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digital communication


Question Posted Thursday February 9 2006, 11:57 pm

is it possible to receive different digital codes, at the same frequency, sent by different transmitters, in a very short (or the same) time period? won't the codes cause distortion for each other? the receiver
will be connected to a circuit that will decode the codes and segregate further.
if yes,how can this be achieved?


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Asc answered Friday February 10 2006, 2:36 pm:
I'm no expert in the subject, but my father (an electronics engineer) was working with a similar problem a few months ago, where he had a number of devices which needed to transmit data to a receiver (via radio) on the same frequency after receiving a single activation code. I don't know how the problem was eventually resolved* (and probably wouldn't understand it if I did), but the problem itself was that the data was corrupted if two of the devices transmitted at the same time.

I think it just might be possible that you could do some fancy amplitude math or somesuch if the signals were out of phase with one another, but I wouldn't bet my success on something like that actually working and it doesn't sound like you have the equipment for it.


*One idea was for each device to randomize the time between receiving the signal and transmitting data to where the probability of two transmitters sending data at the same time was very small... I can't think of a very good solution for this problem.

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