Concerning the normalizion of signals

[pro]

It is very nice to meet you.
The website really is wonderful.
Thanks a lot to the sponsor and all the people in support of it.

My question is:
When will the signal be normalized/scaled at the input of the demodulator, and why do we normalized/scaled it?

Thanks again!

[charan langton]

In receivers, the signals are not normalized. But since both the demodulator and decoder work only in a range of input signal levels, one way or the other the input signal has to brought to these levels. This can be done with a LNA (low noise amplifier) prior to demodulating. The input analog signal that goes into a demodulator is then "demodulated" into hard levels of 0 or 1 (or tuples if higher order modulation). So you could call that scaling. But there is usually no need to scale or normalize in a real system as we normally talk about these terms when doing class problems.

Charan Langton

[commtech]

Thank you very much!