Date: Mon, 08 May 2000 10:00:44 -0600 From: Warner Losh <imp@village.org> To: Chuck Robey <chuckr@picnic.mat.net> Cc: Nate Williams <nate@yogotech.com>, Mike Smith <msmith@FreeBSD.ORG>, hackers@FreeBSD.ORG Subject: Re: [OT] Finding people with GSM phones (was Re: GPS heads up ) Message-ID: <200005081600.KAA77785@harmony.village.org> In-Reply-To: Your message of "Sun, 07 May 2000 13:59:24 EDT." <Pine.BSF.4.21.0005071358090.79947-100000@picnic.mat.net> References: <Pine.BSF.4.21.0005071358090.79947-100000@picnic.mat.net>
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In message <Pine.BSF.4.21.0005071358090.79947-100000@picnic.mat.net> Chuck Robey writes: : 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)? cdma does work on timing. It effectively transmits all the data all the time. Phones need to know when the start of frame is, which means they need to know what time it is. They can get that from the last start of frame, and the rate of start of frames they are seeing. cdma and tdma are different in some ways, but they both have to know what time it is to work. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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