Joint coding and decoding device and method for source channel

A codec and encoder technology, applied in baseband systems, digital transmission systems, electrical components, etc., can solve the problems of codec complexity, low channel resource utilization, lack of practicability, etc., and achieve low codec delay. , high encoding rate, low complexity effect
CN100525262CInactive Publication Date: 2009-08-05BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2009-08-05
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses the structure and working principle of an information source channel joint codec and its codec parameter optimization design method based on vector quantization. The codec in the present invention is divided into encoder and decoder two parts, and encoder is by the input information source message vector buffer, encoding index generator, channel signal output unit, channel signal power and other encoding parameter memory, reconstruction information source Composed of message memory and coded channel signal memory; decoder consists of input channel signal vector buffer, decoding index generator, reconstructed source message output unit, decoded channel signal memory and reconstructed source message memory. The codec can directly encode a channel-optimized K-dimensional channel signal that strictly meets the requirement of average transmit power from L-dimensional source information, and realize source bandwidth compression or expansion. The codec has simple structure, low coding and decoding complexity, and strong versatility. The codec has excellent performance and has the characteristics of flexible degradation and flexible improvement, especially suitable for multi-user and time-varying channel applications.
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Description

Technical field

[0001] The invention belongs to the field of communications, and specifically relates to a source channel codec and a coding and decoding method. Background technique

[0002] At present, most of the communication systems are built under the framework of the separated structure communication system based on Shannon's separation theory. Such as figure 1 Shown is the general model of a separate structure communication system: from the source to the sink, it is divided into five parts: source coding, channel coding, channel, channel decoding, and source decoding.

[0003] The simplification and convenience brought by the separate design of the communication system objectively promote the development and application of the separate structure communication system, but it also brings some inherent shortcomings that cannot be avoided: First of all, from the perspective of feasibility, the separation of the communication system requires To achieve the overall optimum, th...

Claims

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