Frugal channel tracking for transmit beamforming

Pacific Grove, CA（2014）

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摘要

Channel state feedback is a serious burden for transmit beamforming systems with many antennas in FDD mode. Instead of estimating the channel at the receiver and feeding back quantized beamformer information, a different approach that exploits the spatio-temporal correlation of the channel is proposed. The transmitter periodically sends a beamformed pilot signal, while the receiver feeds back the quantized innovation derived from either a Kalman filtering or a MAP tracking loop. Simulations show that close to optimum performance can be attained with only 2 bits per channel dwell, clearing a hurdle for transmit beamforming with many antennas in FDD mode.

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关键词

Kalman filters,MIMO communication,antenna radiation patterns,array signal processing,channel estimation,frequency division multiplexing,maximum likelihood estimation,radio receivers,radio transmitters,transmitting antennas,FDD mode,Frugal channel tracking,MAP tracking loop,MIMO transmit antenna,channel state feedback,frequency division duplex mode,maximum a posteriori estimation,quantized beamformer,receiver channel estimation,spatio-temporal correlation,transmit beamforming,transmitter Kalman filtering

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