Maximum likelihood decoding method and apparatus, computer readable medium, and terminal

A maximum likelihood algorithm and maximum likelihood technology, applied in the field of decoding, to achieve the effect of reducing computational complexity

Active Publication Date: 2018-11-02
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is how to redu

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  • Maximum likelihood decoding method and apparatus, computer readable medium, and terminal
  • Maximum likelihood decoding method and apparatus, computer readable medium, and terminal
  • Maximum likelihood decoding method and apparatus, computer readable medium, and terminal

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Embodiment Construction

[0041] Taking 4*2STBC as an example, since 4*2STBC is non-orthogonal space-time coding, if maximum likelihood space-time decoding is to be performed at the receiver side, it is necessary to perform QR decomposition on the 4x4 channel equivalent matrix.

[0042] Since 4*2STBC transmits a total of 4 layers of spatial streams (two layers of spatial streams are a pair, a total of 2 pairs), so when performing QR decomposition on the channel equivalent matrix, it is necessary to perform two QR decompositions on the equivalent channel matrix to facilitate Separate the two pairs of spatial streams, namely:

[0043] H=Q 0 L;

[0044] H=Q 1 R;

[0045] Among them, Q 0 and Q 1 is an orthogonal matrix, and L and R are lower and upper triangular matrices, respectively.

[0046] In the above decoding process, two QR decompositions will make the calculation complexity of the entire decoding process relatively high.

[0047] In view of the above problems, the embodiment of the present ...

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Abstract

The invention provides a maximum likelihood decoding method and apparatus, a computer readable medium, and a terminal. The method comprises the following steps: determining a corresponding equivalentchannel matrix based on a preset modulation manner; uniformly dividing the equivalent channel matrix into a plurality of sub-blocks; performing matrix operation on the plurality of sub-blocks of the equivalent channel matrix to obtain a parameter vector of a maximum likelihood algorithm; and based on the maximum likelihood algorithm, solving a soft output bit likelihood ratio of each layer of spatial flow from the parameter vector of the maximum likelihood algorithm. By application of the scheme, the computational complexity during decoding by using the ML algorithm can be reduced.

Description

technical field [0001] The present invention relates to the technical field of decoding, in particular to a maximum likelihood decoding method and device, a computer-readable medium, and a terminal. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end, respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, thereby improving communication quality. [0003] In a MIMO system with 4 transmit antennas and 2 receive antennas (ie 4*2), the transmitter can use Space Time Block Code (STBC) or Space Frequency Block Code (SFBC) ) for coding, and correspondingly, the receiving end can use a linear space-time decoding algorithm or a linear space-frequency decoding algorithm for decoding. However, when the linear algorithm is used for decoding, the symbol error performance i...

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Application Information

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IPC IPC(8): H04L1/00H04B7/08
CPCH04B7/0413H04B7/08H04L1/0054
Inventor杨宜进杜柏生李俊强
OwnerSPREADTRUM COMM (SHANGHAI) CO LTD