本文分析了DWDM系统中xpm和FWM效应随信道间距变化的关系，并提出了大容量长距离DWDM系统仿真的解决方案。
The relation between channel spacing and effect of XPM and FWM in DWDM system was analyzed, and a new solution for simulation of high speed and long haul DWDM system was derived.
作为实例，给出了高斯信道和衰落信道上的一些TCM信号序列的自由空间距离的计算结果。
As some examples, the results of some TCM signal sequence on additive Gaussian white noise (AWGN) channel and fading channels have been presented.
增大天线间距能够提高信道容量，但并不能一直提高信道容量。K系数的增大，信道容量将会降低。
The results also show that the channel capacity decreasinglyincreases with the antenna spacing and decreases with the coefficient K.
雷达接收机信道对于信号检测是最佳系统，当用其传输遥测信号时，由于信道噪声的影响，使遥测信号码间距发生变化，从而影响遥测信息传输精度。
But change of telemetering signal interval caused by channel noise will affect transmission accuracy of telemetering information when it is used to transmit telemetering signals.
雷达接收机信道对于信号检测是最佳系统，当用其传输遥测信号时，由于信道噪声的影响，使遥测信号码间距发生变化，从而影响遥测信息传输精度。
But change of telemetering signal interval caused by channel noise will affect transmission accuracy of telemetering information when it is used to transmit telemetering signals.
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