Passive Reflection Techniques for Wireless Communications

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dc.contributor.advisorHan, Zhu
dc.contributor.committeeMemberPan, Miao
dc.contributor.committeeMemberLi, Geoffrey Y.
dc.contributor.committeeMemberSeddik, Karim G.
dc.contributor.committeeMemberPrasad, Saurabh
dc.creatorElMossallamy, Mohamed Ali
dc.date.accessioned2021-08-12T18:55:35Z
dc.date.createdDecember 2020
dc.date.issued2020-12
dc.date.submittedDecember 2020
dc.date.updated2021-08-12T18:55:37Z
dc.description.abstractDemand for wireless connectivity is increasing exponentially, with billions of devices expected to be connected in the coming few years. Traditional techniques used to support the increasing number of devices and associated traffic has caused the complexity and energy consumption of wireless networks to increase substantially over the years. Simple, energy-efficient technologies are needed to sustain the increasing demand for wireless connectivity. Use cases in future networks will range from very low-rate short-range services, e.g., internet of things (IoT) sensors, to high-rate broadband services, e.g., virtual reality (VR) headsets. Passive reflection radio techniques offer energy-efficient solutions for both use cases. For low-rate communications, ambient backscatter allows the devices to piggyback existing RF transmission, while for high-rate communications, reconfigurable intelligent surfaces (RIS) can be used to control the propagation to support higher rates between devices. In this dissertation, we propose passive reflection techniques for both use-cases and analyze their performance. In the first part of this dissertation, we propose two novel techniques for ambient backscatter over OFDM carriers. In Chapter 2, we propose an energy-detection based ambient backscatter modulation scheme over OFDM signals, investigate its detector design, and analyze its error performance. In Chapter 3, we propose a frequency shift keying scheme over ambient OFDM signals, investigate its transceiver design, and analyze its error performance. Both techniques allow noncoherent detection and exploit the null subcarriers to alleviate direct link interference. In the second part of this dissertation, we propose three techniques for exploiting RISs in various communications scenarios. In Chapter 4, we investigate the use of RISs to facilitate orthogonal spatial multiplexing in uplink multi-user scenarios and propose a design criterion that achieves this goal. In Chapter 5, we investigate the use of RISs to allow simultaneous communications between multiple user pairs in interference channels and propose a Riemannian manifold optimization approach to solve the problem of configuring the RIS passive reflection coefficients to minimize the total interference under constant modulus constraints. Finally, in Chapter 6, we investigate the use of RISs to maximize the dirty-paper coding rate of an RIS-assisted broadcast channel and propose an alternating optimization technique to optimize both the transmit covariances and the RIS reflections coefficients.
dc.description.departmentElectrical and Computer Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: ElMossallamy, Mohamed A., Miao Pan, Riku Jäntti, Karim G. Seddik, Geoffrey Ye Li, and Zhu Han. "Noncoherent backscatter communications over ambient OFDM signals." IEEE Transactions on Communications 67, no. 5 (2019): 3597-3611.; ElMossallamy, Mohamed A., Hongliang Zhang, Lingyang Song, Karim G. Seddik, Zhu Han, and Geoffrey Ye Li. "Reconfigurable intelligent surfaces for wireless communications: Principles, challenges, and opportunities." IEEE Transactions on Cognitive Communications and Networking 6, no. 3 (2020): 990-1002.; ElMossallamy, Mohamed A., Hongliang Zhang, Radwa Sultan, Karim G. Seddik, Lingyang Song, Geoffrey Ye Li, and Zhu Han. "On spatial multiplexing using reconfigurable intelligent surfaces." IEEE Wireless Communications Letters 10, no. 2 (2020): 226-230.; ElMossallamy, Mohamed A., Zhu Han, Miao Pan, Riku Jäntti, Karim G. Seddik, and Geoffrey Ye Li. "Backscatter communications over ambient OFDM signals using null subcarriers." In 2018 IEEE Global Communications Conference (GLOBECOM), pp. 1-6. IEEE, 2018.; ElMossallamy, Mohamed, Zhu Han, Miao Pan, Riku Jantti, Karim Seddik, and Geoffrey Ye Li. "Noncoherent frequency shift keying for ambient backscatter over OFDM signals." In ICC 2019-2019 IEEE International Conference on Communications (ICC), pp. 1-6. IEEE, 2019.
dc.identifier.urihttps://hdl.handle.net/10657/8080
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectAmbient Backscatter
dc.subjectReconfigurable Intelligent Surfaces
dc.subjectIntelligent Reflecting Surfaces
dc.subjectPassive Reflection
dc.subjectreflectarrays
dc.subjectMIMO
dc.titlePassive Reflection Techniques for Wireless Communications
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2022-12-01
local.embargo.terms2022-12-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentElectrical and Computer Engineering, Department of
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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