On the capacity of a SIM-based cooperative NLOS UVC system with best relay selection
Kamal K. Garg,
Parvez Shaik,
Rachna Sharma,
Peter Brida,
Ondrej Krejcar,
Vimal Bhatia
Affiliations
Kamal K. Garg
Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore, 453552, M.P., India; School of Technology, Pandit Deendayal Energy University, Raisan Village, Gandhinagar, 382007, Gujarat, India
Parvez Shaik
Department of Electrical and Computer Engineering, Texas A & M University, Education City, 23874, Doha, Qatar
Rachna Sharma
Institute of Technology, Nirma University, SG Highway, Gota, Ahmedabad, 382481, Gujarat, India; Corresponding author.
Peter Brida
University of Zilina, Slovakia
Ondrej Krejcar
Faculty of Informatics and Management University of Hradec Kralove, 50003 Hradec Kralove, Czech Republic; Institute of Technology and Business in Ceske Budejovice, Ceske Budejovice, Czechia
Vimal Bhatia
Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore, 453552, M.P., India; Faculty of Informatics and Management University of Hradec Kralove, 50003 Hradec Kralove, Czech Republic; School of Electronic and Information Engineering, Soochow University, PR China,
Ultraviolet communication (UVC) is a promising technology due to its ability to operate in non-line-of-sight (NLOS) mode thereby eliminating the pointing acquisition and tracking (PAT) requirement as needed by infrared and visible light communications. However, NLOS UVC suffers from very high attenuation and turbulence-induced fading when operated over a long distance. Due to these limitations, the existing literature on the NLOS UVC is mostly restricted to short-distance communications only. Therefore, this paper addresses these challenges by proposing an outdoor subcarrier-intensity-modulation (SIM) based multi-relay cooperative communication system employing the best relay selection and decode-and-forward (DF) relaying protocol. The turbulence-induced fading is modelled using lognormal distribution under weak atmospheric turbulence conditions. We derive novel closed-form analytical expressions of outage probability and ergodic capacity. Correctness of the derived analytical expressions is validated through numerical simulations.
