3
votes
Accepted
Is this waterfall characteristic of QAM or OFDM (or something other) modulation?
The sharp rectangular shape of the spectrum, with the immensely flat top definitely says "OFDM, with suitable whitening/PAPR reduction"; what constellation is used on the individual carriers is a bit ...
- 29.6k
2
votes
Friendly target identification in radar
Every system will be different, so it’s impossible to make a blanket statement that applies to everything, but IFF systems can be used to accomplish the task. The signal processing here can be as ...
- 853
2
votes
Accepted
How to measure/estimate symbol rate of a signal with unknown ( but probably QAM ) modulation?
The nonlinear trick is in fact often used to recover the symbol clock of $\frac \pi {2N}$ phase-shifted signals, e.g. BPSK, QPSK: Squaring samples $x[n]$ (or even taking $x^4$) leads to a removal of ...
- 29.6k
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