[Discuss-gnuradio] Decoding digital data with imperfect timing - what am I missing?

Hi all, I'm receiving an FSK-modulated signal with symbols 1.95-2.0 ms long. The signal starts with a long preamble of 1/0 alternating. This gives me ~97 samples per symbol, which I guess is more than enough for that small variation in length. But whatever I tried so far (own clock_recovery_mm, gf

Re: [Discuss-gnuradio] Question regarding correlating output and IQ samples in a reciever

Hi Marcus, > > It applies, but you must be aware of the fact that transmissions have a > different ratio of "on" symbols and "off" symbols have different > energy/power. So without knowing how many ons and offs you were sending, > that number is pretty meaningless. > Thanks for pointing out this

Re: [Discuss-gnuradio] Receiving errors with Viterbi decoder block/Decoding AIM spacecraft

Hi Michael, I'm just jumping in to advertise a GRC feature: if you use the "screenshot" menu item (identical to the printer button in the tool bar), you get a png of your canvas, rather than a picture of your UI and everything. Best regards, Marcus On 01/30/2016 05:50 PM, Michael Sabino wrote: >

Re: [Discuss-gnuradio] Receiving errors with Viterbi decoder block/Decoding AIM spacecraft

Here's an image of the flowgraph, in addition: http://i.imgur.com/45B2MyL.png Michael On 1/30/16, Michael Sabino wrote: > I abandoned the FSM constructor and decided to just use the decode > CCSDS27 block. > > > Michael > > On 1/30/16, Achilleas Anastasopoulos wrote: >> Michael, >> >> I haven'

Re: [Discuss-gnuradio] Receiving errors with Viterbi decoder block/Decoding AIM spacecraft

I abandoned the FSM constructor and decided to just use the decode CCSDS27 block. Michael On 1/30/16, Achilleas Anastasopoulos wrote: > Michael, > > I haven't seen your flowgraph, but as I wrote in my previous email you are > using the fsm constructor probably in the wrong way: > > You are conf

Re: [Discuss-gnuradio] Receiving errors with Viterbi decoder block/Decoding AIM spacecraft

Michael, I haven't seen your flowgraph, but as I wrote in my previous email you are using the fsm constructor probably in the wrong way: You are confusing the (n,k,K) parameters of a CC. k = number of input bits per period n = number of output bits per period K = constraint length of the code (re

Re: [Discuss-gnuradio] USRP block to receive signal periodically

"num samps and done" would be appropriate. M On 01/29/2016 09:05 PM, Zhihong Luo wrote: > Hi Martin, > > Yes, it was a typo. Just to make sure, do you mean multiple "Num samps > and more" mode commands? > > Thanks, > Zhihong > > On Fri, Jan 29, 2016 at 5:36 AM, Martin Braun

Re: [Discuss-gnuradio] Question regarding correlating output and IQ samples in a reciever

Hi Abhinav, > I don't think OOK is constant power modulation, but I suppose S+N/N should still apply on it. It applies, but you must be aware of the fact that transmissions have a different ratio of "on" symbols and "off" symbols have different energy/power. So without knowing how many ons and off