diff options
| author | anastas <anastas@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-08-11 10:27:46 +0000 |
|---|---|---|
| committer | anastas <anastas@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-08-11 10:27:46 +0000 |
| commit | 8e8f22dda66b63ee58a25f1052cd197779f164dc (patch) | |
| tree | c4c317c44a7c2984f846f54153a3470656f69e9e /gr-trellis/src/lib/trellis_calc_metric.cc | |
| parent | 954e2976e43507479e0bc5d1526e555627117125 (diff) | |
Added support for concatenated codes
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3234 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gr-trellis/src/lib/trellis_calc_metric.cc')
| -rw-r--r-- | gr-trellis/src/lib/trellis_calc_metric.cc | 92 |
1 files changed, 90 insertions, 2 deletions
diff --git a/gr-trellis/src/lib/trellis_calc_metric.cc b/gr-trellis/src/lib/trellis_calc_metric.cc index c6d2ce98cb..ae25a67bad 100644 --- a/gr-trellis/src/lib/trellis_calc_metric.cc +++ b/gr-trellis/src/lib/trellis_calc_metric.cc @@ -24,7 +24,95 @@ #include <stdexcept> #include "trellis_calc_metric.h" -// soft decisions (Eucledean distance squared) +// soft decisions (Euclidean distance squared) +void calc_metric_s(const int O, const int D, const std::vector<short> &TABLE, const short *in, float *metric, trellis_metric_type_t type) +{ + float minm = FLT_MAX; + int minmi = 0; + + switch (type){ + case TRELLIS_EUCLIDEAN: + for(int o=0;o<O;o++) { + metric[o]=0.0; + for (int m=0;m<D;m++) { + float s=in[m]-TABLE[o*D+m]; + metric[o]+=s*s; + } + } + break; + case TRELLIS_HARD_SYMBOL: + for(int o=0;o<O;o++) { + metric[o]=0.0; + for (int m=0;m<D;m++) { + float s=in[m]-TABLE[o*D+m]; + metric[o]+=s*s; + } + if(metric[o]<minm) { + minm=metric[o]; + minmi=o; + } + } + for(int o=0;o<O;o++) { + metric[o] = (o==minmi?0.0:1.0); + } + break; + case TRELLIS_HARD_BIT: + throw std::runtime_error ("Invalid metric type (not yet implemented)."); + break; + default: + throw std::runtime_error ("Invalid metric type."); + } +} + + + +// soft decisions (Euclidean distance squared) +void calc_metric_i(const int O, const int D, const std::vector<int> &TABLE, const int *in, float *metric, trellis_metric_type_t type) +{ + float minm = FLT_MAX; + int minmi = 0; + + switch (type){ + case TRELLIS_EUCLIDEAN: + for(int o=0;o<O;o++) { + metric[o]=0.0; + for (int m=0;m<D;m++) { + float s=in[m]-TABLE[o*D+m]; + metric[o]+=s*s; + } + } + break; + case TRELLIS_HARD_SYMBOL: + for(int o=0;o<O;o++) { + metric[o]=0.0; + for (int m=0;m<D;m++) { + float s=in[m]-TABLE[o*D+m]; + metric[o]+=s*s; + } + if(metric[o]<minm) { + minm=metric[o]; + minmi=o; + } + } + for(int o=0;o<O;o++) { + metric[o] = (o==minmi?0.0:1.0); + } + break; + case TRELLIS_HARD_BIT: + throw std::runtime_error ("Invalid metric type (not yet implemented)."); + break; + default: + throw std::runtime_error ("Invalid metric type."); + } +} + + + + + + + +// soft decisions (Euclidean distance squared) void calc_metric_f(const int O, const int D, const std::vector<float> &TABLE, const float *in, float *metric, trellis_metric_type_t type) { float minm = FLT_MAX; @@ -65,7 +153,7 @@ void calc_metric_f(const int O, const int D, const std::vector<float> &TABLE, co } -// soft decisions (Eucledean distance squared) +// soft decisions (Euclidean distance squared) void calc_metric_c(const int O, const int D, const std::vector<gr_complex> &TABLE, const gr_complex *in, float *metric, trellis_metric_type_t type) { float minm = FLT_MAX; |