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78 lines
3.2 KiB
C++
78 lines
3.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2026 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include "mainbench.h"
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#include "dsp/fftfilterrrc.h"
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#include <QDebug>
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void MainBench::testFFTRRCFilter()
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{
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qDebug() << "MainBench::testFFTRRCFilter";
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const int RRC_FFT_SIZE = 512;
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std::complex<float>* rrcFilterOut = nullptr;
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FFTFilterRRC filter(RRC_FFT_SIZE);
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filter.create(0.05f, 0.35f); // 2400 baud, 0.35 rolloff
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qDebug() << "MainBench::testFFTRRCFilter: filter created";
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FILE *fd_filter = fopen("test_rrc_filter.txt", "w");
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for (int i = 0; i < RRC_FFT_SIZE; i++) {
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fprintf(fd_filter, "%f\n", std::abs(filter.getFilter()[i]));
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}
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qDebug() << "MainBench::testFFTRRCFilter: filter coefficients written to test_rrc_filter.txt";
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fclose(fd_filter);
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qDebug() << "MainBench::testFFTRRCFilter: running filter";
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FILE *fd = fopen("test_rrc.txt", "w");
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int outLen = 0;
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for (int i = 0; i < 5000; i++)
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{
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int ss = 48000 / 2400; // Samples per symbol at 2400 baud
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int d = i / ss; // Symbol index at 2400 baud
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Real s = (d % 2 == 0) ? 1.0f : -1.0f; // BPSK symbol sequence
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Real x = (i % ss == 0 ? s : 0.0f); // Pulsed signal at 2400 Hz
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// Real phi = i * (1200.0 / 48000.0) * (2*3.141);
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// Real x = sin(phi) > 0.0 ? 1.0f : -1.0f; // Simulate a BPSK signal at 1200 baud
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filter.process(Complex(x, 0.0f), &rrcFilterOut);
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outLen++;
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if (outLen % (RRC_FFT_SIZE / 2) == 0)
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{
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// printf("\ni=%d n_out: %d\n", i, n_out);
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for (int j = 0; j < outLen; j++)
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{
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Complex rrc = rrcFilterOut[j];
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fprintf(fd, "%f\n", rrc.real());
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}
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outLen = 0;
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}
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}
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// output any remaining samples
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for (int j = 0; j < outLen; j++)
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{
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Complex rrc = rrcFilterOut[j];
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fprintf(fd, "%f\n", rrc.real());
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}
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qDebug() << "MainBench::testFFTRRCFilter: output samples written to test_fftrrc.txt";
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fclose(fd);
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}
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