arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1701.01628cs.ITmath.IT
收藏

极化码在BMS信道下的错误概率下界

A Lower Bound on the Probability of Error of Polar Codes over BMS Channels

Boaz Shuval, Ido Tal

摘要:

极化码是具有显式和低复杂度构造、编码和解码算法的实现容量的码族。极化码的解码基于逐次消除解码器,逐次消除解码器以逐位方式解码。当至少一个比特被错误解码时,发生解码错误。各种码字比特是相关的,但是极化码的性能分析忽略了这种依赖性:上限基于联合界,而下限基于性能最差的比特。通过同时考虑两个比特的错误概率,给出了下界的改进。由于极化码固有的大字母表大小,这些很难明确计算。在这项研究中,我们提出了一种方法来下界的比特对的错误概率。我们开发了几个变换对合成通道,使合成通道服从字母减少。我们的方法产生的下界,显着改善目前已知的连续消除解码下的极性码的下界。

英文摘要:

Polar codes are a family of capacity-achieving codes that have explicit and low-complexity construction, encoding, and decoding algorithms. Decoding of polar codes is based on the successive-cancellation decoder, which decodes in a bit- wise manner. A decoding error occurs when at least one bit is erroneously decoded. The various codeword bits are correlated, yet performance analysis of polar codes ignores this dependence: the upper bound is based on the union bound, and the lower bound is based on the worst-performing bit. Improvement of the lower bound is afforded by considering error probabilities of two bits simultaneously. These are difficult to compute explicitly due to the large alphabet size inherent to polar codes. In this research we propose a method to lower-bound the error probabilities of bit pairs. We develop several transformations on pairs of synthetic channels that make the resultant synthetic channels amenable to alphabet reduction. Our method yields lower bounds that significantly improve upon currently known lower bounds for polar codes under successive-cancellation decoding.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