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为了降低湍流对大气无线光通信的影响,提高无线光通信系统性能,提出了一种4发射天线、4接收天线的无线光多发射多接收系统模型,针对该模型设计了一种正交空时分组码(OSTBC)编译方法,并对该码的平均误比特性能进行了仿真分析。结果表明,该方案具有很大的分集优势,可获得的最大分集度为16,达到了4发4收系统所能获得的最大空间分集增益,同时该编码方法与传统的Alamouti方案一样能实现最大传输速率。通过对译码算法进行简单修改,OSTBC编译方法也可以应用在接收天线数目为1,2或3个的多光束发射和接收系统中。
In order to reduce the influence of turbulence on atmospheric wireless optical communication and improve the performance of wireless optical communication system, a 4-receive antenna and 4-receive wireless optical multiple transmit multiple reception system model is proposed. An orthogonal space-time (OSTBC) compilation method, and the average bit error rate of the code was simulated. The results show that this scheme has a great diversity advantage and the maximum available diversity is 16, which achieves the maximum spatial diversity gain of 4-ary and 4-ary systems. At the same time, this scheme can achieve the maximum of the traditional Alamouti scheme Transmission rate. By simply changing the decoding algorithm, the OSTBC compilation method can also be applied to a multi-beam transmitting and receiving system with one, two or three receiving antennas.