Joint Hybrid and Passive Beamforming for Millimeter Wave Symbiotic Radio Systems
Symbiotic radio (SR), which enables a backscatter device (BD) to transmit information to a primary receiver (PR) by modulating primary signals, has emerged as an energy-, spectrum-, and cost-efficient communication technology for Internet-of-Things. This letter studies a millimeter wave (mmWave) SR...
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Published in | IEEE wireless communications letters Vol. 10; no. 10; pp. 2294 - 2298 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Piscataway
IEEE
01.10.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
ISSN | 2162-2337 2162-2345 |
DOI | 10.1109/LWC.2021.3099947 |
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Summary: | Symbiotic radio (SR), which enables a backscatter device (BD) to transmit information to a primary receiver (PR) by modulating primary signals, has emerged as an energy-, spectrum-, and cost-efficient communication technology for Internet-of-Things. This letter studies a millimeter wave (mmWave) SR system in which a primary transmitter (PT) sends information to a PR via mmWave communication. We maximize the achievable rate of the backscatter link subject to the rate constraint of the direct link, by jointly optimizing the PT's hybrid beamforming (HBF) and the BD's passive beamforming (PBF). An iterative algorithm based on alternating optimization is proposed to solve the formulated non-convex problem. Numerical results show that the optimal joint-beamforming design enhances the backscatter-link rate significantly compared to the benchmark with only HBF. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 |
ISSN: | 2162-2337 2162-2345 |
DOI: | 10.1109/LWC.2021.3099947 |