Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Achtzehn, A. Riihijarvi, J. Vargas, G.M. Petrova, M. Mahonen, P. |
| Copyright Year | 2012 |
| Description | Author affiliation: Institute for Networked Systems, RWTH Aachen University, Kackertstrasse 9, D-52072 Aachen, Germany (Achtzehn, A.; Riihijarvi, J.; Vargas, G.M.; Petrova, M.; Mahonen, P.) |
| Abstract | Future wireless networks will be able to exploit unused spectrum whitespaces in the currently underutilized terrestrial TV bands. In order to protect incumbent broadcasting systems from extensive interference from whitespace devices, accurate signal power estimations are needed. Reliable and robust models for predicting the radio propagation in those bands are thus a key enabler of secondary operations. Depending on their level of abstraction and the complexity of the environment, these models can perform quite well, but they require a significant amount of auxiliary information and fine-tuning. Additionally, they usually consider transmitters in one frequency band to have uncorrelated signals, an uncommon scenario in today's digital TV networks where the same geographical area is often served by multiple towers that form a single-frequency network (SFN). Using data from a measurement campaign carried out in a mid-sized Central European city we assess the accuracy of three widely used propagation models in predicting TV signal strengths for configurations of multiple high-power transmitters. We empirically show that the standard deviation of the estimation error is up to 4 dB higher in a multi-transmitter scenarios with correlated signals than in the single-transmitter case. We put the results in contrast to the prediction capabilities of a generic propagation model that estimates pathloss coefficients and individual correction factors from measurements and combines them with information on transmitter locations, power emissions and antenna patterns. Finally, we study the use of spatial statistics based techniques for directly estimating the coverage characteristics without relying on explicit transmitter information. We show that with only a small subset of measurement locations accuracy beyond standard pathloss models can be achieved. |
| Starting Page | 623 |
| Ending Page | 631 |
| File Size | 903468 |
| Page Count | 9 |
| File Format | |
| ISBN | 9781467319041 |
| ISSN | 21555494 |
| e-ISBN | 9781467319058 |
| e-ISBN | 9781467319034 |
| DOI | 10.1109/SECON.2012.6275836 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-06-18 |
| Publisher Place | Korea (South) |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Predictive models TV Standards Radio transmitters Poles and towers Antenna measurements Noise |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|