Performance of Hybrid Transmission of a D2D Communication With Energy Harvesting and Ambient Backscattering

Abstract

In order to improve spectrum efficiency and green energy utilization, this paper investigates a green paradigm for a relay-assisted device-to-device (D2D) communication with energy harvesting (EH) and ambient backscattering (ABSC). The considered D2D network utilizes the existing cellular infrastructure for their communication. In this paradigm relay is equipped with cognitive radio (CR) technique and harvests energy from RF signal of secondary user (SU) and cellular user (CU). To lower the usage of battery power, a sensing based hybrid transmission model is proposed. It combines overlay, underlay, and backscatter transmissions based on sensing decisions. During first hop of transmission, SU transmits either in overlay mode or underlay mode while in second hop, relay forwards the received information to the destination either in overlay mode or ambient backscatter mode (ABCSM). A hybrid method of transmission that uses a radio architecture is developed for relay. Analytical expressions for outage, ergodic capacity and throughput are developed for four different cases, and an overall scenario under an interference constraint. End-to-end overall throughput maximization problem for optimal sensing time and power allocation to SU and relay is studied. An algorithm is proposed to maximize the D2D network throughput. Impact of interference to CU’s quality of service is analyzed.

Keywords

• Ambient backscattering
• D2D communication
• hybrid transmission
• outage
• overlay
• throughput