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A novel project‐and‐forward relay‐assisted mixed RF‐FSO system design and its performance evaluation
Author(s) -
Khanna Himanshu,
Aggarwal Mona,
Ahuja Swaran
Publication year - 2019
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3584
Subject(s) - nakagami distribution , fading , cumulative distribution function , mimo , relay , radio frequency , transmission (telecommunications) , computer science , probability density function , electronic engineering , bit error rate , channel (broadcasting) , maximal ratio combining , signal to noise ratio (imaging) , path loss , mathematics , wireless , telecommunications , physics , statistics , engineering , power (physics) , quantum mechanics
The outage and error performance of a radio frequency (RF)‐free space optical (FSO) asymmetric two‐hop link using project‐and‐forward relaying protocol is evaluated in this paper. We suggest a multiple‐input–multiple‐output (MIMO)‐RF channel with multiple source and relay antennas for simultaneous transmission over the RF link followed by an FSO channel that supports point‐to‐point transmission over a single FSO link. Furthermore, the source to relay RF link is modeled by Nakagami‐ m fading distribution to represent different channel fading conditions often encountered in various applications, while the FSO channel is affected by atmospheric turbulence characterized by Gamma‐Gamma fading, path loss, and misalignment errors. The performance of the system is investigated considering the impact of these parameters. We derive the mathematical expressions that are obtained in closed form for the probability density function and cumulative distribution function of the instantaneous signal‐to‐noise ratio for the Nakagami‐ m faded MIMO‐RF link in terms of Meijer's G‐function. Using the aforementioned statistical results, we derive a novel closed‐form expression for the outage probability of the system. We also evaluate the average‐bit‐error‐rate performance for different coherent and noncoherent modulation schemes, and obtain novel mathematical results in closed form for the same.