4 documents found, page 1 of 1
Mobile Broadband Systems: Research and Visions
Velez, Fernando J.; Dinis, Manuel; Ferandes, JoséThis article gives an overview of the European research on Mobile Broadband System (MBS), whose features range from WLANs type scenarios, allowing low mobility and medium data rates, up to public cellular MBS, whre high mobility and data rates are foreseen, leading to plain ubiquity. Current trends in 4G systems are described leading to the defintion of the MBS concept. Owing to high transmission data rate and ...
Radio transmission and experimental channel characterisation using an MBS platf...
Mota, Susana; Silva, Adão; Dinis, Manuel; Fernandes, JoséThis paper focuses on results obtained in the ACTS SAMBA project. The project's main objective was the implementation of a Trial Platform providing a full duplex radio link of 34 Mbit/s to prove the technical feasibility with today's technology and to evaluate the main MBS functionality for the public cellular MBS segment. Thus, extensive field trials were carried out in the city of Aveiro, Portugal, in differe...
Desenvolvimento de aplicações para o serviço SMS do GSM
Mónica, Pedro; Oliveira, Pedro; Dinis, ManuelThe SMS service of the GSM has been used in some situations that had not been foreseen when of itsspecification by ETSI. The two applications presented inthis communication are of this an example and are used indomotic and alerting to emergency/robbery system ofautomobiles. The first one allows to the sending of commands through one mobile phone to the existing equipment in house, as well as the consultation of...
Simulador de tráfego para redes móveis via satélite
Tavares, Pedro; Ferreira, José; Dinis, ManuelIn the first part of the paper some mobile satellite communication systems proposed by various entities arebriefly presented, some channel allocation techniques described and the problem caused by handovers in ICO and LEO type constellations is discussed. Afterwards the developed traffic simulator is presented along with various simulation results for a LEO and an ICO type constellation. The simulator permits t...