多元速率兼容 LDPC 码的自适应编码调制系统研究

摘要

本文设计了一种基于有限域 GF（q）上的多元速率兼容 LDPC（RC-LDPC）码结合高阶调制的自适应编码调制（Adaptive Coded Modulation，ACM）系统。并提出了多元 RC-LDPC 码在独立和相关衰落信道下的增量冗余型自适应编码调制方案。本方案中多元 LDPC 码码率从1／3到5／6灵活变化，以较低的系统复杂度，有效提高了系统的频带利用率。仿真结果表明：随着系统吞吐率提高，多元 ACM系统相对于二元 ACM系统具有越来越明显的编码增益，最高可达约9 dB。%In this paper,high-order adaptive coded modulation (ACM)schemes based on non-binary rate-compatible (RC) LDPC codes over GF(q)were designed.Further,the incremental redundancy schemes of non-binary RC-LDPC-based ACM system over independent and correlative fading channels were proposed.In the proposed schemes,the LDPC encoder can pro-vide a flexible code-rate range from 1 /3 to 5 /6 by shortening and puncturing algorithm.And the proposed schemes can im-prove the spectrum efficiency of system with little extra complexity.Simulations show that,with higher throughput rate,much more visible even 9 dB coding gain can be obtained by proposed non-binary ACMsystem than binary system.