On Tue, Jul 10, 2012 at 11:40:00AM -0500, Javier M. Suarez wrote: > I am working with DPSK mod and demod blocks. I would like to know if anyone > knows what is the meaning of the parameters in DPSK demod. I've looked for > them > but I havent found anything.
Hi Javier, assuming you know how a PSK receiver works: > The parameters are: > FLL Bandwidth > Phase Loop Bandwith > Timing bandwith > Omega relative limit This block does *everything* from complex samples to bits. The 3 bandwidths set the parameters for frequency, clock and phase recovery (Tom explained the bw parameter quite well here: http://gnuradio.squarespace.com/blog/2011/8/13/control-loop-gain-values.html) What is confusing is the 'omega' parameter, I must admit, because it's not actually connected (it doesn't do anything). Now if you think about a PSK Rx for a second, you /might/ expect an AGC, and I'm guessing that's where that parameter went. But as I said, ignore that. About finding that stuff: the FLL is actually documented quite well (check e.g. http://gnuradio.org/doc/doxygen/classdigital__fll__band__edge__cc.html, which is the 3rd result for a 'gnuradio fll' google search on my end), but it's not filed under 'synchronization', so perhaps that's where you went wrong. MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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