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LDPC (low density parity code) layering BP (belief propagation) decoding algorithm based on least-mean-square-error criterion and decoder structure

A LDPC code, mean square error technology, applied in the field of multimedia wireless sensor network communication system, can solve the problems of slow decoding speed and small data throughput, etc.

Inactive Publication Date: 2013-08-28
SOUTHEAST UNIV
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Problems solved by technology

The advantage is that it can save a lot of hardware resources, but the decoding speed is too slow and the data throughput is too small, especially when the code length is large

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  • LDPC (low density parity code) layering BP (belief propagation) decoding algorithm based on least-mean-square-error criterion and decoder structure
  • LDPC (low density parity code) layering BP (belief propagation) decoding algorithm based on least-mean-square-error criterion and decoder structure
  • LDPC (low density parity code) layering BP (belief propagation) decoding algorithm based on least-mean-square-error criterion and decoder structure

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

[0047] The decoder supporting multiple code lengths and code rates proposed by the present invention is aimed at the QC-LDPC code proposed in the IEEE 802.16e standard, including four codes of 1 / 2, 2 / 3, 3 / 4 and 5 / 6 Rate. Each row of the check matrix includes 24 sub-matrices, and the number of sub-matrices in each column is determined by the code rate (for example, when the code rate is 2 / 3, each column includes 8 sub-matrices). At the same time, there are 19 types of sub-matrix sizes (also called expansion factors), including a step length interval of 4 from 24 to 96. Therefore, the code includes 19 code lengths ranging from 576 to 2304. Such as figure 1 As shown, the decoder structure includes a control module, an input and output cache, 96 groups of 7-bit subtractors, 96 groups of layered information processing modules, 96 groups of 7-bit adders...

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Abstract

The invention discloses an LDPC (low density parity code) layering BP (belief propagation) decoding algorithm based on a least-mean-square-error criterion. In the algorithm provided by the invention, the complexity of algorithm implementation is reduced through constructing a linear equation to approach to the operational formula at a check node in the BP algorithm, and the decoding performance of the algorithm is improved by utilizing the least-mean-square-error criterion to solve the optimum solution of a linear equation coefficient. Simultaneously a layering decoding idea is introduced into the algorithm, the convergence of the algorithm can be improved, and the requirement on the memory space is reduced. Based on the algorithm, the invention provides a LDPC decoder structure provided with a partial parallel structure and used for a multimedia wireless sensing network. The decoder supports the decoding of the LDPCs with various code lengths and code rates, and has the advantages ofless system resource occupation, high data throughput, low system power consumption, and the like.

Description

technical field [0001] The invention relates to a communication system of a multimedia wireless sensor network, in particular to a decoding method and structure realization of a decoder using LDPC as a channel error correction code in baseband signal processing of a multimedia wireless sensor network. Background technique [0002] WMSN (Wireless Multimedia Sensor Network) is a new type of sensor network that introduces audio, video, image and other multimedia information perception functions on the basis of traditional WSN (Wireless Sensor Network). It perceives the multimedia information of the surrounding environment with the help of multimedia sensors on the nodes, and transmits the data to the information convergence center through multi-hop relay. It integrates multiple disciplines such as modern sensor technology, microelectronics technology, communication technology, embedded computing technology and distributed information processing technology, and is an emerging in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/11H04L1/00
Inventor 时龙兴徐勐张萌吴建辉周传海丁小军王涛
Owner SOUTHEAST UNIV
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