Title :
Outage Analysis of Practical FSO/RF Hybrid System With Adaptive Combining
Author :
Rakia, Tamer ; Hong-Chuan Yang ; Alouini, Mohamed-Slim ; Gebali, Fayez
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Victoria, Victoria, BC, Canada
Abstract :
Hybrid free-space optical (FSO)/radio-frequency (RF) systems have emerged as a promising solution for high-data-rate wireless transmission. We present and analyze a transmission scheme for the hybrid FSO/RF communication system based on adaptive combining. Specifically, only FSO link is active as long as the instantaneous signal-to-noise ratio (SNR) at the FSO receiver is above a certain threshold level. When it falls below this threshold level, the RF link is activated along with the FSO link and the signals from the two links are combined at the receiver using a dual-branch maximal ratio combiner. Novel analytical expression for the cumulative distribution function (CDF) of the received SNR for the proposed hybrid system is obtained. This CDF expression is used to study the system outage performance. Numerical examples are presented to compare the outage performance of the proposed hybrid FSO/RF system with that of the FSO-only and RF-only systems.
Keywords :
diversity reception; optical communication; telecommunication network reliability; CDF; FSO link; FSO/RF communication system; FSO/RF hybrid system; RF link; SNR; adaptive combining; cumulative distribution function; high-data-rate wireless transmission; hybrid free-space optical; maximal ratio combiner; outage analysis; radiofrequency systems; signal-to-noise ratio; Diversity reception; Hybrid power systems; Optical attenuators; Optical receivers; Radio frequency; Signal to noise ratio; Gamma-Gamma atmospheric turbulence; Hybrid FSO/RF; MRC combining; Nakagami- $m$ fading model; Nakagami-m fading model; Outage probability; gamma-gamma atmospheric turbulence; outage probability;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2015.2443771
