Analysis of Outage Probability and Throughput for Energy Harvesting Full-Duplex Decode-and-Forward Vehicle-to-Vehicle Relay System

Abstract

In this paper, we evaluate the performance of a vehicle-to-vehicle (V2V) system where full-duplex relay (FDR) harvests the energy from source and uses decode-and-forward (DF) protocol to forward data from source to destination. Unlike existing works about FDR systems, we consider the scenario that both relay and destination are moving vehicles, leading to the channel between relay and destination characterized by double (cascade) Rayleigh fading. We successfully obtain the closed-form mathematical expressions of the outage probability (OP) and throughput of the considered energy harvesting- (EH-) FDR-V2V system. Based on these expressions, the system performance is investigated through various scenarios. Numerical results indicate that the performance of the considered system is reduced compared with that of the system over Rayleigh fading channels. We also observe that there is an optimal EH time duration that minimizes the OP and maximizes the throughput. This value depends on the transmission power of source. Furthermore, the OP goes to outage floor faster due to the impact of the residual self-interference (RSI), especially when RSI is high. All analysis results are verified by Monte-Carlo simulations.

On the Capacity of Full‐Duplex AF/DF Relay System with Energy Harvesting for Vehicle‐to‐Vehicle Communications

“…As a promising technology for nextgeneration (5G and B5G) wireless networks, FD wireless not only has the potential to double the spectrum efficiency in the physical layer but can also enhance the performance of wireless systems such as reducing feedback delay, end-toend delay, and congestion, improving the network secrecy and efficiency and increasing the throughput and spectrum usage flexibility [6,7]. Overall, it is envisaged that FD communication technology can be adopted in the near future in a number of scenarios and applications, such as throughput enhancement in the sub-6 GHz band, supporting ultralow delay communication, small and dense cells [6,[8][9][10].…”

“…In the literature, various works have combined EH and FD techniques in a wireless communication system to solve the battery and spectrum efficiency issues [8,10,11]. The mathematical analysis and the experimental measurements have been applied for investigating the performance of FD-EH systems.…”

“…The mathematical analysis and the experimental measurements have been applied for investigating the performance of FD-EH systems. Specifically, the mathematical analysis is used to derive expressions of outage probability (OP), symbol error rate (SER), bit error rate (BER), and ergodic capacity (EC) of the FD-EH systems [8,[10][11][12][13]. Based on these obtained mathematical expressions, the system behavior is analyzed under the effects of different parameters such as the residual self-interference (RSI) induced by FD transmission mode, the time switching ratio, and the channel conditions.…”

“…Thanks to FD and EH techniques, the V2V communication systems can reduce the delay time for signal transmission between vehicles and the power supply limitation problem [20,21]. Hence, the FD-EH-V2V relay system can be applied for the intelligent transportation systems (ITS) and the road safety applications [8,10,20]. Specifically, the onboard unit was proposed in [20] to supply the energy for FD-V2V communications from the vehicle engine.…”

“…Although this scheme could solve the energy issues, applying EH for V2V communication systems still becomes an inevitable trend thanks to many advantages of the EH technique. In recent reports, the OP, SER, and throughput of the FD-EH-V2V relay systems were obtained to investigate the system performance and evaluate the effects of several system parameters such as RSI, time switching ratio, and channel characteristics [8,10]. In particular, papers [8,10] derived the OP and SER expressions of FD-EH-V2V relay systems with AF and DF relaying protocols, respectively.…”