What is the actual amplitude where it fails? Many of the clock sync blocks
in GR expect a signal between -1.0 and +1.0, though I am not sure about the
PFB Clock Sync.
On Sun, Mar 11, 2018 at 10:37 AM Milos Milosavljevic <
> Dear All,
> I am using the pfb_clock_sync to estimate the timing offset in my QPSK
> receiver and I have a problem that I would like to ask about.
> Basically if the amplitude of the incoming signal is set relatively high
> (havent checked what actual threshold is) the flowgraph just hangs. After
> the process of elimination I discovered that it is actually the
> pfb_clock_sync block that causes this. Then I put some printf statements in
> the code and found out that the d_k (phase) value becomes -NaN when signal
> amplitude becomes high. The same thing is with the d_error from
> here d_error = (error_i + error_r) / 2.0.
> I suspect it is due to some filtering (either the RC or diff filter).
> Do you have any suggestions on where this might be coming from?
> Any comments will be highly appreciated.
> Many thanks,
> Kind Regards
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