基于Viterbi算法的GMSK信号解调性能分析与仿真  

Performance analysis and simulation of GMSK demodulation based on Viterbi algorithm

作　　者：曾佐祺[1] 李赞[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071

出　　处：《重庆邮电大学学报（自然科学版）》2008年第2期132-138,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(60672129);霍英东高等院校青年教师基金(101065);陕西省自然科学基金(2005F29)

摘　　要：高斯最小频移键控(GMSK)调制是一种相位连续的恒包络调制方式,具有带外辐射小、频谱利用率高的特点、在介绍GMSK信号的基本原理的基础上,通过信号状态的具体表示及Viterbi算法分支度量的计算,给出了基于Viterbi算法的GMSK信号解调方法和系统性能分析。仿真结果表明,在误码率同为10^(-3)的条件下,该方法较二比特差分解调可获得7dB的增益,并具有较好的抗噪声和抗多径性能。Gaussian minimum shift keying （GMSK） is a constant envelope modulation with continuous phase, and achieves good power-bandwidth efficiency. According to the basic principle of GMSK signal, the GMSK demodulation based on Viterbi algorithm and its performance analysis are presented by describing the signal state and the computation of the branch metric in trellis diagram. Simulation result indicates that the proposed algorithm possesses good performance of anti-noise and anti-multipath. And it can obtain 7 dB gains under the same condition of bit error rate of 10^-3 than that of the 2-bits differential demodulation.

关 键 词：高斯最小频移键控 最大似然检测 误码率 VITERBI算法 

分 类 号：TN919[电子电信—通信与信息系统]