Frequency Selective Fading Model2: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
This block implements a basic fading model simulator that can be used to help evaluate, design, and test various signals, waveforms, and algorithms.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
; References
: The flat-fading portion of the algorithm implements the following
      Compact Rayleigh and Rician fading simulator based on random walk processes
      A. Alimohammad S.F. Fard B.F. Cockburn C. Schlegel
      26th November 2008
(Algorithm III with a novel addition of time delay tap random walk )
 
: The frequency selective extension of the block roughly implements
      A Low-Complexity Hardware Implementation of Discrete-Time
      Frequency-Selective Rayleigh Fading Channels
      F. Ren and Y. Zheng
      24-27 May 2009


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; Num Sinusoids (Stochastic SoS model + delay drift)
: Description of parameter, provide any tips or recommended values.  Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: Number of sinusoids used to simulate gain on each ray
 
; Normalized Max Doppler (fD*Ts) (''R'')
: Normalized maximum doppler frequency (f_doppler / f_samprate)
 
; LOS Model
: LOS path exists? chooses Rician (LOS) vs Rayleigh (NLOS) model.
 
; Rician factor (K) (''R'')
: Rician factor (ratio of the specular power to the scattered power)
 
; Seed
: Noise seed
 
; PDP Delays (samp)
: Time delay in the fir filter (in samples) for each arriving Wide-Sense Stationary Uncorrelated Scattering (WSSUS) Ray
 
; PDP Delay StdDev (per samp)
: A vector of values that specify the gaussian step size std of delays
 
; PDP Delay Max-Dev (per samp)
: A vector of values that specify the max deviation of each delay component
 
; PDP Magnitudes
: Magnitude corresponding to each WSSUS Ray


; Param 2
; Num Taps
: blah blah blah
: Number of FIR taps to use in selective fading model


== Example Flowgraph ==
== Example Flowgraph ==
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; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-channels/lib/selective_fading_model2_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-channels/lib/selective_fading_model2_impl.h]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-channels/include/gnuradio/channels/selective_fading_model2.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-channels/grc/channels_selective_fading_model2.block.yml]

Latest revision as of 19:42, 14 January 2024

This block implements a basic fading model simulator that can be used to help evaluate, design, and test various signals, waveforms, and algorithms.

References
The flat-fading portion of the algorithm implements the following
      Compact Rayleigh and Rician fading simulator based on random walk processes
      A. Alimohammad S.F. Fard B.F. Cockburn C. Schlegel
      26th November 2008

(Algorithm III with a novel addition of time delay tap random walk )

The frequency selective extension of the block roughly implements
      A Low-Complexity Hardware Implementation of Discrete-Time
      Frequency-Selective Rayleigh Fading Channels
      F. Ren and Y. Zheng
      24-27 May 2009

Parameters

(R): Run-time adjustable

Num Sinusoids (Stochastic SoS model + delay drift)
Number of sinusoids used to simulate gain on each ray
Normalized Max Doppler (fD*Ts) (R)
Normalized maximum doppler frequency (f_doppler / f_samprate)
LOS Model
LOS path exists? chooses Rician (LOS) vs Rayleigh (NLOS) model.
Rician factor (K) (R)
Rician factor (ratio of the specular power to the scattered power)
Seed
Noise seed
PDP Delays (samp)
Time delay in the fir filter (in samples) for each arriving Wide-Sense Stationary Uncorrelated Scattering (WSSUS) Ray
PDP Delay StdDev (per samp)
A vector of values that specify the gaussian step size std of delays
PDP Delay Max-Dev (per samp)
A vector of values that specify the max deviation of each delay component
PDP Magnitudes
Magnitude corresponding to each WSSUS Ray
Num Taps
Number of FIR taps to use in selective fading model

Example Flowgraph

Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.

Source Files

C++ files
[1]
Header files
[2]
Public header files
[3]
Block definition
[4]
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