Re: [Discuss-gnuradio] About FLL and phase tracking error in narrow band domodulation

[Martin Braun (CEL)]

On Tue, Jan 08, 2013 at 12:27:29AM -0600, Alex Zhang wrote:
> In the gnuradio/gr-digital/python/generic_mod_demod.py, two blocks contains 
> the
> code related to the frequency offset correction.
> 
> 1. digital.fll_band_edge_cc
> 
>   I am not familiar with the algorithm employed in this frequency loop locking
> block. Is there any direct reference for this block, such as paper or
> documentation?

https://lists.gnu.org/archive/html/discuss-gnuradio/2012-10/msg00019.html

> 2. digital.constellation_receiver_cb
> 
>  It has a member function to update the phase and frequecy of the incoming
> samples, digital_constellation_receiver_cb::phase_error_tracking()
> 
> Is there any reference for me to understand it more easily. Especially, this
> member function calls 

Perhaps this helps?
http://www.trondeau.com/blog/2011/8/13/control-loop-gain-values.html

MB
-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

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