jdsca tests

lib/qpsk.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <liquid/liquid.h>
+#include "oscillator.h"
+#include "bit_ring.h"
+
+typedef struct {
+	Oscillator    carrier;        // IF carrier (e.g. 3 kHz)
+	firfilt_rrrf  fir_i, fir_q;   // liquid RRC matched-filter shapers
+	float        *q_delay;
+	int           q_delay_len;
+	int           q_delay_pos;
+	int           sps;            // samples per symbol
+	int           symbol_clock;
+	float         sym_i, sym_q;
+	bit_ring_t   *bitring;
+	uint8_t       last_bits[2];   // hold last symbol if bitring runs dry
+} OQPSKMod;
+
+void  oqpsk_init(OQPSKMod *m, float if_freq, float sample_rate, float symbol_rate, float alpha, bit_ring_t *bitring);
+float oqpsk_process(OQPSKMod *m);
+void  oqpsk_destroy(OQPSKMod *m);