Adaptive Interference Suppression for CDMA Systems using Interpolated FIR Filters with Adaptive Interpolators in Multipath Channels

Provided by: Cornell University
Topic: Mobility
Format: PDF
In this paper, the authors propose an adaptive linear receiver structure based on interpolated Finite Impulse Response (FIR) filters with adaptive interpolators for Direct Sequence Code Division Multiple Access (DS-CDMA) systems in multipath channels. The interpolated Minimum Mean-Squared Error (MMSE) and the interpolated Constrained Minimum Variance (CMV) solutions are described for a novel scheme where the interpolator is rendered time-varying in order to mitigate Multiple Access Interference (MAI) and multiple-path propagation effects. Based upon the interpolated MMSE and CMV solutions they present computationally efficient Stochastic Gradient (SG) and exponentially weighted Recursive Least Squares type (RLS) algorithms for both receiver and interpolator filters in the supervised and blind modes of operation.

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