Evaluating pointing errors on ergodic capacity of DF relay-assisted FSO communication systems

Ruben-Boluda-Ruiz, Antonio García-Zambrana, Beatriz del Castillo-Vázquez, Carmen Castillo-Vázquez
January 2015
Cite DOI URL

Abstract

Ergodic capacity of decode-and-forward (DF) relay-assisted free-space optical (FSO) communication systems when line of sight is available is analyzed over gamma-gamma fading channels with pointing errors. Novel closed-form approximate ergodic capacity expression is obtained in terms of the H-Fox function for a 3-way FSO communication system when the α-μ distribution to efficiently approximate the probability density function (PDF) of the sum of gamma-gamma with pointing errors variates is considered. Moreover, we present a novel asymptotic expression at high signal-to-noise ratio (SNR) for the ergodic capacity of DF relay-assisted FSO systems. The main contribution in this work lies in an in-depth analysis about the impact of pointing errors on the ergodic capacity for cooperative FSO systems. In order to maintain the same performance in terms of capacity, it is corroborated that the presence of pointing errors requires an increase in SNR, which is related to the fraction of the collected power at the receive aperture, i.e. A0. Simulation results are further demonstrated to confirm the accuracy and usefulness of the derived results. © 2015 IEEE.

Type
Conference paper
Publication
IEEE Vehicular Technology Conference
Channel Capacity Communication Channels (Information Theory) Decoding Errors Optical Communication Probability Density Function Probability Distributions Signal to Noise Ratio Asymptotic Ergodic Capacity Analyse Asymptotics Capacity Analysis Cooperative Communi Cation Decode-and-Forward Ergodic Capacity Free-Space Optical H-Fox Function Fading Channels
Antonio García-Zambrana
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
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.