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	<title>Steven J. Crowley, P.E. &#187; Location</title>
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		<title>Experimental Radio Applications at the FCC</title>
		<link>http://stevencrowley.com/2011/02/09/experimental-radio-applications-at-the-fcc-16/</link>
		<comments>http://stevencrowley.com/2011/02/09/experimental-radio-applications-at-the-fcc-16/#comments</comments>
		<pubDate>Wed, 09 Feb 2011 11:33:49 +0000</pubDate>
		<dc:creator>Steven J. Crowley</dc:creator>
				<category><![CDATA[3GPP]]></category>
		<category><![CDATA[3GPP2]]></category>
		<category><![CDATA[4G]]></category>
		<category><![CDATA[Ad-hoc Networks]]></category>
		<category><![CDATA[Antennas]]></category>
		<category><![CDATA[Automotive]]></category>
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		<category><![CDATA[Experimental]]></category>
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		<category><![CDATA[GSM]]></category>
		<category><![CDATA[High Frequency]]></category>
		<category><![CDATA[Land Mobile]]></category>
		<category><![CDATA[Location]]></category>
		<category><![CDATA[LTE]]></category>
		<category><![CDATA[Military]]></category>
		<category><![CDATA[Millimeter-wave]]></category>
		<category><![CDATA[Peer-to-Peer]]></category>
		<category><![CDATA[Propagation]]></category>
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		<category><![CDATA[Radar]]></category>
		<category><![CDATA[Radiolocation]]></category>
		<category><![CDATA[Satellite]]></category>
		<category><![CDATA[Space Communications]]></category>
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		<category><![CDATA[Telemetry]]></category>
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		<category><![CDATA[White Space]]></category>
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		<guid isPermaLink="false">http://stevencrowley.com/?p=1667</guid>
		<description><![CDATA[This summarizes a selection of applications for the Experimental Radio Service received by the FCC during January 2011. These are related to land mobile radio, VHF propagation study, satellite communications, network-centric warfare, TV white space, software defined radio (SDR), military command and control, remotely piloted aircraft, LTE, radio direction finding, OpenBTS, Identification Friend or Foe [...]]]></description>
			<content:encoded><![CDATA[<p>This summarizes a selection of applications for the Experimental Radio Service received by the FCC during January 2011. These are related to land mobile radio, VHF propagation study, satellite communications, network-centric warfare, TV white space, software defined radio (SDR), military command and control, remotely piloted aircraft, LTE, radio direction finding, OpenBTS, Identification Friend or Foe (IFF), peer-to-peer communications, flight test telemetry, automotive telemetry, WiMAX, surveillance radar, vehicle radar systems, and millimeter-wave communications.</p>
<p><span id="more-1667"></span></p>
<p>First, note that the FCC&#8217;s NPRM on changing the experimental licensing rules was <a href="http://edocket.access.gpo.gov/2011/pdf/2011-1377.pdf">published in the Federal Register</a> on February 8. That means the comment deadlines are set. Comments are due March 10, and Reply Comments are due April 11. Consider filing comments in support of <a href="../2010/12/08/%E2%80%9Ctrusted%E2%80%9D-academia-favored-over-industry-in-fcc%E2%80%99s-proposed-experimental-rules/">relaxed rules for industry</a> as well as for academia. A<a href="http://fjallfoss.fcc.gov/ecfs/comment_search/execute?proceeding=10-236&amp;applicant=&amp;lawfirm=&amp;author=&amp;disseminated.minDate=&amp;disseminated.maxDate=&amp;recieved.minDate=2%2F8%2F10&amp;recieved.maxDate=&amp;address.city=&amp;address.state.stateCd=&amp;address.zip=&amp;daNumber=&amp;fileNumber=&amp;submissionTypeId=&amp;__checkbox_exParte=true"> few good comments</a> have been filed already.  I point to the comments of <a href="http://fjallfoss.fcc.gov/ecfs/document/view?id=7021025627">Hans Schantz</a> as exemplary.</p>
<p>On to the applications, which I list in order of frequency:</p>
<ul>
<li>BAE Systems Information and Electronic Systems Integration Inc. filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46816&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112835&amp;x=.">exhibit</a>) for special temporary authority to operate in Wayne, New Jersey on several frequency bands between 27 and 2003 MHz. This is to support development of a more cost-efficient and robust <a href="http://en.wikipedia.org/wiki/Joint_Tactical_Radio_System#JTRS_Ground_Mobile_Radios_.28GMR.29">Ground Mobile Radio</a> system for the Army.</li>
</ul>
<ul>
<li>Raytheon Missile Systems filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46778&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0037-EX-ST-2011&amp;application_seq=46778">exhibit</a>) for special temporary authority to conduct propagation tests in Tucson, Arizona on the following frequencies: 86, 87.5, 87.7, and 87.9 MHz (in the broadcast band). This is to aid in the development of transmission systems on those frequencies. (For a missile company, an unusual band in which to conduct experiments.)</li>
</ul>
<ul>
<li>Michigan Technological University Aerospace Enterprise filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46651&amp;license_seq=47155">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112311&amp;x=.">exhibit</a>) for experimental license to operate on 145.97, 435.52, and 2400.0-2483.5 MHz to support the <a href="http://www.aerospace.mtu.edu/projects/01%20Oculus-ASR/">Oculus-ASR</a> satellite project. The frequencies are for downlink control at 1200 bps, uplink control at 1200 bps, and downlink image data at 230 kbps, respectively. “Oculus-ASR is a nanosatellite currently being developed to aid in the advancement of U.S. Space Situational Awareness as part of the University Nanosatellite Program. The program gives students the opportunity to work with industry sponsors in an effort to construct the best nanosatellite in a nationwide competition, hosted by the Air Force Research Laboratory (AFRL).”</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2011/02/Assembling-the-Oculus.jpg"><img class="aligncenter size-full wp-image-1668" title="Assembling the Oculus" src="http://stevencrowley.com/wp-content/uploads/2011/02/Assembling-the-Oculus.jpg" alt="" width="442" height="302" /></a></p>
