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/* -*- c++ -*- */
/*
* Copyright 2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef FLAT_FADER_IMPL_H
#define FLAT_FADER_IMPL_H
#include "sincostable.h"
#include <gnuradio/fxpt.h>
#include <gnuradio/io_signature.h>
#include <stdint.h>
#include <random>
// FASTSINCOS: 0 = slow native, 1 = gr::fxpt impl, 2 = sincostable.h
#define FASTSINCOS 2
namespace gr {
namespace channels {
class flat_fader_impl
{
private:
// initial theta variate generator
std::mt19937 rng_1;
std::uniform_real_distribution<double> dist_1; // U(-pi,pi)
// random walk variate
std::mt19937 rng_2;
std::uniform_real_distribution<double> dist_2; // U(0,1)
public:
int d_N; // number of sinusoids
float d_fDTs; // normalized maximum doppler frequency
double d_theta; // random walk variable (RWP)
float d_theta_los;
float d_step; // maximum random walk step size
uint64_t d_m; // sample counter
float d_K; // Rician factor (ratio of the specular power to the scattered power)
bool d_LOS; // LOS path exists? chooses Rician (LOS) vs Rayleigh (NLOS) model.
std::vector<float> d_psi; // in-phase initial phase
std::vector<float> d_phi; // quadrature initial phase
std::vector<float> d_costable;
sincostable d_table;
float scale_sin, scale_los, scale_nlos;
void update_theta();
flat_fader_impl(uint32_t N, float fDTs, bool LOS, float K, uint32_t seed);
gr_complex next_sample();
void next_samples(std::vector<gr_complex>& HVec, int n_samples);
}; /* class flat_fader_impl */
} /* namespace channels */
} /* namespace gr */
#endif // FLAT_FADER_IMPL_H
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