Title :
On the Distribution of the Sum of Gamma-Gamma Variates and Application in MIMO Optical Wireless Systems
Author :
Chatzidiamantis, Nestor D. ; Karagiannidis, George K. ; Michalopoulos, Diomidis S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotle Univ. of Thessaloniki, Thessaloniki, Greece
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.
Keywords :
MIMO communication; optical fibre networks; MIMO optical wireless systems; gamma-gamma variates; multiple input multiple output optical wireless systems; probability density function; Application software; Atmospheric modeling; Closed-form solution; Distributed computing; Fading; MIMO; Optical computing; Optical receivers; Performance analysis; Statistical distributions;
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-4148-8
DOI :
10.1109/GLOCOM.2009.5425871
