Josep Paradells Aspas

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Bluetooth Low Energy (BLE) is an emerging low-power wireless technology developed for short-range control and monitoring applications that is expected to be incorporated into billions of devices in the next few years. This paper describes the main features of BLE, explores its potential applications, and investigates the impact of various critical(More)
In recent years, wireless sensor and actuator networks have gained high momentum, receiving significant attention from academia, industry, and standards development organizations. One of the primary application domains of this technology is home automation. Wireless home automation networks (WHANs) enable monitoring and control applications for home user(More)
Frequency channels are a scarce resource in the ISM bands used by IEEE 802.11 WLANs. Current radio resource management is often limited to a small number of non-overlapping channels, which leaves only three possible channels in the 2.4GHz band used in IEEE 802.11b/g networks. In this paper we study and quantify the effect of adjacent channel interference,(More)
1 Escola Politècnica Superior de Castelldefels, Universitat Politècnica de Catalunya (UPC), C/Esteve Terradas, 7, 08860 Castelldefels, Spain 2Wireless Networks Group (WNG), Fundació i2cat, C/Gran Capità 2-4, Edifici Nexus I, 2a Planta, Despatx 203, 08034 Barcelona, Spain 3Escola Tècnica Superior d’Enginyeria de Telecomunicació de Barcelona, Universitat(More)
The use of duty-cycling in Medium Access Control (MAC) protocols effectively helps improving the energy efficiency of wireless networks. However, while the benefits of these protocols are unquestionable, most of them still suffer from overhearing and idle listening, two issues that prevent duty-cycled systems from achieving optimum energy usage, which is a(More)
Duty-cycled Medium Access Control (MAC) protocols certainly improve the energy efficiency of wireless networks. However, most of these protocols still suffer from severe degrees of overhearing and idle listening. These two issues prevent optimum energy usage, a crucial aspect in energy-constrained wireless networks such as wireless sensor networks (WSNs).(More)
IEEE 802.11 WLANs (Wi-Fi) are widely deployed for providing Internet access in public spaces, known as Hot Spots. In these scenarios, users tend to be “gregarious” and essentially static. Since association and roaming decisions are made by client devices following signal strength criterions (i.e. a client station selects the AP that provides the strongest(More)
Energy-efficient communication is one of the main concerns of wireless sensor networks nowadays. A commonly employed approach for achieving energy efficiency has been the use of duty-cycled operation of the radio, where the node's transceiver is turned off and on regularly, listening to the radio channel for possible incoming communication during its(More)