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A new approach to power adjustment for spatial covariance based downlink beamforming

 
: Boche, H.; Schubert, M.

:

IEEE Signal Processing Society:
IEEE International Conference on Acoustics, Speech, and Signal Processing 2001. Proceedings. Vol.5: Signal processing education. Sensor array & multichannel signal processing. Audio & electroacoustics : 7 - 11 May 2001, Salt Palace Convention Center, Salt Lake City, Utah, USA
Piscataway: IEEE Operations Center, 2001
ISBN: 0-7803-7041-4
ISBN: 0-7803-7042-2
pp.2957-2960
International Conference on Acoustics, Speech, and Signal Processing (ICASSP) <26, 2001, Salt Lake City/Utah>
English
Conference Paper
Fraunhofer HHI ()
antenna arrays; antenna radiation patterns; array signal processing; cellular radio; covariance analysis; eigenvalues and eigenfunctions; power control; radiofrequency interference; telecommunication control; base-station; cellular system; sinr requirements; power adjustment; steering vectors; beamforming weights; maximum radiated user power; spatial covariance based downlink beamforming

Abstract
When using downlink beamforming at the base station of a cellular system, care must be taken to assure that all users satisfy the given SINR requirements. Generally, this leads to a computationally prohibitive joint optimization problem, therefore decoupled techniques based on eigenvalue decomposition of the spatial covariance have been proposed. However, these techniques require additional power adjustment of the steering vectors in order to satisfy the given SINR requirements. Conventional power control schemes are not suited for this purpose because the SINRs primarily depend on the shape of the radiation patterns. In this paper we propose a new power adjustment algorithm, which adjusts the beamforming weights, such that all users have the same SINR Additionally, it is possible to limit the maximum radiated user power.

: http://publica.fraunhofer.de/documents/N-12871.html