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研究了移动信道中的最大多普勒频移估计技术。分析了一种基于循环前缀的多普勒频移估计算法,该算法通过计算正交频分复用(OFDM)符号已有的循环前缀的相关函数来获得最大多普勒频移。采用广义平稳非相关散射下的多径时变瑞利信道模型,对各个算法进行了仿真试验,比较了各个算法的性能。仿真结果表明,利用多普勒分集技术,可以显著降低误码率,提高系统在移动环境下的性能。
The maximum Doppler shift estimation in mobile channel is studied. A Doppler shift estimation algorithm based on cyclic prefix is analyzed. The algorithm obtains the maximum Doppler shift by calculating the correlation function of existing cyclic prefix of Orthogonal Frequency Division Multiplexing (OFDM) symbol. The multi-path time-varying Rayleigh channel model under generalized stationary non-correlated scattering is used to simulate each algorithm and the performance of each algorithm is compared. The simulation results show that the use of Doppler diversity technology can significantly reduce the bit error rate and improve the system performance in the mobile environment.