(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.
Didn’t really follow it too closely. Key result seemed to be -118 dBm for 90% Pd and -123 dBM for wireless microphone.
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.
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
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.
Read the rest of this entry »
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.
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).
- Identify Means to increase efficiency of system managemenet and operations
- Develop path for gradual non-disruptive evolution of wireless networks
- 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
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.
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.
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)
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.
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.
are now posted online here.
OFCOM announced plans to release white space from TV rebanding in Britain. The key graph:
The first white space will be released early next year in Carlisle, Cardiff and Manchester. Later phases will offer combined spectrum, allowing national services, with the final awards being made in 2011.
Users would be able to decide themselves which technology they use and the licences would be tradeable.
The official OFCOM announcement is here.
Wireless Net DesignLine article on the increasing use of interference avoidance techniques in the 2.4 GHz band.
At the same time as VT’s symposium, Microsoft’s Research Symposium on Cognitive Radio is going on over the 5th and 6th. Papers and presentations are supposed to be published online soon.
An overview of Pentagon efforts to address spectrum issues in Signal Magazine online.
The wireless mic community still doesn’t like unlicensed white space devices (link).
Joe Mitola gave the keynote address this morning at VT’s Wireless Symposum entitled “The Future of Cognitive Radio.”
My brief notes are below the fold. Read the rest of this entry »
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