ViodiTV


Working White Spaces!

Darrin Mylet of Adaptrum demonstrates their white space solution at 2011 NAB. Using TDD OFDMA technology, tunable from 400 to 1,000 MHz, they were able to acheive 94% efficiency on a 6 MHz television channel with aggregated data rate of 11.1 Mbps.

The equivalent transmitter output was less than 1 milliWatt and, using a 0 dBi gain antennas, they were able to transmit 8.8 Mbps downstream and 2.3 Mbps upstream over the 0.8 mile link.  The client station would communicate to the Microsoft database every 40 seconds.  They simulated the addition of a registered microphone on channel 34 and the radios would automatically switch to the next candidate channel, channel 39.  They didn't notice any noticeable disruption in the video streaming and attributed this to the deep play-out buffer of the XBox streaming client software.  

This is an exciting development, as Mylet suggests that the approach they demonstrated could be the, "Next Generation of WiFi."

For more detail on TV white spaces, check out this ScreenPlays Magazine article, which I co-authored.  

http://www.screenplaysmag.com/2011/06/09/tv-%E2%80%98white-space%E2%80%99-is-wild-card-in-next-gen-wireless-strategies/

16 responses to “Working White Spaces!”

  1. […] Working White Spaces White Spaces Demo at NAB […]

  2. Ken Pyle Avatar

    Light Reading Mobile reports that start-up Neul received $12.8M in funding.

    http://www.lightreading.com/document.asp?doc_id=209490&f_src=lrmobiledailynewsletter

  3. […] Perhaps this will be the opening for the next generation WiFi service we reported on in this video interview. […]

  4. Ken Pyle Avatar

    It is official, Microsoft has been added to the FCC’s list of approved database administrators, making for a total of 10 database administrators. Interestingly, their application was approved despite comments from the Engineers for the Integrity of Broadcast Auxiliary Services Spectrum (EIBASS). The way the above demonstration was handled was one reason EIBASS argued that Microsoft shouldn’t be an administrator.

    http://transition.fcc.gov/Daily_Releases/Daily_Business/2011/db0729/DA-11-1291A1.txt

  5. […] Space revolution start – the first white space database trial begins, according to the FCC.  Click here for a demonstration of white […]

  6. […] see a working demonstration of a white space radio, check out this video on ViodiTV. Related Articles:Google’s Larry Page and FCC’s Kevin Martin Laud White Spaces for […]

  7. […] is a mountainous region and wireless will be a challenge.  Perhaps this is an opportunity for white spaces technology using broadcast frequencies.  The Diablo Range blocks the local broadcast signals, so it would be […]

  8. Ken Pyle Avatar
    Ken Pyle

    Good interview with Darren Mylet on Broadband US.TV talks about the challenges of managing spectrum and not having enough granularity in the auction blocks, how incumbents often sit on spectrum and how broadcasters are beginning to embrace white spaces as a way to provide a return path to for their mobile data plans.

    http://www1.tvworldwide.com/events/superwifi/120207/default.cfm?id=14316&type=flv&test=0&live=0

  9. Ken Avatar
    Ken

    The FCC approves and rejects some waivers regarding protection of broadcast frequencies for use as white spaces

    http://transition.fcc.gov/Daily_Releases/Daily_Business/2012/db0601/DA-12-845A1.txt

    Some subtle things, such as a community television channel in Utah that wasn’t previously registered, will impact where and to what extent white spaces will be used, particularly in rural areas.

  10. […]  To see the video demonstration of TV White Spaces that was referenced in the above interview, click here. Related Posts:Femtocell Applications with Rob RiordanProtected: Possible IP Possibilities […]

  11. Ken Avatar
    Ken

    The FCC has approved TV white space database systems (specifically Spectrum Bridge and Telcordia, as they are the only two approved database administrators, to provide service to unlicensed radio devices that operate on unused spectrum in the TV bands (referenced herein as “TV white space devices”) in the East Coast region.

    http://transition.fcc.gov/Daily_Releases/Daily_Business/2012/db1206/DA-12-1956A1.txt

    This follows the FCC’s launch of a microphone venue registration system to allow eligible venues in the East Coast Region to register their microphones.

    http://transition.fcc.gov/Daily_Releases/Daily_Business/2012/db1206/DA-12-1957A1.txt

    From that FCC report:

    “This registration system will enable qualifying major event/production venues across the nation to register with the TV bands white space database systems so that their operations of unlicensed wireless microphones and other low power auxiliary station devices at specified times will be protected from potential interference caused by other unlicensed devices (referenced herein as “TV white space devices”) that also may operate on unused broadcast TV channels.”

  12. Ken Avatar
    Ken

    Google has a very nice tool for searching available spectrum for White Space use at:

    http://www.google.org/spectrum/whitespace/channel/

    This is in its FCC trial phase and is very intuitive. To learn more about it, click here:

    https://support.google.com/spectrumdatabase/#3006419

  13. […] implications. As pointed out in the interview, Google has an interesting way to represent the TV white space opportunity in their recently released spectrum database […]

  14. […] got the heads up that TV white spaces pioneer Adaptrum will soon launch their ACS 2.0 product line, which allows for point-to-point or point-to-multipoint […]

  15. […] see an a video from one of the earliest tests of TV White Spaces (TVWS), click here. Additionally, this article provides more detail of the technology behind TVWS and some of the […]

  16. Ken Pyle Avatar
    Ken Pyle

    This research paper indicates this TV white space approach could be an alternative to other LPWAN technologies https://www.microsoft.com/en-us/research/wp-content/uploads/2016/12/SNOW-sensys2016.pdf

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