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中文摘要：
自由空间光通信（FSO）的信道是随机的，会受到灰尘、雨滴、雾等粒子散射的影响，正交频分复用（OFDM）调制方式可以很好地抵御大气散射的影响，但简单地将OFDM与FSO结合的系统复杂度较高。为了降低传统FSO-OFDM系统的复杂度及改善系统性能，借鉴Alamouti空时编码理念，设计了一种新的时频码。依据大气信道的特点，建立了信道模型。在介绍了系统模型之后，详细地陈述了时频码的编译码方法，分析了系统误码率（BER）与信道特性关系。最后通过Monte Carlo仿真实验进一步证明了该时频码的有效性。结果表明，以雨天为例，采用该时频编码不仅可以降低FSO-OFDM系统的复杂度，而且误码性能得到了显著的提高。
英文摘要：
The channel of free space optical communication （FSO） has to experience varied channel effects such as dust, rain, fog etc. The system which simple combined FSO with orthogonal frequency devision muitiplexing （OFDM） is more complicated although OFDM can resist the influence of scatter. We proposed a new time frequency code to solve the shortcoming of the traditional FSO-OFDM system. We established the channel model according to the characters of atmospheric channel. And particular described the compilation method of time frequency code and analyzed the relation between the system＇s bit error rate （BER） and the channel characteristic after introducing the FSO-OFDM system model. At last, this scheme is confirmed by Monte Carlo approach. It is shown that this method not only can simplify the system but also can improve the error rate performance of the system effectively.
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