On the Performance of Reconfigurable Intelligent Surface AIded Power Line Communication System Under Different Relay Transmission Protocols

In this paper, the performance analysis of a dual-hop reconfigurable intelligent surface (RIS)-aided power line communication (PLC) system is presented under different relay transmission protocols.The relay is assumed to be decode-and-forward (DF) or amplify-and-forward (AF) relaying protocol.It is also assumed that the RIS link is subjected to Rayleigh fading while the PLC link undergoes Log-normal fading with the influence of additive background and impulsive noise.To evaluate the system performance, the end-to-end cumulative distribution function for both relaying protocols are derived.Based on these, the analysis expressions for the system outage probability and average bit error rate (ABER) are derived under DF and AF relaying protocols.To gain further insight about the system performance, the asymptotic analysis for the derived expressions is obtained at high signal-to-noise ratio regime.The findings illustrate the significant impact of the number of RIS elements and impulsive noise on the overall system performance.In addition, the accuracy of the analytical results is justified through Monte-Carlo simulations. INTRODUCTION. BACKGROUND INFORMATIONIn recent time, power line communication (PLC) systems have been considered as a competitive technology for high-speed data transmission through the utilization of existing and pre-installed power line networks for the distribution of both information and power [1].The system has significant advantages of providing last mile access to end users and reduces the cost of deployment.As a result of this, it has been considered as a feasible candidate for indoor and outdoor applications such as homenetworking, control applications, and smart metering [2].However, with all these excellent features, the PLC system is highly susceptible to various channel impairments which degrade the link reliability.Specifically, the PLC link generates electromagnetic interference which affects the surrounding wireless systems [3].In addition, PLC link suffers from two types of noises, i.e., impulsive noise and background noise which results in data loss.The impulse noise is a random occurring noise with high power spectral density (PSD) and short duration.The background noise is negligible over time with low PSD [4].Owing to frequency selectivity, the link also suffers from attenuation which can deteriorate the system achievable data rate and also introduces inter-symbol interference.This becomes more pronounced at high frequencies and with the increase in distance between the transmitter and receiver [3,5,6].Today, reconfigurable intelligent surface has gain considerable attention in the research community owing to its applications in the next-generation wireless communication systems [7].Compared with other technologies counterparts, it requires no complex encoding and decoding without additional power supply for signal transmission [8,9].They can be easily deployed on different infrastructural