GMSK信号的非相干解调技术研究  

Study of demodulation with noninterference about GMSK signal

作　　者：陈旗[1] 杨允军[1] 宋士琼[1] 

机构地区：[1]海军工程大学电子工程学院指挥自动化系,湖北武汉430033

出　　处：《航天电子对抗》2007年第1期58-61,共4页Aerospace Electronic Warfare

摘　　要：介绍了GMSK信号的两种非相干解调——1bit差分解调和改进型的Viterbi算法解调。通过计算机仿真对这两种非相干解调算法进行了研究,最后在相互之间进行了解调性能仿真比较。仿真结果表明,1bit差分解调算法完全能够实现对GMSK信号的正确解调,改进型的Viterbi解调算法在解调过程中用MSK信号的相位路径进行高斯滤波后作为参考路径,并选取与接收信号的相位路径的Euclidean距离最小的作为解调路径,取得了良好的解调效果。在同等误码率要求下,改进的Viterbi算法比1bit差分解调性能具有更高的SNR优势。Two ways of demodulation about the GMSK with noninterference,difference demodulation 1 bit and mended Viterbi arithmetic demodulation,are introduced, The capabilities of the two demodulation are compared through computer simulation. The difference demodulation of 1 bit could achieve the demodulation about the GMSK. In the course of the mended Viterbi arithmetic demodulation, the phasic path of MSK filtered through Gauss filter is turned into referential path,and the path which Euclidean distance with received signal is shortest is turned into demodulation path. The perfect demodulation effect is achieved. The mended Viterbi arithmetic demodulation has more predominance about SNR than the difference demodulation of 1 bit.

关 键 词：GMSK信号 非相干解调1bit差分解调 改进型的Viterbi算法解调 

分 类 号：TN763[电子电信—电路与系统]