Optimum Device and Modulation Scheme Selection for Optical Wireless Communications

There has been an extensive modelling of the optical wireless channel, and the optimum modulation scheme for a particular channel is well-understood. However, this modelling has not taken into account the trade-offs that transmitter and receiver selection usually involve. For a particular type of tr...

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Bibliographic Details
Published in:Journal of lightwave technology 2021-04, Vol.39 (8), p.2281-2287
Main Authors: Chun, Hyunchae, Rajbhandari, Sujan, Faulkner, Grahame, Xie, Enyuan, McKendry, Jonathan J. D., Gu, Erdan, Dawson, Martin D., OBrien, Dominic
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Detectors
Equalisation
Gallium nitrides
LiFi
Light emitting diodes
micro-LED
Modelling
Modulation
OFDM
optical communications
Optical receivers
Optical sensors
Optical transmitters
Optical wireless
optical wireless communication
Optimization
OWC
RC LED
Signal to noise ratio
technology-curve
visible light communication
VLC
Wireless communication systems
Wireless communications
WLED
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Summary:There has been an extensive modelling of the optical wireless channel, and the optimum modulation scheme for a particular channel is well-understood. However, this modelling has not taken into account the trade-offs that transmitter and receiver selection usually involve. For a particular type of transmitter, the modulation bandwidth and available power are closely related, as are receiver bandwidth, active area and sensitivity. In this article, we present a design approach that takes this device selection into account. The article details a general design method for an optical wireless communication system using a holistic design approach (i.e., considering channel, modulation schemes, and device constraints). The article shows results for particular examples, showing a substantial increase in margin (or data-rate) is available using this approach. For instance, by using this approach mutually optimising both modulation schemes and device constraints, it is found that for an optimally chosen Gallium Nitride micro-LED and a commercial photo receiver pair, a 20 dB SNR margin (or ∼3 times data-rate improvement) can be obtained compared with a more typical approach mainly concerning the modulation scheme optimisation.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2021.3051379