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5

That looks like you're strongly overdriving your receiver. Drastically reduce gain. This signal might not come from 137.5 MHz at all but be mixed there by the nonlinear effect of overdriving your amplifiers. The fact you can receive FM (a different signal at a different frequency) doesn't mean the gain is appropriate for this signal. Also, FM, being FM, is ...


5

You're asking exactly the right question – my receiver can't know this property of the transmission, how do I figure it out reliably – and that way of thinking makes for good receiver designs :) There's two classes of methods to solve this: statistics-based methods transmitter data assisted methods What is very common in receiver design is that you have an ...


4

This same problem of discriminating symbols can appear in as simple a system as transmitting an "unmodulated" binary code (2 symbols) over an AC-coupled cable (such as is used in Ethernet). If your message has a long string of 1s or 0s, how does the receiver tell them apart? The solution in either case is to use a coding which ensures that all ...


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