On the capacity of a SIM-based cooperative NLOS UVC system with best relay selection

IF 4.1 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS ICT Express Pub Date : 2024-04-01 DOI:10.1016/j.icte.2023.10.006

Kamal K. Garg , Parvez Shaik , Rachna Sharma , Peter Brida , Ondrej Krejcar , Vimal Bhatia

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Abstract

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.

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基于 SIM 的合作式 NLOS UVC 系统的容量与最佳中继选择

紫外线通信（UVC）是一种前景广阔的技术，因为它能够在非视距（NLOS）模式下运行，从而消除了红外线和可见光通信所需的指向采集和跟踪（PAT）要求。然而，非视距紫外线在长距离运行时会出现极高的衰减和湍流引起的衰减。由于这些局限性，现有关于 NLOS UVC 的文献大多仅限于短距离通信。因此，本文针对这些挑战，提出了一种基于室外子载波强度调制（SIM）的多中继合作通信系统，采用最佳中继选择和解码前向（DF）中继协议。在弱大气湍流条件下，使用对数正态分布对湍流引起的衰减进行建模。我们推导出了中断概率和遍历容量的新型闭式分析表达式。通过数值模拟验证了推导出的分析表达式的正确性。

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来源期刊

ICT Express Multiple-

CiteScore

10.20

自引率

1.90%

发文量

167

审稿时长

35 weeks

期刊介绍： The ICT Express journal published by the Korean Institute of Communications and Information Sciences (KICS) is an international, peer-reviewed research publication covering all aspects of information and communication technology. The journal aims to publish research that helps advance the theoretical and practical understanding of ICT convergence, platform technologies, communication networks, and device technologies. The technology advancement in information and communication technology (ICT) sector enables portable devices to be always connected while supporting high data rate, resulting in the recent popularity of smartphones that have a considerable impact in economic and social development.