短波跳频FH/QDPSK系统信道自适应监测的研究(Ⅱ)

摘要

基于短波跳频FH/QDPSK系统的FFT解调，利用FFT解调的结果，提出了在瑞利衰落信道中对信道的BER进行实时自适应监测方法，该方法利用伪错监测及其非线性外推较好地解决了在较短的监测时间内获得较为精确的监测结果。模拟结果表明，采用伪错的非线性外推算法，其估值的最大绝对误差不超过0.28，最大相对误差不超过12.1%。%Based on the implements of FFT(Fast Fourier Transform)demodulator in FH/QDPSK system,making use of the data of FFT,this paper proposed a method of real-time adaptively measuring the Rayleigh fading channel's BER(Bit-Error-Rate).This method used the measured pseudo error rate and non-liner extrapolation algorithm,it could improve the measure accuracy of BER in a short measure period.The simulation result shows that,by making use of the detected pseudo error rate,the non-linear extraplolation algorithm can decrease the maximum absolute deviation of evaluation of HF channel's BER to 0.28,the maximum relative deviation of its to 12.1%.