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Use IFIR decimator for TPMS.

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This commit is contained in:
Jared Boone 2016-01-02 10:42:40 -08:00
parent e720bfb054
commit 410d4d7fc3
2 changed files with 52 additions and 10 deletions
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27
firmware/baseband/proc_tpms.hpp
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@ -39,22 +39,31 @@
#include <bitset>
// Translate+rectangular filter
// sample=153.6k, deviation=38400, symbol=19200
// Length: 8 taps, 1 symbols, 2 cycles of sinusoid
constexpr std::array<std::complex<float>, 8> rect_taps_153k6_1t_p { {
{ 1.2500000000e-01f, 0.0000000000e+00f }, { 0.0000000000e+00f, 1.2500000000e-01f },
{ -1.2500000000e-01f, 0.0000000000e+00f }, { 0.0000000000e+00f, -1.2500000000e-01f },
{ 1.2500000000e-01f, 0.0000000000e+00f }, { 0.0000000000e+00f, 1.2500000000e-01f },
{ -1.2500000000e-01f, 0.0000000000e+00f }, { 0.0000000000e+00f, -1.2500000000e-01f },
// sample=307.2k, deviation=38400, symbol=19200
// Length: 16 taps, 1 symbols, 2 cycles of sinusoid
constexpr std::array<std::complex<float>, 16> rect_taps_307k2_1t_p { {
{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
} };
class TPMSProcessor : public BasebandProcessor {
public:
TPMSProcessor();
void execute(const buffer_c8_t& buffer) override;
private:
ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };
dsp::matched_filter::MatchedFilter mf { rect_taps_153k6_1t_p, 4 };
std::array<complex16_t, 512> dst;
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0;
dsp::decimate::FIRC16xR16x16Decim2 decim_1;
dsp::matched_filter::MatchedFilter mf { rect_taps_307k2_1t_p, 8 };
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
38400, 19200, { 0.0555f },