Antenna selection and power control in MIMO systems with continuously varying channels

Authors:
Ramakrishna Yellapantula;Yingwei Yao;Rashid Ansari
Affiliations:
Motorola Inc., Libertyville, IL;Department of ECE, University of Illinois at Chicago, Chicago, IL;Department of ECE, University of Illinois at Chicago, Chicago, IL
Venue:
IEEE Communications Letters
Year:
2009

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Abstract

Existing limited feedback methods for Multiple-Input Multiple-Output (MIMO) systems focus largely on block fading conditions whereas, in practice, channels change continuously over time. In this paper, we investigate adaptive transmission over a continuously varying channel (CVC). A combination of Kalman channel tracking, truncated channel inversion (TCI) antenna selection, and power control, is used to achieve bit error rates that are lower than those obtained with existing schemes. Using Kalman filtering for pilot-based channel tracking as well as decision-directed channel tracking, our scheme achieves about 3.6dB gain over the eigen-mode antenna selection scheme and 1.5dB gain over the unitary precoding scheme, when operating at a BER of 10-5.