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Performance Analysis of Backscatter Communication Systems with Non-orthogonal Multiple Access in Nakagami Fading Channels

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Document pages: 25 pages

Abstract: Backscatter communication (BackCom) has been emerging as a prospectivecandidate in tackling lifetime management problems for massively deployedInternet-of-Things devices, which suffer from battery-related issues, i.e.,replacements, charging, and recycling. This passive sensing approach allows abackscatter sensor node (BSN) to transmit information by reflecting theincident signal from a carrier emitter without initiating its transmission. Tomultiplex multiple BSNs, power-domain non-orthogonal multiple access (NOMA),which is a prime candidate for multiple access in beyond 5G systems, is fullyexploited in this work. Recently, considerable attention has been devoted tothe NOMA-aided BackCom networks in the context of outage probabilities andsystem throughput. However, the closed-form expressions of bit error rate (BER)for such a system have not been studied. In this paper, we present the designand analysis of a NOMA enhanced bistatic BackCom system for a battery-lesssmart communication paradigm. Specifically, we derive the closed-form BERexpressions for a cluster of two devices in a bistatic BackCom system employingNOMA with imperfect successive interference cancellation under Nakagami-$m$fading channel. The obtained expressions are utilized to evaluate thereflection coefficients of devices needed for the most favorable systemperformance. Our results also show that NOMA-BackCom achieves better datathroughput compared to the orthogonal multiple access-time domain multipleaccess schemes (OMA-TDMA).

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