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中文摘要：
由于OFDM调制技术能有效抵御大气散射效应,提出了频带FSO-OFDM传输的系统方案。在建立大气散射信道模型之后,推导了由散射造成的光强衰减系数及光强起伏方差和系统误符号率（SER）间的关系。以雾天和雨天为例,通过仿真实验验证了其正确性。结果表明：毛毛雨、广延雨和雷暴雨散射造成的光强起伏方差分别为2.4×10-2、3.044 1×10-4和8.776 2×10-5。当误符号率Pe=10-5、子载波N=32时,相对于毛毛雨,广延雨天和雷暴雨天的误符号率分别降低了12 dB、15 dB。虽然平流雾较辐射雾散射造成的光强衰减大,但它们的光强起伏方差均较小。当误符号率Pe=10-3,子载波N=32时,相对于平流雾,辐射雾的误符号率降低了10 dB。因此,在散射信道中系统误符号率主要取决于散射造成的光强起伏方差,其次取决于散射造成的光强度衰减系数。
英文摘要：
Since orthogonal frequency division multiplexing（OFDM） could combat scattering effect efficiently,the free space optical orthogonal frequency division multiplexing communication（FSO-OFDM） was proposed.Firstly,the atmospheric scattering channel model was established.Then,the relation of the light intensity attenuation coefficient and the variance of light fluctuation with the symbol error rate（SER） was derived.At last,the fog-weather and rain-weather channels were taken as example to verify its correctness.The results show that the variances of light intensity of drizzle,widespread and thunderstorm are 2.4×10-2,3.004 1×10-4 and 8.776 2×10-5 respectively.When the SER is 10-5 and the subcarrier number is 32,compared to drizzle,the SERs under widespread and thunderstorm are reduced by 12 dB,15 dB respectively.The light intensity attenuation of advection fog is bigger than that of radiation fog,and the variances of light intensity of advection fog and radiation fog are both very small.When the SER is 10-3 and the subcarrier number is 32,compared to advection fog,the SER under radiation fog is reduced by 10 dB.Thus,the FSO-OFDM system performance in scattering channel primarily depends on the variance of light intensity fluctuation,secondly depends on light intensity attenuation coefficient,both of which caused by scattering.
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