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3 commits
next ... rme

Author SHA1 Message Date
Ahmet Inan
da33b7b68c candidates are sorted now 2024-03-09 16:09:50 +01:00
Ahmet Inan
ca8546deb1 use the faster second version of the estimator 2021-09-10 23:56:42 +02:00
Ahmet Inan
c223befa1a use the repeated median estimator of Siegel 2021-09-10 00:15:21 +02:00
1 changed files with 11 additions and 16 deletions
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27
decode.cc
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@ -9,8 +9,8 @@ Copyright 2021 Ahmet Inan <inan@aicodix.de>
#include <cassert>
#include <cmath>
namespace DSP { using std::abs; using std::min; using std::cos; using std::sin; }
#include "repeated_median.hh"
#include "bip_buffer.hh"
#include "theil_sen.hh"
#include "xorshift.hh"
#include "trigger.hh"
#include "complex.hh"
@ -193,7 +193,7 @@ struct Decoder
DSP::BlockDC<value, value> blockdc;
DSP::Hilbert<cmplx, filter_len> hilbert;
DSP::BipBuffer<cmplx, buffer_len> input_hist;
DSP::TheilSenEstimator<value, cols_max> tse;
DSP::RepeatedMedianEstimator2<value, cols_max> rme;
SchmidlCox<value, cmplx, search_pos, symbol_len/2, guard_len> correlator;
CODE::CRC<uint16_t> crc0;
CODE::CRC<uint32_t> crc1;
@ -519,13 +519,13 @@ struct Decoder
index[i] = i + code_off;
phase[i] = arg(cons[cons_cols*j+i] * conj(mod_map(tmp)));
}
tse.compute(index, phase, cons_cols);
//std::cerr << "Theil-Sen slope = " << tse.slope() << std::endl;
//std::cerr << "Theil-Sen yint = " << tse.yint() << std::endl;
sum_slope += tse.slope();
sum_yint += tse.yint();
rme.compute(index, phase, cons_cols);
//std::cerr << "rme slope = " << rme.slope() << std::endl;
//std::cerr << "rme yint = " << rme.yint() << std::endl;
sum_slope += rme.slope();
sum_yint += rme.yint();
for (int i = 0; i < cons_cols; ++i)
cons[cons_cols*j+i] *= DSP::polar<value>(1, -tse(i+code_off));
cons[cons_cols*j+i] *= DSP::polar<value>(1, -rme(i+code_off));
}
value avg_slope = sum_slope / cons_rows;
value avg_yint = sum_yint / cons_rows;
@ -557,20 +557,15 @@ struct Decoder
for (int i = 0; i < cons_cnt; ++i)
mod_soft(code+mod_bits*i, cons[i], precision);
lengthen();
CODE::PolarHelper<mesg_type>::PATH metric[mesg_type::SIZE];
polardec(metric, mesg, code, frozen_bits, code_order);
polardec(0, mesg, code, frozen_bits, code_order);
systematic();
int order[mesg_type::SIZE];
for (int k = 0; k < mesg_type::SIZE; ++k)
order[k] = k;
std::sort(order, order+mesg_type::SIZE, [metric](int a, int b){ return metric[a] < metric[b]; });
int best = -1;
for (int k = 0; k < mesg_type::SIZE; ++k) {
crc1.reset();
for (int i = 0; i < crc_bits; ++i)
crc1(mesg[i].v[order[k]] < 0);
crc1(mesg[i].v[k] < 0);
if (crc1() == 0) {
best = order[k];
best = k;
break;
}
}