低复杂度SOQPSK-TG相干解调算法  

Reduced-complexity Coherent Demodulation Algorithm for SOQPSK-TG

作　　者：王乐 齐建中 宋鹏 WANG Le;QI Jianzhong;SONG Peng(Electronic Information Engineering College,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学电子信息工程学院,北京100144

出　　处：《无线电工程》2018年第9期723-726,共4页Radio Engineering

基　　金：国家自然科学基金资助项目(NSFC 91438116);上海航天科技创新基金资助项目(SAST2015089)

摘　　要：SOQPSK是连续相位调制(CPM)中的一类调制方式,具有良好的恒包络特性和频谱利用率高的特点,广泛用于无线测控和无线通信系统当中。由于符号间具有记忆性,解调时需要采用最大似然序列检测(MLSD),对于部分响应的SOQPSK-TG信号,全状态的最大似然检测复杂度较高。设计了基于脉冲截断的低复杂度相干解调算法,包括MLSD检测以及载波和符号联合同步2个部分。仿真结果表明,该相干解调算法约性能和MLSD检测限相比存在约为0.2 d B损耗,接近MLSD检测限。SOQPSK is one kind modulation of continuous phase modulation（CPM） with the advantages of constant envelop and high efficient spectrum application. It has been widely used in wireless communication systems. Due to the memory between the transmitted symbols,the maximum-likelihood sequence detection（MLSD） is applied to the demodulation of CPM.The optimal detection for partial-response SOQPSK-TG will be implemented with high complexity.This paper presents a reduced-complexity demodulator based on the MLSD and joint carrier and symbol timing recovery. The simulation results demonstrate that the performance of the proposed demodulator with 0.2 d B loss is very close to the MLSD theoretical bound.

关 键 词：连续相位调制 脉冲截断 Viterbi检测 载波同步 符号同步 

分 类 号：TN939[电子电信—信号与信息处理]