Re: Open 802.11b wireless access points and remailers
At 11:37 AM 7/27/2001 +0200, Eugene Leitl wrote:
On Thu, 26 Jul 2001, David Honig wrote:
Bear has a point; no matter how you spread or hop, you're an emitter. Shoot anything that radiates from 50 Mhz-IR.
Ultrabroadband is currently hard to triangulate, unless you're part of the network, where TOF mutual triangulation is part of service.
You could triangulate ultrabroadband with an antenna array, but in real life the reflexion and multipath will make it difficult.
In particular see : http://www.aetherwire.com/Aether_Wire/Integrated_CMOS_Ultra-Wideband_Localiz... steve
On Fri, 27 Jul 2001, Steve Schear wrote:
You could triangulate ultrabroadband with an antenna array, but in real life the reflexion and multipath will make it difficult.
In particular see : http://www.aetherwire.com/Aether_Wire/Integrated_CMOS_Ultra-Wideband_Localiz...
True, but even that application requires cooperation on behalf of the sender -- like most such architectures, it uses sliding correlation and agreed upon pseudorandom sequences to get a considerable process gain in the detection stage. Asynch UWB pulses should be considerably more difficult to deal with, although I don't think that multipath will be the reason: UWB pulses are time-localized enough to make direct separation of the directly propagated one from the echoes feasible. Rather I'd think that the asynchrony and the low power requirements for short-range hops would make remote detection troublesome. Still, I'm more a fan of direct sequence spread-spectrum. How easy is it to detect and/or triangulate that when the spreading sequence is not known, is secure, and we can assume the widest bandwidths to date achieved for DSSS? Sampo Syreeni, aka decoy, mailto:decoy@iki.fi, gsm: +358-50-5756111 student/math+cs/helsinki university, http://www.iki.fi/~decoy/front
participants (2)
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Sampo Syreeni -
Steve Schear