Full-Duplex Backscatter Interference Networks Based on Time-Hopping Spread Spectrum
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Authors
Liu, Wanchun
Huang, Kaibin
Zhou, Xiangyun
Durrani, Salman
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Institute of Electrical and Electronics Engineers (IEEE)
Abstract
Future Internet-of-Things (IoT) is expected to wirelessly
connect billions of low-complexity devices. For wireless
information transfer (IT) in IoT, high density of IoT devices
and their ad hoc communication result in strong interference
which acts as a bottleneck on wireless IT. Furthermore, battery
replacement for the massive number of IoT devices is difficult if
not infeasible, making wireless energy transfer (ET) desirable.
This motivates: (i) the design of full-duplex wireless IT to
reduce latency and enable efficient spectrum utilization, and
(ii) the implementation of passive IoT devices using backscatter
antennas that enable wireless ET from one device (reader) to
another (tag). However, the resultant increase in the density of
simultaneous links exacerbates the interference issue. This issue
is addressed in this paper by proposing the design of full-duplex
backscatter communication (BackCom) networks, where a novel
multiple-access scheme based on time-hopping spread-spectrum
(TH-SS) is designed to enable both one-way wireless ET and
two-way wireless IT in coexisting backscatter reader-tag links.
Comprehensive performance analysis of BackCom networks is
presented in this paper, including forward/backward bit-error
rates and wireless ET efficiency and outage probabilities, which
accounts for energy harvesting at tags, non-coherent and coherent
detection at tags and readers, respectively, and the effects of
asynchronous transmissions.
Description
Keywords
Backscatter communication, wireless energy transfer, multiple-access technique, interference network, spreadspectrum communication.
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IEEE Transactions on Wireless Communications
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Journal article
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Open Access
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Author/s Accepted Manuscript (AAM) / Post-print