Backscatter Communication Powered By Selective Relaying

In this paper, we exploit the cooperative transmission as a new energy supply to support backscatter communication (BackCom), where there are multiple decode-and-forward (DF) relays and only one relay is selected in the cooperative system. The tag circuit power and signal backscattering are respectively supported by transmit powers of the source and the relay, and the minimum mean square error (MMSE) detector is employed at the receiver of the BackCom user to mitigate the interference from the cooperative system. Our objective is to maximize the quality of service (QoS) of the BackCom user which satisfying the QoS of the cooperative system, the total power constraint on the cooperative system and the harvested power constraint on the BackCom user. The probability of feasibility conditions, and optimized joint relay selection and power allocation are investigated in closed-form expressions. The zero forcing (ZF) detection and its comparison with the MMSE detection in the considered system are also analyzed. Simulation results demonstrate the benefit of the proposed scheme compared with traditional ones.