3 votes
Accepted

Is $y(t) = y(t-4)+x(t-4)$ time invariant or not?

Let's re-write your difference equation: $$y(t) - y(t-4) = x(t-4)$$ Delaying the input gives the following difference equation for the output $y_1(t)$:$$y_1(t) - y_1(t-4) = x(t-m-4)$$ A delayed ...
Jdip's user avatar
  • 6,030
1 vote

How can a costas loop work when root raised cosine filter used on QPSK signal?

If time synch has been completed, confirm that the waveform has been put through a 2nd RRC filter and then down sampled to one sample per symbol. This should then be the ideal constellation with only ...
Dan Boschen's user avatar

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