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Watterson模型是性能良好的短波窄带信号模型。搭建了基于训练序列的短波Watterson信道的Simulink仿真模型,其具有能全面考虑短波多径时延、多普勒扩展、多径增益等特性的优点。采用1 800 Hz的单音信号作为输入,通过分析输出端NLMS滤波估计器的系数和归一化均方误差的变化,验证了模型的可行性。仿真结果表明,该方法能适应短波信道的时变特性,实时估计效果好。
Watterson model is a good short-wave narrowband signal model. The Simulink simulation model of short-wave Watterson channel based on training sequence is built, which has the advantages of fully considering the short-wave multipath delay, Doppler spread, multipath gain and so on. The signal of 1 800 Hz was used as input. The feasibility of the model was verified by analyzing the coefficients of NLMS filter estimator and the normalized mean square error. The simulation results show that this method can adapt to the time-varying characteristics of short-wave channel, and real-time estimation is effective.