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In the fifth generation era, the pervasive applications of Internet of Thingsand massive machine-type communications have initiated increasing researchinterests on the backscatter wireless powered communication (B-WPC) techniquedue to its ultra high energy efficiency and low cost. The ubiquitous B-WPCnetwork is characterized by nodes with dynamic spatial positions and sporadicshort packets, of which the performance has not been fully investigated. Inthis paper, we give a comprehensive analysis of a multi-antenna B-WPC networkwith sporadic short packets under a stochastic geometry framework. Byexploiting a time-space Poisson point process model, the behavior of thenetwork is well captured in a decentralized and asynchronous transmission way.We then analyze the energy and information outage performance in the energyharvest and backscatter modulation phases of the backscatter network,respectively. The optimal transmission slot length and division are obtained bymaximizing the network-wide spatial throughput. Moreover, we find aninteresting result that there exists the optimal tradeoff between the durationsof the energy harvest and backscatter modulation phases for spatial throughputmaximization. Numerical results are demonstrated to verify our analyticalfindings and show that this tradeoff region gets shrunk when the outageconstraints become more stringent.

Wireless Powered Asynchronous Backscatter Networks with Sporadic Short Packets: Performance Analysis and Optimization