FGFS-4.1/gr-air-modes
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Preamble subtracts average (LPF'ed) input from samples. This has the effect only

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of improving the slicer threshold to exactly 0.5.
This commit is contained in:
Nick Foster 2013-08-04 22:20:15 -07:00
parent 8e1bdafc51
commit 1630e67c3b
1 changed files with 7 additions and 15 deletions
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22
lib/air_modes_preamble.cc
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@ -128,7 +128,7 @@ int air_modes_preamble::general_work(int noutput_items,
if(tstamp_tags.size() > 0) { if(tstamp_tags.size() > 0) {
d_timestamp = tstamp_tags.back(); d_timestamp = tstamp_tags.back();
} }
for(int i=0; i < ninputs; i++) { for(int i=0; i < ninputs; i++) {
float pulse_threshold = inavg[i] * d_threshold; float pulse_threshold = inavg[i] * d_threshold;
if(in[i] > pulse_threshold) { //hey we got a candidate if(in[i] > pulse_threshold) { //hey we got a candidate
@ -175,17 +175,9 @@ int air_modes_preamble::general_work(int noutput_items,
return 0; return 0;
} }
//all right i'm prepared to call this a preamble //all right i'm prepared to call this a preamble
//let's integrate and dump the output for(int j=0; j<240; j++) {
//FIXME: disable and use center sample out[j] = in[i+j*d_samples_per_chip] - inavg[i];
bool life_sucks = true;
if(life_sucks) {
for(int j=0; j<240; j++) {
out[j] = in[i+j*d_samples_per_chip];
}
} else {
i -= d_samples_per_chip-1;
integrate_and_dump(out, &in[i], 240, d_samples_per_chip);
} }
//get the timestamp of the preamble //get the timestamp of the preamble
@ -198,9 +190,9 @@ int air_modes_preamble::general_work(int noutput_items,
pmt::from_double(tstamp), pmt::from_double(tstamp),
d_me //block src id d_me //block src id
); );
//std::cout << "PREAMBLE" << std::endl; //std::cout << "PREAMBLE" << std::endl;
//produce only one output per work call -- TODO this should probably change //produce only one output per work call -- TODO this should probably change
if(0) std::cout << "Preamble consumed " << i+240*d_samples_per_chip << "with i=" << i << ", returned 240" << std::endl; if(0) std::cout << "Preamble consumed " << i+240*d_samples_per_chip << "with i=" << i << ", returned 240" << std::endl;
@ -208,7 +200,7 @@ int air_modes_preamble::general_work(int noutput_items,
return 240; return 240;
} }
} }
//didn't get anything this time //didn't get anything this time
if(0) std::cout << "Preamble consumed " << ninputs << ", returned 0" << std::endl; if(0) std::cout << "Preamble consumed " << ninputs << ", returned 0" << std::endl;
consume_each(ninputs); consume_each(ninputs);