The general rule for aliasing. If my sampling frequency is Fs=800MHz signal frequency =120MHz.
For the 4th harmonics 480MHz its 80MHz above Nyquist frequency(400MHz) thus its mirrored 80MHz back to 320MHz.
What about 1120MHz the closest nyquist frequency to it is 2*400 so its supposed to be mirrored 800-320=480 Why we do double mirroring for it? Why it also mirrored to 320MHz?