<ul>
<li>Carlson Wireless Technologies filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46899&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0066-EX-ST-2011&amp;application_seq=46899">exhibit</a>) for special temporary authority to test a TV white space system using a TV broadcaster’s tower. The intent is to show how white space and broadcasting radios can coexist without objectionable interference. Operation is requested on 174-216 MHz (TV channels 7-13) in Oklahoma City, Oklahoma.</li>
</ul>
<ul>
<li>Harris filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46724&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0022-EX-ST-2011&amp;application_seq=46724">exhibits</a>) for special temporary authority to conduct field testing of software-defined radio (SDR) equipment in Melbourne, Florida on 232.375, 300.375, and 362.250 MHz. The testing will verify line-of-sight communication capabilities of radios ultimately deployed by the military abroad. This testing precedes more stressful at Army test ranges.</li>
</ul>
<ul>
<li> BAE Systems Unmanned Aircraft Programs Inc. filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46722&amp;license_seq=47224">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112718&amp;x=.">exhibit</a>) for experimental license to develop radio link equipment used in the unmanned aircraft systems operated by military branches for command, control, communications, computers, intelligence, surveillance, and reconnaissance  (<a href="http://en.wikipedia.org/wiki/C4ISTAR">C4ISR</a>) applications. More specifically, the testing will involve the testing of a Microhard Systems model <a href="http://www.microhardcorp.com/MHX320.php">MHX320</a> wireless modem at BAE Systems&#8217; factory in Tucson, Arizona. The MHX320 is a 310 to 390 MHz frequency hopping modem, which can be optimized for long distance communications of over 60 miles with throughput up to 230 kbps. Testing will be on 310.0-328.6 and 335.4-390.0 MHz.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2011/02/MHX320a1.jpg"><img class="aligncenter size-full wp-image-1712" title="MHX320a" src="http://stevencrowley.com/wp-content/uploads/2011/02/MHX320a1.jpg" alt="" width="347" height="256" /></a></p>
<ul>
<li>Raytheon Network Centric Systems filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46765&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112578&amp;x=.">exhibit</a>) for special temporary authority to test its Aurora and Wireless IP-capable Network (WIPN) radios, which provide a Mobile Adhoc Network (MANET) data network capability able to provide effective throughput up to 11 Mbps. Operation will be on 420-450 MHz in Fort Wayne, Indiana. This may be related to DARPA’s Mobile Ad-Hoc Interoperable Network GATEway (<a href="http://www.darpa.mil/news/2010/MAINGATEUpdateFinal.pdf">MAINGATE</a>) program, which was initiated to develop systems required to enable network-centric warfare among Coalition and U.S. Forces, as well as to facilitate military operations with non-governmental organizations (NGOs) and first responders.</li>
</ul>
<ul>
<li>Stark Aerospace filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46876&amp;license_seq=47378">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0035-EX-PL-2011&amp;application_seq=46876">exhibits</a>) for experimental license to test a remotely piloted aircraft for public safety and military applications.  Communications from ground to aircraft is by two uplink modes; a primary mode and a backup mode. The primary mode uses the bands 4500-4800 and 4940-4990 MHz. The backup uses the 465-510 MHz band. No information on the downlink is found.</li>
</ul>
<ul>
<li>4 Tech Media filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46598&amp;license_seq=47102">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0561-EX-PL-2010&amp;application_seq=46598">exhibits</a>) for experimental license to conduct white spaces experiments in Washington DC. This work is to be done jointly with District of Columbia government and the Community College of the District of Columbia, and is to investigate the usefulness of available white space spectrum for use in home networking applications.  The network is to consist of 5 base stations and 1,200 access points.  Although the request is for frequencies that span the entire UHF portion (470-698 MHz) of the white space band, only channels permitted for use by FCC rules are to be used. From the exhibits, it appears this experiment is supported by about $30 million of government grants, most by way of the American Recovery and Reinvestment Act.</li>
</ul>
<ul>
<li>Motorola Solutions filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46730&amp;RequestTimeout=1000">application</a> (with associated <a href="https://apps.fcc.gov/els/GetAtt.html?id=112568&amp;x=.">exhibit</a>) for special temporary authority to operate in the 758-768 and 788-798 MHz bands to conduct tests in connection with the development of Long Term Evolution (LTE) broadband equipment. The testing will be conducted from up to three sites near the offices of Motorola Solutions in Schaumburg, Illinois. The requested frequencies encompass both the 758-763 and 788-793 MHz bands known as the upper 700 MHz D block, which has not yet been licensed for regular operation, and the 763-768 and 793-798 MHz public safety block licensed on a nationwide basis to the Public Safety Spectrum Trust.</li>
</ul>
<ul>
