3 votes

What is the name of this FFT technique for carrier recovery?

You can find very similar implementations as part of a "squaring loop" for carrier recovery, and this would be the closest name related to the fundamental operation provided - which is not ...
Dan Boschen's user avatar
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3 votes
Accepted

Symbol Sync blocks in GNU Radio seem to use PID (well, PI) for their clock sync feedback loops. Why not IIR/FIR?

Keep in mind that we are talking about a clock synchronization loop, so you need to think of the behavior from a control-systems perspective. FIR Just discard that notion right out. There are good ...
TimWescott's user avatar
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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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1 vote
Accepted

CFO limit for correct LTE Zadoff-Chu Synchronization

The CFO estimation range is defined by the length of your correlation sequence, such that: $f_{est} = +/- 1/T$, where $T$ is the length of your sequence in time. Rewritten another way: $f_{est}= +/- ...
BigBrownBear00's user avatar
1 vote

Is there any specific order for the synchronization blocks at the receiver?

I'm on the run, but can give a short factual, if not very illustrative answer: The order depends on the kind of signal, and on the methods you choose to synchronize. There's no "one common order&...
Marcus Müller's user avatar
1 vote

What is the name of this FFT technique for carrier recovery?

I'm not aware that this has a generally accepted name. I'd call it timing recovery through removal of data from $M$-PSK through taking the $M$th power but I've heard it being called simply "...
Marcus Müller's user avatar
1 vote
Accepted

QPSK demodulation carrier frequency offset compensation on python

The OP is correct that the constellation is spinning due to a frequency offset, and removing the phase versus time is the right direction to take (which is frequency offset given frequency is the time ...
Dan Boschen's user avatar
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