FGFS-4.1/gr-air-modes
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Preamble subtracts average (LPF'ed) input from samples. This has the effect only

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
lib/air_modes_preamble.cc
View File

@ -128,7 +128,7 @@ int air_modes_preamble::general_work(int noutput_items,
if(tstamp_tags.size() > 0) {
d_timestamp = tstamp_tags.back();
}
for(int i=0; i < ninputs; i++) {
float pulse_threshold = inavg[i] * d_threshold;
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;
}
//all right i'm prepared to call this a preamble
//let's integrate and dump the output
//FIXME: disable and use center sample
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);
//all right i'm prepared to call this a preamble
for(int j=0; j<240; j++) {
out[j] = in[i+j*d_samples_per_chip] - inavg[i];
}
//get the timestamp of the preamble
@ -198,9 +190,9 @@ int air_modes_preamble::general_work(int noutput_items,
pmt::from_double(tstamp),
d_me //block src id
);
//std::cout << "PREAMBLE" << std::endl;
//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;
@ -208,7 +200,7 @@ int air_modes_preamble::general_work(int noutput_items,
return 240;
}
}
//didn't get anything this time
if(0) std::cout << "Preamble consumed " << ninputs << ", returned 0" << std::endl;
consume_each(ninputs);