Abstract
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 simulations 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.
Highlights
Smart grid (SG) technology is considered an integral part of next-generation electric power grids to improve upon the quality of service (QoS)
To account for the signal attenuation, we introduce a distance-dependent cable attenuation which is modeled by ai = exp (−(b0 + b1f k )di), where di is the distance between the nodes, f represents the operating frequency in MHz, k is the exponent of the attenuation factor, b0, and b1 are the attenuation constants obtained from measurements [47]
HYBRID power line communication (PLC)/WIRELESS PERFORMANCE ANALYSIS To improve the reliability of the PLC network, we investigate the performance of an hybrid PLC/wireless (HPW) network in the two-way relay (TWR) where the source nodes transmit their signals through two independent communication links, i.e., PLC and wireless communications
Summary
Smart grid (SG) technology is considered an integral part of next-generation electric power grids to improve upon the quality of service (QoS). Performance analysis of an AF TWR in PLC is carried out in [34], where the authors derived closedform expressions for the outage probability, the symbol error rate, and the average capacity. In [37], the authors presented a PLC network with PNC to boost the capacity of TWRs. performance analysis of the protocols was not considered in [36] and [37]. We analyze the performance of a halfduplex PLC TWR for both relaying protocols and networking coding schemes in realistic channel environments, and we further propose a technical solution leveraging channel diversity. Based on the analytic results, we propose an HPW diversity technique where all nodes are equipped with PLC and wireless capabilities to enhance the reliability of the TWR.
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