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    Fundamental Limits of Parallel Optical Wireless Channels: Capacity Results and Outage Formulation

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    10.1109-TCOMM.2016.2621743.pdf
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    Accepted manuscript
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    Type
    Article
    Authors
    Chaaban, Anas cc
    Rezki, Zouheir cc
    Alouini, Mohamed-Slim cc
    KAUST Department
    Communication Theory Lab
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-10-26
    Online Publication Date
    2016-10-26
    Print Publication Date
    2016
    Permanent link to this record
    http://hdl.handle.net/10754/621258
    
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    Abstract
    Multi-channel (MC) optical wireless communication (OWC) systems employing wave-division multiplexing for outdoors free-space optical communications, or multi-user timedivision multiple access for indoors visible-light communications, e.g., can be modeled as parallel channels. Multi-input multioutput OWC systems can also be transformed, possibly with some performance loss, to parallel channels using pre-/postcoding. Studying the performance of such MC-OWC systems requires characterizing the capacity of the underlying parallel channels. In this paper, upper and lower bounds on the capacity of constant parallel OWC channels with a total average intensity constraint are derived. Then, the paper focuses on finding intensity allocations that maximize the lower bounds given channel-state information at the transmitter (CSIT). Due to its nonconvexity, the KKT conditions are used to describe a list of candidate allocations. Instead searching exhaustively for the best solution, low-complexity near-optimal algorithms are proposed. The resulting optimized lower bound nearly coincides with capacity at high signal-to-noise ratio (SNR). Under a quasi-static channel model and in the absence of CSIT, outage probability upper and lower bounds are derived. Those bounds also meet at high SNR, thus characterizing the outage capacity in this regime. Finally, the results are extended to a system with both average and peak intensity constraints.
    Citation
    Chaaban A, Rezki Z, Alouini M-S (2016) Fundamental Limits of Parallel Optical Wireless Channels: Capacity Results and Outage Formulation. IEEE Transactions on Communications: 1–1. Available: http://dx.doi.org/10.1109/TCOMM.2016.2621743.
    Sponsors
    Qatar National Research Fund[NPRP 9-077-2-036]
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Communications
    DOI
    10.1109/TCOMM.2016.2621743
    Additional Links
    http://ieeexplore.ieee.org/document/7707381/
    ae974a485f413a2113503eed53cd6c53
    10.1109/TCOMM.2016.2621743
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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