07.25.08

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.)

07.23.08

Site notes July 23, 2008

Posted in Uncategorized at 9:05 am by JamesNeel

Or hey, why doesn’t my link to post x work anymore?

Short version: Upgraded to wordpress 2.6. Old permalinks to posts with a date format are broken, everything else should be fine (links are there, just a different format for the url).

Long version: Noticed that yahoo (the host) wasn’t automatically upgrading wordpress as they were supposed to and there was some weird stuff showing up in search engine crawls (background). So I used the wordpress widget to automatically upgrade the site and virtually everything broke. After a bunch of manual php and sql editing, I think everything is back to its quasi-normal state, except for the permalinks whose format I had to change. The permalinks will appear normal if you’re clicking through from this site, but old external links will be broken because of the format change.

(This is apparently not an uncommon problem, nor one I could find a fix for. So if you know of a fix for permalinks and yahoo hosted wordpress 2.6, leave a comment. FYI, as a “feature” yahoo eats the .htaccess file whose editing wordpress suggests for other hosts.)

07.18.08

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.

07.10.08

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.

06.26.08

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.

06.19.08

White Space Workshop Panel Session

Posted in conferences, spectrum, white space at 7:45 pm by JamesNeel

Notes below the fold.

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Peter Tenhula (Shared Spectrum)

Posted in conferences, white space at 7:00 pm by JamesNeel

Notes below the fold.

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Monisha Ghosh (Phillips)

Posted in Uncategorized at 6:29 pm by JamesNeel

Notes below the fold

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Ser Wah OH, I2R (Singapore)

Posted in research initiatives, white space at 5:45 pm by JamesNeel

Didn’t really follow it too closely. Key result seemed to be -118 dBm for 90% Pd and -123 dBM for wireless microphone.

Notes from Lary Alder (Google) at White Space Workshop @ SDRF

Posted in TV Bands, white space at 5:15 pm by JamesNeel

Notes below the fold

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Notes from (Randy Ekl) Mot0rola at White Space Workshop @ SDRFR

Posted in Uncategorized at 3:00 pm by JamesNeel

Notes below the fold

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Notes from (Paul Greenis) Adapt4 at White Space Workshop @ SDRF

Posted in cognitive pilot channel, devices, TV Bands, white space at 2:47 pm by JamesNeel

Notes below fold

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1900.5 – Maybe policy languages won’t kill the radio star

Posted in cognitive standards, language at 2:22 pm by JamesNeel

One of the things I harp on a lot is the impracticality of DARPA’s xG policy ontology solution as it has an unbounded order of complexity (see Table 13.1 in B. Fette, Cognitive Radio Technology). So I’ve been mostly ignoring the language standardization efforts (e.g., 1900.5 til now and MLM in the SDRF) because I thought they were never really going to get deployed.  

At the SDR Forum meeting in Portland, 1900.5 held a couple sessions, which I wasn’t originally too keen to sit in on and only ended up attending because a public safety sig CR session got canceled. While the actual session devolved into a ”what is a language?” exercise in intellectual onanism as I expected, I ended up speaking some with John Strassner (the lead on 1900.5) afterwards.

In addition to recommending a nice salmon dish, he said his vision for 1900.5 is a policy language that can be compiled and implemented on a radio. If that works out (and John seems to have the background for this to happen), then policy reasoning should be feasible to do in real-time on practical radios and my entire opinion of the utility of policy languages will have to change.

This was apparently the goal all along for the group, so perhaps I should’ve known this, but I previously had a very low opinion of the potential utility of a policy language so I wasn’t following closely – which I’ll have to change.

Notes from TDK RF Solutions (instead of Carl Stevenson from 802.22)

Posted in TV Bands, white space at 1:31 pm by JamesNeel

Didn’t find very much interesting in this talk. Kinda high level view of what cognitive radio is and the associated regulations (there was a nice summary slide of all the FCC activities with SDR, CR, and white space devices). 

Basic point is CR will be important, but it’s not easy, and regulations will be changing over time.

Question: John (Vanu) asks how you do interference measurements for new devices using radically different devices. TDK suggests you work with all parties and find ways to make them happy with the testing

Notes from Bruce (MSTV) at White Space Workshop @ SDRF

Posted in cognitive pilot channel, TV Bands, Uncategorized, white space at 1:24 pm by JamesNeel

Unfortunately wordpress ate my post and this was where I was taking my notes, so highlights from memory (take the numbers with a grain of salt). It’s really a shame as it was quite a detail-rich presentation. I might supplement this later after I get a copy of the slides.

