Energy Efficiency Maximization of Full-Duplex NOMA Systems With Improper Gaussian Signaling Under Imperfect Self-Interference Cancellation

• Published in: IEEE communications letters Vol. 26; no. 7; pp. 1613 - 1617
• Main Authors: Abu Mahady, Islam, Bedeer, Ebrahim, Ikki, Salama, Yanikomeroglu, Halim
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bit error rate; Cancellation; Energy efficiency; full-duplex NOMA; Full-duplex system; Improper Gaussian signaling; Interference; Interference cancellation; Maximization; NOMA; Nonorthogonal multiple access; Optimization; Quality of service; Relays; Signaling
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2022.3168233

This work addresses the energy efficiency maximization for a downlink cooperative full-duplex non-orthogonal multiple access (FD-NOMA) system in the presence of imperfect self-interference cancellation. We consider the case where users adopt improper Gaussian signaling (IGS) for their transmission and consequently derive the achievable rate of each link in the cooperative system. We jointly optimize the power allocation at the base-station and the IGS circularity coefficients of the cooperative IGS-based FD-NOMA system to maximize its energy efficiency subject to quality-of-service (QoS) requirements. Furthermore, improper constellation diagrams are designed using the predefined optimized IGS coefficients to study the impact of IGS on bit error rate performance. Simulation results demonstrate considerable energy efficiency performance gain of IGS-based FD-NOMA system over its proper Gaussian signaling (PGS)-based FD-NOMA counterpart under residual interference from imperfect self interference cancellation.