Research On Diversity Technology In Ultraviolet Communication System

Ultraviolet (UV) in the ultraviolet region of UVC in the solar radiation is strongly absorbed by the ozone layer, and the amount of radiation in the vicinity of the sea surface is very small. Taking use of the atmospheric scattering to solar blind UV of200-300nm, non-line-of-sight (NLOS) communications can be performed. UV NLOS communications have the advantages of strong anti-interference ability, high confidentiality, which make it one of the hot research spot over the world. This paper introduces the diversity commonly widely used in microwave communication technology into the UV NLOS to study its impact on communication performance.The first chapter briefly introduces the development, the research achievements, the research status and the necessity of the research of UV communication both at home and abroad. And draw forth the research content of this article.The second chapter introduces the theoretical basis of UV NLOS and the diversity technology in microwave communication technology, and demonstrates the feasibility of using diversity technology in UV NLOS communication system.The third chapter describes the UV NLOS communication experimental platform. We first introduce the devices used in UV NLOS communication system briefly. Then we introduce the system working principle and the system performance in the aspects of hardware circuit and the FPGA design in detail.The forth chapter introduces the UV NLOS diversity reception communication system. We design the UV diversity data collecting platform, and carry out several experiments in different conditions. Then we do the data processing and analyzing. We proved the feasibility of diversity reception in UV NLOS communication system by the contrast of SNR. At last, we bring out an UV NLOS diversity reception system with EGC method, and achieve the correctness of send and receive data using this system.Finally, the fifth chapter reviews the whole paper, puts forward the UV NLOS communications research and development in the future.