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sync short: detect frames during copying

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This commit is contained in:
Bastian Bloessl
2015-04-14 13:05:54 +02:00
parent ec195bed59
commit d8f0159985
1 changed files with 28 additions and 7 deletions
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lib/ofdm_sync_short.cc
+28 -7
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@@ -22,6 +22,8 @@
using namespace gr::ieee802_11; using namespace gr::ieee802_11;
static const int MIN_GAP = 800;
class ofdm_sync_short_impl : public ofdm_sync_short { class ofdm_sync_short_impl : public ofdm_sync_short {
public: public:
@@ -86,20 +88,39 @@ int general_work (int noutput_items, gr_vector_int& ninput_items,
case COPY: { case COPY: {
int to_copy = std::min(d_copy_left, std::min(noutput, ninput)); int o = 0;
std::memcpy(out, in, to_copy * sizeof(gr_complex)); while( (o < ninput) && (o < noutput) && d_copy_left) {
if(in2[o] > d_threshold) {
if(d_plateau < MIN_PLATEAU) {
d_plateau++;
d_copy_left -= to_copy; // there's another frame
} else if((MAX_SAMPLES - d_copy_left) > MIN_GAP) {
d_copy_left = MAX_SAMPLES;
d_plateau = 0;
insert_tag(nitems_written(0) + o);
dout << "SHORT Frame!" << std::endl;
break;
}
} else {
d_plateau = 0;
}
out[o] = in[o];
o++;
d_copy_left--;
}
if(!d_copy_left) { if(!d_copy_left) {
d_state = SEARCH; d_state = SEARCH;
} }
dout << "SHORT copied " << to_copy << std::endl; dout << "SHORT copied " << o << std::endl;
consume(0, to_copy); consume(0, o);
consume(1, to_copy); consume(1, o);
return to_copy; return o;
} }
} }