Tom Rondeau wrote: >>-----Original Message----- >>From: [EMAIL PROTECTED] [mailto:discuss- >>[EMAIL PROTECTED] On Behalf Of Martin Dvh >>Sent: Wednesday, January 31, 2007 10:24 PM >>To: gnuradio mailing list >>Subject: Re: [Discuss-gnuradio] QAM, carrier tracking and clock recovery >> >>You might find my benchmark_rx_oscopy.py and kinda working qam16 code >>interesting. >>they are in branches/developers/nldudok1/digital-wip3 which is a branched >>version of your digital-wip2 >>look in >>branches/developers/nldudok1/digital-wip3/gnuradio- >>examples/python/digital/ >>and >>branches/developers/nldudok1/digital-wip3/gnuradio- >>core/src/lib/general/gr_mpsk_receiver_cc >>and >>branches/developers/nldudok1/digital-wip3/gnuradio- >>core/src/python/blksimpl >> >>benchmark_rx_oscopy.py gives you a live constellation view (put it at X-Y >>mode manually with the rightmost pulldown) >>and live tweaking of parameters >> >>greetings, >>Martin > > > > I just saw the commit now. I'll check it out tomorrow and see what it looks > like. You guys are my new heroes; I wouldn't have been able to touch this > for a while yet ;) > > How's it working with the AGC loop? The agc2 seems to work. The feedforward agc only works when manually compensating for the noise (1.0 + noise as reference) This would need an error loopback from the gr_mspk receiver
I think my main problem now is detecting of which quadrant we are in. Or use the right kind of differential coding. (I just used the gr.diff_decoder_bb and gr.diff_encoder_bb) I have also strugled with the right formulation for the phase_detector error signal. (conj or not, pos or neg sign) But I think I got it now. I send the complete constellation as list from python to the mpsk_receiver as vector. For some reason I had to reverse this list to get it to work. This could also mean I needed to solve this in a different way and it just accidently now sometimes works. (mirror the constellation, add pi, something like that) Greetings, Martin > Tom > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
