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A novel multiple input multiple output (MIMO) transmitting scheme is presented for multibeam satellite systems, where the objective is to increase the system sum rate, availability and variance performance.
Research on Multi-User Diversity (MUD) is traditionally carried out from an information-theoretic point of view. Such information-theoretic approaches are feasible in homogeneous systems where all terminals use the same modulation, channel coding, transmission rate, and packet length. In homogeneous systems, the selection of the terminal with highest SNR… (More)
A multibeam satellite scenario is considered along this paper to test for the benefits of dual polarization. Several multiple input multiple output (MIMO) transmitting schemes are proposed to deal with the dual polarization, where the results show that dual polarization is better employed as an interference rejection tool.
In ad-hoc radio networks, mechanisms on how to access the radio channel are extremely important in order to improve network efficiency and, when needed, to guarantee QoS. Traditionally, Medium Access Control (MAC) protocols in ad hoc networks have been designed to face off the well known collision resolution problem. However, when using advanced signal… (More)
In this paper, the problem of resource allocation in multiuser single-antenna wideband OFDM(A) systems is considered from a cross-layer point of view. The main motivation is to show advantages of such systems with respect to narrowband systems. Despite the maximum normalized average throughput is not increased with respect to that in a narrowband system, a… (More)
The paper has two parts: First, we present an overview of the IST WIreless DEployable Network System (WIDENS) Project. This project aims to define an easily deployable communication system to be used by emergency services and public safety in general. In this context, users require a communication system that should not depend on pre-existent… (More)
Traditional works rely on the use of complete Channel State Information (CSI) at the base station to take space-time scheduling decisions in the uplink of multi-user MIMO wireless systems. However, this might be a complex and costly solution. On the other hand, the simplest scheduler is the Round Robin (RR) scheduler that schedules terminals one after the… (More)