Frame-theoretic Designs for Future Wireless Communications

  • Motivated by the historically proven depletion of communication resources, and respectively, by the lack of inherent redundancy necessary for robust and accurate signal processing and identification under orthogonal wireless communications systems, we use in this work over-complete redundant representations, i.e., Frame Theory. To this point, such non-orthogonal signal decompositions provide alternative, yet robust representations, and respectively, aid signal processing of modern and future wireless communications systems beyond the limitations of their traditional orthogonal counterparts. For instance, the millimeter wave (mmWave) initial access (IA) sparse channel estimation and training beamforming optimization problems are reduced to the generic frame design of the measurement matrix for compressed sensing (CS). Similarly, for non-orthogonal multiple access (NOMA) systems, the code-domain NOMA (CD-NOMA) transmission is abstracted as a generic linear model based on the synthesis linear operator of a frame. Under this abstraction, valuable information-theoretic insights regarding the optimum design of CD-NOMA multiplexing schemes are extracted. Albeit different, both problems lead interestingly to common frame design principles based on incoherence, representational tightness and unit-normality frame-theoretic attributes. To provide a full system description, we complement these designs with newly proposed modern signal processing for the sparse recovery of the mmWave channel, or respectively, for the joint multi-user detection (MUD) on the receiving side of a MC-NOMA transceiver. Numerical experiments and software simulations confirm the general theoretic results and highlight, once more, the superiority of the proposed frame-theoretic designs against the existent art.

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Meta data
Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Razvan-Andrei Stoica
Referee:Werner Henkel, George Alexandropoulos
Advisor:Giuseppe Thadeu Freitas de Abreu
Persistent Identifier (URN):urn:nbn:de:gbv:579-opus-1008910
Document Type:PhD Thesis
Language:English
Date of Successful Oral Defense:2019/03/09
Date of First Publication:2019/10/15
Academic Department:Computer Science & Electrical Engineering
PhD Degree:Electrical Engineering
Focus Area:Mobility
Other Countries Involved:Greece
Call No:2019/15

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