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Improved Successive Cancellation Flip Decoding of Polar Codes Based on Error Distribution. (arXiv:1711.11096v1 [cs.IT])
来源于:arXiv
Polar codes are a class of linear block codes that provably achieves channel
capacity, and have been selected as a coding scheme for $5^{\rm th}$ generation
wireless communication standards. Successive-cancellation (SC) decoding of
polar codes has mediocre error-correction performance on short to moderate
codeword lengths: the SC-Flip decoding algorithm is one of the solutions that
have been proposed to overcome this issue. On the other hand, SC-Flip has a
higher implementation complexity compared to SC due to the required
log-likelihood ratio (LLR) selection and sorting process. Moreover, it requires
a high number of iterations to reach good error-correction performance. In this
work, we propose two techniques to improve the SC-Flip decoding algorithm for
low-rate codes, based on the observation of channel-induced error
distributions. The first one is a fixed index selection (FIS) scheme to avoid
the substantial implementation cost of LLR selection and sorting with no cost
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