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https://github.com/SatDump/SatDump
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82 lines
No EOL
2.4 KiB
C++
82 lines
No EOL
2.4 KiB
C++
#pragma once
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#include <random>
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#include "common/dsp/complex.h"
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/*
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Random generator adapted from GNU Radio
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I only use gaussian as of now, but others could come in handy later so...
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Better keep them.
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*/
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namespace dsp
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{
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class Random
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{
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private:
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long d_seed;
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bool d_gauss_stored;
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float d_gauss_value;
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std::mt19937 d_rng; // mersenne twister as random number generator
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std::uniform_real_distribution<float> d_uniform; // choose uniform distribution, default is [0,1)
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std::uniform_int_distribution<> d_integer_dis;
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public:
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Random(unsigned int seed = 0, int min_integer = 0, int max_integer = 2);
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~Random();
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/*!
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* \brief Change the seed for the initialized number generator. seed = 0 initializes
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* the random number generator with the system time.
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*/
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void reseed(unsigned int seed);
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/*!
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* set minimum and maximum for integer random number generator.
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* Limits are [minimum, maximum)
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* Default: [0, std::numeric_limits< IntType >::max)]
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*/
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void set_integer_limits(const int minimum, const int maximum);
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/*!
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* Uniform random integers in the range set by 'set_integer_limits' [min, max).
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*/
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int ran_int();
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/*!
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* \brief Uniform random numbers in the range [0.0, 1.0)
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*/
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float ran1();
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/*!
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* \brief Normally distributed random numbers (Gaussian distribution with zero mean
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* and variance 1)
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*/
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float gasdev();
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/*!
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* \brief Laplacian distributed random numbers with zero mean and variance 1
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*/
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float laplacian();
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/*!
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* \brief Rayleigh distributed random numbers (zero mean and variance 1 for the
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* underlying Gaussian distributions)
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*/
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float rayleigh();
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/*!
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* \brief Exponentially distributed random numbers with values less than or equal
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* to factor replaced with zero. The underlying exponential distribution has
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* mean sqrt(2) and variance 2.
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*/
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float impulse(float factor);
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/*!
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* \brief Normally distributed random numbers with zero mean and variance 1 on real
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* and imaginary part. This results in a Rayleigh distribution for the amplitude and
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* an uniform distribution for the phase.
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*/
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complex_t rayleigh_complex();
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};
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} // namespace libdsp
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