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Multi-Sensor Frequency Domain Multiple Access Interference Canceller for DS-CDMA Systems

Gonçalves, L.G. ; Gameiro, A.

European Trans. on Telecommunications Vol. 18, Nº 3, pp. 263 - 273, April, 2007.

ISSN (print): 1124-318X
ISSN (online): 1124-318X

Journal Impact Factor: 0,472 (in 2008)

Digital Object Identifier: 10.1002/ett.1297

Abstract
Direct Sequence Code Division Multiple Access (DS-CDMA) signals exhibit cyclostationary properties
which imply redundancy between frequency components separated by multiples of the symbol rate. In this
paper a Multiple Access Interference (MAI) Canceller (Frequency Shift Canceller (FSC)) that explores this
property is presented. The linear frequency domain canceller operates on the spreaded signal so as to minimise
the interference and noise at the output (Minimum Mean Squared Error Criterium). The performance of
multi-sensor configurations for the cases of beamforming and uncorrelated spatial channels was evaluated
considering both synchronous (UMTS-TDD) and time misalignment systems. The FSC configurations were
concatenated with 2D-PIC structure and evaluated. The simulation results show considerable improvement
relative to the conventional 2D-RAKE and 2D-PIC receiver. A performance close to the single-user RAKE
case was achieved when it was evaluated jointly with 2D-PIC.