关键词: 多普勒频移, 误码率, simulink, Fitz算法

Abstract: Doppler shift caused by high-speed train increases error rate of the wireless communication system. The classic Fitz shift estimation algorithm hasn’t been adapted to the high-speed environment where frequency offset is large and has large variation rate. A Doppler frequency shift estimation algorithm based on the in-vehicle information is proposed. First when the train drives in different conditions, it derives the formula of Doppler frequency offset, then estimates the Doppler frequency offset through obtaining the real-time vehicle information, and then combines with the improved Fitz shift estimation algorithm to accurate estimation. Simulation model of error rate for wireless channel transmission is constructed, by using the simulink toolbox of matlab to simulate the error rate. The results show that the proposed estimation algorithm can estimate Doppler frequency offset that caused by high-speed train in real-time, and indirectly increases range of the estimation for improved Fitz shift estimation algorithm.

Key words: Doppler frequency shift, error rate, simulink, Fitz algorithm