短波信道对OFDM信号的影响研究

短波信道的多径效应，频率偏移，非线性干扰等因素会降低短波OFDM通信的性能。文章通过理论推导，分析了短波信道对OFDM技术的影响。通过计算机仿真实际的短波通信实验，验证了分析的结果。

Study on the Effect of HF Channel for OFDM Signals

High-frequency(HF) communication plays an important role in military communications,because of simple equipment,low-cost good flexibility and non-destroyed performance.Nowadays,high speed,intelligentize and cyberization are the development direction of HF communication.Orthogonal frequency division multiplexing(OFDM) technique adapts for the development of HF communication.Because it has the character of high bandwidth efficiency,high ability of against multipath and high bandwidth spread ability.But OFDM system has the sensitivity to frequency offset,and the difference of frequency between transmitter and receiver and the Doppler shifts of channel are ubiquitous in the HF communication.The multipath,frequency offset,and nonlinear disturbance in the HF channel will deteriorate the OFDM communication performance.The effect of HF channel for OFDM signals is analyzed by theory demonstrating.The analysis result is validated based on the Computer simulations and HF OFDM communication experiment.