调制电平随谱效率增长非指数上升的编码调制  

A Novel Coded Modulation Scheme with Smaller Constellation

作　　者：孙鹏[1] 李道本[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《北京邮电大学学报》2012年第2期68-71,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家科技重大专项项目(2009ZX03003-006-04)

摘　　要：为了降低通信系统传输信号的峰均比,提出了一种相比同谱效率正交幅度调制(QAM)减少电平数的编码调制方案.通过选择合适的码率与映射规则,调制时无需在比特向量到星座点之间建立一一映射的关系;相比一般的调制系统,该系统减少了星座点数量,增大了星座点间距离,可因此获得更低的陡降门限和峰均比.同时,对该系统的若干设计准则进行了分析,并根据相关准则设计了一种代替传统64QAM调制的新型星座.仿真结果显示,该方案误码率性能可超过传统采用64QAM的比特交织编码调制系统.A new coded modulation scheme is proposed using fewer constellation points than normal quadrature amplitude modulation（QAM）.With properly designed code rate and labeling strategy,it is not necessary to map one to one from bit vectors to channel symbols.Iterative decoding and demodulation of the new scheme could obtain earlier turbo cliff compared with the coded modulation system with normal QAM constellation.As an example,a new constellation is constructed to replace the commonly used 64-QAM based on the design rules of such systems.Experiments show the effectiveness of the new scheme.

关 键 词：映射规则 编码调制 软解调 比特交织编码调制 

分 类 号：TN911.22[电子电信—通信与信息系统]