Ergodic Capacity Analysis of Free-Space Optical Links With Nonzero Boresight Pointing Errors

Author

Ansari, Imran Shafique ; Alouini, Mohamed-Slim ; Cheng, Julian

Author_Institution

Comput. Electr. & Math. Sci. & Eng. (CEMSE) Div., King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia

Volume

14

Issue

8

fYear

2015

fDate

Aug. 2015

Firstpage

4248

Lastpage

4264

Abstract

A unified capacity analysis of a free-space optical (FSO) link that accounts for nonzero boresight pointing errors and both types of detection techniques (i.e. intensity modulation/direct detection as well as heterodyne detection) is addressed in this work. More specifically, an exact closed-form expression for the moments of the end-to-end signal-to-noise ratio (SNR) of a single link FSO transmission system is presented in terms of well-known elementary functions. Capitalizing on these new moments expressions, we present approximate and simple closed-form results for the ergodic capacity at high and low SNR regimes. All the presented results are verified via computer-based Monte-Carlo simulations.

Keywords

Monte Carlo methods; heterodyne detection; intensity modulation; method of moments; optical links; optical modulation; SNR; computer-based Monte-Carlo simulations; detection techniques; direct detection; ergodic capacity analysis; free-space optical links; heterodyne detection; intensity modulation; moments expressions; nonzero boresight pointing errors; signal-to-noise ratio; single link FSO transmission system; Adaptive optics; Atmospheric modeling; Optical mixing; Radio frequency; Signal to noise ratio; Wireless communication; Ergodic capacity; free-space optical (FSO) communications; moments; optical wireless communications; pointing errors; turbulent channels;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2015.2418285

Filename

7076656