diff options
| author | Daniel Estévez <daniel@destevez.net> | 2017-08-02 22:19:33 +0200 |
|---|---|---|
| committer | Daniel Estévez <daniel@destevez.net> | 2017-08-02 22:46:13 +0200 |
| commit | 81a7988f38b291b75e81b32b9a882e16965b1020 (patch) | |
| tree | 0276b4b6d80cdbe8ecbf713c2dd9ee20052cd3fd /gr-fec | |
| parent | 3b3a403e8871bdb83f8cd9bdc904626de14a7cca (diff) | |
Support negative polynomials in cc_encoder
Negative polynomials are already supported in cc_decoder. Inverting
the sign of the polynomial in a convolutional code is just a convention
to invert the output bit corresponding to that polynomial.
Diffstat (limited to 'gr-fec')
| -rw-r--r-- | gr-fec/lib/cc_encoder_impl.cc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gr-fec/lib/cc_encoder_impl.cc b/gr-fec/lib/cc_encoder_impl.cc index 75d7dcd66b..9585d5fcd5 100644 --- a/gr-fec/lib/cc_encoder_impl.cc +++ b/gr-fec/lib/cc_encoder_impl.cc @@ -179,7 +179,7 @@ namespace gr { for(unsigned int i = 0; i < d_frame_size; ++i) { my_state = (my_state << 1) | (in[i] & 1); for(unsigned int j = 0; j < d_rate; ++j) { - out[i * d_rate + j] = parity(my_state & d_polys[j]) == 0 ? 0 : 1; + out[i * d_rate + j] = (d_polys[j] < 0) ^ parity(my_state & abs(d_polys[j])) ? 1 : 0; } } @@ -187,7 +187,7 @@ namespace gr { for(unsigned int i = 0; i < d_k - 1; ++i) { my_state = (my_state << 1) | ((d_start_state >> (d_k - 2 - i)) & 1); for(unsigned int j = 0; j < d_rate; ++j) { - out[(i + d_frame_size) * d_rate + j] = parity(my_state & d_polys[j]) == 0 ? 0 : 1; + out[(i + d_frame_size) * d_rate + j] = (d_polys[j] < 0) ^ parity(my_state & abs(d_polys[j])) ? 1 : 0; } } } |