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On Mobility-Supporting Transmit Beamforming in MISO FDD Wireless Systems  

Lee, Woo-Kwon (Department of Electrical Engineering, University of Arkansas)
Sepko, Brian J. (Department of Electrical Engineering, University of Arkansas)
Publication Information
Journal of Communications and Networks / v.10, no.3, 2008 , pp. 308-315 More about this Journal
Abstract
When operating in frequency-division duplex (FDD) mode, transmit beamforming in multiple-input single-output (MISO) wireless communication systems typically requires accurate knowledge of downlink channel state information (CSI) at the transmitter. In practical FDD systems, obtaining such downlink CSI at the transmitter is challenging, if not impractical. To circumvent such challenge and support user mobility, we present a new method for transmit beamforming based on simple beam-control commands (BCCs) in MISO FDD mobile systems. We then numerically evaluate the effects of BCC errors in terms of transmit power efficiency, system capacity, and outage probability.
Keywords
Beam control command; frequency-division duplex; multiple-input single-output; transmit beamforming;
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