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http://dx.doi.org/10.5573/ieie.2015.52.8.003

Optimization Algorithm for Energy-Efficiency in the Multi-user Massive MIMO Downlink System with MRT Precoding  

Lee, Jeongsu (Department of Electrical and Electronic Engineering, Yonsei University)
Han, Yonggue (Department of Electrical and Electronic Engineering, Yonsei University)
Sim, Dongkyu (Department of Electrical and Electronic Engineering, Yonsei University)
Lee, Chungyong (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.8, 2015 , pp. 3-9 More about this Journal
Abstract
Under the maximum transmit power constraint and the minimum rate constraint, we propose the optimal number of transmit antennas and transmit power which maximize energy-efficiency (EE) in multi-user multiple-input multiple-output (MIMO) downlink system with the maximal ratio transmission (MRT) precoding. Because the optimization problem for the instantaneous channel is difficult to solve, we use independence of individual channel, average channel gain and path loss to approximate the objective function. Since the approximated EE optimization problem is two-dimensional search problem, we find the optimal number of transmit antennas and transmit power using Lagrange multipliers and our proposed algorithm. Simulation results show that the number of transmit antennas and power obtained by proposed algorithm are almost identical to the value by the exhaustive search.
Keywords
MRT;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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