<li>Florida Atlantic University filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46405&amp;license_seq=46920">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0542-EX-PL-2010&amp;application_seq=46405">exhibits</a>) for experimental license to operate on 824-849, 880-915, and 1850-1910 MHz in and around Boca Raton, Florida. The intent is to support lab exercises in the College of Engineering and Computer Science. Equipment to be used includes a GSM and a CDMA base station, operating at up to 100 watts effective radiated power. The University says it will coordinate with other licensees, which would include cellular and PCS operators.</li>
</ul>
<ul>
<li>BAE Systems Information and Electronic Systems Integration Inc. filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46877&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112834&amp;x=.">exhibit</a>) for special temporary authority to conduct in-flight calibration and verification of a radio direction finding system on an unmanned aircraft at Victorville, California. Several frequency bands will be used between 880 MHz and 15.35 GHz. This test supports the company’s work for the US Air Force and DARPA.</li>
</ul>
<ul>
<li>The University of California, Berkley, Computer Science Department filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46601&amp;RequestTimeout=1000">application</a> for special temporary authority to operate in support of <a href="http://openbts.sourceforge.net/">OpenBTS</a> technology investigations. Testing would be on 890-915 and 935-960 MHz.</li>
</ul>
<ul>
<li>DRS ICAS, LLC filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46584&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112300&amp;x=.">exhibit</a>) for special temporary authority to test <a href="http://en.wikipedia.org/wiki/Identification_friend_or_foe">Identification Friend or Foe (IFF)</a> interrogator equipment that is being developed under a contract with the Italian Air Force. Operation will be on 1030 and 1090 MHz at Cheektowaga, New York.</li>
</ul>
<ul>
<li>Lockheed-Martin filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46817&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0046-EX-ST-2011&amp;application_seq=46817">exhibits</a>) for special temporary authority to test IFF systems part of a sale to the Royal Saudi Air Force. The system uses the <a href="http://www.lockheedmartin.com/products/TPS77/">TPS-77</a> transportable radar platform. Operation will be on 1030 MHz.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2011/02/TPS-77-02-b.jpg"><img class="aligncenter size-full wp-image-1706" title="TPS-77-02-b" src="http://stevencrowley.com/wp-content/uploads/2011/02/TPS-77-02-b.jpg" alt="" width="308" height="419" /></a></p>
<ul>
<li>Qualcomm filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46824&amp;license_seq=47326">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112726&amp;x=.">exhibit</a>) for experimental license to operate on Cambridge, Massachusetts on 1915-1920 MHz.    Qualcomm is collaborating with faculty and students at MIT to further its testing, validation and application concepts around a peer-to-peer system currently under development. It appears to allow peer-to-peer communications over licensed spectrum without infrastructure support. Qualcomm says the primary objective is to explore creative application ideas which are enabled by this technology, validate system performance, and get feedback on the networking architecture from those studying the subject at MIT. There has been some press attention of this technology at this writing. For better information, a Qualcomm acquaintance has pointed me to this <a href="http://scenic.princeton.edu/ppt/FLQ_Edge.ppt">presentation</a> and to this IEEE magazine <a href="http://www.qualcomm.com/documents/files/toward-proximity-aware-internetworking.pdf">article</a>.</li>
</ul>
<ul>
<li>Boeing filed an application (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0003-EX-PL-2011&amp;application_seq=46621">exhibits</a>) for special temporary authority to operate on 2345?2390 MHz in air-to-ground mode at three locations in Delaware, New Jersey, and Texas.  No further details are publicly available due to a confidentiality request; flight test telemetry is a likely purpose. The Navy is not enthusiastic about the proposal, and the application has yet to be granted.</li>
</ul>
<ul>
<li>Sportvision filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46763&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112577&amp;x=.">exhibit</a>) for special temporary authority to operate an auto race track wireless data system that would allow television viewers to see, displayed on-screen, the real-time location of cars during a racing event. Vehicles equipped with GPS receivers and radios would provide updates every 200 milliseconds. Operation will be on 2395-2400 MHz at 23 motor speedways across the US. Modified Wi-Fi hardware will be used. The requested frequency band is just below the 2 GHz ISM band (high noise levels preclude operation there) and is allocated to the Amateur Radio Service. No interference is expected due to the short duration of operation and low power involved (1 watt). Operation will be coordinated with the ARRL.</li>
</ul>
<ul>
<li>Florida International University filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46669&amp;license_seq=47172">application</a> (with supporting <a href="https://apps.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0013-EX-PL-2011&amp;application_seq=46669">exhibits</a>) for experimental license to operate a WiMAX base station on 2590 MHz in Miami, Florida in support of the <a href="http://www.geni.net/">Global Environment for Network Innovations (GENI)</a> project.</li>
</ul>
<ul>
<li>4-D Security Solutions filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46624&amp;license_seq=47128">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112435&amp;x=.">exhibit</a>) for experimental license to test surveillance radar on 8.75-8.95 and 10.32-10.48 GHz at locations in New Jersey and Wisconsin. The radars to be tested are Elta Systems models <a href="http://www.iai.co.il/34481-40758-en/Groups_ELTA.aspx?btl=1">EL/M-2105</a> and <a href="http://www.iai.co.il/34481-26569-en/Groups_ELTA.aspx?btl=1">EL/M-2129</a>. This testing is in support of the company’s development of homeland security systems intended to provide protection for sensitive installations, borders, and coastlines.</li>
