Alexandra Duel-Hallen

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Recently it was proposed to adapt several transmission methods, including modulation, power control, channel coding and antenna diversity to rapidly time variant fading channel conditions. Prediction of the channel coefficients several tens-to-hundreds of symbols ahead is essential to realize these methods in practice. We describe a novel adaptive long(More)
In wireless communication systems, the direct signal and the reflected signals form an interference pattern resulting in a received signal given by the sum of these components. They are distinguished by their Doppler shifts at the mobile. Once the slowly varying parameters associated with these components are determined, the fading coefficients can be(More)
We compare the performance of suboptimal multiuser detectors for rapidly time-varying fading channels. Disjoint Kalman filters are incorporated in the detector structure to obtain phase and amplitude estimates for coherent detection and multi-access interference cancellation. We also evaluate performance of several multiuser detectors which do not require(More)
Since conventional detector performs poorly in bandwidth-efficient Code Division Multiple Access (CDMA) systems, several multiuser detectors were proposed recently. In this paper, we compare performance of the decorrelator, the two-stage detector (2S), and the decision-feedback detector (DF) for the Rayleigh flat fading synchronous CDMA channel. First,(More)