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提出了一种新的多进制无线光通信技术,其基本原理是用一组相互易区分的空间图案代替传统无线通信中的会聚光斑传递信息.分析了该通信方案的信道容量,结果表明无线光通信系统存在未被利用的空间自由度,其大小与系统收发孔径和光波波长有关,与光场空间分布无关.通过合理设置系统的结构参数和设计信号图案,可以利用无线光通信系统的空间自由度增加信道容量.提出了一种实现该技术的光电系统方案,其关键组成部分为空间光调制器和图象相关器.详细描述了信号处理过程,具体包括二维相关处理、比较判决和进制转换三部分.分析了该方案的误码性能,得到了平均误码率的估算公式,分析得到了可降低误码率的信号设计基本规则.最后用一个透镜阵列处理器通过实验验证了该通信方案.
A new multi-band wireless optical communication technology is proposed, whose basic principle is to use a set of mutually distinguishable spatial patterns to replace the converging spot in the traditional wireless communication to transmit information. The channel capacity of the communication scheme is analyzed. The results show that wireless The optical communication system has unused spatial freedom, its size is related to the system transmitting and receiving aperture and the wavelength of the optical wave, and has nothing to do with the spatial distribution of the optical field. By setting the system structural parameters and designing the signal pattern properly, the space of the wireless optical communication system can be utilized The degree of freedom increases the channel capacity.This paper proposes a photoelectric system scheme to realize the technology, the key components of which are spatial light modulator and image correlator, and the signal processing process is described in detail, including two-dimensional correlation processing, comparative decision and The conversion of the binary system into three parts, the error performance of the scheme is analyzed, the average error rate estimation formula is obtained, and the basic rules of the signal design that can reduce the bit error rate are analyzed.At last, a lens array processor is used to verify The communication program.