Quick Links 3/6/9

Posted in 700 MHz, conferences, quick links, SDRF, white space, white space data group at 10:09 am by JamesNeel

Conferences and Contests

(link) The SDRF sends a reminder that abstracts are due March 20.

(link) The 3rd annual Smart Radio Challenge is now open.

(link) 12th Annual Conference on Modeling, Analysis and Simulation of Wireless Mobile Systems will have a cognitive radio track. It’ll be in the Canary Islands. Key dates:

   Paper submission deadline          April 25, 2009
Notification of acceptanceJuly 5, 2009
Tutorial submission deadline       June 5, 2009
Workshop submission deadline       March 30, 2009

(link) In conjunction with WiOPT09, RAWNET – The 5th workshop on Resource Allocation, Cooperation and Competition in Wireless Networks – is inviting papers on cognitive spectrum management. The conference will be held in Seoul on June 27, 2009. It’s particularly interested in papers related to the cooperation and competition in wireless networks.

Extended submission deadline : March 15, 2009
Notification of acceptance : April 1, 2009
Camera-ready papers due : May 1, 2009 

White Space Related News

(link) WIth some public safety entitites, the CTIA urges ban of secondary access in 700 MHz. Looks mostly focused on clearing out legacy wireless microphones and ensuring that white space devices don’t creep up the spectrum.

(link) NAB is suing to try and block white space devices. This surprising to me as I thought geographic databases and non-adjacency were what MSTV and NAB were looking for. The suit certainly colors my opinion of MSTV and NAB’s efforts viz a viz the white spaces.

(pdf) Stealing a march on the White Spaces Database Group, SpectrumBridge announced the creation of a on online website (ShowMyWhiteSpace.com) to identify available whitespaces by geographical location. It failed for my house, but worked for the White House. (Guess I’m not important enough)

white space database screen capture



Quick Links 9/17/08

Posted in overview, public safety, quick links, white space at 6:32 am by JamesNeel

(link) iTNews (Aussie mag) interviewed Dr Bostian of VT about cognitive radio. Microsoft is also mentioned.

(link) SlashDot also notes the article, where as always, the comments are the most interesting part (particularly if you want a public perspective), e.g.,

“Cognitive radios!?? Oh no you don’t! (Starts adding layers to tin foil hat.)”

(link) The National Cable & Telecommunications Association issued a letter on white space noting potential interference at head ends. They are not arguing against unlicensed white space devices, but would like the following provisions:

  1. Restrict the operation of portable devices to a maximum of 10 mW and prohibit transmissions in the VHF channels given the high probability of direct pickup interference to TV receivers.
  2. Prohibit operations, at a minimum, on channels 2- 4.
  3. Restrict the operation of fixed devices to at least 400 feet from the external walls of residential buildings.
  4. Prohibit operation of fixed devices in VHF channels.
  5. Require spectrum coordination before operation of portable devices on channels adjacent to those being received at headends.

They add:

Of the suggested methods by which fixed and portable devices might automatically determine channel availability, it appears that auto-location (GPS or equivalent), combined with regular access to a reliable database containing geographically-indexed lists of available channels, has the potential to provide the flexibility and reliability required to protect headend reception.


Quick Links (9/13/08)

Posted in conferences, Jobs, quick links, shameless self-promotion at 10:07 am by JamesNeel

(link) CSIRO PhD position on Cognitive Radio in Multi-hop Wireless Networks

(link) AccessNets (Oct 15-19, Las Vegas) will have a panel session on the “Successes of Dynamic Spectrum Management”

(link) The Communication Networks and Services Research Conference has issues a call for papers. Topics include cognitve radio, software radio, ad-hoc networks, Details

  • Dec 5: Submission deadline
  • Feb 9: Acceptance Date
  • May 11-13 Moncton, New Brunswick Conference

(link) Overview of VT’s historical research efforts. Jeff and cognitive radio gets discussed some.


Quick Links 8/26/8 [Updated]

Posted in artificial intelligence, quick links, shameless self-promotion, white space at 10:43 pm by JamesNeel

(link) Shared Spectrum, and Mark McHenry in particular, gets a nice writeup in the WaPo. The politics of unlicensed white space also comes up.

(link) IET Workshop on SDR and Cognitive Radio. It’s in London on the 18th, so I won’t be there. But Keith from CTVR will be. *UPDATE* In the comments, Keith notes that some of the presentations may appear as webcasts at this site.

(link, pdf) On Monday, Oct 27 E3 and the SDR Forum will host a joint workshop on business, exploitation modem architecture, regulation and standardization aspects of SDR and CR. I’m tentatively slotted to give an outbrief on the SDR Forum’s contribution to an ITU report on “Cognitive radio systems in the land mobile service.” (lots of interesting stuff to cover in 30 minutes)

(link) Cognitive radio got some love at the Intel Developers’ Forum. I don’t see the talk in the catalog though.


Quick Links 08/11/08

Posted in conferences, quick links, research initiatives, white space at 10:36 am by JamesNeel

First, contrasting viewpoints on white space testing:

(link) From Shure (after the Redskins / BIlls test):

“The FCC’s tests of prototype white space devices at FedEx field prior to Saturday’s game between the Redskins and the Bills conclusively show that spectrum sensing white space devices will cause harmful interference to wireless microphones during live events. Simply stated, the prototype devices were unable to consistently identify operating wireless microphones or distinguish occupied from unoccupied TV channels. More troubling, the devices failed to detect the presence of wireless microphones when switched on – an occurrence that takes place multiple times during any NFL game.

(link) From Motorola:

In an interview yesterday with FierceWireless, Steve Sharkey, Motorola’s senior director, regulatory and spectrum policy, said that the FCC has just finished most of the outdoor white space device testing and that Motorola’s white space device did very well in the tests. Sharkey said that Motorola uses geolocation technology, which means it uses a combination of location technology (such as GPS) and a database that advises the device on what channel to use and whether or not there is compatibility with other white space devices.”The geolocation approach has proved highly reliable,” Sharkey says.

(link) And Verizon wants white space devices licensed:

“Generally we have favored licensed spectrum,” Tauke said at a press conference, “but we are continuing to look at what the potential may be here.” On the other hand, he said he wanted to be certain that these applications, currently being evaluated by the FCC, don’t interfere with Verizon wireless products or anything else. “Nobody has passed the test” just yet, Tauke said.

My two cents. Applying these sorts of political slants to what should be a purely technical assessment (I have no first hand knowledge of the testing and no particular dog in the fight, but it seems to me they can’t all be right on the assessment) is inherent to decisions related to public goods and is a reason (among many) why I wish we would start transitioning to a regulatory regime that more closely mimicked private property.

(link) Effectively the same Motorola story as above, but this link has a line I want to discuss further.

Sharkey calls the tech “absolute, solid protection,” which should make members of the white space coalition happy — though we haven’t heard positive word from Philips, Adaptrum and InfoComm yet, who were also testing devices alongside Motorola, but aren’t using the geolocation technology. That, and the FCC has the final word on all of this, so we’ll just have to wait for that word from on high before we start riotous, interference free partying in the streets

The emphasis was in the original. There was a paper submitted to DySPAN that I wanted accepted (though not a very good paper and not anyone’s I know so ’twas rejected) which unwittingly made what I think is an important point – if 1) a primary user is turning off and on at unpredefined times and 2) is not helping secondary users (via a beacon or via any other method), then 3) secondary users will have to detect the presence of the primary when it starts transmitting. This then means that you simply can’t have assurances of interference-free operation if you want the secondary system to have any sort of useful throughput.

In practice, this means if we are constrained to detecting wireless mics via detection methods only, we will not be able to guarantee interference-free operation.

On a related note, I think IEEE USA did a real disservice to cognitive radio with their advocacy as it sets up the technology to fail by suggesting an impractical condition is inherent to the concept of cognitive radio.

By definition, CRs should be inherently non-interfering on a completely independent basis.

(link) Keith has done a valuable service and posted site measurements as matlab files on the DySPAN conference site for any researcher to use (mmm… real data). Unfortunately the DySPAN site appears to be down at the moment, so do check back later on this link. *Update* Here’s a direct link (zip).


ISABEL08 still unofficially open for submissions

Posted in conferences, quick links at 10:17 am by JamesNeel

Got an email stating that ISABEL08 is unofficially open for submissions until Aug 10. (I can’t go, it conflicts with the SDR Forum)


Quick Links

Posted in conferences, quick links, white space at 4:48 pm by JamesNeel

(link) The International Symposium on Wireless and Pervasive Computing has issued a call for papers. Related topics include cognitive radio and cooperative communications. It’ll be held from Feb 11-13, 2009 in Melbourne, Australia. Papers are due October 12.