</ul>
<p><a href="http://stevencrowley.com/wp-content/uploads/2011/02/Elta21.jpg"><img class="aligncenter size-full wp-image-1707" title="Elta2" src="http://stevencrowley.com/wp-content/uploads/2011/02/Elta21.jpg" alt="" width="397" height="232" /></a></p>
<ul>
<li>Denso Corporation filed an <a href="https://apps.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=46715&amp;license_seq=47217">application</a> (with supporting exhibits) for experimental license to operate nationwide on 24.125 and 25.5 GHz. Due to a confidentiality request, details of the experimental plan are not publicly available. This experiment is likely related to Denso’s ongoing work developing vehicle radar systems to detect preceding vehicles and obstacles as input to anti-crash and pre-crash systems.</li>
</ul>
<ul>
<li>Battelle filed an <a href="https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=46706&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://apps.fcc.gov/els/GetAtt.html?id=112475&amp;x=.">exhibit</a>) for special temporary authority to operate an experimental point-to-point communications link operating at millimeter-wave frequencies. The link uses optical components to generate and modulate the signals, and has the capability of transmitting 10 Gbps on a 100 GHz carrier. Operation will be at three locations on 95-105 GHz. The proposed study includes investigation of candidate modulation formats at distances up to 1 km.</li>
</ul>
<ul>
<li>ShawnTech Communications filed an experimental application about which nothing is known due to a request for confidentiality. ShawnTech provides <a href="http://www.shawntech.com/services.aspx">phone and related services</a> to the corrections industry. This may be an experiment of cell phone jamming or managed access technology to address contraband wireless devices.</li>
</ul>
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		<item>
		<title>The New York Times&#8217; Slant on Location Services</title>
		<link>http://stevencrowley.com/2010/11/04/the-new-york-times-slant-on-location-services/</link>
		<comments>http://stevencrowley.com/2010/11/04/the-new-york-times-slant-on-location-services/#comments</comments>
		<pubDate>Thu, 04 Nov 2010 13:25:40 +0000</pubDate>
		<dc:creator>Steven J. Crowley</dc:creator>
				<category><![CDATA[Foursquare]]></category>
		<category><![CDATA[Gowalla]]></category>
		<category><![CDATA[Location]]></category>
		<category><![CDATA[Pew]]></category>
		<category><![CDATA[Press]]></category>
		<category><![CDATA[Social Networking]]></category>
		<category><![CDATA[Statistics]]></category>

		<guid isPermaLink="false">http://stevencrowley.com/?p=1337</guid>
		<description><![CDATA[I’m surprised to read in the New York Times that “location services have not caught on.” The number of people using location-based services like Foursquare and Gowalla remains small, and does not appear to be growing, according to a report published Thursday by the Pew Research Center’s Internet &#38; American Life Project. Guess we don’t [...]]]></description>
			<content:encoded><![CDATA[<p>I’m surprised to read in the <a href="http://bits.blogs.nytimes.com/2010/11/04/location-services-have-not-caught-on-report-says/">New York Times</a> that “location services have not caught on.”</p>
<p><em>The number of people using location-based services like Foursquare and Gowalla remains small, and does not appear to be growing, according to a <a href="http://www.pewinternet.org/Reports/2010/Location-based-services.aspx">report</a> published Thursday by the Pew Research Center’s Internet &amp; American Life Project.</em></p>
<p>Guess we don’t have to worry about a spectrum crisis/crunch.</p>
<p>The survey asked 2,065 adult internet users if they “use a service such as Foursquare or Gowalla that allows you to share your location with friends and to find others who are near you.” 5% said yes. In May 2010, that number was 4%. Thus, the Times’ view.</p>
<p>The report also says, however, that the margin of error is +/- 3% for the current number. Pew does not say what the margin of error is from its May survey. Moreover, Pew has no detail on the May survey, in contrast to the current survey, so it is hard to draw a comparison at all. Assuming the May margin of error is the same, a drop from 5% to 4% could instead be an increase from 2% to 7%.</p>
<p>“Location-based services” covers a lot of ground, far beyond social networking, especially in the wireless world. I think Foursquare and Gowalla are more properly called location-based applications.</p>
<p>I’m intrigued by a question Pew uses as a prelude to the above one. They asked 3,001 adults if they use the internet or e-mail. 74% responded yes, compared to 79% in May. Pew has no comment on this, a fairly sharp drop. Kind of like newspaper circulation.</p>
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		<title>Experimental Radio Applications at the FCC</title>
		<link>http://stevencrowley.com/2010/09/08/experimental-radio-applications-at-the-fcc-14/</link>
		<comments>http://stevencrowley.com/2010/09/08/experimental-radio-applications-at-the-fcc-14/#comments</comments>
		<pubDate>Wed, 08 Sep 2010 14:45:02 +0000</pubDate>
		<dc:creator>Steven J. Crowley</dc:creator>
				<category><![CDATA[Ad-hoc Networks]]></category>
		<category><![CDATA[Antennas]]></category>
		<category><![CDATA[Aviation]]></category>
		<category><![CDATA[DTV]]></category>
		<category><![CDATA[Electronic Warfare]]></category>
		<category><![CDATA[Experimental]]></category>
		<category><![CDATA[Land Mobile]]></category>
		<category><![CDATA[Location]]></category>
		<category><![CDATA[Military]]></category>
		<category><![CDATA[Millimeter-wave]]></category>
		<category><![CDATA[Private Radio]]></category>
		<category><![CDATA[Public Safety]]></category>
		<category><![CDATA[Radar]]></category>
		<category><![CDATA[Satellite]]></category>
		<category><![CDATA[Smart Grid]]></category>
		<category><![CDATA[Telemetry]]></category>
		<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[Unlicensed]]></category>