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Notes from the White Space Workshop @ SDR Forum in Portland

Posted in TV Bands, white space at 12:10 pm by JamesNeel

Probably going to be a long post, so it’s below the fold. Typed in real time, so forgive the fact that there’ll be more typos than usual.

Kicked off by John Chapin (Vanu, Chair SDRF) – noted rapid projected growth in spectrum demand (an extra 500 MHz required under 5 GHz perhaps in the next 15 years). I’ll try to gather my notes from each talk in a different post.

06.18.08

E3 Overview

Posted in cognitive pilot channel, research initiatives at 6:03 pm by JamesNeel

Sometime ago, I mentioned I didn’t really know what was going on in E3 (End-to-End Efficiency), but today Eric Nicollet gave a briefing.

Goal: Introduce cognitive wireless systems into the beyond 3G world. Does indeed build directly on E2R and follows up. December 2009. Total budget 18.6 million euros (11 million from EU).

Intended outcomes:

  1. Identify Means to increase efficiency of system managemenet and operations
  2. Develop path for gradual non-disruptive evolution of wireless networks
  3. Make an initial design

Really keying on cognitive pilot channel (I’ll have something up on that maybe next week). They dedicated a maybe 3 minutes out of 15 just to CPC with everything else programmatic.

Main use cases: dynamic spectrum access and allocation, distributed RRM, self organizaing networks

Comment:

I was always disappointed with E2R because it seemed to focus on developing a systems-of-systems model without actually defining / developing the algorithms that would run in the systems. Hopefully, this will change in E3.

Random notes from the SDR Forum General Meeting

Posted in conferences, military, research initiatives at 3:56 pm by JamesNeel

The following came up during today’s SDR Forum General Meeting downselected to those things which were new / news to me.

SCORED (Software and COgnitive Radio for European Defense)

An overview is given in this presentation (pdf). Appears to combine Thales, INDRA, SELEX, and Ericsson with a primary focus on SDR with the hopes of adapting the SCA for use for European applications. CR architecture appears to be building on E2R architecture. It started in 2007.

NTIA DSA Coordination Group – generally keeps NTIA informed of DSA technology developments (can’t find a link, but it is mentioned on this site which means half of CRT knew of it even if the other half didn’t)

Peter Tenhula noted the # of short some spectrum lease arrangements were actually down in the most recent quarter (27 as opposed to 32). Spectrum Bridge may have entered the market too early, but then again it might pick up during the 700 MHz build-out.

26 FCC IDs for SDR have now been granted (as of June 2008). Of interest, new ones were granted to Aruba and Trango using DFS for ISM / UNII bands presumably on WiFi devices.

Some unspecified government cognitive radio R&D project in Japan is supposed to start up (and specify details?!?) in July 2008. A similar situation is apparently occuring in Korea. If I hear something more concrete, I’ll post links.

06.17.08

Google suggests wireless mics should switch to CDMA

Posted in shameless self-promotion, TV Bands, white space at 9:23 am by JamesNeel

Google has a combative white paper up arguing that wireless mics should switch to CDMA (with cognition to adapt spreading codes). Here’s a direct link to paper (pdf)

My comments:

1) I don’t think implicitly arguing that wireless mics should switch to spread spectrum will advance the white space cause. Comes across as a bait (no interference to legacy systems!) and switch (legacy systems must change!).

2) I think you can get very close to what Google wants with pseudo-noise codes or fast frequency hoppers as opposed to adaptive codes which could have some significant stability issues with 300+ uncoordinated adapting mics all in close vicinity unless done right.

3) I do think it would be a good thing to use digital spread spectrum mics instead of analog mics, but Google (and this applies to me as well) is the wrong one to be making the case. Because of the messenger, it’ll likely slow the transition.

06.12.08

SDR Forum Tutorials

Posted in conferences, shameless self-promotion at 6:16 pm by JamesNeel

Tomorrow’s news today!

Notifications of tutorial selections haven’t gone out yet (not due until the 18th), but the lineup of SDR Forum Tutorials is posted here. I’m currently slated to give a tutorial on analyzing cognitive radio networks Monday morning.

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