title: Space-time adaptive decision feedback neural receivers with data selection for high-data-rate users in DS-CDMA systems.
abstract: A space-time adaptive decision feedback (DF) receiver using recurrent neural networks (RNNs) is proposed for joint equalization and interference suppression in direct-sequence code-division multiple-access (DS-CDMA) systems equipped with antenna arrays. The proposed receiver structure employs dynamically driven RNNs in the feedforward section for equalization and multiaccess interference (MAI) suppression and a finite impulse response (FIR) linear filter in the feedback section for performing interference cancellation. A data selective gradient algorithm, based upon the set-membership (SM) design framework, is proposed for the estimation of the coefficients of RNN structures and is applied to the estimation of the parameters of the proposed neural receiver structure. Simulation results show that the proposed techniques achieve significant performance gains over existing schemes.
authors.affiliation: Communications Research Group, Department of Electronics, University of York, Heslington, York YO105DD, North Yorkshire, UK. rcdl500@ohm.york.ac.uk
authors.forename: Rodrigo C
authors.initials: RC
authors.lastname: de Lamare
authors.forename: Raimundo
authors.initials: R
authors.lastname: Sampaio-Neto
mesh_terms: D000465:Algorithms; D003195:Computer Communication Networks; D003198:Computer Simulation; D003657:Decision Making; D005246:Feedback; D016247:Information Storage and Retrieval / Q000379:methods*; D008962:Models, Theoretical; D016571:Neural Networks, Computer; D010363:Pattern Recognition, Automated / Q000379:methods; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications