Abstract
This paper addressed the energy-efficient resource management problem of an amplify-and-forward relay-assisted bidirectional relay system under a quality-of-service (QoS) constraint. The objective is to develop a holistic resource management algorithm for joint implementation of relay selection, power adaptation and bit-rate management for optimal energy efficiency (EE). A three-stage approach is proposed to solve the energy-efficient resource management problem. At stage 1 (stage of power management), a per-subcarrier energy-efficient problem is investigated, leading to a power adaptation algorithm for maximizing the system EE and ensuring the required level of the system QoS. Within the framework of the power adaptation algorithm and by exploiting spatial diversity of multiple-relay channels, distributed relay selection is investigated at stage 2 (stage of relay management). Next, the bit-rate management problem is tackled at stage 3, namely assigning bit rate to different subcarriers to maximize the system EE further. Finally, summarizing the results achieved at the three stages, a novel EE technology combined with relay selection, bit-rate management and power adaptation is developed. Simulation results validated the correctness and the efficiency of the proposed algorithm. It is shown that the proposed algorithm can significantly reduce the total transmit power of the system while ensuring the required system QoS.
Highlights
Cooperative relaying utilizes additional relay nodes to assist information delivery between sources and destinations and can enlarge wireless communication coverage, combat channel fading and enhance received signal strength [1, 2]
Much attention has concentrated on a three-node cooperative relaying scenario, called as bidirectional relaying (BDR) [3], where two sources want to deliver information to each other via a cooperative relay node
Within the framework of the power adaptation algorithm and by exploiting spatial diversity of multiple-relay channels, distributed relay selection is investigated at stage 2
Summary
Cooperative relaying utilizes additional relay nodes to assist information delivery between sources and destinations and can enlarge wireless communication coverage, combat channel fading and enhance received signal strength [1, 2]. Ji et al J Wireless Com Network (2021) 2021:136 the research community, a great deal of research attention has been paid to developing effective physical-layer relaying and transmission techniques for achieving energy efficiency (EE). A BDR system (BDRS) can employ either an amplify-and-forward (AF) relay or a decode-and-forward (DF) relay and adopt the time division broadcast (TDBC) or the multiple-access broadcast (MABC) transmission styles [4]. In case that an AF relay node is employed, the MABC transmission style would be adopted because it requires less number of channel uses for one cycle information delivery between the two sources. If a DF relay node is used, the TDBC transmission style is preferred since the sources’ transmitted signals are separated by different time slots or frequency bands and benefits the decoding at the relay sides
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: EURASIP Journal on Wireless Communications and Networking
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
