On Tue, Sep 1, 2015 at 2:55 PM, bob wole <bnw...@gmail.com> wrote: > I am trying channel coding in gnuradio. I am using convolutional encoder > with K=7 and R=1/2 with polynomials [109, 79] (default). However I am not > getting the expected result. I input a known bit sequence, single frame > using head block, and observe the output of the encoder using file sink. > The output I think is not correct according to the given polynomials. Input > bit stream is > > http://pastebin.com/thsYtLFG > > I am getting this output > > http://pastebin.com/P42QNjiE > > However, I am expecting (in hex) > > 00 00 E3 32 63 D7 4B FA D3 ...... > > > I have attached the flowgraph I am using for this purpose. I did a dry > run by drawing a diagram of the encoder and inputing initial two bytes. > Diagram of the encoder is also attached. I also used MATLAB script to test > and found that my dry run output matches with MATLAB but not with Gnuradio > output. I also played with the endianness but could not get the desired > result. Maybe I am doing something wrong in configuring the encoder? > > > Also another thing I noticed is that in QA codes of gr-fec I found > > import fec_swig as fec > import blocks_swig as blocks > > I think this should be > > from gnuradio import fec, blocks > > Am I right? I am using gnuradio 3.7.8. > > -- > Bob >
I am still waiting to get a reply on this. Anyone else verified the output of the convolutional encoder? -- Bob
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