espectro.org.br | Espectro e Redes Comunitárias

Towards unlicensed cellular networks in TV white spaces

Enviado por admin em ter, 21/08/2018 - 10:14

In this paper we study network architecture for unlicensed cellular networking for outdoor coverage in TV white spaces. The main technology proposed for TV white spaces is 802.11af, a Wi-Fi variant adapted for TV frequencies. However, 802.11af is originally designed for improved indoor propagation. We show that long links, typical for outdoor use, exacerbate known Wi-Fi issues, such as hidden and exposed terminal, and significantly reduce its efficiency. Instead, we propose CellFi, an alternative architecture based on LTE.

Burger & Masonta: TV white space for South Africa

Enviado por admin em ter, 21/08/2018 - 08:30

The demand for radio spectrum has continued to grow in recent years. Fortunately, technology has continued to evolve. Modern wireless devices use frequencies up to perhaps 10 GHz, with specialised microwave systems now operating as high as the E-band (around 80 GHz). Even higher frequencies, into the optical band, are being contemplated. This article provides background to the recent developments in policy formulation for TV whitespace wideband networks in South Africa.
Paper by Chris Burger and Dr. Moshe Masonta, CSIR Meraka Institute, attached in PDF.

Presentation: Wireless Networking in White Spaces

Enviado por admin em ter, 21/08/2018 - 08:19

Detailed presentation on the theme by professor Raj Jain, Washington University in Saint Louis.
Source: https://www.cse.wustl.edu/~jain/cse574-14/ftp/j_09wsp.pdf

Open Source PAWS and UHF TV White Space Database Implementation for India

Enviado por admin em ter, 21/08/2018 - 08:10

TV white space (TVWS) geolocation database is being used for the protection of the terrestrial TV broadcast receivers, and the coexistence of secondary devices. To the best of our knowledge, though TV White Space calculations are available, an active online database does not exist for India. In this paper, the development of the first TVWS database for India is detailed and is released for public access. A standardized protocol to access the TVWS database on a readily available hardware platform is implemented.

APC: boletim mensal sobre redes comunitárias e acesso local - jul.2018

Enviado por admin em seg, 20/08/2018 - 12:30

Em anexo está o boletim da APC sobre espectro e redes comunitárias, de julho de 2018. Os boletins mensais da APC com novidades e informações sobre redes comunitárias e acesso local são reproduzidos aqui em formato PDF. Os boletins estão disponíveis apenas em inglês.