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Carcases F.A.F.,Telematics Wireless | Sanson D.A.R.,Telematics Wireless | Avila D.R.,Ecole Polytechnique Federale de Lausanne | Rizo F.M.,Telematics Wireless
2016 10th European Conference on Antennas and Propagation, EuCAP 2016 | Year: 2016

This paper proposes a printed log periodic antenna with bow-tie arms for wideband applications. A parametric study is performed to optimize the prototype in terms of radiation efficiency, bandwidth and dimensions. The optimized antenna is fabricated and the simulated and measured results are compared. © 2016 European Association of Antennas and Propagation.


Lopez-Aguilera E.,Telematics Wireless | Casademont J.,Telematics Wireless | Villegas E.G.,Telematics Wireless
Wireless Communications and Mobile Computing | Year: 2011

Since the advent of the first IEEE 802.11 standard for WLANs, several papers have been presented that evaluate the IEEE 802.11 DCF access method. In realistic WLAN environments frame errors usually occur due to non-ideal channel conditions; in this way, papers including adverse transmission conditions in the evaluation have been published later in the literature. In this paper, we review existent analytical models that include the influence of transmission errors in IEEE 802.11 DCF performance. We modify current models and provide a more accurate analysis, thus allowing the evaluation in single rate and multi-rate scenarios with stations subject to different link error conditions. Moreover, this paper exposes the unfairness problem that arises in IEEE 802.11 DCF networks with stations subject to different transmission conditions through analytical and simulation results. Stations are not able to distinguish collisions from failed transmissions due to link errors; both result in a missing ACK and, consequently, the transmitting stations apply the exponential backoff algorithm. This fact leads to a lower performance for stations in worse transmission conditions. Copyright © 2010 John Wiley & Sons, Ltd.


Garcia-Villegas E.,Telematics Wireless | Gomez M.,Telematics Wireless | Lopez-Aguilera E.,Telematics Wireless | Casademont J.,Telematics Wireless
IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference | Year: 2010

IEEE 802.11 Wireless LANs (WLANs) are highly sensitive to Denial of Service (DoS) attacks carried out with jamming devices. In this paper we focus on 2.4GHz wideband constant jammers. The interest in the wideband jammer lies in the fact that it beats all possible channels at the same time, leaving no possible escape following traditional channel-switching defenses. After studying and developing an effective detection mechanism, we propose the implementation of a load balancing technique based on cell breathing for mitigating the harmful effects of the jammer over an IEEE 802.11 WLAN. Cell breathing is achieved by dynamically tuning the transmission power to adjust the size of a WLAN cell. © 2010 ACM.


Trademark
Telematics Wireless | Date: 2013-10-14

Electric control panels; Electrical integrated control systems for use in the field of remote control and monitoring of electrical systems and electrical system devices; Lighting control apparatus; Remote control telemetering machines and apparatus; Wireless controllers to monitor and control the functioning of other electronic devices.


A method for retrofitting an existing natural gas line drainage point 100 with a moisture detection capability includes inserting a conducting rod 110 in a previously installed drainage pipe 40 in the drainage point 100, where a lower extremity of the rod 110 may be covered with an insulating material 120, exposing a section of the rod 110 above the insulating material 120, where a lowest point of the section indicates a minimum level of moisture in the drainage point 100 for which status reporting is required, attaching a diagnostic unit 150 to both the drainage pipe 40 and the conducting rod 110 via electric leads 140, the unit including means to provide electric current and diagnose at least one of an electric short and an abrupt change in conductivity, and attaching means for transmitting 160 an indication regarding a status for the drainage point.


Patent
Telematics Wireless | Date: 2015-03-24

An apparatus includes a sleeve for housing at least an antenna of a wireless street lighting control unit and a RF (radio frequency) window. The sleeve is connectable between a luminaire and a lamp pole. The RF window is for said antenna. Alternatively, the antenna is installed externally on top of the sleeve.


Telematics Wireless | Entity website


Telematics Wireless | Entity website

Street Lighting Control Street lighting, one of the most essential services provided by municipal authorities, is a cost and management challenge. New technological advances can deliver up to 50% reductions in energy usage ...


Telematics Wireless | Entity website

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