Abstract
A relay cooperation scheme is proposed for a backscatter communication system (BCS), where the user backscatters incident signals from a carrier emitter (CE) to an IR and a relay simultaneously, and then the relay forwards the user’s information to the IR for throughput improvement. Two cases are considered that the relay is with an embedded energy source and the relay is without an embedded energy source. If the relay does not have an embedded energy source, it first harvests energy from the CE and then uses its harvested energy for information forwarding. For both cases, the time allocation problems on the user’s information backscattering, the user’s information forwarding, or the relay’s energy harvesting are formulated to maximize the system throughput, and then closed-form solutions are derived. Simulation results demonstrate the advantage of the proposed relay cooperation scheme with the optimal time allocation in terms of system throughput.
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