TY - JOUR
T1 - Low-SNR Capacity of Parallel IM-DD Optical Wireless Channels
AU - Chaaban, Anas
AU - Rezki, Zouheir
AU - Alouini, Mohamed-Slim
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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
PY - 2016/11/29
Y1 - 2016/11/29
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/621899
UR - http://ieeexplore.ieee.org/document/7762033/
UR - http://www.scopus.com/inward/record.url?scp=85015775709&partnerID=8YFLogxK
U2 - 10.1109/LCOMM.2016.2633339
DO - 10.1109/LCOMM.2016.2633339
M3 - Article
SN - 1089-7798
VL - 21
SP - 484
EP - 487
JO - IEEE Communications Letters
JF - IEEE Communications Letters
IS - 3
ER -