A novel project‐and‐forward relay‐assisted mixed RF‐FSO system design and its performance evaluation. Issue 5 (20th February 2019)

• Record Type: Journal Article
• Authors: Khanna, Himanshu; Aggarwal, Mona; Ahuja, Swaran
• Is Part Of: Transactions on emerging telecommunications technologies. Volume 30:Issue 5(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-02-20
• Subjects: Telecommunication -- Periodicals; 384.05
• DOI: 10.1002/ett.3584
• Languages: English
• ISSNs: 2161-5748

Abstract

Abstract: 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. Abstract : The outage and error performance of a MIMO based RF‐FSO link using project‐and‐forward relaying protocol is evaluated. We derive new expressions for pdf and cdf of the instantaneous SNR for the Nakagami‐m faded MIMO‐RF link. Using these results, we derive outage probability of the system and average‐bit‐error‐rate for different coherent and non‐coherent modulation schemes, and obtain novel results in closed form for them.