The low-density parity check codes (LDPC codes) are block codes whose performances are close to the Shannon limit. LDPC codes have the strong ability for error correction. The decodingalgorithm of LDPC codes has a gr...
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ISBN:
(纸本)9783030191535;9783030191528
The low-density parity check codes (LDPC codes) are block codes whose performances are close to the Shannon limit. LDPC codes have the strong ability for error correction. The decodingalgorithm of LDPC codes has a great influence on their performances. The belief propagation (BP) algorithm is a commonly used soft decision decoding algorithm. The algorithm decodes by information iterations, and its complexity does not increase rapidly with the increase of code length. This paper mainly analyze the probabilistic domain BP decodingalgorithm, log-domain BP decodingalgorithm and minimum sum decodingalgorithm, the bit error performance of LDPC codes under BP algorithm is studied, and the influence of the number of iterations on the BP decodingalgorithm is also shown by simulation results.
A hybrid threshold softdecisiondecoding scheme which combines a Chase 2 algorithm with a bit-by-bit decisiondecodingalgorithm is presented. For higher signal-to-noise ratios (SNRs), its behaviour is not inferior t...
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A hybrid threshold softdecisiondecoding scheme which combines a Chase 2 algorithm with a bit-by-bit decisiondecodingalgorithm is presented. For higher signal-to-noise ratios (SNRs), its behaviour is not inferior to that of the corresponding bit-by-bit decodingalgorithm. This scheme can overcome the exponential increase of the test patterns used in the Chase 2 algorithm, as d (the minimum Hamming distance of code) increases.
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