On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Power allocation games for MIMO multiple access channels with coordination
IEEE Transactions on Wireless Communications
Introducing hierarchy in energy games
IEEE Transactions on Wireless Communications
On the capacity achieving covariance matrix for Rician MIMO channels: an asymptotic approach
IEEE Transactions on Information Theory
On the Outage Probability of a Multiple-Input Single-Output Communication Link
IEEE Transactions on Wireless Communications
Multiple-antenna channel hardening and its implications for rate feedback and scheduling
IEEE Transactions on Information Theory
MIMO channel modeling and the principle of maximum entropy
IEEE Transactions on Information Theory
A game-theoretic approach to energy-efficient power control in multicarrier CDMA systems
IEEE Journal on Selected Areas in Communications
Non-Atomic Games for Multi-User Systems
IEEE Journal on Selected Areas in Communications
A repeated game formulation of energy-efficient decentralized power control
IEEE Transactions on Wireless Communications
Energy Efficient Wireless Networks Towards Green Communications
Wireless Personal Communications: An International Journal
Energy-Efficient Resource Allocation in Mobile Networks with Distributed Antenna Transmission
Mobile Networks and Applications
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One of the main objectives of this paper is to provide an information-theoretic answer on how to maximize energy-efficiency in MIMO (multiple input multiple output) systems. In static and fast fading channels, for which arbitrarily reliable communications are possible, it is shown that the best precoding scheme (which includes power allocation) is to transmit at very low power (Q → 0). Whereas energy-efficiency is maximized in this regime, the latter also corresponds to communicating at very small transmission rates (R → 0). In slow fading or quasi-static MIMO systems (where reliability cannot be ensured), based on the proposed information-theoretic performance measure, it is proven that energy-efficiency is maximized for a non-trivial precoding scheme; in particular, transmitting at zero power or saturating the transmit power constraint is suboptimal. The determination of the best precoding scheme is shown to be a new open problem. Based on this statement, the best precoding scheme is determined in several special but useful cases. As a second step, we show how to use the proposed energy-efficiency measure to analyze the important case of distributed power allocation in MIMO multiple access channels. Simulations show the benefits brought by multiple antennas for saving energy while guaranteeing the system to reach a given transmission rate target.