		<category><![CDATA[Video]]></category>
		<category><![CDATA[Wireless]]></category>

		<guid isPermaLink="false">http://stevencrowley.com/?p=935</guid>
		<description><![CDATA[This summarizes a selection of applications for the Experimental Radio Service received by the FCC during August 2010. These are related to radar, military communications, mesh networking, unmanned aerial vehicles, satellite services, biomedical telemetry, aircraft telemetry, safe-driving systems, geophysical sensors, electronic warfare, smart grid, and antenna testing. INOVA Geophysical Equipment Limited filed an application (with [...]]]></description>
			<content:encoded><![CDATA[<p>This summarizes a selection of applications for the Experimental Radio Service received by the FCC during August 2010. These are related to radar, military communications, mesh networking, unmanned aerial vehicles, satellite services, biomedical telemetry, aircraft telemetry, safe-driving systems, geophysical sensors, electronic warfare, smart grid, and antenna testing.</p>
<ul>
<li>INOVA Geophysical Equipment Limited filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45594&amp;license_seq=46061">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0388-EX-PL-2010&amp;application_seq=45594">exhibits</a>) to test a proprietary mobile radio system in the 30-36 MHz and 150-174 MHz bands. The radio links would be used to control remote geophysical seismic <a href="http://www.inovageo.com/products.html">recording equipment</a>, which INOVA manufactures. At the end of testing, INOVA plans to put the radio equipment into production and lease it to customers.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/inova.jpg"><img class="aligncenter size-full wp-image-936" title="inova" src="http://stevencrowley.com/wp-content/uploads/2010/09/inova.jpg" alt="" width="433" height="307" /></a></p>
<ul>
<li>Fortress Technologies filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45531&amp;license_seq=45998">application</a> for experimental license to test several of its secure mesh-networking <a href="http://www.fortresstech.com/Products.aspx">products</a> developed for military applications. Several exhibits are included but they are not publicly available due to a confidentiality request. Operation is to be on 4.9425-4.9875 GHz.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/fortress.jpg"><img class="aligncenter size-full wp-image-937" title="fortress" src="http://stevencrowley.com/wp-content/uploads/2010/09/fortress.jpg" alt="" width="493" height="378" /></a></p>
<p><span id="more-935"></span></p>
<ul>
<li>The Port Authority of New York and New  Jersey filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=45552&amp;RequestTimeout=1000">application</a> for special temporary authority to operate on 5250-5500 MHz while testing to find the best location for an <a href="http://www.israelaerospace.com/34475-34559-en/Groups_ELTA_SystemsSensors.aspx?btl=1">Elta 2127</a> ground surveillance and movement detection radar at JFK Airport. Three similar applications were filed for testing at La Guardia, Newark, and Teterboro  Airports.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/elta.jpg"><img class="aligncenter size-full wp-image-938" title="elta" src="http://stevencrowley.com/wp-content/uploads/2010/09/elta.jpg" alt="" width="369" height="338" /></a></p>
<ul>
<li>General Dynamics Armament and Technical Products filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=45386&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/els/GetAtt.html?id=109122&amp;x=.">exhibit</a>) for special temporary authority to operate on 1760-1850 MHz and 2200-2300 MHz to conduct testing based on Department of Defense requirements for fully-digital data links for small unmanned aircraft systems to allow for higher concentrations of unmanned aerial vehicles (UAVs) operating in the same battle space. A new data link is to be tested. The new data link is compatible with ground based Remote Video Terminals (ROVERs) allowing for real-time reception of video imagery by ground troops.</li>
</ul>
<ul>
<li>Fujitsu Ten Limited filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45480&amp;license_seq=45947">application</a> (with supporting exhibits) for experimental license to operate on 76-77 GHz. The exhibits are not available for viewing, presumably because of a confidentiality request. From other information, this appears to be a test of <a href="http://www.fujitsu-ten.co.jp/english/company/researchdev/gihou/en_pdf/23/23-2.pdf">radar for safe-driving assistance systems</a>. This application was granted on August 27.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/fujitsuten.jpg"><img class="aligncenter size-full wp-image-939" title="fujitsuten" src="http://stevencrowley.com/wp-content/uploads/2010/09/fujitsuten.jpg" alt="" width="493" height="371" /></a></p>
<ul>
<li>Sikorsky Aircraft filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45467&amp;license_seq=45934">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0362-EX-PL-2010&amp;application_seq=45467">exhibits</a>) for experimental license to operate on 30-400 MHz. This is to test <a href="http://www.rockwellcollins.com/products/gov/airborne/cross-platform/comm-systems/radio-comm/vhf-uhf/">Rockwell-Collins AN/ARC-210</a> radios on military helicopters being sold to the United Arab Emirates (UAE). According to the applicant, the “Rockwell-Collins AN/ARC-210 radios will have several unique frequency hopping waveforms which are proprietary to Rockwell-Collins. These waveforms are called TALON and Quicklook waveforms, respectively. The AN/ARC-210 TALON/Quicklook radios will be used aboard the [helicopters] to communicate with UAE ground forces. The Quicklook frequency hopping waveform is used in the 30-90 MHz band. The TALON frequency hopping waveform is used in the 90 to 400 MHz bands.”</li>
</ul>
<ul>
