期刊
IEEE COMMUNICATIONS LETTERS
卷 21, 期 6, 页码 1221-1224出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2017.2656126
关键词
Polar codes; belief propagation decoding; successive cancellation list decoding
资金
- National Science Foundation [CCF-1405119]
- European Research Council [259663]
- Spanish Ministry of Economy and Competitiveness [TEC2012-38800-C03-03]
- European Research Council (ERC) [259663] Funding Source: European Research Council (ERC)
Polar code constructions based on mutual information or Bhattacharyya parameters of bit-channels are intended for hard-output successive cancellation (SC) decoders, and thus might not be well designed for use with other decoders, such as soft-output belief propagation (BP) decoders or successive cancellation list (SCL) decoders. In this letter, we use the evolution of messages, i.e., log-likelihood ratios, of unfrozen bits during iterative BP decoding of polar codes to identify weak bit-channels, and then modify the conventional polar code construction by swapping these bit-channels with strong frozen bit-channels. The modified codes show improved performance not only under BP decoding, but also under SCL decoding. The code modification is shown to reduce the number of low-weight codewords, with and without CRC concatenation.
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