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Technology Stocks : Qualcomm Incorporated (QCOM) -- Ignore unavailable to you. Want to Upgrade?

To: Maurice Winn who wrote (24339)	3/17/1999 3:40:00 PM
From: Sawtooth	Read Replies (1) \| Respond to of 152472

Thanks for the electrified rant, Maurice. Superior form, as usual. I see you immediately found the page with all the bells, whistles, ribbons in motion and the technical jargon ; no surprise! Now we'll see if others answer your call on whether this has properties of being the dinkum oil, or not. Regards.

To: Maurice Winn who wrote (24339)	3/17/1999 3:56:00 PM
From: Bux	Read Replies (1) \| Respond to of 152472

Thanks for the link Maurice! Interesting indeed. The timing of pulses to a billionth of a second though? Imagine the problems of a moving transmitter when relying upon such small time scales. Loran navigational systems use the precise timing of transmissions from two or more synchronized transmitters of known locations to determine position. Various atmospheric conditions can disrupt the expected timing of these signals and cause a boat to be charted on an inland journey. And Loran doesn't even require timing to a billionth of a second, it is old technology. How does Time Domain propose to compensate for time-drift? I noticed in their extensive list of applications, they didn't say "mobile voice and data." I think your investment in Qualcomm is secure for at least a few more years. No need to stock up on sherry (yet). It does sound like a good investment though. I wonder when they will offer an IPO? Perhaps the recent web presence is a precursor to an IPO.

To: Maurice Winn who wrote (24339)	3/17/1999 4:18:00 PM
From: Clarksterh	Read Replies (1) \| Respond to of 152472

Maurice - I suppose we shouldn't worry because we have a time to market advantage, their silly Gaussian monopoles breach the laws of physics. No, not so far as I can tell, but neither do they offer many of the phenominal improvements over CDMA as they want to suggest: 1) They provide their extra user capacity by spreading over a much wider bandwidth than CDMAOne. If CDMAOne chose to spread over the same range then they would have comparable performance. 2) They boast of having undetectable power out. Well, no duh! With one low data rate user being spread over 2GHz of course it is undetectable. Now try loading it up to 1000 users. Hey, how come everyone's TV signal is screwed up?! 3) The result of 3 is going to be that they will need to be band limited, or they will need to limit the system to only a few users. If they make it band-limited they lose their biggest advantage - cheap transmitters and receivers - and of course they won't be able to accomodate 1000 users. There is no free lunch in frequency utilization. However, they may have some advantages: 1) Cheap transmitters and receivers, but this only holds if you aren't concerned about interfering with everyone else (i.e. 1 or 2 low data rate users or the military). 2) Better mulipath resistance. Wider signals are undoubtedly more resistant, but CDMAOne probably already receives most of the available signal anyway, so I doubt this is much of an improvement. The real key is spectral efficiency, and the key factor in that is how well orthogonality stands up to timing problems (e.g. lack of synch between various users) and frequency problems (e.g. doppler shift). This isn't immediate clear to me, and it isn't discussed in the only paper that is readily available at the site. Clark PS Those Gaussian Monopulses and the whole scheme are ideal for a military system - low cost, high spreading, no worries about interference with your neighbors, ..., but it isn't immediately clear how useful it is for cell systems.