Projection multiuser detectors for hierarchical cell structures in CDMA cellular systems

Document Type

Conference Proceeding

Publication Date

1-1-2001

Abstract

CDMA-only microcell/macrocell cellular systems have traditionally suffered from the near-far problem in the microcells located near the macrocell boundary. Strong macrocell interference in these microcells disables conventional single user detectors. In this work we present the techniques for multiuser receiver design that address this problem. The pre-processing stage, called the projection stage, which projects the received signal onto the space orthogonal to the subspace spanned by macrocell users' signature sequences, is introduced. It is followed by the stage employing conventional multiuser detection techniques. This class of detectors, called projection multiuser detectors, solves the near-far problem in microcells located at the macrocell boundary, and provides equal treatment to all microcells, regardless of their location within the macrocell. We provide expressions for error probabilities and perform the performance comparison between different projected single user detector and the projected decorrelator.

Identifier

0035184689 (Scopus)

Publication Title

IEEE Vehicular Technology Conference

ISSN

07400551

First Page

1853

Last Page

1857

Issue

53ND

Volume

3

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