Delay squelch activation by 2 ms
Delaying the squelch activation by 2 ms helps to avoid dropped samples if the signal is barely above the squelch threshold.
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@ -36,6 +36,8 @@
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#define AGC_BW_ACQUISITION 5e-2f
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#define AGC_BW_TRACKING 1e-4f
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#define SQUELCH_TIMEOUT_MS 2
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#define MAX_COARSE_FREQ_OFFSET 0.20f
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#define PLL_BW_HEADER 0.03f
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@ -216,15 +218,15 @@ static enum squelch_state_t update_and_check_squelch(layer1_rx_t *rx, unsigned i
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break;
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case LIQUID_AGC_SQUELCH_SIGNALHI:
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case LIQUID_AGC_SQUELCH_FALL:
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case LIQUID_AGC_SQUELCH_SIGNALLO:
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result = SQUELCH_OPEN;
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break;
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case LIQUID_AGC_SQUELCH_FALL:
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case LIQUID_AGC_SQUELCH_TIMEOUT:
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LOG(LVL_DEBUG, "Squelch enabled at #%zu RSSI = %.3f dB [thr: %.3f dB]", rx->sample_index, level, agc_crcf_squelch_get_threshold(rx->agc));
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// fall through
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case LIQUID_AGC_SQUELCH_SIGNALLO:
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case LIQUID_AGC_SQUELCH_ENABLED:
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case LIQUID_AGC_SQUELCH_TIMEOUT:
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result = SQUELCH_CLOSED;
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break;
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}
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@ -239,13 +241,13 @@ static bool is_squelch_open(const layer1_rx_t *rx)
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switch(agc_crcf_squelch_get_status(rx->agc)) {
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case LIQUID_AGC_SQUELCH_RISE:
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case LIQUID_AGC_SQUELCH_SIGNALHI:
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case LIQUID_AGC_SQUELCH_FALL:
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case LIQUID_AGC_SQUELCH_SIGNALLO:
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result = true;
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break;
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case LIQUID_AGC_SQUELCH_FALL:
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case LIQUID_AGC_SQUELCH_SIGNALLO:
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case LIQUID_AGC_SQUELCH_ENABLED:
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case LIQUID_AGC_SQUELCH_TIMEOUT:
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case LIQUID_AGC_SQUELCH_ENABLED:
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result = false;
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break;
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}
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@ -560,6 +562,7 @@ result_t layer1_rx_init(layer1_rx_t *rx, rx_callback_t callback)
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rx->noise_floor_level = 0.0f;
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agc_crcf_squelch_set_threshold(rx->agc, rx->noise_floor_level + 3.0f); // in dB
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agc_crcf_squelch_enable(rx->agc);
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agc_crcf_squelch_set_timeout(rx->agc, SQUELCH_TIMEOUT_MS * SYMBOL_RATE * RRC_SPS / 1000);
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// create NCOs for carrier frequency compensation
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rx->carrier_coarse_nco = nco_crcf_create(LIQUID_NCO);
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