<li>Abbott Diabetes Care filed two applications to test equipment at 433 MHz. The company has requested confidential processing of its application, and few other details are publicly available from the FCC. This may be related to Abbott’s wireless glucose monitoring products. The company <a href="http://www.abbottdiabetescare.com/adc_dotcom/url/content/en_US/30.50:50/general_content/General_Content_0000422.htm">announced</a> in April 2010 that it had supply problems with a wireless product.</li>
</ul>
<ul>
<li>WCA Holdings III, LLC filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=45530&amp;RequestTimeout=1000">application</a> (with associated <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0398-EX-ST-2010&amp;application_seq=45530">exhibits</a>) for special temporary authority to operate on 14.00-14.47 GHz for on-ground and flight testing of a single aircraft earth station antenna. This is to assist with Federal Aviation Administration Supplemental Type Certification testing, as well as further testing and demonstration of the functionality of the antenna with the eXConnect Ku-band Aeronautical Mobile-Satellite Service (AMSS) system. WCA has partnered with Panasonic Avionics Corporation, proponent of the eXConnect System.</li>
</ul>
<p style="padding-left: 35px;">The eXConnect System is Panasonic’s. It is designed for in-flight passenger internet access and other communication services. It can be looked at as a replacement for the now-defunct Boeing Connexion system. <a href="http://presse.lufthansa.com/en/news-releases/singleview/archive/2009/october/12/article/1518.html">Lufthansa</a>, for one, plans to use eXConnect on the majority of its 70 aircraft already fitted with Connexion hardware.</p>
<p style="padding-left: 35px;">This application was received on August 6. On September 1, the application record was updated to note that WCA’s operating partner, Panasonic Avionics Corporation, is in the process of developing a detailed coordination agreement with NASA to protect existing and future Tracking and Data Relay Satellite System (TDRSS) operations from potential interference from Ku-band AES operations. The application was granted on September 7.</p>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/wca.jpg"><img class="aligncenter size-full wp-image-940" title="wca" src="http://stevencrowley.com/wp-content/uploads/2010/09/wca.jpg" alt="" width="650" height="428" /></a></p>
<ul>
<li>Pro Xplor Services filed an application but few details are available due to a request for confidential processing, which FCC staff has asked the company to justify. It also requested a nationwide license, and FCC staff has suggested that a smaller operating area would suffice.</li>
</ul>
<p style="padding-left: 35px;">On July 7 of this year, the FCC <a href="http://www.fcc.gov/Daily_Releases/Daily_Business/2010/db0707/DA-10-1266A1.pdf">denied</a> the company’s request for waiver of the technical rules in Section 90.259 of the Commission’s Rules in order to permit certain proposed secondary telemetry operations.  At the time, it had sought authorization to operate in parts of Arkansas, Louisiana, and Texas on 217/219 MHz frequencies with up to fifteen watts output power on 600-kilohertz and 800-kilohertz channels.</p>
<ul>
<li>INSITU filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=45568&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/els/GetAtt.html?id=109335&amp;x=.">exhibit</a>) for special temporary authority to test the <a href="http://download.harris.com/app/public_download.asp?fid=2101">SeaLancet</a> IP network radio in a flight test on 2367 MHz.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/insitu.jpg"><img class="aligncenter size-full wp-image-941" title="insitu" src="http://stevencrowley.com/wp-content/uploads/2010/09/insitu.jpg" alt="" width="534" height="365" /></a></p>
<ul>
<li>Boeing filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&amp;application_seq=45578&amp;RequestTimeout=1000">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0414-EX-ST-2010&amp;application_seq=45578">exhibits</a>) for special temporary authority to test an <a href="http://en.wikipedia.org/wiki/Electronic_warfare_support_measures">Electronic Support Measures</a> (ESM) system installed on a modified Boeing 767. Operation is to be on 800 MHz, 5.4 GHz, and 9.4 GHz. “The test involves personnel walking around the aircraft with a signal generator and horn antenna directed at the aircraft to stimulate ESM sensors mounted on the aircraft skin.” This application was granted on August 27.</li>
</ul>
<p style="text-align: center;"><a href="http://stevencrowley.com/wp-content/uploads/2010/09/Boeing.jpg"><img class="aligncenter size-full wp-image-962" title="Boeing" src="http://stevencrowley.com/wp-content/uploads/2010/09/Boeing.jpg" alt="" width="377" height="299" /></a></p>
<ul>
<li>Sensus Spectrum filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45577&amp;license_seq=46044">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0385-EX-PL-2010&amp;application_seq=45577">exhibits</a>) for special temporary authority to test Smart Grid devices on 410-430 MHz. Sensus manufacturers similar products on 900 MHz for the US market. The requested frequencies are for testing of devices intended for Europe and the Middle East.</li>
</ul>
<ul>
<li>Lockheed Martin filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45612&amp;license_seq=46079">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0390-EX-PL-2010&amp;application_seq=45612">exhibits</a>) for experimental license to operate on 9.595-9.750 GHz and 10.15-10.43 GHz to operate a ground station used to exchange data with an airborne system. The equipment is said to be an improved version of a system previously delivered to a customer under the US Government Foreign Military Sales for the <a href="http://www.fas.org/irp/program/collect/u-125.htm">Peace Krypton</a> program. According to the Federation of American Scientists, the “mission of the Peace Krypton system program (known internally to Lockheed Martin Corporation as the Eagle program) is to collect reconnaissance imagery of selected areas during long range missions using an airborne Synthetic Aperture Radar (SAR) imagery intelligence collection system.”</li>
</ul>
<ul>
