Lattice MMSE single user receiver for asynchronous DS-CDMA systems [articol]

Abstract

This paper considers a lattice Minimum Mean-Squared Error (MMSE) single user adaptive receiver for the asynchronous Direct Sequence – Code Division Multiple Access (DS-CDMA) system. It is based on the Gradient Adaptive Lattice (GAL) algorithm. Since the lattice predictor orthogonalizes the input signals this algorithm achieves a faster convergence rate than the transversal counterpart, the Least Mean Square (LMS) adaptive algorithm, paying with an increased computational complexity. Superior performances are obtained by adapting the tap weights several times during each bit interval.