Turbo code high-speed decoding method based on parallel and windowing structure

Abstract

The invention relates to a Turbo code high-speed decoding method based on a parallel and windowing structure, wherein the method is achieved through a Turbo code high-speed decoder. The method relates to a first input buffer module, a second input buffer module, a first extrinsic information storage module, a second extrinsic information storage module, a interweaving / de-interweaving module, N SISO decoding units, a hard-decision module and an output buffer module, wherein the first input buffer module and the second input buffer module continuously receive data frames input from the exterior in a ping-pong operating mode, first component decoding and second component decoding iterated for the first time are completed through the N SISO decoding units, in this way, first component decoding and second component decoding iterated for the Nth time are completed, iteration is ended, LLR information obtained through the second component decoding iterated for the Mth time is subjected to de-interweaving, the de-interweaving result is subjected to a hard decision, and finally, the hard decision result is stored in the output buffer module. According to the method, the advantages of parallel decoding and sliding window decoding are combined, the decoding running speed is substantially increased, and the good decoding property is achieved.

Description

technical field [0001] The invention relates to a method for realizing high-speed decoding of Turbo codes based on a parallel and windowing structure, and belongs to the technical field of satellite mobile communication systems. Background technique [0002] In the satellite mobile communication system, the signal received by the receiver is often affected by fading channels and interference noise. In this regard, satellite mobile communication systems often use error control code Turbo or LDPC (Low Density Parity Check Code) codes with high channel coding gain to improve the reliability of information transmission, reduce the bit error rate and approach the Shannon limit. The advantage of the Turbo code is that its short codeword has better bit error performance under the condition of low signal-to-noise ratio, and is more suitable for burst transmission or real-time communication applications. At present, Turbo code has been used as one of the recommended channel coding s...

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Problems solved by technology

In this way, when the data sequence is relatively long, the decoding delay of the MAP algorithm is relatively large, and the decoding delay must be reduced by modifying the algorithm

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