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

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 compa...

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Bibliographic Details
Published in:Optical Engineering 2007-06, Vol.46 (6), p.065001-065007
Main Authors: Fan, Yangyu, Green, Roger J
Format: Article
Language:English
Subjects:
Bandwidth
bandwidth efficiencies
Digital
Interference
intersymbol interference
Multilevel
Optical communication
power efficiencies
Pulse duration modulation
Pulse position modulation
pulse width modulation
Resists
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Summary: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.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.2746010