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针对时变多径短波信道提出一种基于差分检测Turbo乘积编码正交频分复用的宽带短波调制解调器的设计方法,并且研究了短波信道带内残存干扰对调制解调器性能的影响。结果表明,用于调制解调器设计的频率等增益分集对带内残存干扰具有白化作用,白化后的带内残存干扰对调制解调器性能的影响和加性高斯噪声类似,系统设计中可将带内残存干扰和高斯噪声等同对待,简化宽带短波系统的设计。
Aiming at the time-varying multipath shortwave channel, a design method of wideband shortwave modem based on differential detection of Turbo product codes Orthogonal Frequency Division Multiplexing (OFDM) is proposed. The effect of residual interference in shortwave channel on modem performance is also studied. The results show that the equal-gain diversity diversity used in modem design has a whitening effect on in-band residual interference. The in-band residual interference after whitening has similar effect on modem performance as additive Gaussian noise. In-system residual interference and Gaussian noise equivalent treatment, simplifying the design of broadband shortwave system.