On Sat, 6 May 2000, Warner Losh wrote:
> With CDMA, you can get a distance very easily. The phones know what
> time it is, or CDMA doesn't work at all. That helps a lot. Much of
> GPS's work is knowing what time it is. Since the phone knows what
> time it is, they can do all kinds of calculations and round trip
> things to get the distance. From there, you have a 120degreep arch to
> worry about. Since CDMA towers have 3 antennas, you likely get use
> slight phase differences between them to narrow it down further. The
> CDMA folks at qualcomm tend to be smart (although as they have gotten
> larger, this tendacy is weaker than it was), so I wouldn't be
> surprised if they thought real hard and were able to do something
> simple in the end because it happened to fall out of the equasions.
Curious about that, I haven't been following it too closely, but I know
cdma works on codes, not timing ... how do they get timing (other than bit
clock recovery)?
>
> Warner
>
>
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Chuck Robey | Interests include C & Java programming, FreeBSD,
[EMAIL PROTECTED] | electronics, communications, and signal processing.
New Year's Resolution: I will not sphroxify gullible people into looking up
fictitious words in the dictionary.
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