Adaptive interference suppression for CDMA systems with a worst-case error criterion

designing FIR fan filters suitable for the multibeam forming network of the wideband beamspace adaptive array. Characteristics were approximated through the combination of spectral transformation and the window method so that those beam patterns that included the sidelobe characteristics of the resulting fan filters were virtually frequency independent. Using the fan filters designed by the proposed method for the multi-beam forming network, we demonstrated by computer simulation the possibility of suppressing wideband interference signals as well as a much faster convergence speed than the conventional Griffiths and Jim beamformer [9]. Wide-band adaptive array processing using pole-zero digital filters, " IEEE Trans. A broadband beam former with pole-zero unconstrained jammer rejection in linear arrays, " IEEE Trans. method of designing two-dimensional complex coefficient FIR digital filters for broadband digital beamforming antennas by a combination of spectral transformation and a window method, " Electron. Commun. The design of two-dimensional digital filters by transformations , " in Proc. 7th Annu. Design of two-dimensional zero phase FIR fan filters via the McClellan transform, " IEEE Trans. Theory and design of broadband sensor arrays with frequency invariant far-field beam patterns , " J. Abstract—This correspondence proposes a novel design strategy for linear multiuser detection in CDMA systems to satisfy a deterministic worst-case error performance measure. Formulations with and without the use of training signals are considered, and a near-far resistant solution for each is presented. Further, computationally efficient adaptive algorithms are derived in this framework that allow for sharing of detectors among different users.