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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。
The space-time trellis code in wireless laser communication is discussed. At first, the encoder with 4 PPM space-time trellis codes with two transmitting antennas is designed, and its design principle and codec method are introduced. Secondly, the channel capacity of multi-input multi-output atmospheric optical channel is analyzed theoretically and finally Monte Carlo algorithm simulates the optical channel capacity and bit error rate. The results show that free space optical communication based on space-time trellis codes can reduce the impact of flicker effect on the bit error rate in atmospheric optical communication. When the number of transmit antennas is fixed, the system error rate increases with the number of receiving antennas And decreases; when the number of transmitting and receiving antennas is variable, the system channel capacity increases as the number of transmitting and receiving antennas increases.