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Improve OOK phase advance algorithm.

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Now independent of samples/symbol, adjusts up to 1/8 of a cycle per symbol.
This commit is contained in:
Jared Boone 2016-06-01 15:20:23 -07:00
parent 57767004a2
commit 36eefa46e7
1 changed files with 3 additions and 1 deletions
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4
firmware/baseband/ook.hpp
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@ -70,6 +70,7 @@ public:
constexpr OOKClockRecovery( constexpr OOKClockRecovery(
const float samples_per_symbol const float samples_per_symbol
) : symbol_phase_inc_nominal { static_cast<uint32_t>(std::round((1ULL << 32) / samples_per_symbol)) }, ) : symbol_phase_inc_nominal { static_cast<uint32_t>(std::round((1ULL << 32) / samples_per_symbol)) },
symbol_phase_inc_k { symbol_phase_inc_nominal * (2.0f / 8.0f) / samples_per_symbol },
phase_detector { samples_per_symbol }, phase_detector { samples_per_symbol },
phase_accumulator { symbol_phase_inc_nominal } phase_accumulator { symbol_phase_inc_nominal }
{ {
@ -79,13 +80,14 @@ public:
void operator()(const uint32_t slicer_history, SymbolHandler symbol_handler) { void operator()(const uint32_t slicer_history, SymbolHandler symbol_handler) {
if( phase_accumulator() ) { if( phase_accumulator() ) {
const auto detector_result = phase_detector(slicer_history); const auto detector_result = phase_detector(slicer_history);
phase_accumulator.set_inc(symbol_phase_inc_nominal + detector_result.error * (symbol_phase_inc_nominal >> 3)); phase_accumulator.set_inc(symbol_phase_inc_nominal + detector_result.error * symbol_phase_inc_k);
symbol_handler(detector_result.symbol); symbol_handler(detector_result.symbol);
} }
} }
private: private:
const uint32_t symbol_phase_inc_nominal; const uint32_t symbol_phase_inc_nominal;
const uint32_t symbol_phase_inc_k;
PhaseDetectorEarlyLateGate phase_detector; PhaseDetectorEarlyLateGate phase_detector;
PhaseAccumulator phase_accumulator; PhaseAccumulator phase_accumulator;
}; };