摘要
在下一代移动通信系统中,为了满足移动用户对高速、宽带数据传输业务不断增长和更高质量的要求,需要对现有物理层的关键技术作进一步的改进、完善和实用化,例如在信道编码方面,就采用了革命性的LDPC码。而PEG算法则是目前构造中短码长LDPC码最有效的算法之一。通过借鉴ACE算法,在对已有的结构优化设计算法深入理解的基础上,对PEG算法进行了改进,得到了一种可以进一步优化LDPC码环分布和最小距离的改进算法。仿真结果表明:由新算法构造出来的LDPC码的环分布和码重分布都明显优于PEG算法;其性能曲线在低信噪比时与原算法相差不大,而随着信噪比的增加可以有效地降低错误平层。
In the next generation communication systems,in order to satisfy the ever increasing and high-quality requirements for high-speed data transmission,it is necessary to further improve and perfect the existing key techniques in the physical layer.For instance,the revolutionary LDPC codes is adopted for channel coding,and PEG algorithm is one of the most effective methods in constructing LDPC codes.Based on ACE algorithm and the in-depth understanding of the existing optimized design methods,the ring distribution for LDPC code is improved,and thus a modified algorithm for further optimizing the ring distribution and minimum distance of LDPC code is achieved.Simulation result shows that the ring distribution and code-weight distribution of the modified codes are significantly better than those constructed by PEG algorithm.With the increase of SNR value,the modified algorithm demonstrates its advantage in lowering the error floor.
出处
《通信技术》
2010年第5期56-57,60,共3页
Communications Technology
