Energy Efficiency Analysis of Two-Way DF Relay System With Non-Ideal Power Amplifiers

• Published in: IEEE communications letters Vol. 18; no. 7; pp. 1254 - 1257
• Main Authors: Qimei Cui, Tianpeng Yuan, Xiaofeng Tao, Dowhuszko, Alexis A., Jantti, Riku
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Applied sciences; Exact sciences and technology; Integrated circuit modeling; Joints; Lead; Optimization; Power demand; Relays; Resource management; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; decode-and-forward relays; Two-way relay transmission; energy efficiency; non-ideal power amplifiers; Relay; Transmission protocol; Downlink; Transmission time; Optimization; Energetic efficiency; Numerical simulation; Routing protocols; Delay time; Power amplifier; Uplink
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2014.2327632

The energy efficiency (EE) problem of a two-way decode-and-forward relay system with three nodes is studied. The maximization of the EE is done by jointly optimizing the transmission time and power of each node, assuming non-ideal power amplifiers (PAs) and considering that data to be delivered is delay constrained. Theoretical analysis and numerical results show that the joint optimization of both parameters provides better EE than the equal allocation of time with independent optimization of transmission power. Moreover, it is observed that the use of non-ideal PAs and the increase in the downlink-to-uplink data ratio decrease the EE of the relay system under study.