It seems that they just has a difference on the magnitude.
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> P.S. It is a OOK signal on receiver.
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> The wave on oscillograph can be found on the following link:
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formatting link
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> Thanks in advance!
First set use bandpass filter around your carrier frequency to eliminate the out of band signals. then just do the normal OOK decoding of rectification and LP filtering then set the thrshold between the max and min values.
looks like you have a decent level change that should be fairly reliable.
If it needs ultimate reliability.
1) move your OOK carrier frequency to a clean spectrum, 2) clean up the noise? Maybe should have been 1. :)