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https://github.com/f4exb/sdrangel.git
synced 2024-11-30 03:38:55 -05:00
98 lines
1.9 KiB
C++
98 lines
1.9 KiB
C++
#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] = "BPSK",
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[QPSK] = "QPSK",
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[PSK8] = "8PSK",
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[APSK16] = "16APSK",
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[APSK32] = "32APSK",
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[APSK64E] = "64APSKe",
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[QAM16] = "16QAM",
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[QAM64] = "64QAM",
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[QAM256] = "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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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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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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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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if (r > 127)
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r = 127;
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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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