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无线通信尤其是短波通信具有许多独特优点 ,如 :能远距离通信及移动通信 ,其设备简单、使用方便、机动灵活、成本低廉等 ,一直是一种重要的通信手段。但无线信道是一具有严重时变色散性的变参信道 ,时间衰落、多普勒频移及多径传输造成了信号在时、频、空三维空间中的严重扩展
Wireless communication, especially shortwave communication, has many unique advantages such as long distance communication and mobile communication, simple and convenient equipment, flexible operation and low cost, which has always been an important means of communication. However, the wireless channel is a variant channel with severe time-varying chromatic dispersion. Time fading, Doppler shift and multipath transmission cause a serious extension of the signal in the three-dimensional space of time, frequency and space