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Optimal Channel Estimation for Reciprocity-Based Backscattering With a Full-Duplex MIMO Reader
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
2019 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 67, no 6, p. 1662-1677Article in journal (Refereed) Published
Abstract [en]

Backscatter communication (BSC) technology can enable ubiquitous deployment of low-cost sustainable wireless devices. In this paper, we investigate the efficacy of a full-duplex multiple-input-multiple-output reader for enhancing the limited communication range of monostatic BSC systems. As this performance is strongly influenced by the channel estimation (CE) quality, we first derive a novel least-squares estimator for the forward and backward links between the reader and the tag, assuming that reciprocity holds and K orthogonal pilots are transmitted from the first K antennas of an N antenna reader. We also obtain the corresponding linear minimum-mean square-error estimate for the backscattered channel. After defining the transceiver design at the reader using these estimates, we jointly optimize the number of orthogonal pilots and energy allocation for the CE and information decoding phases to maximize the average backscattered signal-to-noise ratio (SNR) for efficiently decoding the tags messages. The unimodality of this SNR in optimization variables along with a tight analytical approximation for the jointly global optimal design is also discoursed. Lastly, the selected numerical results validate the proposed analysis, present key insights into the optimal resource utilization at reader, and quantify the achievable gains over the benchmark schemes.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 67, no 6, p. 1662-1677
Keywords [en]
Backscatter communication; channel estimation; antenna array; reciprocity; full-duplex; global optimization
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:liu:diva-154827DOI: 10.1109/TSP.2019.2893859ISI: 000458847700001OAI: oai:DiVA.org:liu-154827DiVA, id: diva2:1293671
Note

Funding Agencies|ELLIIT; Swedish Research Council (VR)

Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-26

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Mishra, DeepakLarsson, Erik G
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Citation style
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