码率自适应LDPC码删余算法

摘要

鉴于无线通信信道的时变特性,信道纠错编码必须具备码率自适应的功能.现有的分组拣选算法尽管能构造出性能优秀的码率自适应删余型LDPC码,但达到的最高删余码率受到限制.对此,该文提出一种新的删余算法-分层拣选算法,解决了最高删余码率受限的问题,使码率能够无限接近1,且适用于任意LDPC码.AWGN信道下的仿真结果表明,所提出的算法较分组拣选算法具有更好的性能.%Rate compatibility of forward error correction codes is required to accomplish high throughput and reliability over time-varying wireless channels. The grouping and sorting (GS) algorithm can produce rate-compatible puncturing LDPC (RCP-LDPC) codes with good performance. However, there is a limit in the achievable highest puncturing rate. In this paper, a novel layer-by-layer sorting algorithm is proposed to design RCP-LDPC without any limitation in the highest puncturing rate. The algorithm can be applied to an arbitrary LDPC code to obtain a code rate infinitely close to one. Simulation over AWGN channels shows that the proposed algorithm has superior performance as compared to the GS algorithm.