A Downlink Tracking Algorithm by Adapting the Beamspace Weights of the Transmit Antenna

Author

Hussain, S.S.I. ; Sheikh, M.I.

Author_Institution

Univ. of Eng. & Technol., Lahore

fYear

2007

fDate

11-12 April 2007

Firstpage

1

Lastpage

6

Abstract

A simple gradient algorithm for adaptation of complex base band beamspace weights of the transmit antenna at the base station by feedback from the mobile is presented. In order to converge to the optimal beamspace weights this beamspace beamformer relies on a single feedback bit from the mobile user. Here the ingenious idea is that the feedback bit indicates which of the two normalized perturbed beamspace weights of the base station array delivers more power to the mobile. Utilizing this feedback, our algorithm at the base station updates the complex beam space weights of the transmit beamformer. It converges to the optimum beam space weights for a static channel, which is confirmed by simulations.

Keywords

antenna arrays; gradient methods; transmitting antennas; base station; beamspace beamformer; complex base band beamspace weights; downlink tracking algorithm; gradient algorithm; mobile user; static channel; transmit antenna; transmit beamformer; Adaptive arrays; Antenna arrays; Array signal processing; Base stations; Downlink; Feedback; Mobile antennas; Signal processing algorithms; Space stations; Transmitting antennas; adaptive beamforming; antenna array; beamspace processing; stochastic gradient algorithm; transmit beamforming;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering, 2007. ICEE '07. International Conference on

Conference_Location

Lahore

Print_ISBN

1-4244-0893-8

Electronic_ISBN

1-4244-0893-8

Type

conf

DOI

10.1109/ICEE.2007.4287349

Filename

4287349