IFFT type Fading generator class. More...
#include <itpp/comm/channel.h>
Public Member Functions | |
IFFT_Fading_Generator (double norm_doppler) | |
Default constructor. | |
virtual | ~IFFT_Fading_Generator () |
Destructor. | |
virtual void | init () |
Initialize the generator. | |
virtual void | generate (int no_samples, cvec &output) |
Generate no_samples values from the fading process. | |
virtual void | generate (int no_samples, cvec &output)=0 |
Generate no_samples values from the fading process. | |
virtual void | generate (int no_samples, cvec &output)=0 |
Generate no_samples values from the fading process. | |
cvec | generate (int no_samples) |
Generate no_samples values from the fading process. | |
virtual void | set_norm_doppler (double norm_doppler) |
Set normalized Doppler. | |
virtual void | set_LOS_doppler (double relative_doppler) |
Set relative Doppler (compared to the maximum Doppler) for the LOS component. | |
virtual void | set_time_offset (int offset) |
Set time offset in samples. | |
virtual double | get_norm_doppler () const |
Return normalized Doppler. | |
virtual double | get_LOS_doppler () const |
Get relative Doppler (compared to the maximum doppler) for the LOS component. | |
virtual double | get_time_offset () const |
Get time offset in samples. | |
virtual void | shift_time_offset (int no_samples) |
Shift generator time offset by a number of samples. | |
void | set_LOS_power (double relative_power) |
Set relative LOS power. | |
virtual void | set_filter_length (int filter_length) |
Set FIR filter length (for FIR fading generator) | |
virtual void | set_doppler_spectrum (DOPPLER_SPECTRUM spectrum) |
Set Doppler spectrum (for Rice fading generator) | |
virtual void | set_no_frequencies (int no_freq) |
Set number of sine frequencies (for Rice fading generator) | |
virtual void | set_rice_method (RICE_METHOD method) |
Set calculation method of Doppler frequencies and amplitudes (for Rice fading generator) | |
double | get_LOS_power () const |
Get relative power of LOS component (Rice factor) | |
virtual int | get_filter_length () const |
Set FIR filter length (for FIR fading generator) | |
virtual DOPPLER_SPECTRUM | get_doppler_spectrum () const |
Return Doppler spectrum (for Rice fading generator) | |
virtual int | get_no_frequencies () const |
Get number of sine frequencies (for Rice fading generator) | |
virtual RICE_METHOD | get_rice_method () const |
Get calculation method of Doppler frequencies and amplitudes (for Rice fading generator) | |
Protected Member Functions | |
void | generate_Jakes (int no_samples, cvec &output) |
Generator for Jakes spectrum. | |
void | add_LOS (int idx, std::complex< double > &sample) |
add LOS component to the sample with index idx | |
Protected Attributes | |
double | n_dopp |
Normalized maximum Doppler frequency. | |
double | los_dopp |
Relative Doppler on LOS component (0.7 by default) | |
double | time_offset |
Time offset in samples (time state in the generator) | |
bool | init_flag |
signals if generator is initialized or not | |
double | los_power |
Relative power of LOS component compared to diffuse component (K factor) | |
double | los_diffuse |
Diffuse component: sqrt(1 / (1 + los_power)) | |
double | los_direct |
Direct component: sqrt(los_power / (1 + los_power)) | |
IFFT type Fading generator class.
A IFFT generator is a frequency domain filter implementation of filter method for generation of a fading process. Parameters that define the generator is the normalized Doppler.
The method is block-based and consecutive blocks are independent fading. The method is very efficient for large blocks. The size of the FFT,
References:
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inline |
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inlinevirtual |
Initialize the generator.
Implements itpp::Correlated_Fading_Generator.
Definition at line 612 of file channel.h.
Referenced by generate().
Generate no_samples values from the fading process.
Implements itpp::Correlated_Fading_Generator.
Definition at line 468 of file channel.cpp.
References itpp::Correlated_Fading_Generator::add_LOS(), generate_Jakes(), init(), itpp::Fading_Generator::init_flag, itpp::Fading_Generator::los_power, and itpp::Correlated_Fading_Generator::time_offset.
Generator for Jakes spectrum.
Definition at line 484 of file channel.cpp.
References itpp::ceil_i(), itpp::concat(), itpp::ifft(), it_assert, itpp::levels2bits(), itpp::linspace(), itpp::Correlated_Fading_Generator::n_dopp, itpp::norm(), itpp::pi, itpp::pow2i(), itpp::randn_c(), itpp::reverse(), itpp::Array< T >::size(), itpp::zeros(), and itpp::zeros_c().
Referenced by generate().
Generate no_samples values from the fading process.
Implements itpp::Correlated_Fading_Generator.
Generate no_samples values from the fading process.
Implements itpp::Correlated_Fading_Generator.
cvec itpp::Fading_Generator::generate | ( | int | no_samples | ) |
Generate no_samples values from the fading process.
Definition at line 418 of file channel.cpp.
Set normalized Doppler.
Reimplemented from itpp::Fading_Generator.
Definition at line 210 of file channel.cpp.
References itpp::Fading_Generator::init_flag, it_assert, and itpp::Correlated_Fading_Generator::n_dopp.
Referenced by itpp::Correlated_Fading_Generator::Correlated_Fading_Generator().
Set relative Doppler (compared to the maximum Doppler) for the LOS component.
Reimplemented from itpp::Fading_Generator.
Definition at line 218 of file channel.cpp.
