Performance Analysis of Two-Way Relaying in Cooperative Power Line Communications

Roger Kwao Ahiadormey, Prince Anokye, Han-Shin Jo, Kyoung-Jae Lee
2019 IEEE Access  
This paper studies the performance of a half-duplex (HD) two-way relay (TWR) in power line communication (PLC) over a log-normal fading channel with impulsive noise. We consider the two common relaying protocols: amplify-and-forward (AF) and decode-and-forward (DF). For the DF relaying, we apply physical-layer network coding (PNC) and analog-network coding (ANC) to the PLC TWR. We derive analytic expressions for the average sum capacity and the outage probability of the system. The Monte Carlo
more » ... imulations are provided throughout to validate our analysis. The analytical results show a tight approximation to the simulation results. We compare the one-way relay (OWR) to the TWR and show that the HD spectral efficiency loss incurred by the OWR can be sufficiently mitigated in PLC. However, the outage probability of the TWR is inferior to that of the OWR. To enhance the outage performance of the PLC TWR, we implement a hybrid PLC/wireless (HPW) system, where all nodes are equipped with the PLC and wireless capabilities. Data transmission occurs over the two parallel links. The diversity in the transmission allows the TWR to improve its outage performance in the AF and DF protocols. The impact of the impulsive noise, inherent to the PLC channels, is also highlighted in the simulation results. It is shown that the impulsive noise severely impairs system performance. INDEX TERMS Two-way relaying, average capacity, outage probability, power line communication (PLC), PLC/wireless diversity. The associate editor coordinating the review of this manuscript and approving it for publication was Khaled Rabie. be broadly grouped as narrowband (NB) or broadband (BB) [2] . NB PLC typically operates in the 3-500kHz range and is accompanied by low data rates. NB PLC is appropriate for smart metering, smart homes, monitoring, and control applications [2] . To meet the high data demands in multimedia services, BB PLC which operates in the 1.8-250MHz range offers high data rates and typically employed in in-home applications (e.g., high-speed internet access) [2] . In view of this, several PLC standards have been proposed for SG applications [3]- [5] . However, the data rates and the reliability of the PLC network are affected by increased impulsive noise, interference, multipath effects, and signal fading over long cable lengths. To overcome these challenges, multipleinput multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), non-orthogonal multiple access (NOMA), and relaying have been proposed for the PLC network [6]-[9]. In [6], by combining MIMO and 97264 This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see http://creativecommons.org/licenses/by/4.0/ VOLUME 7, 2019
doi:10.1109/access.2019.2926750 fatcat:tjzb5x5rhbed7ctdfhlduofoce