The effect of computation and feedback delay on the capacity of multiuser MIMO systems in a small outdoor cell

MW Webb, MR Hunukumbure, MA Beach, AR Nix

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
380 Downloads (Pure)

Abstract

This paper examines how the capacity of three multiuser multiple-input multiple-output (MIMO) algorithms is affected by a delay in computing and feeding back the transmit (and receive) weighting matrices used by the algorithms. Iterative schemes determining transmit weights that achieve the system-wide Nash Equilibrium (NE) or block-diagonalization (BD) of the overall system channel matrix are compared as is a scheme applying successive diagonalization (SD) among users. The NE is found to be far the most robust to out-of-date channel information, whilst SD is found to suffer badly at even the shortest delay considered here (about 0.9ms); BD's losses vary over a wide range depending on the delay. For the two iterative algorithms we also examine the tradeoff between better convergence and less delay. In both cases, the loss in capacity for weaker convergence is very small, and so it is desirable to minimize the delay and thus the capacity loss caused by it
Translated title of the contributionThe effect of computation and feedback delay on the capacity of multiuser MIMO systems in a small outdoor cell
Original languageEnglish
Pages (from-to)1988 - 1992
JournalIEEE 63rd Vehicular Technology Conference, 2006 (VTC 2006-Spring)
Volume4
DOIs
Publication statusPublished - May 2006
Event63rd Vehicular Technology Conference 2006 (VTC 2006-Spring) - Melbourne, Australia
Duration: 1 May 2006 → …

Bibliographical note

ISBN: 0780393929
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Name and Venue of Conference: Vehicular Technology Conference 2006 (VTC 2006-Spring), Melbourne, Australia
Rose publication type: Conference contribution

Additional information: With accompanying conference presentation

Sponsorship: The authors would like to thank the UK EPSRC and Philips Research Laboratories for supporting this work

Terms of use: Copyright © 2006 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference, Spring 2006. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.


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Keywords

  • multiuser multiple-input multiple-output (MIMO) algorithms

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