On Sunday 05 August 2007 20:21:57 Derek Pressnall wrote: > On 8/2/07, Ian Stirling <[EMAIL PROTECTED]> wrote: > > Wolfgang S. Rupprecht wrote: > > > > However, the signals from distant stations still interfere, and increase > > the channel noise level, reducing range. > > With planned networks, this is all managed. > > With unplanned networks, it could in principle auto-configure, but only > > if everyone implements the same fairness protocol. > > I had an idea that may help reduce radio interference in point to > point communications. Lets say if one end (the base) was set up to > broadcast using multiple antennas aranged in some sort of pattern, > with a minimum of 3 antennas. If they were each sending out the same > signal, then each tower's signal will reach a particular handset at a > different time (since the towers are spaced apart). Which means that > each "stream" will have different noise/interference patterns, and the > handset can then process each signal seperately, re-align them in > software and pull out the similaraties and differences in each radio > stream. This way the handset can "focus" on the signal comming from > a particular group of towers and be able to eliminate most of the > noise. > The reverse can be done and the base end -- to pick out a signal > coming from a particular handset, just adjust how it overlaps the > signal streams comming from each tower, and it can focus on a single > handset. > > Not sure how much processing power this would take, or how far apart > the antennas would need to be at the base, but it seams like it would > be an effective way to multiply the number of point-to-point links > that can be established within a given amount of radio spectrum. >
sounds like a cross between mimo and direction finding to me. would be interesting to try it :) _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community