A cross-layer approach to energy efficiency for adaptive MIMO systems exploiting spare capacity

Hongseok Kim, Chan Byoung Chae, Gustavo De Veciana, Robert W. Heath

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)


In this paper, we propose a mechanism to switch between multiple-input multiple-output (MIMO) with two transmit antennas and single-input multiple-output (SIMO) to conserve mobile terminals' energy. We focus on saving uplink RF transmission energy of mobile terminals in cellular systems supporting best effort traffic. The key idea is to judiciously slow down transmission rates when a base station is underutilized. We show that there exists a crossover point on the transmission rate below which SIMO consumes less power than MIMO when circuit power is included. The crossover point is an increasing function of the circuit power, the number of receive antennas and channel correlation, all of which increase the potential energy savings resulting from mode switching. We propose an adaptive mode switching algorithm combined with rate selection to maintain a user's target throughput while achieving energy efficiency. Extensive flow-level simulations under dynamic loads confirm that the proposed technique can reduce the transmission energy by more than 50% and enables an effective tradeoff between file transfer delay and energy conservation.

Original languageEnglish
Article number5200986
Pages (from-to)4264-4275
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number8
Publication statusPublished - 2009 Aug

Bibliographical note

Funding Information:
This work was presented in part at CISS 2008, Princeton, NJ. This work was supported in part by a gift from the Intel Research Council, NSF CNS-0721532, Samsung Electronics and NSF CCF-514194, CNS-626797. Digital Object Identifier 10.1109/TWC.2009.081123

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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