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

Ba Cao Nguyen,Le The Dung,Xuan Hung Le,Van Duan Nguyen,Changqing Luo

doi:10.1155/2021/8865615

Ba Cao Nguyen, Le The Dung + Show 3 more

Open Access

https://doi.org/10.1155/2021/8865615

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Abstract

This paper studies the ergodic capacity (EC) of full-duplex (FD) amplify-and-forward (AF) and decode-and-forward (DF) relay system with energy harvesting (EH) for vehicle-to-vehicle (V2V) communications. Unlike previous works on FD-EH systems, we consider the case that both relay and destination are mobile vehicles while the source is a static base station. We mathematically derive the exact closed-form expressions of ECs of both AF and DF protocols of the considered FD-EH-V2V relay system over cascade (double) Rayleigh fading. Our numerical results show that the ECs in the case of the V2V communication system are reduced compared to those in the case of stationary nodes. Also, with a specific value of residual self-interference (RSI), the ECs of the considered FD-EH-V2V relay system can be higher or lower than those of half-duplex- (HD-) EH-V2V system, depending on the average transmission power of the source. Furthermore, when the transmission power of the source and RSI are fixed, the ECs of the considered system can achieve peak values by using optimal EH time duration. On the other hand, the ECs of both AF and DF protocols reach the capacity floors in the high signal-to-noise ratio (SNR) regime due to the RSI impact. Also, the effect of RSI dominates the impact of cascade Rayleigh fading in the high SNR regime. Finally, we validate our analysis approach through Monte-Carlo simulations.

Highlights

In the age of Industry 4.0, various new techniques have been fast developed to satisfy the requirements of capacity and energy consumption of the future wireless networks such as the fifth-generation (5G) and beyond (B5G) [1,2,3]
We focused on analyzing the impacts of the cascade Rayleigh fading channel, residual self-interference (RSI), and time switching ratio on the ergodic capacity (EC) of the FD-energy harvesting (EH)-V2V relay system with the AF/DF protocol by deriving the exact closed-form expressions of these attributes and comparing with those in the case of Rayleigh fading channel, perfect SIC, and HD system
The mathematical expressions in the previous section are used to evaluate the ECs of the considered FDEH-V2V relay system with AF/DF protocols

Summary

Introduction

In the age of Industry 4.0, various new techniques have been fast developed to satisfy the requirements of capacity and energy consumption of the future wireless networks such as the fifth-generation (5G) and beyond (B5G) [1,2,3]. We focused on analyzing the impacts of the cascade Rayleigh fading channel, RSI, and time switching ratio on the ECs of the FD-EH-V2V relay system with the AF/DF protocol by deriving the exact closed-form expressions of these attributes and comparing with those in the case of Rayleigh fading channel, perfect SIC, and HD system. Harvests energy from the source while moving and exchanging signals We consider both AF and DF protocols at the relay (ii) We mathematically derive the exact closed-form expressions of the ECs of the considered FD-EHV2V relay system for both AF and DF protocols under the influences of RSI and cascade Rayleigh fading, validate these derived expressions by Monte-Carlo simulations.

System Model

Performance Analysis

Numerical Results and Discussions

Conclusion