改善CE-OFDM相位模糊的块编码联合过采样方法  

Block coding joint oversampling method for mitigating CE-OFDM phase ambiguity

作　　者：唐新丰 李洪 王星来 夏国江 韩明 TANG Xinfeng;LI Hong;WANG Xinglai;XIA Guogjiang;HAN Ming(Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China;China Aerospace Science and Technology Corporation,Beijing 100048,China)

机构地区：[1]北京宇航系统工程研究所,北京100076 [2]中国航天科技集团有限公司,北京100048

出　　处：《遥测遥控》2019年第5期16-21,共6页Journal of Telemetry,Tracking and Command

基　　金：国防预研项目

摘　　要：针对调制指数较大时,相位连续的正交子载波数较少的恒包络正交频分复用CE-OFDM(Constant Envelop Orthogonal Frequency Division Multiplexing)信号在相位解调过程中频繁出现相位模糊的问题,提出利用块编码联合基于在OFDM帧结构中插零实现过采样的方法改善该问题。在此基础上,利用模拟退火-粒子群优化SA-PSO(Simulate Anneal Particle Swram Optimization)算法寻找最优编码序列。实验结果表明,相比于单一的过采样方法,所提方法在改善相位模糊效果相同时,能够具有更低的计算复杂度。在采样率相同时,联合方法具有更好的改善效果。In this paper,we consider the problem that constant envelope orthogonal frequency division multiplexing(CE-OFDM)signals with continuous phase and fewer orthogonal subcarriers usually suffer from phase ambiguity in phase demodulation when the modulation index is large.A method that block coding joint oversampling based on zero insertion in OFDM frame structure is proposed.On this basis,simulate anneal particle swarm optimization(SA-PSO)algorithm is used to find the optimal coding sequence.It is shown that proposed scheme can obtain lower computational complexity than sampling scheme when the same effort is made,and can provide better efford than sampling scheme in mitigating CE-OFDM phase ambiguity when the sampling rate is the same.

关 键 词：CE-OFDM 相位模糊 块编码 粒子群优化 

分 类 号：TN911.72[电子电信—通信与信息系统]