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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
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commit 033c4e9a5b
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96
firmware/baseband/ook.hpp
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@ -31,65 +31,61 @@
#include <cmath>
class OOKSlicerMagSquaredInt {
public:
using symbol_t = bool;
public:
using symbol_t = bool;
constexpr OOKSlicerMagSquaredInt(
const float samples_per_symbol
) : mag2_threshold_leak_factor {
static_cast<uint32_t>(
factor_sq(-1.0f / (8.0f * samples_per_symbol)) * float(1ULL << 32)
)
}
{
}
constexpr OOKSlicerMagSquaredInt(
const float samples_per_symbol)
: mag2_threshold_leak_factor{
static_cast<uint32_t>(
factor_sq(-1.0f / (8.0f * samples_per_symbol)) * float(1ULL << 32))} {
}
symbol_t operator()(const std::complex<int16_t> in) {
const uint32_t real2 = in.real() * in.real();
const uint32_t imag2 = in.imag() * in.imag();
const uint32_t mag2 = real2 + imag2;
symbol_t operator()(const std::complex<int16_t> in) {
const uint32_t real2 = in.real() * in.real();
const uint32_t imag2 = in.imag() * in.imag();
const uint32_t mag2 = real2 + imag2;
const uint32_t mag2_attenuated = mag2 >> 3; // Approximation of (-4.5dB)^2
mag2_threshold = (uint64_t(mag2_threshold) * uint64_t(mag2_threshold_leak_factor)) >> 32;
mag2_threshold = std::max(mag2_threshold, mag2_attenuated);
const bool symbol = (mag2 > mag2_threshold);
return symbol;
}
const uint32_t mag2_attenuated = mag2 >> 3; // Approximation of (-4.5dB)^2
mag2_threshold = (uint64_t(mag2_threshold) * uint64_t(mag2_threshold_leak_factor)) >> 32;
mag2_threshold = std::max(mag2_threshold, mag2_attenuated);
const bool symbol = (mag2 > mag2_threshold);
return symbol;
}
private:
const uint32_t mag2_threshold_leak_factor;
uint32_t mag2_threshold = 0;
private:
const uint32_t mag2_threshold_leak_factor;
uint32_t mag2_threshold = 0;
constexpr float factor_sq(float db) {
return std::pow(10.0f, db / (10.0f / 2));
}
constexpr float factor_sq(float db) {
return std::pow(10.0f, db / (10.0f / 2));
}
};
class OOKClockRecovery {
public:
constexpr OOKClockRecovery(
const float samples_per_symbol
) : symbol_phase_inc_nominal { static_cast<uint32_t>(std::round((1ULL << 32) / samples_per_symbol)) },
symbol_phase_inc_k { static_cast<uint32_t>(std::round(symbol_phase_inc_nominal * (2.0f / 8.0f) / samples_per_symbol)) },
phase_detector { static_cast<size_t>(std::round(samples_per_symbol)) },
phase_accumulator { symbol_phase_inc_nominal }
{
}
public:
constexpr OOKClockRecovery(
const float samples_per_symbol)
: symbol_phase_inc_nominal{static_cast<uint32_t>(std::round((1ULL << 32) / samples_per_symbol))},
symbol_phase_inc_k{static_cast<uint32_t>(std::round(symbol_phase_inc_nominal * (2.0f / 8.0f) / samples_per_symbol))},
phase_detector{static_cast<size_t>(std::round(samples_per_symbol))},
phase_accumulator{symbol_phase_inc_nominal} {
}
template<typename SymbolHandler>
void operator()(const uint32_t slicer_history, SymbolHandler symbol_handler) {
if( phase_accumulator() ) {
const auto detector_result = phase_detector(slicer_history);
phase_accumulator.set_inc(symbol_phase_inc_nominal + detector_result.error * symbol_phase_inc_k);
symbol_handler(detector_result.symbol);
}
}
template <typename SymbolHandler>
void operator()(const uint32_t slicer_history, SymbolHandler symbol_handler) {
if (phase_accumulator()) {
const auto detector_result = phase_detector(slicer_history);
phase_accumulator.set_inc(symbol_phase_inc_nominal + detector_result.error * symbol_phase_inc_k);
symbol_handler(detector_result.symbol);
}
}
private:
const uint32_t symbol_phase_inc_nominal;
const uint32_t symbol_phase_inc_k;
PhaseDetectorEarlyLateGate phase_detector;
PhaseAccumulator phase_accumulator;
private:
const uint32_t symbol_phase_inc_nominal;
const uint32_t symbol_phase_inc_k;
PhaseDetectorEarlyLateGate phase_detector;
PhaseAccumulator phase_accumulator;
};
#endif/*__OOK_HPP__*/
#endif /*__OOK_HPP__*/