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Same cell co-channel interference reduction using multiple spatially distributed adaptive array systems

Authors
Journal
Signal Processing
0165-1684
Publisher
Elsevier
Publication Date
Volume
81
Issue
10
Identifiers
DOI: 10.1016/s0165-1684(01)00091-3
Keywords
  • Distributed Adaptive Array
  • Adaptive Beamforming
  • Interference Reduction

Abstract

Abstract In this paper, a method is proposed whereby the interference between multiple co-channel users can substantially be reduced, compared to conventional arrays located in the cell center. The proposed technique employs planar multi-angle user discrimination. This is achieved by means of a distributed antenna array system, consisting of three antenna sub-arrays whose centers are spaced far apart compared to the operating wavelength. The sub-arrays are located at the edges of a regular hexagonal cell. Although the proposed configuration can be used in both the up- and down-link, this paper deals with the up-link only. Utilizing the least mean squares technique, the steering vector is optimized for the complete array to yield the best signal to interference ratio for all the co-channel users in the same cell. The signal to interference performance of the proposed system is compared to conventional antenna array systems, located at the center of a cell.

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