User ordering and power allocation for optimal multiantenna precoding/decoding

Author

Schubert, Martin ; Boche, Holger

Author_Institution

Fraunhofer Sino-German Lab., Mobile Commun. MCI, Berlin

fYear

2004

fDate

18-19 March 2004

Firstpage

174

Lastpage

181

Abstract

The performance of multiuser beamforming combined with "dirty paper" precoding (downlink) or successive interference cancellation (uplink) depends on the precoding (resp. decoding) order. In this paper we propose an improved algorithm for jointly computing the power allocation and beamformers with minimal total power. Neither matrix inversion nor eigenvalue decomposition is required to compute the global optimum. Then, the optimal precoding order is studied. A fundamental understanding of joint precoding and power allocation will be an important prerequisite for the development of transmit scheduling algorithms

Keywords

antenna arrays; channel coding; decoding; eigenvalues and eigenfunctions; interference suppression; matrix inversion; multiuser channels; radiofrequency interference; scheduling; dirty paper precoding; eigenvalue decomposition; matrix inversion; multiantenna precoding-decoding; multiuser beamforming; optimal precoding order; power allocation; successive interference cancellation; transmit scheduling algorithms; Array signal processing; Base stations; Decoding; Downlink; Interference cancellation; Iterative algorithms; Power control; Signal processing; Signal processing algorithms; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Smart Antennas, 2004. ITG Workshop on

Conference_Location

Munich

Print_ISBN

0-7803-8327-3

Type

conf

DOI

10.1109/WSA.2004.1407665

Filename

1407665