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建立了空间调制无线光通信的光强信道模型,并给出了空间信号必须满足的两个基本约束条件。通过定义于二维空间的正交基函数建立了矢量信号空间,并定义了三个衡量空间信号设计方案性能的指标,即误符号率,频带利用效率和功率效率等。参照传统时域信号设计方案,提出了三种空间调制信号具体设计方案,并从带宽效率和功率效率两性能上进行了比较,结果表明正交幅度调制(QAM)具有带宽效率高、功率效率低的特点,而且采用的信号点越多其带宽效率就越高,另外其空间信号图案还具有圆对称性,因此非常适合在空间带宽有限的远距离无线光通信中使用。
The optical channel model of space-modulated wireless optical communication is established, and two basic constraints that the spatial signal must satisfy are given. The vector signal space is established by orthogonal basis functions defined in two-dimensional space, and three indexes that measure the performance of the spatial signal design scheme are defined, that is, error symbol rate, frequency band utilization efficiency and power efficiency. According to the design scheme of traditional time-domain signal, three schemes of spatial modulation signal design are proposed and compared with the performance of bandwidth efficiency and power efficiency. The results show that quadrature amplitude modulation (QAM) has the advantages of high bandwidth efficiency and low power efficiency The more signal points are used, the higher the bandwidth efficiency is. In addition, the spatial signal pattern also has circular symmetry, so it is suitable for use in long-distance wireless optical communications with limited space bandwidth.