无线光PPM+PWM的性能分析  

Performance Analysis of Optical Wireless PPM+PWM

作　　者：李龙[1] 樊养余[1] 白勃[1] 

机构地区：[1]西北工业大学信号处理与无线光通信研究所,西安陕西710072

出　　处：《计算机仿真》2008年第12期180-183,211,共5页Computer Simulation

基　　金：国家重点实验室基金(9140C5301010701)

摘　　要：为了解决无线光通信中常用的调制方式开关键控(On-OffKeying,OOK)误比特率高,脉冲位置调制单位传信率低的问题,提出了一种新的调制方式--脉冲宽度位置调制技术。详细分析了PPM+PWM调制技术的单位传信率和误比特率,用Matlab软件首次成功实现了调制方式的编译码,并在在相干和非相干技术检测下,对采用调制方式的系统进行了仿真。分析和仿真结果表明,PPM+PWM是一种单位传信率优于PPM,误比特率小于OOK的调制技术。For the high BER of On -Off Keying（OOK） and low information transmission rate of Pulse Position Modulation（PPM） in the optical wireless communication modulations presently, a new modulation, Pulse -Position -Width Modulation（ PPM ＋ PWM）, is proposed in this paper. The unit information transmitting rate and packet error rate of PPM ＋ PWM are analyzed in detail. The coding and decoding of this modulation system on the Platform of Matlab are realized successfully for the first time. The system that introduces this modulation technique is implemented. The BER of the system in modes of coherent detection and non - coherent detection are compared. The results show that the unit information transmitting rate of the PPM ＋ PWM is superior to PPM, and its BER is superior to OOK.

关 键 词：脉冲宽度位置调制 单位传信率 相干检测 误比特率 

分 类 号：TN929.1[电子电信—通信与信息系统]