The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a study of underground wave propagation in dielectrics. We have determined the influence of the impurities of the propagation medium, of the polarization of waves and the effect that reflections have on the transmitted power. As the antennas as borholed in cavities, we have also presented the influence of the dimensions of the drilled cavity and the role of the medium that fills it.
In this paper we propose a software module for continuously monitoring a wireless network card, able to handle and rise IEEE 802.21 compatible primitives in support for vertical handover in heterogeneous networks. This module is intended to be installed on a multimod mobile terminal, and will automatically monitor and switch the connection link, when performing vertical handover. Besides the software...
In this paper we describe the architecture and implementation details for a software system supporting session mobility at application level, based on standard SIP protocol. The target of our work is to build a more complex reconfigurable system with support for vertical handover in hybrid wireless networks. The presented system is a step toward this goal, providing a media session mobility solution...
This paper presents some results regarding performance improvement obtained by using turbo encoding technique in conventional and optimal multiuser detector in ideal and non-ideal receiving conditions. The results, expressed as bit error rate as a function of signal to noise ratio, have been obtained after extensive simulations for different encoding polynomials, different decoding algorithms and...
The paper describes the main issues regarding the interoperability between some representative wireless access networks and the corresponding vertical handover in wireless hybrid access networks. The proposed approach conforms to the IEEE 802.21 media independent handover (MIH) standards.
The paper is analyzing the radio propagation effects in cavities and the interaction with a second type of media, with other dielectric properties. The radiated power is theoretically analyzed and some numerical results are presented.
In this paper we described the generic design of software interoperability modules for vertical handover in wireless hybrid access networks. The proposed approach conforms to the IEEE 802.21 Media Independent Handover (MIH) standard and fits into our architecture for reconfigurable interoperability of wireless communication systems, RIWCoS. The next step of our work will be the implementation of concrete...
The present work aims to illustrate the improvement that turbo encoding / decoding algorithms can bring to a multiuser detection system, evaluated in terms of bit error rate (BER). Extended simulations have been performed for conventional multiuser detection algorithms and are still under study for other algorithms, like the optimal, the MMSE and the classical MMSE ones. Simulations have been performed...
This paper aims to present the results that can be obtained with a conventional multiuser detector used in conjunction with turbo encoding in order to improve its performance, evaluated in terms of bit error rate (BER) as a function of signal to noise ratio (SNR). We used extensive Monte Carlo simulations, taking into consideration different combinations with respect to the number of users, the cross-correlation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.