(link) The schedule for the next SDRF meeting / workshop is now posted. The focus of the workshop is “Government and Industry R&D Agendas for Next Generation Radio Technologies” (read as cognitive radio) and Bill Lehr (MIT) will give a talk on “Building the Ecosystem for Commercial Cognitive Radio”. Interestingly, the agenda page (pdf) lists meeting times for a white space task group. (Other than an agreement that it would be a good idea, it hasn’t actually gotten off the ground yet.)

(link) White Space Tests at the DNC and RNC conventions?

(link) The WaPo has a nice article (from yesterday) overviewing the current round of testing. Interestingly, only the Motorola device is aided by geolocation – something I expect to eventually be a requirement. (The WaPo sometimes requires a login, if you’re asked for one, try these.)


Quick Links – July 18, 2008

Posted in military, quick links, regulation, research initiatives, TV Bands, white space at 3:41 pm by JamesNeel

Or all white space, all the time! But first, some non-white space links… 

(link) Call for more dynamic spectrum policies. Not a lot new there for those active in the policy arena. Key graphs:

“Traditionally, spectrum policy has been all about exclusive licensing for specific service, during extended time periods. The considered opinion now is that static long-term licensing of spectrum hinders fast innovation cycles, and across the board. The fact of the matter is that new technologies tend to diffuse faster than regulations, especially in dynamic sectors like telecom. Already, the considerable strides made in digital technology, such as spread spectrum, software defined radio and mesh networks, do call into question the policy of administrative allocation of exclusive-use licenses.

With novel software, coordination amongst service providers in real time can allow umpteen secondary devices to transmit even while providing the right quality of service and non-interference for cellular customers. The bottom line is that we need proactive spectrum policy to fastforward growth of the most desired applications, as they evolve and take off.”

(link) The US Air Force is funding Finnish cognitive radio research. (I don’t know which Finns. I assume CWC @ Oulu, but I don’t see confirmation on their research page)

Officials from the Air Force, Army and Navy are now funding a Finnish research program that explores new approaches for improving telecommunications network management. 

The ultimate goal is to build on this basic research and create a cognitive network that will use rational decision-making methods to improve the speed and quality of information delivered via Defense Department networks.

(link) Ars Technica has a nice overview on the current round of white space testing.

(link – pdf) The current white space test schedule. Note a sports and entertainment venues are on the schedule.

(link) There was a complaint filed with the FCC on interference from unlicensed wireless microphones. Mmmm politics. I thought I went into engineering to avoid that. (FYI, the Public Interest Spectrum Coalition is not completely new as the article implies; they also were active in the 700 MHz block – see link1 & link 2)

A group calling itself the Public Interest Spectrum Coalition (PISC) and the Media Access Project have filed a complaint with the FCC regarding the unlicensed use of wireless microphones. The Media Access Project has filed a proposed “pathway to authorisation” for existing users that would help to protect new public safety and commercial wireless services operating on UHF channels 52-60 from 17 February 2009.

Michael Marcus has much more on this.


White space news / quick links (July 10, 2008)

Posted in quick links, white space at 11:04 am by JamesNeel

Since, procrastinating on starting my paper reviews = blogging, here’s some random white space links / news:

KU issued a press release on their white space testbed here. I didn’t see anything technically useful in the press release which just says the testbed shows that white space devices will not interfere with DTV reception, but there’s no details on the setup. Poking around the KU website, I did find this white paper (pdf) from May 2007, which has some measurement data from that testbed to backup a claim that adjacent channels could be used. But that seems a bit dated.

(link) Sports stadiums have offered their facilities for live testing of white space devices this fall.

(no link – first-hand reporting!) It looks like the SDR Forum (SDRF) will be spinning up a project to develop an analytic model for mobile white space devices. There’s supposed to be an initial phone call in late July to organize the project and based on other discussions, I believe this activity will be run out of the SDRF cognitive radio working group (CRWG) beginning in August.

If it is indeed hosted out of the CRWG, we’re pretty liberal about accepting contributions from non-SDRF members, so even if you’re not in the SDRF, you can participate (though bylaws say you can’t vote nor could you hold a leadership position). 

I’ll post more information about this after the late July phone call.


Quick Links 6/26/08

Posted in companies, conferences, quick links, white space at 9:37 am by JamesNeel

(link) DySPAN demo synopses have been posted.

(link) Omesh is a new (to me) cognitive network spinout from the University of Toronto.

(link) FCC to being field testing of white space devices soon. [Most of the article is about MSTV + Shure vs the WSC]

(link) A press release on the policy / DSA Yuma field trials by Shared Spectrum, Thales, and Harris.