Results 41 to 50 of about 404,248 (295)

System architecture in cognitive radio networks using a radio environment map [PDF]

Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management, 2011
Cognitive Radio (CR) is considered as a promising solution to improve wireless spectrum utilization. Moreover, through optimization frameworks, Radio Resource Management (RRM) procedures are designed to enhance the efficient utilization of resources in CR networks. To face this issue in a holistic perspective, the RRM solutions should take into account
Vizziello, Anna, Pérez Romero, Jordi
openaire   +2 more sources

Effective Fingerprint Extraction and Positioning Method Based on Crowdsourcing

IEEE Access, 2019
At present, WiFi fingerprinting indoor positioning technology is a research hotspot, and the construction of a radio map based on crowdsourcing can significantly reduce the amount of labor required.
Ning Yu, Shengnan Zhao, Xiaofeng Ma, Yinfeng Wu, Renjian Feng   +4 more
doaj   +1 more source

A Statistical Calibration Method of Propagation Prediction Model Based on Measurement Results [PDF]

International Journal of Electronics and Telecommunications, 2020
Radio environment maps (REMs) are beginning to be an integral part of modern mobile radiocommunication systems and networks, especially for ad-hoc, cognitive, and dynamic spectrum access networks.
Jan M. Kelner, Michał Kryk, Jerzy Łopatka, Piotr Gajewski   +3 more
doaj   +1 more source

Continuum Halos in Nearby Galaxies -- an EVLA Survey (CHANG-ES) -- I: Introduction to the Survey

, 2012
We introduce a new survey to map the radio continuum halos of a sample of 35 edge-on spiral galaxies at 1.5 GHz and 6 GHz in all polarization products. The survey is exploiting the new wide bandwidth capabilities of the Karl G. Jansky Very Large Array (i.
A. W. Strong, Abdo, Allen, Arpad Miskolczi, Azimlu, Baugh, Benjamin, Bregman, Breitschwerdt, Briggs, Calzetti, Chakraborti, Chaves, Condon, Condon, D. J. Saikia, Dale, Dumke, Duric, E. J. Murphy, Ekers, Everett, Everett, Ferrarese, Fraternali, Gebhardt, George Heald, Gissinger, Hanasz, Heald, Howk, Hummel, Hummel, Hummel, Irwin, Irwin, Jayanne English, Jiang-Tao Li, Judith Irwin, Kennicutt, Krause, Krause, Krause, Kronberg, Li, Li, Mac Low, Mao, Marita Krause, Martin, Martos, Megan Johnson, Moskalenko, Moskalenko, Moustakas, Murphy, Murphy, Murphy, Oosterloo, Philip Schmidt, Pohl, Porter, Q. Daniel Wang, R. A. Benjamin, Rainer Beck, Ralf-Jürgen Dettmar, Rand, Rene Walterbos, Richard J. Rand, Richard N. Henriksen, Rossa, Sanders, Satyapal, Schaap, Silvia Carolina Mora, Solanes, Strickland, Strong, Strong, Strong, Strong, Swaters, Tabatabaei, Theresa Wiegert, Tom Oosterloo, Troy A. Porter, Tully, Tüllmann, Wang, Zimmer   +89 more
core   +1 more source

Location-dependent information extraction for positioning [PDF]

, 2012
This paper presents an overview of current research investigations within the WHERE-2 Project with respect to location-dependent information extraction and how this information can be used towards the benefit of positioning.
Agapiou, George, de Celis, Lorena, Denis, Benoit, Dominguez, Jacobo, Laaraiedh, Mohamed, Raspopoulos, Marios, Slock, Dirk, Stavrou, Stavros, Stephan, Julien   +8 more
core   +1 more source

Radio Environment Map Construction Based on Privacy-Centric Federated Learning

IEEE Access
In today’s digital age, coverage prediction is essential for optimizing wireless networks and improving user experience. While numerous path loss models and advanced machine learning algorithms have been developed to achieve high prediction ...
Shafi Ullah Khan, Carla E. Garcia, Taewoong Hwang, Insoo Koo   +3 more
doaj   +1 more source

Radio environment map construction by adaptive ordinary Kriging algorithm based on affinity propagation clustering

International Journal of Distributed Sensor Networks, 2020
In the era of 5G mobile communication, radio environment maps are increasingly viewed as a powerful weapon for the optimization of spectrum resources, especially in the field of autonomous vehicles.
Haiyang Xia, Song Zha, Jijun Huang, Jibin Liu   +3 more
doaj   +1 more source

A deep Chandra observation of the poor cluster AWM4 - II. The role of the radio jets in enriching the intra-cluster medium

, 2010
We use a Chandra observation of the poor cluster AWM4 to map the temperature and abundance of the intra-cluster medium, so as to examine the influence of the central radio galaxy on its environment.
Ascasibar, Bildfell, Brüggen, Burns, Böhringer, Cappellaro, Ciotti, David, De Grandi, Denicoló, Edge, Ewan O’Sullivan, Gastaldello, Giacintucci, Gitti, Grevesse, Hicks, Jan M. Vrtilek, Kaastra, Kalberla, Kirkpatrick, Koranyi, Kuntz, Laurence P. David, Markevitch, Mazzotta, McNamara, Mittal, Nomoto, Nulsen, O’Dea, O’Sullivan, O’Sullivan, O’Sullivan, Peterson, Pipino, Rasia, Rasmussen, Rasmussen, Rebusco, Rebusco, Roediger, Salomé, Sanders, Schombert, Simionescu, Simionescu, Simionescu, Simona Giacintucci, Snowden, Somak Raychaudhury, Vikhlinin, Weisskopf, Werner, Xiang   +54 more
core   +1 more source

The radio source B 1834+620: A double-double radio galaxy with interesting properties [PDF]

, 1999
We present a study of the peculiar radio galaxy B 1834+620. It is characterised by the presence of a 420-kpc large edge-brightened radio source which is situated within, and well aligned with, a larger (1.66 Mpc) radio source.
de Bruyn, A. G., Rottgering, H. J. A., Schoenmakers, Arno P., van der Laan, H.   +3 more
core   +3 more sources

Towards accurate positioning: Directionality-enhanced fingerprinting radio map

ICT Express
The most essential element of location based service is accurate user localization. Considering the existing indoor infrastructure of the internet of things and WiFi access points, along with the widespread use of smartphones by individuals ...
Beomju Shin, Taehun Kim, Taikjin Lee
doaj   +1 more source