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Adaptively adjusting system parameters including bandwidth, transmit powerand mode to maximize the "Bits per-Joule" energy efficiency (BPJ-EE) in thedownlink MIMO systems with imperfect channel state information at thetransmitter (CSIT) is considered in this paper. By mode we refer to choice oftransmission schemes i.e. singular value decomposition (SVD) or blockdiagonalization (BD), active transmit/receive antenna number and active usernumber. We derive optimal bandwidth and transmit power for each dedicated modeat first. During the derivation, accurate capacity estimation strategies areproposed to cope with the imperfect CSIT caused capacity prediction problem.Then, an ergodic capacity based mode switching strategy is proposed to furtherimprove the BPJ-EE, which provides insights on the preferred mode under givenscenarios. Mode switching compromises different power parts, exploits thetradeoff between the multiplexing gain and the imperfect CSIT caused inter-userinterference, improves the BPJ-EE significantly.

Improving Energy Efficiency Through Multimode Transmission in the Downlink MIMO Systems