Abstract
In this paper, we propose backscatter based cooperative transmission for wireless-powered heterogeneous networks (WPHetNets). In WPHetNets, where various kinds of nodes such as high-power base station (e.g., TV tower, macro base station) and small-power access point (e.g., WiFi) coexist, we aim to increase transmission range and support fair communication for battery-free internet-of-things (IoT) devices through user cooperation. For this, we propose long-range bistatic backscatter (BB) based distributed beamforming (DTB) where ambient backscatter (AB) supports short-range information exchange between devices for energy neutral operation, which is termed 'Cooperation mode'. In order to ensure fairness between devices, we formulate common-throughput maximization problem, where an algorithm for optimal time allocation is presented. Comparing with 'Non-Cooperation mode' (i.e., no information exchange via AB) and active RF based cooperation schemes, the proposed scheme is shown to increase both coverage and fairness between IoT devices for low-power wide area network (LP-WAN).
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