43 lines
1.7 KiB
C
Executable File
43 lines
1.7 KiB
C
Executable File
#pragma once
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#include "liquid.h"
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typedef struct _SYMTRACK_ {
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// parameters
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int filter_type; // filter type (e.g. LIQUID_FIRFILT_RRC)
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unsigned int k; // samples/symbol
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unsigned int m; // filter semi-length
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float beta; // filter excess bandwidth
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int mod_scheme; // demodulator
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// automatic gain control
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agc_crcf agc; // agc object
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float agc_bandwidth; // agc bandwidth
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// symbol timing recovery
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symsync_crcf symsync; // symbol timing recovery object
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float symsync_bandwidth; // symsync loop bandwidth
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liquid_float_complex symsync_buf[8]; // symsync output buffer
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unsigned int symsync_index; // symsync output sample index
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// equalizer/decimator
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eqlms_cccf eq; // equalizer (LMS)
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unsigned int eq_len; // equalizer length
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float eq_bandwidth; // equalizer bandwidth
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enum {
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SYMTRACK_EQ_CM, // equalizer strategy: constant modulus
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SYMTRACK_EQ_DD, // equalizer strategy: decision directed
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SYMTRACK_EQ_OFF, // equalizer strategy: disabled
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} eq_strategy;
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// nco/phase-locked loop
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nco_crcf nco; // nco (carrier recovery)
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float pll_bandwidth; // phase-locked loop bandwidth
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// demodulator
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modem demod; // linear modem demodulator
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// state and counters
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unsigned int num_syms_rx; // number of symbols recovered
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} SYMTRACK;
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