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Free-Space Optical Communications Over Lognormal Fading Channels Using OOK With Finite Extinction Ratios Yang, Luanxia; Song, Xuegui; Cheng, Julian; Holzman, Jonathan F.

Abstract

Free-space optical communication links operating over lognormal turbulence channels using on-off keying (OOK) are studied in this work. Such systems can suffer from irreducible error floors that result from the use of demodulation with fixed and unoptimized detection thresholds. The resulting error floors are analyzed for the general case of low and high state offsets (i.e., finite extinction ratios). An electrical signal-to-noise ratio (SNR) optimized detection system is applied. The system uses the electrical SNRs to implement adaptive detection thresholds and eliminate the error floors. The system can accommodate operation with finite extinction ratios, as it uses the method of moments and maximum likelihhod estimation techniques to estimate the low and high state offsets and electrical SNR. Numerical results show that the SNR gap between the electrical-SNR-optimized detection system and the adaptive detection system is 2:3 dB at a bit-error rate of 10-⁵ without a state offset. The SNR gap increases to 4:5 dB with a state offset of = 0:2.

Item Metadata

Title
Free-Space Optical Communications Over Lognormal Fading Channels Using OOK With Finite Extinction Ratios
Creator
Yang, Luanxia; Song, Xuegui; Cheng, Julian; Holzman, Jonathan F.
Date Issued
2016
Description
Free-space optical communication links operating over lognormal turbulence channels using on-off keying (OOK) are studied in this work. Such systems can suffer from irreducible error floors that result from the use of demodulation with fixed and unoptimized detection thresholds. The resulting error floors are analyzed for the general case of low and high state offsets (i.e., finite extinction ratios). An electrical signal-to-noise ratio (SNR) optimized detection system is applied. The system uses the electrical SNRs to implement adaptive detection thresholds and eliminate the error floors. The system can accommodate operation with finite extinction ratios, as it uses the method of moments and maximum likelihhod estimation techniques to estimate the low and high state offsets and electrical SNR. Numerical results show that the SNR gap between the electrical-SNR-optimized detection system and the adaptive detection system is 2:3 dB at a bit-error rate of 10-⁵ without a state offset. The SNR gap increases to 4:5 dB with a state offset of = 0:2.
Subject
Atmospheric turbulence; optical wireless communications; on-off keying
Genre
Article; Postprint
Type
Text
Language
eng
Date Available
2016-10-06
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0319019
URI
http://hdl.handle.net/2429/59385
Affiliation
Applied Science, Faculty of; Engineering, School of (Okanagan)
Citation
Yang, L., Song, X., Cheng, J., & Holzman, J. F. (2016). Free-space optical communications over lognormal fading channels using OOK with finite extinction ratios. IEEE Access, 4, 574-584.
Publisher DOI
10.1109/ACCESS.2016.2520936
Peer Review Status
Reviewed
Scholarly Level
Faculty; Postdoctoral
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International