Recently, the performance of several linear multiuser receivers including the matched filter receiver, the decorrelator receiver, and the MMSE receiver has been analyzed in CDMA systems with random sequences. Little work has been done for nonlinear decision feedback receiver. In this paper, we extend the results for linear multiuser receivers to an asynchronous CDMA system with an adaptive deci...

Wepresent a comparison between coherent and noncoherent UWB receivers, under a realistic propagation environment, that takes into account also the effect of path-dependent pulse distortion. As far as coherent receivers are concerned, both maximal ratio combining (MRC) and equal gain combining (EGC) techniques are analyzed, considering a limited number of estimated paths. Furthermore, two classi...

By performing the encoding operation on several message packets, rateless coding in cooperative networks has the potential risk of processing information already available to the receivers. In this paper, the intermediate packet decodability of rateless codes is exploited to mitigate such redundant packet processing at the cooperating nodes. The message packets that are already decoded at the r...

In this work we propose adaptive decision feedback (DF) multiuser detectors (MUDs) for DS-CDMA systems using recurrent neural networks (RNN). A DF CDMA receiver structure is presented with dynamically driven RNNs in the feedforward section and finite impulse response (FIR) linear filters in the feedback section for performing interference cancellation. A stochastic gradient (SG) algorithm is de...

We investigate reliable multicast communication over satellite networks. We compare a scenario where receivers can use a feedback channel to signal loss to a scenario where no feedback channel is available. We show that the introduction of a feedback channel is the key to allow for bandwidth-e cient, robust, and fully reliable multicast communication via satellite.

OF THE DISSERTATION Limited Feedback Design for Multiuser Networks By Xiaoyi Liu Doctor of Philosophy in Electrical and Computer Engineering University of California, Irvine, 2017 Professor Hamid Jafarkhani, Chair In this dissertation, the potential of limited feedback in multiuser/multinode networks is explored, and our goal is to design efficient and practical quantizers to mitigate the perfo...

To avoid overloading the Internet and starving TCP connections, multimedia flows using non-congestion controlled UDP need to be enhanced with congestion control mechanisms. In this paper, we present a general framework for achieving TCP-friendly congestion control called MLDA. Using MLDA, multimedia senders adjust their transmission rate in accordance with the network congestion state. For taki...

This paper evaluates a congestion control mechanism for reliable multicast applications that uses a small dynamic set of group members or representatives to provide timely and accurate feedback on behalf of congested subtrees of a multicast distribution tree Our algorithm does not need to compute round trip time RTT from all receivers to the source nor does it require knowledge of group members...