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http://dx.doi.org/10.5573/ieie.2014.51.11.033

The Optimal Number of Transmit Antennas Maximizing Energy Efficiency in 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)
Lee, Chungyong (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.51, no.11, 2014 , pp. 33-39 More about this Journal
Abstract
We propose an optimal number of transmit antennas which maximizes energy-efficiency (EE) in multi-user massive multiple-input multiple-output (MIMO) downlink system with the maximal ratio transmission (MRT) precoding. With full channel state information at the transmitter (CSIT), we find a closed form solution by partial differential function with proper approximations using average channel gain, independence of individual channels, and average path loss. With limited feedback, we get a solution numerically by the bisection with approximations in the same manner, and analyze an effect of feedback bits on the optimal number of transmit antennas. Simulation results show that the optimal numbers of transmit antenna getting from proposed closed form solution and exhaustive search are nearly same.
Keywords
MRT; limited feedback;
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