein the method and the apparatus are used for reducing complexity of maximum likelihood detection for signal. According to each constellation symbols that may be transmitted at a first transmission layer of two transmission layers, interference cancellation is carried out on receiving vectors respectively; according to each result value obtained by the interference cancellation, a constellation symbol that may be transmitted at a second transmission layer is obtained; measure values corresponding to combination of a constellation symbol that may be transmitted at each first transmission layer and the constellation symbol that may be transmitted at the second transmission layer is respectively determined; and according to the combination corresponding to the obtained minimum measure value, the constellation symbol transmitted at the first transmission layer and the constellation symbol transmitted at the second transmission layer are determined. When the method and the apparatus are used, the complexity of signal maximum likelihood detection can be effectively reduced.

Description

Technical field [0001] The invention relates to the field of wireless communication, and in particular to a signal detection method and device. Background technique [0002] At present, in the multi-antenna system, the signal receiving end uses the maximum likelihood detection algorithm to detect the received signal, thereby obtaining the constellation symbols transmitted by each transmission layer. [0003] When the maximum likelihood detection algorithm detects the received signal, it finds the optimal combination from all possible combinations of constellation symbols transmitted on each transmission layer as the output maximum likelihood solution. The maximum likelihood is obtained according to the following formula (1) Likelihood solution [0004] x ^ ML = arg min x A S N L | | y - Hx | | 2 . . . ( 1 ) [0005] Among them, y represents the receiving vector, H represents the channel matrix, x represents th...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
CPCH04L25/0204H04L25/03171H04L1/06
Inventor 吴凯
Owner CHINA ACAD OF TELECOMM TECH