混合FSO/RF系统自动切换条件的研究  

Research on automatic switch conditions for hybird FSO/RF system

作　　者：舒芳[1] 敖发良[1] 廖新鼎[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2008年第1期1-4,共4页Journal of Guilin University of Electronic Technology

基　　金：军事预研资助项目(B200109)

摘　　要：研究混合FSO/RF通信系统链路双切换理论,主要针对自由空间光通信受天气因素影响严重的问题。通过分析得出信号的码元速率与带宽成正比关系,降低码元速率即可降低噪声,从而缓解噪声的影响,提高系统信噪比;在能见度较小的天气条件下,低速的自由空间光通信系统性能仍达不到门限值,系统才将切换至射频链路。此理论使实际通信中能够更加充分的利用FSO及RF的优势进行互补,提高系统信噪比的同时又减少了信道切换的次数。In view of the influence by weather factors, this paper presented a double switching theory for hybird FSO/RF. It is found that the rate of the signal is directly related to the band width. The noise drops as the rate drops and as such the influence of the noise is alleviated and the SNR is thus increased. If the performance of low speed FSO communications system still cannot achieve the threshold value under the small visibility weather condition, the system will be switched to the radio frequency link. The theory made full use of FSO and RF link. It can provide better SNR and reduce the workload of channel switching.

关 键 词：自由空间光通信 射频通信 大气信道 自动切换 

分 类 号：TN929.1[电子电信—通信与信息系统]