基于信道线性内插估计的短波块均衡

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。

HF Channel Block Equalization based on Linear Interpolated Channel Estimation

The HF channels are always affected by random multipath phenomena, this could result in serious impairment on the received stream by time-variant inter-symbol interference （ISI）. Equalization is necessary to combating the multipath phenomena and estimating the random fluctuations of the channel within the short training periods. Thus with linear interpolated channel estimation technology, the channel impulse response （CIR） is modeled as the linear function of time variable k. With the help of training sequence located at the both ends of data symbol, the time-varying CIR could be obtained by linear interpolation. Based on the estimated CIR, the data symbols subject to ISI could be rapidly recovered by block equalization. Simulation results indicate that the proposed method is fairly good in tracking the time-varying channel, and also of moderate BER performance and low complexity.