大气无线光通信调制方式性能分析  

Performance Analysis of Modulation Scheme for Atmospheric Optical Wireless Communications

作　　者：程刚[1] 王红星[1] 吴龙刚[1] 许志超[1] 孙晓明[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《中国电子科学研究院学报》2007年第5期485-489,共5页Journal of China Academy of Electronics and Information Technology

摘　　要：在对三种典型大气无线光通信调制方式——OOK、PPM和DPIM的调制结构进行分析的基础上,结合大气无线光信道特点,分析比较了这三种调制方式的带宽需求、传输容量、功率需求和差错性能。理论分析与仿真结果表明,OOK方式实现简单,不需要符号同步,带宽需求最小,但功率利用率太低;PPM方式大大提高了功率利用率,但带宽利用率最低,而且需要符号同步;DPIM相比于OOK具有更高的功率利用率,相比于PPM具有更高的带宽利用率,而且不需要符号同步,应用于无线光通信系统具有显著的优势。In this paper, the modulation structures, bandwidth requirement, transmission capacity, power requirement and packet error rate performance of the typical modulation schemes OOK, PPM and DPIM for atmospheric optical wireless communications are analyzed, combined with the characteristic of the atmospheric optical wireless channel. Theoretical analysis and simulation results show that OOK is the simplest scheme but unable to provide high power efficiency; PPM offers the highest average power efficiency, but the bandwidth efficiency of PPM is the lowest and PPM requires symbol synchronization which makes the realization of PPM more difficult; DPIM offers higher average power efficiency compared with OOK, and higher bandwidth efficiency compared with PPM and, moreover, DPIM requires no symbol synchronization. Hence, DPIM is superior in optical wireless communications.

关 键 词：无线光通信 调制方式 OOK PPM DPIM 

分 类 号：TN911.3[电子电信—通信与信息系统]