73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
#include <stdio.h>
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#include <time.h>
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#include <liquid/liquid.h>
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#include "layer1/freq_est.h"
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#include "utils.h"
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#define RESULT_CHECK(stmt) { \
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result_t res = stmt; \
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if(res != OK) { \
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fprintf(stderr, "Error %d in %s:%d!\n", res, __FILE__, __LINE__); \
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exit(1); \
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} \
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}
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int main(void)
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{
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#define N 63
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float complex s1[N];
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float complex s2[N];
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float complex s3[N];
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nco_crcf nco;
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channel_cccf chan;
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// ** Initialize **
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srand(time(NULL));
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nco = nco_crcf_create(LIQUID_NCO);
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nco_crcf_set_frequency(nco, -0.08f);
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nco_crcf_set_phase(nco, -1.37f);
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chan = channel_cccf_create();
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channel_cccf_add_awgn(chan, -80, 5);
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// ** Generate signal **
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for(size_t i = 0; i < N; i++) {
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s1[i] = 1.0f;
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}
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// ** Mix up **
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nco_crcf_mix_block_up(nco, s1, s2, N);
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channel_cccf_execute_block(chan, s2, N, s3);
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dump_array_cf(s1, N, 1.0f, "/tmp/freq_est_source.cpx");
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dump_array_cf(s2, N, 1.0f, "/tmp/freq_est_mixed.cpx");
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dump_array_cf(s3, N, 1.0f, "/tmp/freq_est_channelized.cpx");
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// ** Estimate frequency **
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float final_phase;
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float est_freq = freq_est_data_free(s3, N, &final_phase);
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fprintf(stderr, "Estimated frequency: %.6f rad/sample\n", est_freq);
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fprintf(stderr, "Final phase: %.6f rad\n", final_phase);
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// ** Cleanup **
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nco_crcf_destroy(nco);
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fprintf(stderr, "Done.\n");
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}
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