<li>Bowling Green State University filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45668&amp;license_seq=46135">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0399-EX-PL-2010&amp;application_seq=45668">exhibits</a>) for experimental license to use a <a href="http://www.furuno.dk/english/products/catalog/ship-owners-1/navigation-1/marine-radar-1/fr-1525-mk3-1/">Furuno FR-1525Mk3</a> marine radar to track bird and bat activity in areas of existing and planned wind turbine development as well as comparative control sites. Operation will be on 9.3-9.5 GHz.</li>
</ul>
<p><a href="http://stevencrowley.com/wp-content/uploads/2010/09/furuno.jpg"><img class="aligncenter size-full wp-image-942" title="furuno" src="http://stevencrowley.com/wp-content/uploads/2010/09/furuno.jpg" alt="" width="254" height="237" /></a></p>
<ul>
<li>SET Corporation, founded by former DARPA scientists and now a subsidiary of SAIC, filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45704&amp;license_seq=46171">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/ViewExhibitReport.cfm?id_file_num=0408-EX-PL-2010&amp;application_seq=45704">exhibits</a>) for experimental license to operate in and around Denver, Colorado on 35.75 GHz. Details of the proposed test are confidential.</li>
</ul>
<ul>
<li>Raytheon Missile Systems filed an <a href="https://fjallfoss.fcc.gov/oetcf/els/reports/442_Print.cfm?mode=current&amp;application_seq=45687&amp;license_seq=46154">application</a> (with supporting <a href="https://fjallfoss.fcc.gov/els/GetAtt.html?id=109625&amp;x=.">exhibit</a>) for experimental license to test advanced antennas operating in the 80-200 MHz range. The testing will be used to determine three-dimensional far-field radiation patterns of the antennas.</li>
</ul>
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		<title>Ultra-Wideband: How Regulatory and Standardization Delays Slowed a Wireless Technology</title>
		<link>http://stevencrowley.com/2010/09/02/ultra-wideband-how-regulatory-and-standardization-delays-slowed-its-progress/</link>
		<comments>http://stevencrowley.com/2010/09/02/ultra-wideband-how-regulatory-and-standardization-delays-slowed-its-progress/#comments</comments>
		<pubDate>Thu, 02 Sep 2010 14:53:20 +0000</pubDate>
		<dc:creator>Steven J. Crowley</dc:creator>
				<category><![CDATA[DTV]]></category>
		<category><![CDATA[Interference]]></category>
		<category><![CDATA[Location]]></category>
		<category><![CDATA[M2M]]></category>
		<category><![CDATA[Military]]></category>
		<category><![CDATA[Millimeter-wave]]></category>
		<category><![CDATA[Regulatory]]></category>
		<category><![CDATA[Spectrum]]></category>
		<category><![CDATA[Standardization]]></category>
		<category><![CDATA[Ultra-wideband]]></category>
		<category><![CDATA[Unlicensed]]></category>
		<category><![CDATA[Wireless]]></category>

		<guid isPermaLink="false">http://stevencrowley.com/?p=921</guid>
		<description><![CDATA[The FCC recently issued an order denying reconsideration petitions in its ultra-wideband (UWB) proceeding. That effectively ends the 12-year UWB rulemaking process. Mitchell Lazarus recounts how UWB became bogged down at the FCC and in a failed standardization attempt in IEEE 802. UWB, as authorized by the FCC, operates across 3.1 to 10.6 GHz, with [...]]]></description>
			<content:encoded><![CDATA[<p>The FCC recently issued an <a href="http://www.fcc.gov/Daily_Releases/Daily_Business/2010/db0811/FCC-10-151A1.pdf">order</a> denying reconsideration petitions in its ultra-wideband (UWB) proceeding. That effectively ends the 12-year UWB rulemaking process. <a href="http://www.commlawblog.com/2010/08/articles/unlicensed-operations-and-emer/fcc-wraps-up-ultralong-ultrawideband-proceeding/">Mitchell Lazarus</a> recounts how UWB became bogged down at the FCC and in a failed standardization attempt in IEEE 802.</p>
<p>UWB, as authorized by the FCC, operates across 3.1 to 10.6 GHz, with very low power at any one frequency; its tendency to cause or receive interference is very low.</p>
<p>IEEE 802 attempted to create a UWB standard in IEEE 802.15.3a but did not, as neither of two competing proposals reached the necessary voting threshold for approval. One of the competing proposals, Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM), has since seen some consumer success in Wireless USB, which is based on a platform maintained by the WiMedia Alliance; data rates are up to 480 Mbps at a range of about 10 feet.</p>
<p>UWB was eventually standardized in IEEE 802.15.4a, where it exists as an alternative physical-layer to standard IEEE 802.15.4-2006, a standard for very low power, low data rate devices. (The IEEE 802.15.3 family is for higher data rates with higher power consumption.) It uses what was the other competing proposal in 802.15.3a, Direct Sequence UWB (DS-UWB). This standardized form of UWB has been commercialized for asset tracking and other location services, but not yet for consumer applications.<br />
<span id="more-921"></span><br />
As Lazarus says, though UWB is successful in several applications outside the home, it has not made as much progress in the consumer market. A big reason for this is that UWB’s competitors were not so encumbered with regulatory and standardization delays.</p>
<ul>
<li>Standard IEEE 802.11n-2009 (high-throughput Wi-Fi) was approved a year ago with uncoded bit rates up to 600 Mbps in a 40 MHz bandwidth at 2.4 or 5 GHz.</li>
</ul>
<ul>
<li>The Wireless Home Digital Interface (WHDI), which operates in 40 MHz of bandwidth in the 5 GHz unlicensed band, was standardized late last year by the WHDI Consortium. The targeted market is transmission of uncompressed (better-quality) HD video, with data rates up to 3 Gbps. IEEE 802 was not involved, though the technology is similar to 802.11n.</li>
</ul>
<ul>
<li>There are two new millimeter-wave technologies that offer multi-gigabit data rates. These 60-GHz technologies are not direct competitors with UWB, but some overlap in applications could emerge. The data rates are much higher, but 60 GHz is blocked by most any obstruction, and power consumption is high making it unsuitable for mobile devices at this time. As with WHDI, the main market is the transmission of uncompressed HD video.</li>
