Thanks for your explanation! That's worth while looking into!
On Fri, Jul 31, 2015 at 1:17 AM, Francisco Albani < francisco.alb...@gmail.com> wrote: > From Matlab MM documentation [1]: > > "[...] Typically, the input signal is the output of a receive filter that > is matched to the transmitting pulse shape. [...]" > > Assuming the MM Gnuradio implementation has the same hypothesis on the > input signal (anybody can confirm this?), I deduced this block is usually > misused when feed with a square signal, because it will take only one > sample per symbol discarding the rest (with useful energy). You can put a > Moving Average before for better results. > > This is one of the reason why the pfb_clock_recovery block is better, but > unfortunately unfit for square signals [2]. I found even better results > using a gaussian filter inside pfb_clock_recovery as the pseudo-matched > filter to square pulses (with a proper bt value). (Obviously I can only > guarantee this for the specific signal I worked with) > > [1] > http://www.mathworks.com/help/comm/ref/muellermullertimingrecovery.html > [2] See discussion: http://gnuradio.org/redmine/issues/812 > > 2015-07-30 16:03 GMT-03:00 Iluta V <iluta2...@gmail.com>: > >> Hi, Tom, >> >> Could you be more specific where exactly it is not "the right algorithm"? >> We'd appreciate that and would correct that in own work as well, if >> Security Research Assessment made a mistake here. >> >> I will be looking forward to your response, >> >> Iluta >> >> >> >> On Thu, Jul 30, 2015 at 9:55 PM, Tom Rondeau <t...@trondeau.com> wrote: >> >>> On Thu, Jul 30, 2015 at 2:38 PM, Iluta V <iluta2...@gmail.com> wrote: >>> >>>> Research paper CONVERTING RADIO SIGNALS TO DATA PACKETS (Examination of >>>> Using GNU Radio Companion for Security Research and Assessment) deals with >>>> Clock Recovery MM, I attached the paper, have a look at: >>>> >>>> 6.Section 6.Counting the Bits >>>> 7.Analyzing Demodulated Data >>>> >>>> Both deal with Clock Recovery MM usage and has flowgraphs. >>>> >>>> Best regards, >>>> >>>> Iluta >>>> >>> >>> >>> That's great, and I'm glad they got it to work for their application. >>> Looks like they provide a good explanation of its use, too. Still, it's not >>> the right algorithm. >>> >>> >> >> >>> Tom >>> >>> >>> >>> >>>> On Thu, Jul 30, 2015 at 9:23 PM, Tom Rondeau <t...@trondeau.com> wrote: >>>> >>>>> Another point to keep in mind is that the M&M block isn't great in >>>>> fading environments. It's really suboptimal in general. Look at the >>>>> pfb_clock_recovery block, instead. >>>>> >>>>> Tom >>>>> >>>>> >>>>> On Thu, Jul 30, 2015 at 2:18 PM, Daniel Camara <danielcam...@gmail.com >>>>> > wrote: >>>>> >>>>>> Hi Klauss, >>>>>> >>>>>> You could also take a look at >>>>>> https://www.tablix.org/~avian/blog/archives/2015/03/notes_on_m_m_clock_recovery/, >>>>>> it helped me quite a bit! >>>>>> >>>>>> Best regards... >>>>>> >>>>>> Daniel >>>>>> >>>>>> On Thu, Jul 30, 2015 at 7:17 PM, Martin Braun <martin.br...@ettus.com >>>>>> > wrote: >>>>>> >>>>>>> Klaus, >>>>>>> >>>>>>> the manual page for this block has a paper reference in it: >>>>>>> >>>>>>> http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1clock__recovery__mm__ff.html#details >>>>>>> >>>>>>> M >>>>>>> >>>>>>> On 30.07.2015 10:16, Klauss Wolfeinstein wrote: >>>>>>> > Hello, >>>>>>> > >>>>>>> > I would like to find a proper documentation on MM algorithm block >>>>>>> (paper >>>>>>> > for example). Any ideas ? >>>>>>> > >>>>>>> > Thank you. >>>>>>> > >>>>>>> > Regards. >>>>>>> > >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Discuss-gnuradio mailing list >>>>>>> Discuss-gnuradio@gnu.org >>>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Best regards... >>>>>> >>>>>> Daniel >>>>>> >>>>>> _______________________________________________ >>>>>> Discuss-gnuradio mailing list >>>>>> Discuss-gnuradio@gnu.org >>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> Discuss-gnuradio@gnu.org >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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