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短波信道上常见的多径传播易引起严重的码间干扰,必须采取有效的信道均衡技术予以克服,同时还要估计信道在训练周期内的随机波动。采用信道线性内插估计技术,将信道冲击响应(CIR)建模为线性时变函数,在分布于数据符号两端的导频符号辅助下进行信道估计。随后结合传统块均衡技术快速恢复原始发送数据。仿真结果显示该信道估计方法信道跟踪性能较好,系统整体误码率性能适中,复杂度较低。
Common multipath propagation on shortwave channels can easily cause serious intersymbol interference and must be overcome by effective channel equalization techniques. At the same time, it is also necessary to estimate the random fluctuation of channels during the training cycle. The channel impulse response (CIR) is modeled as a linear time-varying function using the channel linear interpolation estimation technique, and channel estimation is performed with the assistance of pilot symbols distributed at both ends of the data symbol. Then with the traditional block equalization technology to quickly restore the original sent data. The simulation results show that the channel estimation method has good channel tracking performance, the system overall error rate performance is moderate and the complexity is low.