A Spatial Compatible User Evaluation Algorithm for SDM Broadcast Channels

LANGUAGE
English
SOURCE
Tsinghua Science & Technology Volume 12, Issue 1, February 2007
Published Date:2007-02-01
ABSTRACT
CCI (cochannel interference) introduced by frequency reuse under SDMA (space division multiple access) can be reduced by controlling the frequency sharing according to the users' spatial separability. Highly correlated users in spatial are avoided to be placed into the same spatially multiplexing group. In this paper we propose a user spatial compatibility evaluation criterion based on channel matrix structure analysis. We evaluate the interferences by use of distances between subspaces spanned by users' channel matrixes. Two kinds of subspaces are considered in our analysis, row space and column space. Simulations results showed the row space distance criterion outperformed other ones greatly because it fully utilized the information from users' channel matrixes. When dimensions of users' channel matrixes increase, the matrix structure analysis based criterions showed more effciency.
KEYWORDS
Multiple input multiple output (MIMO), multiuser channel, radio resource management