多进制GMSK频谱分析及解调算法

Spectrum Analysis and Demodulation Algorithm of M-ary GMSK

多进制GMSK具有较大的频谱效率优势,对提高通信的效能有十分重要的意义。首先在二进制GMSK信号频谱的基础上,对多进制GMSK信号的频谱进行简要介绍,并对其进行比较,其次借鉴二进制GMSK信号的产生和解调思路,研究了多进制GMSK的产生算法及解调方式,并提出了对多进制GMSK信号的准最佳最大似然比解调算法,并对该算法进行仿真,结果发现该算法能够取得较好的误码性能。

M-ary GMSK has a large advantage in spectrum efficiency, which is very important for improving the commumcahon efficiency.Based on the signal spectrum of binary GMSK,the signal spectrum of M-ary GMSK is introduced and compared with binary GMSK,the generation algorithm of M-ary GMSK and demodulation methods are studied with the help of binary algorithm.A suboptimal maximum likelihood ratio demodulation method for M-ary GMSK is proposed.The simulation results show that the performance of this method has good performance in BER.