References it_assert, and itpp::Correlated_Fading_Generator::los_dopp.
Set time offset in samples.
Reimplemented from itpp::Fading_Generator.
Definition at line 225 of file channel.cpp.
References itpp::Correlated_Fading_Generator::time_offset.
Return normalized Doppler.
Reimplemented from itpp::Fading_Generator.
Get relative Doppler (compared to the maximum doppler) for the LOS component.
Reimplemented from itpp::Fading_Generator.
Get time offset in samples.
Reimplemented from itpp::Fading_Generator.
Shift generator time offset by a number of samples.
Reimplemented from itpp::Fading_Generator.
Definition at line 230 of file channel.cpp.
References itpp::Correlated_Fading_Generator::time_offset.
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protectedinherited |
add LOS component to the sample with index idx
Definition at line 235 of file channel.cpp.
References itpp::Fading_Generator::los_diffuse, itpp::Fading_Generator::los_direct, itpp::Correlated_Fading_Generator::los_dopp, itpp::m_2pi, itpp::Correlated_Fading_Generator::n_dopp, and itpp::Correlated_Fading_Generator::time_offset.
Referenced by itpp::Rice_Fading_Generator::generate(), itpp::FIR_Fading_Generator::generate(), and generate().
Set relative LOS power.
Definition at line 57 of file channel.cpp.
References it_assert, itpp::Fading_Generator::los_diffuse, itpp::Fading_Generator::los_direct, and itpp::Fading_Generator::los_power.
Referenced by itpp::Fading_Generator::Fading_Generator().
Set FIR filter length (for FIR fading generator)
Reimplemented in itpp::FIR_Fading_Generator.
Definition at line 81 of file channel.cpp.
References it_warning.
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virtualinherited |
Set Doppler spectrum (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 86 of file channel.cpp.
References it_warning.
Set number of sine frequencies (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 91 of file channel.cpp.
References it_warning.
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virtualinherited |
Set calculation method of Doppler frequencies and amplitudes (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 96 of file channel.cpp.
References it_warning.
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inlineinherited |
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virtualinherited |
Set FIR filter length (for FIR fading generator)
Reimplemented in itpp::FIR_Fading_Generator.
Definition at line 113 of file channel.cpp.
References it_warning.
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virtualinherited |
Return Doppler spectrum (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 125 of file channel.cpp.
References it_warning.
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virtualinherited |
Get number of sine frequencies (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 131 of file channel.cpp.
References it_warning.
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virtualinherited |
Get calculation method of Doppler frequencies and amplitudes (for Rice fading generator)
Reimplemented in itpp::Rice_Fading_Generator.
Definition at line 137 of file channel.cpp.
References it_warning.
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protectedinherited |
Normalized maximum Doppler frequency.
Definition at line 424 of file channel.h.
Referenced by itpp::Correlated_Fading_Generator::add_LOS(), itpp::Rice_Fading_Generator::generate(), generate_Jakes(), itpp::FIR_Fading_Generator::init(), and itpp::Correlated_Fading_Generator::set_norm_doppler().
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protectedinherited |
Relative Doppler on LOS component (0.7 by default)
Definition at line 425 of file channel.h.
Referenced by itpp::Correlated_Fading_Generator::add_LOS(), and itpp::Correlated_Fading_Generator::set_LOS_doppler().
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protectedinherited |
Time offset in samples (time state in the generator)
Definition at line 426 of file channel.h.
Referenced by itpp::Correlated_Fading_Generator::add_LOS(), itpp::Rice_Fading_Generator::generate(), itpp::FIR_Fading_Generator::generate(), generate(), itpp::Correlated_Fading_Generator::set_time_offset(), and itpp::Correlated_Fading_Generator::shift_time_offset().
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protectedinherited |
signals if generator is initialized or not
Definition at line 282 of file channel.h.
Referenced by itpp::Independent_Fading_Generator::generate(), itpp::Static_Fading_Generator::generate(), itpp::Rice_Fading_Generator::generate(), itpp::FIR_Fading_Generator::generate(), generate(), itpp::Static_Fading_Generator::init(), itpp::Rice_Fading_Generator::set_doppler_spectrum(), itpp::FIR_Fading_Generator::set_filter_length(), itpp::Rice_Fading_Generator::set_no_frequencies(), itpp::Correlated_Fading_Generator::set_norm_doppler(), and itpp::Rice_Fading_Generator::set_rice_method().
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protectedinherited |
Relative power of LOS component compared to diffuse component (K factor)
Definition at line 283 of file channel.h.
Referenced by itpp::Independent_Fading_Generator::generate(), itpp::Rice_Fading_Generator::generate(), itpp::FIR_Fading_Generator::generate(), generate(), itpp::Static_Fading_Generator::init(), and itpp::Fading_Generator::set_LOS_power().
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protectedinherited |
Diffuse component: sqrt(1 / (1 + los_power))
Definition at line 284 of file channel.h.
Referenced by itpp::Correlated_Fading_Generator::add_LOS(), itpp::Independent_Fading_Generator::generate(), itpp::Static_Fading_Generator::init(), and itpp::Fading_Generator::set_LOS_power().
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protectedinherited |
Direct component: sqrt(los_power / (1 + los_power))
Definition at line 285 of file channel.h.
Referenced by itpp::Correlated_Fading_Generator::add_LOS(), itpp::Independent_Fading_Generator::generate(), itpp::Static_Fading_Generator::init(), and itpp::Fading_Generator::set_LOS_power().
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