Title :
Prediction error based feedback for downlink transmit beamforming
Author :
Nagaraj, Shirish ; Huang, Yih-Fang
Author_Institution :
Dept. of Electr. Eng., Notre Dame Univ., IN, USA
Abstract :
This paper examines a downlink transmit beamforming scheme we proposed recently (see Nagaraj, S. and Huang, Y.F., Asilomar Conference on Signals, Systems and Computers, 2000). The idea is based on the use of an adaptive channel estimator at the base-station and requires the mobile selectively to feed back the value of the prediction error. This paper proposes a joint maximum-likelihood and set-membership filtering algorithm for adaptive channel estimation that provides robustness against incorrect feedback due to mobile decision errors. The amount of power and bandwidth saving possible with this scheme is quantified via an uplink capacity analysis
Keywords :
adaptive estimation; fading channels; feedback; filtering theory; maximum likelihood estimation; mobile radio; prediction theory; adaptive channel estimation; base station; decision errors; downlink transmit beamforming; fading channels; maximum-likelihood algorithm; mobile radio; power saving; prediction error based feedback; set-membership filtering algorithm; uplink capacity analysis; Array signal processing; Bandwidth; Channel estimation; Computer errors; Downlink; Feedback; Feeds; Filtering algorithms; Maximum likelihood estimation; Robustness;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940272
