Low-bit-rate biorthogonal code decoder and decoding method

Abstract

The invention provides a low-code-rate biorthogonal code decoder and a decoding method. The decoder comprises two branch decoders; each branch decoder comprises an extrinsic information and prior information storage unit, a backward metric calculation and storage unit and a forward metric and posterior information calculation unit; the extrinsic information and prior information storage unit is used for determining prior information based on posterior information and stored extrinsic information; the backward metric calculation and storage unit is used for performing backward recursion estimation based on a signal to be decoded and the prior information and outputting a backward metric value; the forward metric and posterior information calculation unit is used for performing forward recursive estimation based on the signal to be decoded, the prior information and the backward metric value, and outputting a forward metric value and posterior information; if the number of times of forward recursion estimation reaches the preset maximum number of iterations, a decoding result is outputted; the complexity of the structure and the implementation mode of the biorthogonal code decoder is reduced, and the low-bit-rate biorthogonal code decoder is easy to apply in engineering.

Description

technical field [0001] The invention relates to the technical field of channel coding and decoding, in particular to a low code rate bi-orthogonal code decoder and a decoding method. Background technique [0002] Channel coding technology ensures the reliability of communication transmission by adding redundant information. As a code set with good autocorrelation and zero cross-correlation, bi-orthogonal codes can be directly used in the transmitter to generate acquisition and synchronization sequences, which can greatly simplify the structure of the transmitter and reduce the complexity of implementation. Bi-orthogonal-Turbo codes combine the low bit-rate characteristics of bi-orthogonal codes with the high coding gain of Turbo codes, and are well applied in low-bit-rate communication scenarios. However, the decoding method of biorthogonal-Turbo codes is relatively complex in engineering technology implementation, and a low-complexity decoding method of biorthogonal-Turbo ...

AI Technical Summary

Problems solved by technology

However, the decoding method of biorthogonal-Turbo codes is relatively complicated in engineering technology implementation, and a low-complexity biorthogonal-Turbo code decoding method is urgently needed for engineering implementation

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