Multi-h CPM的低复杂度非相干检测  

Reduced-complexity non-coherent detection for Multi-h CPM

作　　者：钟声[1] 谢顺钦 王世练[2] 杨春[1] 张健[1] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621900 [2]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《计算机工程与设计》2014年第4期1121-1126,共6页Computer Engineering and Design

基　　金：国家自然科学基金项目(10876103)

摘　　要：针对多指数连续相位调制(Multi-h CPM)载波相位恢复困难且实现复杂度高的难题,提出了一种基于PAM分解的Multi-h CPM信号的低复杂度非相干序列检测算法。利用PAM分解的近似形式,结合逐幸存处理技术,减少了匹配滤波器数和网格状态数同时引入的参考相位信号,实现了具有残留载波频偏和载波相位校正的非相干序列检测;通过计算和搜索接收信号所有可能调制指数序列所对应的分支度量信息,实现了调制指数的估计与同步。仿真结果表明,该算法的性能优于传统的单符号差分非相干检测,实现复杂度相对较低,当存在残留载波频偏时,检测性能也够保持稳健。To solve the difficulty and complexity of carrier phase recovery problem of Multi-h CPM, an algorithm of reduced- complexity non-coherent sequence detection for Multi-h CPM based on PAM decomposition is proposed. Non-coherent sequence detection of residual carrier frequency offset and carrier phase amendment is realized through the inductive reference phase signal, and the number of matched filters and trellis is reduced by means of PAM decomposition approximation form and per-survivor processing. Modulation index estimation and synchronization is realized by calculating and searching branch metrics according to possible modulation index sequence. Simulation analysis shows that, the performance of the proposed algorithm is better than traditional one-symbol differential detection and its implementation complexity is relatively low. When residual carrier frequency offset exists, its detection performance is also robust.

关 键 词：多指数连续相位调制 低复杂度 非相干序列检测 逐幸存处理 分支度量 

分 类 号：TN911.3[电子电信—通信与信息系统]