Open AccessAverage capacity of FSO links with transmit laser selection using non-uniform OOK signaling over exponential atmospheric turbulence channels
Author(s) -
Antonio García-Zambrana,
Beatriz Castillo-Vázquez,
Carmen Castillo-Vázquez
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.020445
Subject(s) - free space optical communication , optical wireless , keying , on off keying , optics , bandwidth (computing) , physics , channel capacity , turbulence , antenna diversity , optical communication , computer science , telecommunications , channel (broadcasting) , wireless , bit error rate , quadrature amplitude modulation , meteorology
A new upper bound on the capacity of power- and bandwidth-constrained optical wireless links using selection transmit diversity over exponential atmospheric turbulence channels with intensity modulation and direct detection is derived when non-uniform on-off keying (OOK) formats are used. In this strong turbulence free-space optical (FSO) scenario, average capacity is investigated subject to an average optical power constraint and not only to an average electrical power constraint when the transmit diversity technique assumed is based on the selection of the optical path with a greater value of irradiance. Simulation results for the mutual information are further demonstrated to confirm the analytical results for different diversity orders.