2002 International Telecommunications Symposium

"In this paper we propose and test a new modulation strategy to be used in impulse-radio ultra-wide band (IR-UWB) modulation. The use of short-duration pulses to convey information has recently emerged as a powerful alternative to future-generation spread-spectrum wireless systems. The proposed method has shown significant advantages over existing...

"In this paper1, we derived analytical expressions to assess the performance of Time Division Duplexing (TDD) Direct Sequence Code Division Multiple Access (DS-CDMA) systems with coherent bidimensional (2D) Rake receivers. These results are used in the performance comparison between coherent and optimum 2D Rake receivers It is also shown that soft...

"The Multi-Code (MC) multirate DS-CDMA (Direct Sequence-Code Division Multiple Access) transmission system’s performance is analyzed, associated to a Multistage Parallel Interference Cancellation (MPIC) structure, with hyperbolic tangent decision device in the intermediate stages. Extensive Monte Carlo Simulations (MCS) considering total and partial...

"In this paper, we derive the Frequency Reuse Efficiency parameter for multirate systems taking into account the different services and their respective bit rates and QoS requirements. According to the service, this parameter shows a strong variation with high data rates and is nearly constant for lower data rates. An admission control algorithm is then...

"In this paper we describe a rigorous implementation of an UTRA FDD simulator. The simulator strictly abides by the 3GPP standards implementing the detailed transmission chain. We analyze the results of a comprehensive simulation of the UTRA FDD downlink traffic channels. We evaluate the UTRA FDD performance under power control and multiple access...

"This paper shows how performance gain in a mobile radio environment can be achieved by using joint space-time equalization and decoding. We apply different joint procedures with two types of space-time equalization techniques. As a matter of fact, the joint techniques are able to provide a considerable gain with none to small additional computational cost."

"Transmission diversity schemes have been emerging as an attractive solution in order to combine fading effect. Space-time block codes (STBC) with two antennas can provide similar order diversity as maximal-ratio receiver combining (MMRC). In this paper a transmit diversity scheme using STBC with two antennas is applied for EDGE/EGPRS system and its...

"In this paper, a proposal of a medium access scheme with distinction of service classes for Wireless ATM is presented. The proposed protocol uses an efficient scheme of reservation for uplink channels and it allows facility to satisfy the QoS of each service class. The structures of uplink and downlink frames are explained in details. A delay analysis...

"Downlink Beamforming and Power Control are techniques used to improve the capacity or the quality of service in wireless systems. In this paper we propose a fast iterative algorithm for joint downlink beamforming and power control. The performance of this algorithm is compared with decoupled strategies through simulations. Results show that the fast...

"The increasing interest on the possibility of accessing information anytime, anywhere, associated with the development of modern portable equipments, is stimulating the mobile network evolution. This is a gradual evolution, from the firt mobile network generation, 1G, towards the fourth generation, 4G, passing through 2G, 2.5G, and 3G. Higher video,...