Actually, Not true, you mention 802.11, not 802.11b. I have been in a vehicle (3 years ago) crossing cells driving down I95 near Melbourne, FL doing 80Mph without dropping a packet. We were doing this with 802.11 while downloading mail with lots of attachments and surfing the web without a burp and not always with LOS. To be fair, our 802.11 has a patented seamless high-speed roaming that does 20ns switching. They use true time/space antenna diversity (native in the equipment) to assist with the NLOS ability and multipath mitigation. The company was (is) Airwire.net. Now that same vehicle is fitted with a camera that can be panned and zoomed from an Internet connection while mobile at high speed. it is a somewhat famous "rolling billboard" since it is a white Hummer with Airwire.net airbrushed along the side and a plexiglass dome-covered high res camera on the roof and several antennas.
These type networks, by the way have been implemented fairly large scale. We routinely implement these type networks for police and fire departments. This all just part of the great big unlicensed world that that most are not even aware exist...and they do...and they have for several years. Patrick J. Leary Chief Evangelist, Alvarion, Inc. Executive Committee Member, WCA/LEA [EMAIL PROTECTED] Ph: 760.494.4717 Cell: 770.331.5849 Fax: 509.479.2374 -----Original Message----- From: Kevin Lahey [mailto:[EMAIL PROTECTED]] Sent: Friday, December 06, 2002 6:07 PM To: [EMAIL PROTECTED] Subject: [BAWUG] 802.11 at speed? I'm curious about using 802.11 from my car. No less an authority than Jim Thompson explained to me at BAWUG last night that 802.11 was useless when the two communicating systems had a greater than 40-mph speed differential. This is apparently due to the doppler shift. As he pointed out, this wouldn't be a big problem with cars driving past access points, but would make it tough to put a directed antenna pointing down the road, since the cars would close in on it at fairly high speeds. I guess an omni way off the side of the road could provide service for a reasonable distance. Could anybody expand on this for me? I have to admit that I've had visions dancing in my head of in-car access for quite awhile, and I'd hate to think that it was unlikely to work... Thanks, Kevin [EMAIL PROTECTED] -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless ---------------------------------------------------------------------------- ---------------------------------------- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. This footer also confirms that this email message has been scanned for the presence of computer viruses. Any views expressed in this message are those of the individual sender, except where the sender specifies and with authority, states them to be the views of Alvarion Inc. Scanning of this message and addition of this footer is performed by SurfControl SuperScout Email Filter software in conjunction with virus detection software. -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
