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采用通信理论建立了成像光通信的时空连续三维高斯信道模型,分析了信道容量。结果表明利用光的空间特性可以增加信道容量,其效果取决于系统的空间带宽积。提出了一个成像光通信的收发系统方案,给出了基本的系统设计条件,并分析了系统性能。进行了30 m距离的点阵图传输实验,结果验证了系统的设计要求和性能。给出了一种适合成像光通信的信号相关探测接收方法,它要求用于通信的点阵图像需按照二维空间正交码来构造。为了提高相关接收时的信号处理速度,还可考虑采用光学信息并行处理器,例如非相干多通道相关器,并对该相关器的工作过程做了描述。
The space-time continuous three-dimensional Gaussian channel model of imaging optical communication is established by using communication theory, and the channel capacity is analyzed. The results show that the use of spatial characteristics of light can increase the channel capacity, the effect depends on the system of space-bandwidth product. Proposed an imaging optical communication transceiver system program, given the basic system design conditions, and analyzed the system performance. A bitmap transmission experiment was conducted at a distance of 30 m. The results verified the design requirements and performance of the system. A signal correlation detection and reception method suitable for imaging optical communication is given, which requires that the dot matrix image used for communication should be constructed according to the orthogonal code of two-dimensional space. In order to improve the signal processing speed of receiving, optical information parallel processors, such as non-coherent multi-channel correlators, may also be considered, and the working process of the correlator is described.