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If they are all transmitting on the same frequency there is no way to tell by looking at the signal itself, you have to modulate it with some identifying data.
As Brian pointed out, you need to transmit an identifier byte which is unique to each transmitter, before you transmit the actual data, so that the receiver knows where the data is coming from.
Also, over a period of time there are bound to be partly overlapping transmissions, which the receiver will see as garbage. To get around this, you need to retransmit from each station after a quasi-random delay. And then some kind of error-checking to reject composite (or overlapped) packets. Now, in a limited time you will get valid readings from all 4 stations.
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