GMSK信号维特比解调算法研究及其在信道衰落下性能分析  

Research on Viterbi Demodulation Algorithm of GMSK Signal and its Performance Analysis under Channel Fading

作　　者：朱岩 Zhu Yan(China Airborne Missile Academy,Henan Luoyang 471009)

机构地区：[1]中国空空导弹研究院,河南洛阳471009

出　　处：《电子质量》2022年第3期6-12,共7页Electronics Quality

摘　　要：GMSK无线通信系统具有恒包络、滚降衰减快、带外抑制强、抗干扰能力高等优点,是一种高数据率、高频谱效率的通信体制。该文对基于最大似然检测原理的Viterbi解调算法进行研究,构建GMSK系统仿真模型,给出了GMSK解调方式中延迟差分解调算法和Viterbi解调算法的误码率性能对比。最后在几种典型信道衰落环境下对GMSK解调算法进行仿真,仿真结果表明,Viterbi解调算法可以显著提高系统增益,且具有较好的抗多径衰落和多普勒频偏的能力。GMSK wireless communication system has the advantages of constant envelope, fast roll-off attenuation, strong out-of-band suppression, and high anti-interference ability. It is a communication system with high data rate and high spectral efficiency. This paper studies the Viterbi demodulation algorithm based on the principle of maximum likelihood detection, builds a GMSK system simulation model, and gives the BER performance comparison between the delay differential demodulation algorithm and the Viterbi demodulation algorithm in the GMSK demodulation method. Finally, the GMSK demodulation algorithm is simulated under several typical channel fading environments. The simulation results show that the Viterbi demodulation algorithm can significantly improve the system gain, and has better resistance to multipath fading and Doppler frequency offset.

关 键 词：GMSK 最大似然检测 Viterbi解调 信道衰落 

分 类 号：TN763[电子电信—电路与系统]