Abstract
The impact of multiple-input/single-output (MISO) relay-Assisted free-space optical systems by using transmit laser selection scheme in source-relay (S-R) and relay-destination (R-D) link on the diversity order as well as derive novel approximate closed-form bit-error rate expressions over gamma-gamma fading channels with pointing errors is investigated. Knowing that M and N are the number of transmit lasers corresponding to the MISO S-R and R-D links, respectively, and bSR, bRD, and bSD are the parameters, which depend on the atmospheric turbulence as well as pointing errors, i.e., bm = min(βm, φ2m ). It is concluded that the diversity order gain achieved is strongly dependent on the relay location, being significantly increased by N(bRD/bSD) when the relation N < (bSD + MbSR)/bRD is satisfied. This is dramatically decreased when diversity order is affected by pointing errors, being determined by min(N, M + 1) regardless of the relay location. © 2015 IEEE.
Antonio García-Zambrana
Professor of Telecommunications Engineering
Professor at the University of Málaga working on wireless optical communications, free-space optical links, underwater optical wireless communications, visible light communications, and FPGA/RFSoC-based real-time prototyping.
Beatriz del Castillo-Vázquez
Associate Professor of Telecommunications Engineering
Associate Professor at the University of Málaga working on wireless optical communications, free-space optical links, underwater optical wireless communications, optical channel modelling and system-level performance analysis.