FGFS-4.1/gr-air-modes
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This commit is contained in:
Nick Foster 2011-05-30 21:00:57 -07:00
parent a1249b8c4d
commit ef5c0fbd53
1 changed files with 6 additions and 2 deletions
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src/lib/air_modes_preamble.cc
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@ -112,8 +112,12 @@ int air_modes_preamble::work(int noutput_items,
float avgpeak = (bit_energies[0] + bit_energies[1] + bit_energies[2] + bit_energies[3]) / 4;
float space_threshold = bit_energies[0] / d_threshold; //set the threshold requirement for spaces (0 chips) to threshold dB below the current peak
//search between pulses and all the way out to 8.0us to make sure there are no pulses inside the "0" chips. make sure all the samples are <= (inraw[peak] * d_threshold).
//set the threshold requirement for spaces (0 chips) to
//threshold dB below the current peak
float space_threshold = bit_energies[0] / d_threshold;
//search between pulses and all the way out to 8.0us to make
//sure there are no pulses inside the "0" chips. make sure
//all the samples are <= (inraw[peak] * d_threshold).
//so 0.5us has to be < space_threshold, as does (1.5-3), 4, (5-7.5) in order to qualify.
for(int j = 1.5 * d_samples_per_symbol; j <= 3 * d_samples_per_symbol; j+=d_samples_per_chip)
if(inraw[i+j] > space_threshold) valid_preamble = false;