摘要
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 narrowband-signal model.A Simulink simulation model of HF Watterson channel based on training sequence is constructed,which can incorporate HF characters well,including multipath delay,Doppler spread,multipath gain and so on.Input signal with 1800Hz tone signal as the input signal,and by analyzing tap coefficient changes of NLMS filter and NMSE changes of the output,the feasibility of the model is proved.The simulation results indicate that this method is adaptable to time-varying HF channel and has a good performance in real-time estimation.
出处
《通信技术》
2011年第4期59-61,共3页
Communications Technology
