Method for decoding block product turbo code (BPTC) under 4-frequency-shift keying (4FSK) modulation mode

Abstract

The invention relates to the technical field of communication, in particular to a method for decoding a block product turbo code (BPTC) under a 4-frequency-shift keying (4FSK) modulation mode. The method for decoding the BPTC under the 4FSK modulation mode comprises the following steps of: 1) converting received sign soft information into bit soft information; 2) performing amplitude limitation processing on the bit soft information in the step 1); 3) performing 8-bit quantification on the bit soft information subjected to the amplitude limitation processing; and 4) iteratively decoding the bit soft information subjected to the 8-bit quantification, and when the iterated bit soft information is in accordance with an iteration stopping condition, stopping the iteration. Compared with the prior art, the decoding method has the advantages that: the performance is retained and the calculation amount can be reduced and the decoding delay time can be shorten.

Description

Technical field [0001] The invention relates to the field of communication technology, and in particular to a decoding method of BPTC code in 4FSK modulation mode. Background technique [0002] Channel coding and modulation are the essence of the entire communication theory and are widely used in various fields such as aerospace deep space communications, personal mobile communications, public telephone networks, the Internet and DVD error correction, providing efficient and reliable technical support for social informatization. [0003] Turbo product code was proposed by Elias in 1954. It is the first error-correcting code that can achieve error-free transmission at non-zero code rate after the introduction of Shannon information theory. It is a kind of code that can be constructed using two or more short codes. An effective method for long codes can be regarded as a serial concatenated code with a row-column interleaver inserted in the middle. Consider two system linear b...

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Problems solved by technology

[0020] The purpose of the present invention is to provide a decoding method of BPTC code under 4FSK modulation mode, to solve the problem that the existing soft-decision decoding method in the prior art operates on real numbers, which will lead to the deterioration of real number calculations in practical applications and the technical problem of increasing the amount of computation

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