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针对存在多普勒效应的快时变信道,利用复指数基扩展模型进行信道估计,以期减少信道参数估计所需的数据量,给出最小二乘法(LS)拟合复指数基系数方法,分析速度对模型准确度的影响;对多径时变传输信道进行建模,产生多径之间相互独立、幅度服从瑞利分布、相位服从均匀分布的仿真信道数据,验证复指数扩展模型可以有效减少训练序列;对单载波移动通信系统进行建模,信号通过多径快时变信道传输,并受到AWGN噪声干扰,通过分析SNR与BER之间的关系证明信道估计模型的合理性.
Aiming at the fast time-varying channel with Doppler effect, the channel estimation is carried out by using the complex exponential base extension model in order to reduce the amount of data required for channel parameter estimation. The method of least squares (LS) fitting of complex exponential base coefficients is given Velocity on the accuracy of the model. The multi-path time-varying transmission channel is modeled to generate the simulated channel data with multipaths independent of each other, the amplitude following the Rayleigh distribution, and the phase obeying the uniform distribution. It is verified that the complex exponential expansion model can effectively reduce Training sequence. The single-carrier mobile communication system is modeled. The signal is transmitted through multipath fast time-varying channel and is disturbed by AWGN noise. The rationality of channel estimation model is proved by analyzing the relationship between SNR and BER.