基于最佳采样点的GMSK相干接收算法  

GMSK coherent receiving algorithm based on optimal sampling point

作　　者：孙岩博 杜俊逸 肖磊 李根 SUN Yanbo;DU Junyi;XIAO Lei;LI Gen(The 10th Research Institute of China Electronics Technology Group Corporation,Chengdu 610036,China;School of Automation Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]中国电子科技集团公司第十研究所,四川成都610036 [2]电子科技大学自动化工程学院,四川成都611731

出　　处：《系统工程与电子技术》2024年第9期3239-3245,共7页Systems Engineering and Electronics

摘　　要：针对高斯滤波最小频移键控(Gaussian-filtered minimum shift keying,GMSK)相位连续性导致相位估计存在模糊度问题,提出一种基于最佳采样点的GMSK相干接收算法。发射端通过构造预编码方式对原始消息编码后调制,以实现符号间的相位解耦,接收端在码间串扰最小时刻实现最佳采样点抽取,将GMSK转变成类偏移四相相移键控(offset quadrature phase shift keying,OQPSK)调制,有效避免未知数据段对后续同步段引入模糊初相而导致多普勒相位和频率无法准确估计的问题,最后提出基于最佳采样点的GMSK相干解调算法,实现低复杂度的可靠接收。仿真结果表明,所提算法多普勒频率估计范围大且估计精度高,同时与最佳解调接收机相比,所提算法解调复杂度低且解调性能损失小。To solve this issue of phase estimation ambiguity induced by Gaussian-filtered minimum shift keying(GMSK)phase continuity,a GMSK coherent receiving algorithm based on optimal sampling point is proposed.For realizing the decoupling of symbols,a precoding method is constructed to encode original message to modulate and then the receiver samples at optimal time with minimal intersymbol interference to transform GMSK into offset quadrature phase shift keying(OQPSK),effectively avoiding this issue of Doppler frequency and phase inaccurate estimation induced by the introduction of initial phase ambiguity from previous unknown data.A coherent demodulator is built based on optimal sampling time to accomplish reliable receiving with low complexity.Simulation results indicate that the proposed method has a higher estimation range of Doppler frequency,while maintaining comparable estimation precision.Meanwhile,compared to optimal receiver,the proposed demodulation algorithm has very small complexity and comparable demodulation performance.

关 键 词：高斯滤波最小频移键控 最佳采样 多普勒相位估计 相干解调 

分 类 号：TP911[自动化与计算机技术]