Performance Analysis of Dual-Hop THz Transmission Systems over α-μ Fading Channels with Pointing Errors

• Published in: IEEE internet of things journal Vol. 9; no. 14; p. 1
• Main Authors: Li, Sai, Yang, Liang
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 15.07.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymptotic properties; Bit error rate; Channel capacity; Codes; Distribution functions; dual-hop transmission; Fading; Mathematical analysis; Monte Carlo simulation; multi-relay; Performance evaluation; Performance measurement; Probability density function; Probability density functions; Radio frequency; Rayleigh channels; Relaying; relaying systems; Relays; Signal to noise ratio; Statistical analysis; Terahertz wireless communications; Wireless communication; Wireless communication systems
• ISSN: 2327-4662; 2327-4662
• DOI: 10.1109/JIOT.2021.3131978

In this paper, the performance of a dual-hop relaying terahertz (THz) wireless communication system is investigated. In particular, the behaviors of the two THz hops are determined by three factors, such as the deterministic path loss, the fading effects, and pointing errors. Assuming that both THz links are subject to the α-μ fading with pointing errors, we derive exact expressions for the cumulative distribution function (CDF) and probability density function (PDF) of the end-to-end signal-to-noise ratio (SNR). With these statistical expressions, some important performance metrics are evaluated, like the outage probability, average bit error rate, and average channel capacity. Moreover, the asymptotic analyses are presented to obtain more insights. Results show that the dual-hop relaying scheme has better performance than the single THz link. Furthermore, the system diversity order depends on the fading parameters and pointing errors of both THz links. In addition, we extend the analysis to a multi-relay cooperative diversity system and derive the asymptotic symbol error rate expressions. Finally, the derived analytical expressions are verified by the Monte Carlo simulation.