网格编码CPM系统中基于联合网格的多调制指数样式设计研究  

Pattern Design of Multiple Indices in Trellis-Coded CPM System Based on Super Trellis

作　　者：刘贤[1] 刘爱军[1] 潘小飞[1] 郭道省[1] 王永刚[1] 潘克刚[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《信号处理》2013年第5期557-569,共13页Journal of Signal Processing

基　　金：十二五预研基金资助(基金号:41001090201)

摘　　要：当前网格编码多调制指数连续相位调制方案呈现出较好的功率和带宽性能,其代价是接收机复杂度较高。在该方案中,如果将多个调制指数设计成特定的样式进行循环,而不是普通的周期使用,如此导致编码的有效长度增加从而能够得到更好的性能。本文在网格码与连续相位编码构建联合网格状态的基础上,对连续相位调制的多个调制指数样式进行了设计。通过进一步分析可以发现:联合编码器的有效长度和最小错误事件的欧氏距离得到大幅度提高。仿真结果表明:码率为1/2和2/3的四进制与八进制两指数CPM方案,要比单指数CPM方案分别能够获得1.4dB和1.7dB的性能增益。Schemes of trellis coded multi-h continuous phase modulation （CPM） have been shown in the literature to have attractive power-bandwidth performance at the expense of increased receiver complexity. In these schemes, the format of multiple indices is made to be associated with the specific pattern and repeated rather than cyclically changed in time for successive symbol intervals, resulting in a longer effective length of the error event with better performance. In this paper, the pattern of multiple indices has been designed based on super trellis which is constructed by trellis encoder and continu- ous phase encoder. The effective length of the merged encoder and the Euclidean distance of the minimal error event have been increased greatly based on further analysis. Simulation results show that a scheme combining rate 1/2 and 2/3 trellis codes with 4-and 8-1eve/dual-h CPM is shown to achieve 1.4dB and 1.7dB performance gain respectively than the scheme with single-h.

关 键 词：网格编码 多调制指数连续相位调制 联合编码器 联合网格 

分 类 号：TN911.7[电子电信—通信与信息系统]