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) > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
