World Library  
Flag as Inappropriate
Email this Article

Open spectrum

Article Id: WHEBN0000249388
Reproduction Date:

Title: Open spectrum  
Author: World Heritage Encyclopedia
Language: English
Subject: Radio spectrum, Wireless grid, DySPAN, Radio resource management, Lawrence Lessig
Collection: Radio Resource Management, Radio Spectrum, Wireless Networking
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Open spectrum

Open spectrum (also known as free spectrum) is a movement to get the Federal Communications Commission to provide more unlicensed radio-frequency spectrum that is available for use by all. Proponents of the "commons model" of open spectrum advocate a future where all the spectrum is shared, and in which people use Internet protocols to communicate with each other, and smart devices, which would find the most effective energy level, frequency, and mechanism.[1] Previous government-imposed limits on who can have stations and who cannot would be removed,[2] and everyone would be given equal opportunity to use the airwaves for their own radio station, television station, or even broadcast their own website. A notable advocate for Open Spectrum is Lawrence Lessig.

National governments currently allocate bands of spectrum (sometimes based on guidelines from the ITU) for use by anyone so long as they respect certain technical limits, most notably, a limit on total transmission power. Unlicensed spectrum is decentralized: there are no license payments or central control for users. However, sharing spectrum between unlicensed equipment requires that mitigation techniques (e.g.: power limitation, duty cycle, dynamic frequency selection) are imposed to ensure that these devices operate without interference.

Traditional users of unlicensed spectrum include cordless telephones, and baby monitors. A collection of new technologies are taking advantage of unlicensed spectrum including Wi-Fi, Ultra Wideband, spread spectrum, software-defined radio, cognitive radio, and mesh networks.[3]

Contents

  • Radio astronomy needs 1
  • See also 2
  • References 3
  • External links 4

Radio astronomy needs

Astronomers use many radio telescopes to look up at objects such as pulsars in our own Galaxy and at distant radio galaxies up to about half the distance of the observable sphere of our Universe. The use of radio frequencies for communication creates pollution from the point of view of astronomers, at best, creating noise or, at worst, totally blinding the astronomical community for certain types of observations of very faint objects. As more and more frequencies are used for communication, astronomical observations are getting more and more difficult.

Negotiations to defend the parts of the spectrum most useful for observing the Universe are mostly carried out by the international astronomical community, as a grassroots community effort, coordinated in the Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science.

See also

References

  1. ^ "Radio_Revolution_The_Coming_Age_of_Unlicensed_Wireless" (PDF). werbach.com. Retrieved 2008-02-26. 
  2. ^ "NEWS LINKS". openspectrum.info. Retrieved 2008-02-26. 
  3. ^ "Open Spectrum: A Path to Ubiquitous Connectivity". acmqueue.org. Retrieved 2008-02-26. 

External links

  • Open Spectrum FAQ
  • Open Spectrum UK
  • Open Spectrum Alliance (public interest, non profit) which pushes for open spectrum at EU level and national level in the EU
  • David P. Reed's Open Spectrum resource page
  • Committee on Radio Astronomy Frequencies - includes list of frequencies useful for looking at the Universe
  • Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science (IUCAF)
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.