编码CPM的迭代接收  

Iterative Receiving for Coded CPM

作　　者：李小强[1] 王呈贵[2] 陈宇[1] 

机构地区：[1]解放军理工大学通信工程学院研究生3队,江苏南京210007 [2]解放军理工大学通信工程学院无线通信系

出　　处：《军事通信技术》2007年第1期11-14,共4页Journal of Military Communications Technology

摘　　要：文中介绍了一种把编码和调制相结合的编码 CPM 系统;研究了 CPM 最佳接收机的结构,推导出了 AWGN 信道条件下 CPM 的转移概率密度函数,进而把传统最大后验概率(APP)算法——BCJR 算法应用于CPM,实现了编码 CPM 的迭代接收;在不同的交织方式下对该系统进行了仿真,并比较了在不同交织方式下的抗噪性能。仿真结果显示:采用迭代接收的编码 CPM 系统具有和串行级联卷积码(SCCC)类似的抗噪性能,同时还具有 CPM 的诸多优点,如较高的带宽利用率,恒包络特性等;采用 S 伪随机交织器的系统具有较好的抗噪性能。A coded CPM with iterative receiving was investigated. After researching the optimal receiver for CPM, a joint PDF was obtained for CPM on an AWGN channel. Then a posteriori probability （APP） algorithm for CPM was developed based on the classic APP algorithm for channel codes BCJR algorithm, and the iterative receiving for coded CPM achieved. The BER performance of coded CPM system was compared with some kinds of interleavers. Simulation results show that the coded CPM system possesses the similar BER performance as SCCC system, and it also has many merits of CPM, such as higher bandwidth efficiency, constant envelope characteristic, and so on. Furthermore the coded CPM system with S pseudorandom interleaver has relatively better BER performance.

关 键 词：串行级联卷积码 连续相位调制 迭代译码 软输入软输出 

分 类 号：TN911.23[电子电信—通信与信息系统]