Deakin University
Browse

File(s) under permanent embargo

Opportunistic beamforming with single beamforming matrix for virtual antenna arrays

journal contribution
posted on 2011-03-01, 00:00 authored by Jinho ChoiJinho Choi
Opportunistic beamforming is a promising technique for downlink channels in cellular systems. When opportunistic beamforming is to support multiple users at a time, it is important to form multiple beams with as little interference as possible. In the conventional approach with limited feedback of channel state information from users, the best beamforming matrix can be selected from a set of multiple beamforming matrices. Thus, at each time when a different set of users are selected by a scheduler, a new beamforming matrix has to be found, which may require excessive complexity. To avoid this problem, in this paper, we propose an opportunistic beamforming approach with a single fixed beamforming matrix for stationary users. Since the beams are fixed, we only need to perform user selection (and power allocation if necessary). It is also shown that the proposed approach is suited for a distributed virtual antenna array built by multiple base station or access point units, since the intercorrelation between the users' channel vectors in this case allows effective opportunistic beamforming based on user classification in conjunction with a single beamforming matrix.

History

Journal

IEEE transactions on vehicular technology

Volume

60

Issue

3

Pagination

872 - 881

Publisher

Institute of Electrical and Electronics Engineers

Location

Piscataway, N.J.

ISSN

0018-9545

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, IEEE