Energy-efficient resource management for OFDM modulated bidirectional relaying with quality-of-service constraint

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 holistic algorithm for joint implementation selection, power adaptation and bit-rate optimal energy efficiency (EE). A three-stage approach proposed solve problem. At stage 1 (stage management), per-subcarrier investigated, leading maximizing EE ensuring required level QoS. Within framework by exploiting spatial diversity multiple-relay channels, distributed selection investigated at 2 management). Next, tackled 3, namely assigning bit rate different subcarriers maximize further. Finally, summarizing results achieved three stages, novel technology combined with developed. Simulation validated correctness algorithm. It shown that can significantly reduce total transmit while