Graduation Year

2023

Document Type

Dissertation

Degree

Ph.D.

Degree Name

Doctor of Philosophy (Ph.D.)

Degree Granting Department

Electrical Engineering

Major Professor

Hüseyin Arslan, Ph.D.

Co-Major Professor

Gökhan Mumcu, Ph.D.

Committee Member

Kwang-Cheng Chen, Ph.D.

Committee Member

Ismail Uysal, Ph.D.

Committee Member

Dmitry B. Goldgof, Ph.D.

Committee Member

Javad Abdoli, Ph.D.

Keywords

6G, interference, non-orthogonal multiple access, rate-splitting

Abstract

The growing interest in diverse wireless applications such as virtual reality (VR), digital twin, ultra-massive broadband communication (u-MBB) has led the cellular industry to look for new multiple accessing schemes and new signal processing techniques for utilization of next-generation wireless technologies. Throughout the PhD duration, different studies are performed in regards to dual-functional and interference robust multiple accessing and control of electromagnetic radiation for cognitive radio systems. Firstly, a novel concept on non-orthogonal multiple access (NOMA), which is the coexistence of different waveform structures in the same resource elements is proposed. Secondly, a novel JCR waveform is proposed to serve both communication and radar applications with the same resources. Thirdly, rate-splitting (RS) in OFDM waveform is investigated. It is shown that even in single-input single-output (SISO) BC scenario, the proposed OFDM-RSMA outperforms OFDM-NOMA and OFDMA in diverse channel conditions. Finally, the formation of smart radio environment is introduced considering efficient utilization of radio spectrum in any given geographical area, which can be also viewed as a generalization of cognitive radio technology.

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