On Thu, Mar 8, 2012 at 8:19 PM, Arturo Rinaldi <arty.n...@gmail.com> wrote: > Nella citazione in data ven 09 dic 2011 05:55:57 CET, Ben Reynwar ha > scritto: > >> On Thu, Dec 8, 2011 at 5:33 PM, Arturo Rinaldi<arty.n...@gmail.com> >> wrote: >>> >>> I noticed dramatic changes in the 3.5.0 release in the generation of the >>> constellation points of digital modulations. So, if the easy part is to >>> again modify the source code to match my needs, i need some help in using >>> the new block : >>> >>> digital.constellation_decoder_cb(arg1) >>> >>> instead of >>> >>> gr.constellation_decoder(arg1,arg2) >>> >>> I usually used the last one where arg1 is a list containing the complex >>> values of a generic digital modulation and arg2 is the symbol mapping >>> (Gray >>> Coding for instance). Which blocks do i need to put together to get the >>> same >>> result ? >>> >>> Regards, Arturo >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> Simplest solution is probably: >> >> constell = digital.digital_constellation(list_of_complex_points, [], 1, 1) >> decoder = digital.constellation_decoder_cb(constell) >> >> To get the symbol mapping you want, just choose the appropriate order >> of the complex points in the list. >> >> The 2nd, 3rd and 4th arguments to the constellation constructor while >> not relevant to this example are: >> - a mapping to be applied before differential encoding. >> - the rotational-symmetry of the constellation >> - the dimensionality of the constellation (i.e. number of complex >> points that together map to one symbol) >> >> Functions to simplify the creation of commonly used constellations can >> be found in digital.bpsk, digital.qpsk, digital.psk, and digital.qam. >> >> Ben >> > > i made some progress in simplyfing the creation of the constellations but i > still need help in the decoding part. > > I'm trying to calculate the modulation BER by using this flow graph : > > http://imageshack.us/photo/my-images/819/bersimgrchomeartynetscr.png/ > > i removed all the unnecessary parameters to my study (excess bw , > differential coding etc.) because i need only gray coding. and the decoding > part is this one > > http://pastebin.com/wADRx7Hj > > could you please help me ? the grc blocks are made by invoking only the > psk_new.py source > > http://pastebin.com/kawSfuPg > > modified by me. please help me. thx in advance > > Regards, Arturo.
I'd be happy to help but I'm not quite sure what exactly your problem/question is. Maybe you could post the python generated by grc, along with the issue you're having? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
