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Vehicle-to-vehicle (V2V) communications is a part of next-generation wirelessnetworks to create smart cities with the connectivity of intelligenttransportation systems. Besides, green communications is considered in V2Vcommunication systems for energy sustainability and carbon neutrality. In thisscope, radio-frequency (RF) energy harvesting (EH) provides a battery-freeenergy source as a solution for the future of V2V communications. Herein, theemployment of RF-EH in V2V communications is considered where the bit errorprobability (BEP) of a dual-hop decode-and-forward relaying system is obtaineddepending on the utilization of antennas at the relay. The multiple antennapower-constraint relay harvests its power by applying dedicated antenna(DA)/power splitting (PS) EH modes and linear (L)/nonlinear (NL) EH models.Moreover, the links between nodes are exposed to double-Rayleigh fading.Finally, the performance of different system parameters is compared usingtheoretical derivations of BEP. The results provide a comprehensive analysis ofthe proposed system considering PS/DA-EH modes and L/NL-EH models, as well asdeterministic/uniformly distributed placement of nodes. It is observed thatPS-EH outperforms DA-EH assuming a placement of an equal number of antennas anddistances. Moreover, optimal performance of PS/DA-EH is achieved by allocatingmore power and increasing the number of antennas for EH, respectively.

Linear/Non-Linear Energy Harvesting Models via Multi-Antenna Relay Cooperation in V2V Communications