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rx: use different PLL BW for header and data

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This commit is contained in:
Thomas Kolb 2024-03-30 22:06:13 +01:00
parent bbf7bcf2f0
commit 79d7f74dfc
1 changed files with 10 additions and 7 deletions
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17
impl/src/layer1/rx.c
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@ -31,17 +31,20 @@
# define DEBUG_LOG(...) {}
#endif
static void update_nco_pll(nco_crcf nco, float phase_error)
#define PLL_BW_HEADER 0.03f
#define PLL_BW_DATA 0.01f
static void update_nco_pll(nco_crcf nco, float phase_error, float bw)
{
static const float pll_alpha = 0.03f; // phase adjustment factor
static const float pll_beta = (pll_alpha * pll_alpha) / 2.0f; // frequency adjustment factor
const float pll_alpha = bw; // phase adjustment factor
const float pll_beta = (pll_alpha * pll_alpha) * 1.0f; // frequency adjustment factor
nco_crcf_adjust_phase(nco, pll_alpha * phase_error);
nco_crcf_adjust_frequency(nco, pll_beta * phase_error);
DEBUG_LOG("NCO adjusted: f=%.6f, φ=%.6f\n",
/*DEBUG_LOG("NCO adjusted: f=%.6f, φ=%.6f\n",
nco_crcf_get_frequency(nco),
nco_crcf_get_phase(nco));
nco_crcf_get_phase(nco));*/
}
@ -217,7 +220,7 @@ result_t layer1_rx_process(layer1_rx_t *rx, const float complex *samples, size_t
//DEBUG_LOG("Sym: %d; Phase error: %f\n", sym_demod, phase_error);
update_nco_pll(rx->carrier_fine_nco, phase_error);
update_nco_pll(rx->carrier_fine_nco, phase_error, PLL_BW_HEADER);
symbols_int[symbol_counter] = sym_demod;
symbol_counter++;
@ -306,7 +309,7 @@ result_t layer1_rx_process(layer1_rx_t *rx, const float complex *samples, size_t
float phase_error = modem_get_demodulator_phase_error(rx->payload_demod);
//DEBUG_LOG("Sym: %d; Phase error: %f\n", sym_demod, phase_error);
update_nco_pll(rx->carrier_fine_nco, phase_error);
update_nco_pll(rx->carrier_fine_nco, phase_error, PLL_BW_DATA);
symbols_int[symbol_counter] = sym_demod;
symbol_counter++;