Low-SNR Capacity of Parallel IM-DD Optical Wireless Channels

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Type
Article
Authors
Chaaban, Anas cc
Rezki, Zouheir cc
Alouini, Mohamed-Slim cc
KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Date
2016-11-29

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Abstract
The capacity of parallel intensity-modulation and direct-detection (IM-DD) optical wireless channels with total average intensity and per-channel peak intensity constraints is studied. The optimal intensity allocation at low signal-to-noise ratio (SNR) is derived, leading to the capacity-achieving onoff keying (OOK) distribution. Interestingly, while activating the strongest channel is optimal if (i) the peak intensity is fixed, this is not the case if (ii) the peak intensity is proportional to the average intensity. The minimum average optical intensity per bit is also studied, and is characterized for case (i) where it is achievable at low SNR. However, in case (ii), the average optical intensity per bit grows indefinitely as SNR decreases, indicating that lower optical intensity per bit can be achieved at moderate SNR than at low SNR.
Citation
Chaaban A, Rezki Z, Alouini M-S (2016) Low-SNR Capacity of Parallel IM-DD Optical Wireless Channels. IEEE Communications Letters: 1–1. Available: http://dx.doi.org/10.1109/LCOMM.2016.2633339.
Sponsors
This work was supported in part by the Qatar National Research Fund (a member of Qatar Foundation) under Grant NPRP 9-077-2-036. The statements made herein are solely the responsibility of the authors
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Journal
IEEE Communications Letters
ISSN
1089-7798
DOI
10.1109/LCOMM.2016.2633339
Handle URI
http://hdl.handle.net/10754/621899
Additional Links
http://ieeexplore.ieee.org/document/7762033/
Collections
Articles; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division