关键词: 高斯最小频移键控, 干扰, 解调, 信号分离

Abstract: Global System for Mobile Communications for Railway （GSMR） communication system of highspeed railway is vulnerable to the interference of wireless signals of other types. In this paper, the authors analyzed and researched several GSMR interference signals and proposed a new kind of signal separation algorithm based on the multiframe statistical spectrum. The idea of the algorithm was that the interference signal was divided into multiple frames and accumulated to statistical spectrum. If the number of frames was sufficient, its spectral parameter tended to be a constant. The experimental results show that the algorithm can quickly separate the original and interference signals in the case of known original signal spectrum, its effect and versatility is better, and the complexity of the algorithm is less than the traditional method.

Key words: Gaussian Minimum frequencyShift Keying （GMSK）, interference, demodulation, signal separation