</ul>
<p style="padding-left: 35px;">WirelessHD operates in the 57-64 GHz unlicensed band and is based on the IEEE 802.15.3c-2009 standard that was published about a year ago. The Wireless Gigabit Alliance is another 60 GHz proponent; its specification is to be based on the IEEE 802.11ad standard, which is under development and should be completed around the end of 2012.</p>
<p>If someone tried to standardize UWB in IEEE 802.15.3 today, they would have a better chance of success due to meeting process improvements. In making decisions in IEEE 802, it has traditionally been one-person, one-vote. That has sometimes motivated companies to send as many as possible to the standards meetings so they can earn voting rights and vote as a block, a practice frowned on by ANSI, IEEE 802’s accrediting body. Since the failure of the UWB standardization in 802.15.3, and because of evidence of block voting in other groups, IEEE 802 has modified its voting procedures to make block-voting harder. Everyone participating in the meetings now has to declare an “affiliation,” the definition of which is carefully worded to lead to the primary entity paying the participant. Consultants, for example, have to declare affiliation with their client, not their consulting firm; they often didn’t do this before. If roll-call votes show evidence of block voting, the group may be switched to entity voting (e.g., one company, one vote). That helps. IEEE 802.20 got bogged down, switched to entity voting, instantly made progress and completed its standard.</p>
<p>With these and further process improvements, IEEE 802 is a good home for these unlicensed standards. One advantage is that all IEEE 802 wireless projects are required to address coexistence with other IEEE 802 wireless standards. That’s hard, as many are using the same spectrum, but the affected groups sometimes can make accommodations with each other to reduce mutual interference. Also, many companies prefer the more-open process of an accredited standards development organization. The decision to go it alone or with a proprietary specification, however, is ultimately a business decision.</p>
<p>UWB remains unique in terms of its interference-resistant characteristics. As more RF devices enter the home, as they will with increased machine-to-machine communications, UWB could help as the more-popular relatively-narrowband devices increasingly interfere with each other. UWB may then become successful in the home out of necessity, if not as an option.</p>
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		<title>Google patent application: Estimating wireless device location using measured data rates</title>
		<link>http://stevencrowley.com/2010/02/01/google-patent-application-estimating-wireless-device-location-using-measured-data-rates/</link>
		<comments>http://stevencrowley.com/2010/02/01/google-patent-application-estimating-wireless-device-location-using-measured-data-rates/#comments</comments>
		<pubDate>Mon, 01 Feb 2010 22:26:05 +0000</pubDate>
		<dc:creator>Steven J. Crowley</dc:creator>
				<category><![CDATA[Location]]></category>
		<category><![CDATA[Patents]]></category>

		<guid isPermaLink="false">http://stevencrowley.com/?p=560</guid>
		<description><![CDATA[Location-based services are reaching beyond navigation and E911. Social networking, advertising, and other emerging applications are driving research and development into better technologies in support of these services, starting with the location estimation process itself. Today, there are several ways to determine the location of a wireless device in a network. As a rough estimate, [...]]]></description>
			<content:encoded><![CDATA[<p>Location-based services are reaching beyond navigation and E911. Social networking, advertising, and other emerging applications are driving research and development into better technologies in support of these services, starting with the location estimation process itself. </p>
<p>Today, there are several ways to determine the location of a wireless device in a network. As a rough estimate, the device knows the identification of the base station or access point with which it is associated. That’s a start, but a base station can cover a wide area. To refine that, devices can use GPS. Networks of cellular base stations can measure differences in the timing or signal strength of an uplink signal, and use the results to estimate location. MAC addresses of Wi-Fi access points can be sniffed and mapped by roving monitors. Sometimes, two or more of these techniques are used in concert.<br />
<span id="more-560"></span><br />
Google adds another technique to the list as described in a January 28 <a href="http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&#038;Sect2=HITOFF&#038;d=PG01&#038;p=1&#038;u=%2Fnetahtml%2FPTO%2Fsrchnum.html&#038;r=1&#038;f=G&#038;l=50&#038;s1=%2220100020776%22.PGNR.&#038;OS=DN/20100020776&#038;RS=DN/20100020776">patent application</a>: mapping packet data rates to distances. Generally, the closer a wireless device is to a base station or access point, the higher the data rate due to the better quality signal. For a particular system and environment, one can create a table mapping different data rates to corresponding distances. The mapped results can then be used to estimate the location of devices relative to each other in the network. If the locations of some devices in the network are known absolutely (maybe a few have GPS), the locations of other devices can be determined absolutely. </p>
<p>As with the other techniques above, the results produced are not exact. The measured data rates can vary not only as a function of distance but also due to other factors including varying propagation conditions, varying transmit power, and interference. Part of the patent covers a method for estimating and assigning an accuracy and confidence level to the results. </p>
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