Difference between revisions of "Channel Model"

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[[Category:Block Docs]]
 
[[Category:Block Docs]]
[[Category:Stub Docs]]
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A basic channel model simulator that can be used to help evaluate, design, and test various signals, waveforms, and algorithms.  This model allows the user to set the voltage of an AWGN noise source (), a (normalized) frequency offset (), a sample timing offset (), and a seed () to randomize or make reproducible the AWGN noise source. Multipath can be approximated in this model by using a FIR filter representation of a multipath delay profile with the parameter. To simulate a channel with time-variant channel, use [[Channel Model 2]].
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.
 
  
 
== 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'')
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; Noise Voltage (''R'')
: 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).
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: The AWGN noise level as a voltage (to be calculated externally to meet, say, a desired SNR).
 +
 
 +
; Frequency Offset (''R'')
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: The normalized frequency offset. 0 is no offset; 0.25 would be, for a digital modem, one quarter of the symbol rate.
 +
 
 +
; Epsilon (''R'')
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: The sample timing offset to emulate the different rates between the sample clocks of the transmitter and receiver. 1.0 is no difference.
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 +
; Taps (''R'')
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: Taps of a FIR filter to emulate a multipath delay profile.
  
; Param 2
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; Seed
: blah blah blah
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: A random number generator seed for the noise source.
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; Block Tag Propagation
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: If true, tags will not be able to propagate through this block.
  
 
== Example Flowgraph ==
 
== 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.
 
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.
 
  
  

Revision as of 04:06, 20 July 2019

A basic channel model simulator that can be used to help evaluate, design, and test various signals, waveforms, and algorithms. This model allows the user to set the voltage of an AWGN noise source (), a (normalized) frequency offset (), a sample timing offset (), and a seed () to randomize or make reproducible the AWGN noise source. Multipath can be approximated in this model by using a FIR filter representation of a multipath delay profile with the parameter. To simulate a channel with time-variant channel, use Channel Model 2.

Parameters

(R): Run-time adjustable

Noise Voltage (R)
The AWGN noise level as a voltage (to be calculated externally to meet, say, a desired SNR).
Frequency Offset (R)
The normalized frequency offset. 0 is no offset; 0.25 would be, for a digital modem, one quarter of the symbol rate.
Epsilon (R)
The sample timing offset to emulate the different rates between the sample clocks of the transmitter and receiver. 1.0 is no difference.
Taps (R)
Taps of a FIR filter to emulate a multipath delay profile.
Seed
A random number generator seed for the noise source.
Block Tag Propagation
If true, tags will not be able to propagate through this block.

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
TODO
Header files
TODO
Public header files
TODO
Block definition
TODO