On 09/29/2010 07:17 PM, Jeffrey Okamitsu wrote:
More importantly, does this impose an upper limit on data transport speed over networks, in particular wireless networks?
No, not really.
If and when one produces the network technology that would demand the accuracy and precision of these new standards, if one object is moving relative to the other, there could be loss of data as the moving clock goes out of sync with the stationary one. We know this was possible just from special relativity, but motion at "normal" speeds does not contribute appreciably at the currently achievable accuracies and precisions. However, with the next generation, driving in a car or certainly flying in a plane will limit bandwidth. And, of course there's the gravitation effect to contend with in the future as well, which could also limit bandwidth.
The imprecision of oscillators being used is so huge that gravitational effects is swamped in normal everyday life. You need significant elevation such as that of GPS satellites, but much of that effect can be treated using frequency offset and the remaining effect involves movement.
As I am thinking about this, does this impose a limit on GPS accuracy and precision based on the next gen technology?
No, gravitational effects is first degree compensated and only a minor second degree effect needs compensation for some case. These effects is very predictable.
You can always find cases where a particular effect forms a limit, but relative theory doesn't form a practical limit for most of the day to day life and use of technology.
For the case of telecommunication networks, the receiver will recover the symbol rate of the signal in order to sample the symbols and later those symbols is converted into bits. That the transmitter and receiver has different gravitational potential causes a small offset in frequency, but since the receiver PLL tracks the frequency then frequency errors due to oscillator offsets, temperature changes, doppler effects as one moves around etc.
Doppler effects is much more important, and it's effects is being treated regularly, such as when talking in the GSM phone while driving the car...
Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
