Comparison of pulse position modulation and pulse width modulation for application in optical communications

被引：32
|
作者：
Fan, Yangyu [1 ]
Green, Roger J.
机构：
[1] Northwestern Polytech Univ, Sch Elect & Informat, Xian 710072, Peoples R China
[2] Univ Warwick, Sch Engn, Div Elect & Elect Engn, Coventry CV4 7AL, W Midlands, England
来源：
OPTICAL ENGINEERING | 2007年 / 46卷 / 06期
关键词：
pulse position modulation; pulse width modulation; power efficiencies; bandwidth efficiencies; intersymbol interference;
D O I：
10.1117/1.2746010
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Different modulation methods for optical wireless have different power and bandwidth efficiencies. Each approach has a direct bearing on the quality and effectiveness of wireless optical communications. As two prime examples, pulse position modulation (PPM) and pulse width modulation (PWM) are compared. The comparison includes the power and bandwidth efficiencies, the power spectrum distribution, and the ability to resist intersymbol interference. Compact system models of multilevel digital PPM (L-PPM), and multilevel digital PWM (L-PWM) are also introduced. The results show that L-PPM has advantages in power efficiency and an approximately uniform spectral distribution, whereas L-PWM has a greater ability to resist intersymbol interference. (c) 2007 Society of Photo-Optical Instrumentation Engineers.
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页数：7
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