mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-23 08:28:36 -05:00
123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019, 2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////////
|
|
#include "sdr.h"
|
|
|
|
namespace leansdr
|
|
{
|
|
|
|
const char *cstln_base::names[] =
|
|
{
|
|
"BPSK",
|
|
"QPSK",
|
|
"8PSK",
|
|
"16APSK",
|
|
"32APSK",
|
|
"64APSKe",
|
|
"16QAM",
|
|
"64QAM",
|
|
"256QAM"
|
|
};
|
|
|
|
|
|
void softsymb_harden(llr_ss *ss)
|
|
{
|
|
for (int b = 0; b < 8; ++b) {
|
|
ss->bits[b] = (ss->bits[b] < 0) ? -127 : 127;
|
|
}
|
|
}
|
|
|
|
void softsymb_harden(hard_ss *ss)
|
|
{
|
|
(void)ss; // NOP
|
|
}
|
|
|
|
void softsymb_harden(eucl_ss *ss)
|
|
{
|
|
for (int s = 0; s < ss->MAX_SYMBOLS; ++s) {
|
|
ss->dists2[s] = (s == ss->nearest) ? 0 : 1;
|
|
}
|
|
}
|
|
|
|
|
|
uint8_t softsymb_to_dump(const llr_ss &ss, int bit)
|
|
{
|
|
return 128 - ss.bits[bit];
|
|
}
|
|
|
|
uint8_t softsymb_to_dump(const hard_ss &ss, int bit)
|
|
{
|
|
return ((ss >> bit) & 1) ? 255 : 0;
|
|
}
|
|
|
|
uint8_t softsymb_to_dump(const eucl_ss &ss, int bit)
|
|
{
|
|
(void)bit;
|
|
return ss.dists2[ss.nearest] >> 8;
|
|
}
|
|
|
|
|
|
void to_softsymb(const full_ss *fss, hard_ss *ss)
|
|
{
|
|
*ss = fss->nearest;
|
|
}
|
|
|
|
void to_softsymb(const full_ss *fss, eucl_ss *ss)
|
|
{
|
|
for (int s = 0; s < ss->MAX_SYMBOLS; ++s) {
|
|
ss->dists2[s] = fss->dists2[s];
|
|
}
|
|
|
|
uint16_t best = 65535, best2 = 65535;
|
|
|
|
for (int s = 0; s < ss->MAX_SYMBOLS; ++s)
|
|
{
|
|
if (fss->dists2[s] < best)
|
|
{
|
|
best2 = best;
|
|
best = fss->dists2[s];
|
|
}
|
|
else if (fss->dists2[s] < best2)
|
|
{
|
|
best2 = fss->dists2[s];
|
|
}
|
|
}
|
|
|
|
ss->discr2 = best2 - best;
|
|
ss->nearest = fss->nearest;
|
|
}
|
|
|
|
void to_softsymb(const full_ss *fss, llr_ss *ss)
|
|
{
|
|
for (int b = 0; b < 8; ++b)
|
|
{
|
|
float v = (1.0f - fss->p[b]) / (fss->p[b] + 1e-6);
|
|
int r = logf(v) * 5; // TBD Optimal scaling vs saturation ?
|
|
|
|
if (r < -127) {
|
|
r = -127;
|
|
}
|
|
|
|
if (r > 127) {
|
|
r = 127;
|
|
}
|
|
|
|
ss->bits[b] = r;
|
|
}
|
|
}
|
|
|
|
} // leansdr
|