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