Type
ArticleKAUST Department
Communication Theory LabComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2016-11-29Online Publication Date
2016-11-29Print Publication Date
2017-03Permanent link to this record
http://hdl.handle.net/10754/621899
Metadata
Show full item recordAbstract
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 authorsJournal
IEEE Communications LettersAdditional Links
http://ieeexplore.ieee.org/document/7762033/ae974a485f413a2113503eed53cd6c53
10.1109/LCOMM.2016.2633339