On 1/30/16, Michael Sabino <michael.r.sab...@gmail.com> wrote: > I'm going to post my flowgraph. I have added a CCSDS decoder block. > Please, if you can, provide input on how to improve the amount of > successfully decoded data with a short wave file and a doppler > shifting BPSK carrier. > > My .wav file: http://1drv.ms/1bS3KxX > > and here is my gnuradio flowgraph: http://1drv.ms/1m3o3N6 > > Using several different decoding methods, I have obtained strings > found in these two documents: > > http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880002723.pdf > http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800022222.pdf > > (for the Aeronomy of Ice in the Mesosphere spacecraft). One is old > NASA teleoperator system reference, if that helps. > > However, the gnuradio method (I was also using a seperate program > written for an SDR analysis/display utility called SDR#/SDRSharp), is > presently suboptimal. > > I have some times where I see a BPSK constellation, but other times > (some in between the good constellations) I just see a ring where it > loses synchronization. Please provide help on how to improve my BPSK > demodulator. > > Thanks > > Michael Sabino > > On 1/27/16, Achilleas Anastasopoulos <anas...@umich.edu> wrote: >> The problem is not the length 2048 but the way you use the fsm >> constructor >> >> trellis.fsm(2,7,[79,109]) >> >> You are trying to create an FSM for a (7,2) CC. >> >> This means you need to provide a vector of 2x7 integers, each >> >> representing the generator polynomial between the i-th input (i=0,1) >> >> to the j-th output (j=0,1,...,6) >> >> >> However you only provide 2 of them. >> >> >> Are you sure this is what you want to do? >> >> ------------ >> >> this is a snippet from fsm.cc >> >> >> //###################################################################### >> //# Automatically generate the FSM from the generator matrix >> //# of a (n,k) binary convolutional code >> >> //###################################################################### >> fsm::fsm(int k, int n, const std::vector<int> &G) >> >
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