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In this paper, we investigate the performance of commensal ambient backscatter communications (AmBC) that ride on a non-orthogonal multiple access (NOMA) downlink transmission, in which a backscatter device (BD) splits part of its received signals from the base station (BS) for energy harvesting, and backscatters the remaining received signals to transmit information to a cellular user. Specifically, under the power consumption constraint at BD and the peak transmit power constraint at BS, wedoi:10.23919/jcc.2020.06.007 fatcat:j26o3n3rkzbqbpb3u3gddzgtxa