Title :
A Low Complexity Energy Efficiency Maximization Method for Multiuser Amplify-and-Forward MIMO Relay Systems With a Holistic Power Model
Author :
Xingyu Zhou ; Bo Bai ; Wei Chen
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In this letter, we investigate the energy efficiency (EE) maximization problem in multiuser amplify-and-forward (AF) MIMO relay systems with a holistic power model. A low complexity EE maximization method is proposed to jointly select the active antennas and the user, as well as optimize the transmission power of the user and relay. More specifically, the active antennas at the relay are selected by a norm-based scheme. We also propose a low complexity iteration scheme based on fractional programming, which can efficiently solve the pseudo-concave problem, in order to select the user and optimize the transmission power. Simulation results show that the proposed low complexity method enjoys a probability of 99% to hit the optimal EE obtained by exhaustive search. Moreover, it has an average gain of 42% in the EE over the conventional AF MIMO relay protocol.
Keywords :
MIMO communication; active antennas; amplify and forward communication; concave programming; iterative methods; probability; protocols; relay networks (telecommunication); AF MIMO relay protocol; EE maximization problem; active antenna selection; fractional programming; holistic power model; low complexity energy efficiency maximization method; low complexity iteration scheme; multiuser amplify-and-forward MIMO relay systems; norm-based scheme; pseudo-concave problem; transmission power optimization; Complexity theory; MIMO; Optimization; Relays; Signal to noise ratio; Transmitting antennas; Energy efficiency; MIMO relay; amplify-and-forward; antenna selection; user selection;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2329863