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A codec structure with input/decode/output

A codec and decoder technology, which is applied in the field of wireless communication signal processing and channel coding and decoding, can solve the problems of encoder complexity, large delay, and low gain performance, and achieve no loss of error performance and low delay , low latency effect

Inactive Publication Date: 2019-09-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing convolutional coding with small gain performance and large delay due to the complexity of the encoder, and proposes a "codec structure with input / decoding / output", specifically , using convolutional coding combined with Viterbi decoding to realize the codec structure of "side input / side decoding / side output"

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  • A codec structure with input/decode/output
  • A codec structure with input/decode/output
  • A codec structure with input/decode/output

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Embodiment 1

[0031] The improvement of the encoder in the "a codec structure with input / decoding / output" of the present invention, in part (1), increases the encoding constraint length part, and the specific constraint length is set to be greater than 5, which is generally Convolutional coding, the coding constraints are very small, mostly only 3 to 5, generally less than 10. This is because the number of states of the Viterbi decoder increases exponentially according to the length of the memory, and if the constraint length is large, the Viterbi decoder cannot work because the storage and operation complexity is too large.

[0032] (2) After increasing the constraint length, improve the belief propagation algorithm so that it can "input, decode, and output", and the adder uses the addition in the finite field GF(q); each input symbol is multiplied by a non-zero The encoding coefficients then participate in the encoding of the corresponding symbols, so that they can be "input, decode, and ...

Embodiment 2

[0037] The "coder-decoder structure of input / decode / output" proposed by the present invention has two significant differences between the improved new encoder and the conventional convolutional encoder: (1) the memory length of the improved encoder can be Arbitrarily specified, when the length is less than 10, the encoder is a conventional convolutional code, and a Viterbi decoder can be used to achieve maximum likelihood decoding; when the length is greater than 10, reaching tens, hundreds or thousands, this The encoding is actually no longer a conventional convolutional encoding, but a tailless LDPC encoding. (2) The number of symbols that have a connection relationship between the encoded output symbols and the symbols in the memory is randomly generated according to the degree of encoding, and the connection relationship is also random. Conventional convolutional coding, its coding relationship is completely fixed.

[0038] The encoded information can be continuously inpu...

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Abstract

The invention relates to an instant decoding technology of a codec structure capable of realizing simultaneous input, decoding and output, belonging to the technical field of wireless communication signal processing and signal channel coding and decoding. The invention provides a codec structure capable of realizing simultaneous input, decoding and output, and particularly relates to a codec structure for realizing the simultaneous input, decoding and output by adopting a convolutional encoding technique to be combined with decoding. When the codec structure is used for coding and decoding, the codec structure can begin to work without waiting for all encoding symbols to be inputted to a decoder but inputting partial signal channel symbols, and the decoder continuously outputs decoding symbols along the continuously-inputted signal channel data. By adopting a regular structure, the codec is simplified, the coding and decoding complexity of a convolutional code can be alleviated, and the low delay of the codec is realized by adopting the iterative decoder based on a production line structure.

Description

technical field [0001] The invention relates to a real-time decoding technology, in particular to a codec structure with input / decoding / output simultaneously, and belongs to the technical field of wireless communication signal processing and channel coding and decoding. Background technique [0002] From the middle of the last century to the present, whether in military or civilian communication fields, the demand for wireless communication based on broadband, low interception rate, and strong anti-interference signal transmission technology is increasing. With the widespread development and popularization of equipment related to civilian standards such as IEEE 802.11 series WLAN and CCSDS military standards, in the field of signal processing of wireless communications, spread spectrum, frequency hopping and technology such as variable code spread spectrum. With the continuous development of signal processing technology and the continuous improvement of people's requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/23
Inventor 傅雄军袁大森卢继华李祥明李利军黄承飞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY