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Method for improving structure of convolution code encoder

A convolutional code and encoder technology, which is applied in the field of improvement of the convolutional code encoder structure, and can solve the problems of difficult hardware implementation, low bit error rate, and small coding gain.

Inactive Publication Date: 2012-05-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the small coding gain and the complex LDPC code coding in the existing convolutional coding, and the performance defects that are not easy to be realized by hardware, propose a method for improving the structure of the convolutional code encoder, and construct a sparse matrix-based Convolutional code, by designing the parameters of the encoder of the LDPC convolutional code, designing the parity check matrix H(t) of the LDPC convolutional code, improving the coding structure of the convolutional code, achieving high performance and low bit error rate

Method used

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  • Method for improving structure of convolution code encoder
  • Method for improving structure of convolution code encoder
  • Method for improving structure of convolution code encoder

Examples

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Embodiment 1

[0043] A (127, 3, 6) time-varying, code rate R = 1 / 2 LDPC convolutional code implementation steps.

[0044] Step 1. Design as figure 2 The shown LDPC system convolutional code, its design parameters are: register memory length m s = 127, row weight w r = 6, column weight w c =3, b=1, c=2, t=2048. The regular random LDPC block code check matrix H is constructed by using Mackay's method. First, the columns of the parity check matrix H increase column by column from left to right, and finally form the entire parity check matrix. the weight w of each column c = 3, and the position of "1" in each column of the sparse matrix is ​​randomly selected, but the row weight must not exceed w r =6. And it is guaranteed that the submatrix partitioned by the matrix H The latter (c-b)×(c-b) matrix is ​​an identity matrix. If the requirements cannot be met until the last column is set, H must be reset or some columns should be canceled from right to left to reset until the weight of ...

Embodiment 2

[0062] A (3, 2, 3) time-invariant, code rate R = 1 / 3 LDPC convolutional code implementation steps.

[0063] Step 1, utilize QC-LDPC code design method, select element a=2, b=6 from GF (2); Then o(a)=3, o(b)=2, obtain check matrix and be:

[0064] H = I 1 I 4 I 2 I 6 I 3 I 5

[0065] I in the matrix x is a 7×7 identity matrix that is cyclically shifted left by x units row by row. The minimum code distance d of this LDPC regular code ...

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Abstract

The invention relates to a method for improving a structure of a convolution code encoder, particularly relates to a method which is applied to wireless local area network (WLAN) and long time evolution (LTE) relevant standard systems and used for improving the structure of the convolution code encoder, and belongs to the technical field of wireless mobile communication. By designing parameters of the encoder for a low density parity check (LDPC) convolution code and a check matrix H (t) of the LDPC convolution code and improving the encoding structure of the convolution code, the high performance and low error rate are realized. The LDPC convolution code integrates the advantages of both an LDPC code and the convolution code; due to the regular structure, the convolution code encoder has high-speed encoding capability; and the hardware of the encoder is simplified; the encoding complexity of the LDPC convolution code is reduced, and the parallel iterative decoding can be performed to realize low time delay; under the condition of rate compatibility, during forward error correction control (FEC) of IEEE 802.16m, the LDPC convolution code be used for realizing hybrid automatic repeat request (HARQ) which supports an IR type; therefore, the spectrum efficiency and the system throughput are improved.

Description

technical field [0001] The invention relates to a method for improving the structure of a convolutional code encoder, in particular to a method for improving the structure of a convolutional code encoder used in WLAN and LTE-related standard systems, and belongs to the technical field of wireless mobile communications. Background technique [0002] The demand for broadband wireless communication is increasing day by day, and civil mobile communication technology based on wireless local area network and LTE has developed into a vital position in the mobile network. With the successful formulation and continuous improvement of IEEE 802.11 wireless LAN and TD-LTE standards, wireless communication technology has been further developed and applied. The IEEE802.11n standard has comprehensively improved the 802.11 standard, and introduced OFDM+MIMO in the physical layer, which has improved the transmission rate in an all-round way; in the media access control (MAC) layer, technolog...

Claims

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Application Information

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IPC IPC(8): H03M13/23
Inventor 卢继华何建华李祥明孙磊卜祥元安建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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