On the distribution of the sum of gamma-gamma variates and application in MIMO optical wireless systems

Authors:
Nestor D. Chatzidiamantis;George K. Karagiannidis;Diomidis S. Michalopoulos
Affiliations:
Department of Electrical & Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece;Department of Electrical & Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece;Department of Electrical & Computer Engineering, The University of British Columbia, Vancouver, Canada
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

Citing 6
Cited 2

Statistical characterisation and modelling of SAR images

Signal Processing
Optical wireless links with spatial diversity over strong atmospheric turbulence channels

IEEE Transactions on Wireless Communications
BER Performance of Free-Space Optical Transmission with Spatial Diversity

IEEE Transactions on Wireless Communications
Diversity reception over generalized-K (KG) fading channels

IEEE Transactions on Wireless Communications
Do We Really Need OSTBCs for Free-Space Optical Communication with Direct Detection?

IEEE Transactions on Wireless Communications - Part 2
Part 1: optical communication over the clear turbulent atmospheric channel using diversity

IEEE Journal on Selected Areas in Communications

Turbo-coded MC-CDMA communication link over strong turbulence fading limited FSO channel with receiver space diversity

ISRN Communications and Networking
Maximal Ratio Combining (MRC) in Shadowed Fading Channels in Presence of Shadowed Fading Cochannel Interference (CCI)

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	0.02

Visualization

Abstract

We present a novel approach for the accurate approximation, via closed-form expressions, of the distribution of the sum of independent and not necessarily identically distributed Gamma-Gamma (GG) variates. It is shown that the probability density function (PDF) of the GG sum can be efficiently approximated either by the PDF of a single GG distribution, or by a finite weighted sum of PDFs of GG distributions. Ascertaining on this result, the performance of multiple input multiple output (MIMO) optical wireless (OW) systems is investigated and approximative closed-form expressions for important performance metrics are derived. Numerical results and simulations illustrate the accuracy of the proposed approach.