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.
|Original language||English (US)|
|Title of host publication||Conference Record of the 48th Asilomar Conference on Signals, Systems and Computers|
|Editors||Michael B. Matthews|
|Publisher||IEEE Computer Society|
|Number of pages||5|
|State||Published - Apr 24 2015|
|Event||48th Asilomar Conference on Signals, Systems and Computers, ACSSC 2015 - Pacific Grove, United States|
Duration: Nov 2 2014 → Nov 5 2014
|Name||Conference Record - Asilomar Conference on Signals, Systems and Computers|
|Other||48th Asilomar Conference on Signals, Systems and Computers, ACSSC 2015|
|Period||11/2/14 → 11/5/14|
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