2002 International Telecommunications Symposium

"New TDMA overlay packet switching networks such as the General Packet Radio Service (GPRS) and its enhanced mode (EDGE \u2013 Enhanced Data Rate GPRS Evolution) are being deployed for data users. These standards define a number of coding schemes (CS) to be used in accordance with the prevailing radio environment conditions, i.e., interference, noise and...

"We address the problem of joint source symbol detection and multi-channel estimation in time-selective digital communication scenarios. Our approach is based on a statistical model which decouples the time dynamics of the multi-channel vector in amplitude and direction. We compute the most probable emitted symbol sequence and channel realization for...

"We study how 2nd order statistics (SOS) can be exploited in two signal processing problems, blind separation of binary sources and trained-based multi-user channel identification, in a Bayesian context where a prior on the mixing channel matrix is available. It is well known that the SOS of the received data permit to resolve the unknown mixing matrix,...

"The paper presents the architecture of an UMTS terminal equipment for IP based communications, that supports relevant services and takes advantage of traffic control features available in LINUX."

"In this work we discuss the use of a dynamic packet to timeslot assignment (DPA) algorithm combined with a non-linear interference suppression method for a TDMA-based network equipped with an antenna array in the base station. Single and multicell cell scenarios are considered. The whole receiver strategy (combined DPA and non-linear spatial processing)...

"This work aims at investigating the performance of a decoupled space–time processing structure based on a delayed decision-feedback sequence estimator (D-ST-DDFSE), in the context of the enhanced data rates for GSM evolution (EDGE) system. The main idea in using decoupled space-time processing is to separate co-channel interference (CCI) reduction from...

"In this contribution, we present a family of decoupled spacetime (D-ST) equalizers for improved reception in the presence of co-channel interference (CCI) and inter-symbol interference (ISI) in mobile communication systems. Basically, a D-ST equalizer separates CCI and ISI suppression in two processing stages. In the first one, an adaptive array (AA)...

"Second-generation (2G) systems popularized wireless telephony services. Third-generation (3G) systems are expected to enhance 2G systems with high data rates and multimedia capabilities. In this context, EGPRS, the packet data service of the GSM/EDGE Radio Access Network, becomes even more important, due to its 2G compatibility and its capability to...

"In this paper two new adaptive algorithms are presented: Multipath Least-Squares Despread Respread Multitarget Array (MLS-DRMTA) and Multipath Recursive Least-Squares (MRLS) algorithms, in order to improve the performance of adaptive antenna arrays in the presence of multipaths. It is shown from simulation that the diagrams radiation formed with the new...

"To provide Internet Services with much better utilization of frequency spectrum the General Packet Radio Service (GPRS) is integrated in a GSM network. However, some questions to arise about the network performance when these networks are integrated, once that they share the same radio resource of the air interface. Hence, on this article an analytic...