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中文摘要：
讨论了无线激光通信中的空时网格码。首先设计了带有两副发射天线的4PPM-空时网格码的编码器,并介绍其设计原理和编译码方法,其次对多输入多输出大气光信道的信道容量进行了理论分析,最后通过蒙特卡洛算法对光信道容量和误码率进行仿真验证。结果表明：基于空时网格码的自由空间光通信能够减小闪烁效应对大气光通信中误码率的影响;当发射天线数目固定不变时,系统误码率随着接收天线数目的增加而减小;当收发天线数目可变时,系统信道容量随着收发天线数目的增加而增大。
英文摘要：
A space-time trellis codes based on free space optical communications（FSO） was presented.The 4-PPM space-time trellis encoder with two transmitting antennas was designed,and then the basic design principle and the coding algorithm were introduced.The multiple-input and multiple-output（MIMO） channel capacity was analyzed theoretically in the atmospheric optical channel.Finally,based on the Monte Carlo algorithm,optical channel capacity and bit error rate were simulated.The simulation results shows that space-time trellis codes based on FSO can reduce the atmospheric scintillation turbulence effects on bit error rate of atmospheric.When the number of transmit antennas is fixed,the bit error rate will decrease with the increasing number of receiving antenna;when the number of transmit antennas is not fixed,as the number of tranmit antennas increases,the channel capacity will increase.
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