多调制指数CPM信号的新分解方式及其准相干解调  

Decomposition and quasi-coherent demodulation of Multi-h CPM signal

作　　者：刘蒙蒙 王晓颖 余忠洋[1] 丁兴文 常洪雨 白宝明[1] LIU Mengmeng;WANG Xiaoying;YU Zhongyang;DING Xingwen;CHANG Hongyu;BAI Baoming(State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China;Beijing Telemetry Technology Research Institute, Beijing 100094, China)

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]北京遥测技术研究所,北京100094

出　　处：《系统工程与电子技术》2020年第11期2614-2619,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61771364,61701368);空间测控通信技术联合创新实验室基金(201704A)资助课题。

摘　　要：针对卫星通信等资源受限的无线通信系统,研究了多调制指数连续相位调制(Multi-h continuous phase modulation,Multi-h CPM)信号的调制与解调相关问题。首先提出了一种新的分解方式来简化Multi-h CPM信号的调制过程,并给出了相应的周期性状态网格图。然后根据新的分解方式设计了一种适用于Multi-h CPM信号的导频辅助准相干解调算法,并从功率谱和误码性能两方面对所设计的Multi-h CPM信号和单调制指数CPM(Single-h CPM)信号进行了评估与比较。仿真结果表明:无论采用何种频率脉冲,Multi-h CPM信号都要比Single-h CPM信号具有更加光滑的功率谱曲线;仅两个导频符号辅助下,未编码Multi-h CPM系统较未编码Single-h CPM系统有将近2 dB的性能增益,且在低信噪比下,编码Multi-h CPM系统性能要比编码Single-h CPM系统好0.1~0.25 dB。Considering resource-limited wireless communications such as satellite communications,the relevant problems of modulation and demodulation of multi-h continuous phase modulation(multi-h CPM)signals are studied.A new way of decomposition is first designed to simplify the modulation process of the multi-h CPM signals,followed by a periodic state trellis.Then,a pilot-aided quasi-coherent demodulation algorithm is proposed to detect the multi-h CPM signals according to the designed decomposition.Moreover,the multi-h CPM signals and the single-h CPM signals are evaluated and compared from the two aspects of power spectrum and bit error performance.Simulation results show that,no matter what frequency pulse is used,the multi-h CPM signals have smoother power spectrum curves than the single-h CPM signals;only with the assistance of two pilot symbols,the performance gain of the uncoded multi-h CPM system is nearly 2 dB compared with that of the uncoded single-h CPM system,and the coded multi-h CPM system can achieve performance gain of 0.1 dB to 0.25 dB more than the coded single-h CPM system at low signal-to-noise ratios(SNRs).

关 键 词：单调制指数连续相位调制 多调制指数连续相位调制 导频辅助 卫星通信 

分 类 号：TN911.23[电子电信—通信与信息系统]