中文摘要：

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。

英文摘要：

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.