Abstract
Performance of optical wireless communication (OWC) in outdoor environments can be significantly degraded due to the fog and pointing errors. In this letter, we consider a multi-aperture detector which employs a low complexity opportunistic beam selection (OBS) in order to improve the performance of OWC system. We analyze the OBS scheme by deriving computable bounds on the average signal-to-noise ratio (SNR), ergodic rate, and diversity order and compare its performance by deriving exact analytical expressions of a single-aperture system. The derived bounds provide insights on the system behavior depicting significant benefit for OWC systems with small link distances which are typical in foggy environments. We also demonstrate the effect of various parameters of fog and pointing error on the OWC performance and validate the derived analytical expressions using numerical and simulation analysis. A two-aperture OBS achieves an SNR gain of approximately 4 dB and improves the outage performance by more than 20 folds for a half-km OWC link comparing to the single-aperture system without acquiring the channel state information.
Original language | English |
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Article number | 9079519 |
Pages (from-to) | 2029-2033 |
Number of pages | 5 |
Journal | IEEE Communications Letters |
Volume | 24 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2020 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 1997-2012 IEEE.
Funding
Manuscript received March 30, 2020; revised April 21, 2020; accepted April 21, 2020. Date of publication April 27, 2020; date of current version September 12, 2020. This work was supported in part by the BITS Pilani Research Initiation Grant under Grant BITS/RIG/128 and in part by DST-SERB SRG/2019/002345. The associate editor coordinating the review of this letter and approving it for publication was O. Amin. (Corresponding author: Ziyaur Rahman.) The authors are with the Department of Electrical and Electronics Engineering, BITS Pilani, Pilani 333031, India (e-mail: [email protected]. ac.in; [email protected]; [email protected]). Digital Object Identifier 10.1109/LCOMM.2020.2990218
Funders | Funder number |
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DST-SERB | SRG/2019/002345 |
Keywords
- Diversity
- ergodic rate
- foggy channel
- optical wireless communication
- performance analysis
- pointing error