BCM码在AWGN信道与Rayleigh衰落信道中的性能仿真  

Simulations of several BCM codes in the AWGN and Rayleigh fading channel

作　　者：骆亚娟[1] 张伟 鞠德航 

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071 [2]航天工业总公司504所,陕西西安710100

出　　处：《西安电子科技大学学报》2000年第3期381-384,共4页Journal of Xidian University

基　　金：国家自然科学基金资助项目

摘　　要：采用Imai与Hirakawa提出的多层编码方法可构造出在AWGN信道与Rayleigh衰落信道中好的分组调制 (BCM)码 ,恰当选择成分码可使BCM码有较大的编码增益 .文章对几种BCM码在AWGN及Rayleigh衰落信道中的性能进行了仿真 ,并在这些BCM码之间以及它们与相同频带利用率的未编码系统之间进行了比较 ,结果表明 :在AWGN信道中 ,BCM码较相同频带利用率下的未编码系统有 1～ 3dB的编码增益 ,并且这些编码增益值主要取决于BCM码的最小平方欧氏距离 ;而在Rayleigh衰落信道中 ,编码增益值可达到 6～ 17dB ,决定此值的主要因素为BCM码的汉明距 。The multilevel coding technique proposed by Imai and Hirakawa can be used to construct BCM codes of good error performance both in the AWGN and Rayleigh fading channel. A large coding gain can be obtained by the appropriate selection of the component codes. In this paper, simulations for several BCM codes are performed both in the AWGN and Rayleigh fading challel, a comparison is made among these BCM codes as well as between BCM codes and the uncoded system of the same bandwidth efficiency, and the results show that compared with the uncoded system without loss of bandwidth efficiency, in the AWGN channel BCM codes offer a 1～3 dB coding gain which depends mainly on its Mimimum Squared Distance while in the Rayleigh fading channel, the same value decided by the mimiumum Hamming distance of the BCM code reaches 7～16 dB, with the multistage decoding method adopted on all occasions.

关 键 词：BCM码 性能仿真 编码增益 AWGN信道 衰落信道 

分 类 号：TN911.2[电子电信—通信与信息系统] O236[电子电信—信息与通信工程]