Energy-Efficient Precoding for Multiple-Antenna Terminals

Abstract--The problem of energy-efficient precoding is investigated when the terminals in the system are equipped with multiple antennas. Considering static and fast-fading multiple-input multiple-output (MIMO) channels, the energy-efficiency is defined as the transmission rate to power ratio and shown to be maximized at low transmit power. The most interesting case is the one of slow fading MIMO channels. For this type of channels, the optimal precoding scheme is generally not trivial. Furthermore, using all the available transmit power is not always optimal in the sense of energy-efficiency [which, in this case, corresponds to the communication-theoretic definition of the goodput-to-power (GPR) ratio]. Finding the optimal precoding matrices is shown to be a new open

• Type: Journal
• Year: 2010
• Where: CORR
• Authors: Elena Veronica Belmega, Samson Lasaulce
• Keywords: CORR 2010, Education, Low Transmit Power, Optimal Precoding, Transmit Power