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垂直分层空时编码(V-BLAST)是一种将空间复用和空间分集相结合的技术,它具有极高的频谱利用效率和传输速率,因此将垂直分层空时编码技术应用于自由空间光通信。在研究了大气信道的特性之后,提出了一种基于垂直分层空时编码的自由空间光通信系统的信道模型。介绍了垂直分层空时编码的编码原理,并分析了该系统的信道容量。利用仿真实验比较了采用垂直分层空时编码前后系统信道容量及误码性能的变化。结果表明,当接收天线数大于或等于发送天线数时,系统的信道容量与发送天线数成正比例增长,误码性能被有效改善。说明该系统具有垂直分层空时编码所提供的信道容量和良好的误码性能,且能有效克服大气湍流所产生的闪烁效应。
Vertical Layered Space-Time Coding (V-BLAST) is a technique that combines spatial multiplexing and spatial diversity with high spectral efficiency and transmission rate. Therefore, the application of vertical layered space-time coding to free Space optical communication After studying the characteristics of atmospheric channel, a channel model of free space optical communication system based on vertical layered space-time coding is proposed. The coding principle of vertical layered space-time coding is introduced and the channel capacity of the system is analyzed. The simulation experiments are used to compare the changes of channel capacity and error performance before and after using vertical layered space-time coding. The results show that when the number of receiving antennas is greater than or equal to the number of transmitting antennas, the channel capacity of the system increases in proportion to the number of transmitting antennas and the error performance is effectively improved. It shows that the system has the channel capacity and good error performance provided by vertical layered space-time coding and can effectively overcome the flicker effect caused by atmospheric turbulence.