[Discuss-gnuradio] IT++ Convolutional encoder

[Viktor Ivan Rodriguez Abdala]

I have the next code working, in the firsts seconds I have erroneous 
bits, after 10 seconds I don't have any error... another thing if I put 
Max Number of Output = 0 always have a ber of 40%...

Umbrella_encodconv_vff::Umbrella_encodconv_vff (const std::vector<int> 
&val1, int val2, int val3)
    : gr_sync_block ("encodconv_vff",
        gr_make_io_signature (1, 1, sizeof (float) * val3),
        gr_make_io_signature (1, 1, sizeof (float) * val3 * val1.size()))
{
    polsize = val1.size();
    cl = val2;
    pz = val3;

    for (int i = 0; i < 0x100; i++){
        polynom[i] = i;
    }

    unsigned int size = std::min((size_t) 0x100, val1.size());

    for (unsigned int i = 0; i < size; i++){
        polynom[i] = val1[i];
    }

    // -- Channel code parameters --

    itpp::ivec generator(polsize);

    for (int i = 0; i < polsize; i++){
        generator[i] = polynom[i];
    }

    code.set_generator_polynomials(generator, cl);
}

int
Umbrella_encodconv_vff::work (int noutput_items,
            gr_vector_const_void_star &input_items,
            gr_vector_void_star &output_items)
{
    const float *in = (const float *) input_items[0];
    float *out = (float *) output_items[0];

    itpp::bvec tempin(pz * sizeof(float));
    itpp::bvec tempout(pz * polsize * sizeof(float));

        for (int j = 0; j < (pz * sizeof(float)); j++){
            tempin[j] = in[j];
        }

        code.encode_tailbite(tempin, tempout);

        for (int k = 0; k < (pz * polsize * sizeof(float)); k++){
            out[k] = tempout[k];
        }

    // Tell runtime system how many output items we produced.
    return noutput_items;
}