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Propagation characteristics, metrics, and statistics for virtual MIMO performance in a measured outdoor cell

Research output: Contribution to journalArticle

Original languageEnglish
Pages236 - 244
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Journal publication dateJan 2011
Volume59
Journal issue1
DOIs
StatePublished

Abstract

Distributing the construction of a multiple-input multiple-output (MIMO) system among more than one mobile user reduces hardware and processing complexity at the terminal end, and may result in improved channel propagation conditions, particularly those related to spatial correlation. In this paper, measured outdoor propagation data is used to study a 4 × 4 virtual MIMO system formed from a two-user 4×4 classical system using only two of the antennas at each constituent user. The capacity, if-factor, and spatial correlation are evaluated for 226 possible pairs of users whose channels were measured while standing and walking. The proportions of pairings that result in a capacity increase and if-factor and correlation reductions over both, only one and neither of the constituents are determined. It is found that correlation reduction appears to be a stronger sign of capacity improvement than is if-factor reduction. When choosing a partner for a given single user, results show that it is easier to improve these three parameters as the user's value of them becomes poorer, so thresholds applicable to this data set are found which specify values of capacity, if, and correlation beyond which at least 50% of possible pairings improve matters.

Additional information

Sponsorship: The authors wish to acknowledge the partners to the Mobile VCE MIMO Propagation Elective for enabling collection of the propagation data, M. Hunukumbure whose analysis was essential groundwork for this study, and K. Stevens for his innovative support of the measurement campaign. Thanks are also due to the anonymous reviewers, whose comments have improved the paper. Terms of use: Copyright © 2011 IEEE. Reprinted from IEEE Transactions on Antennas and Propagation. 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. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • K-factor, capacity, correlation, virtual MIMO

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