Channel Model 2: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Basic channel simulator allowing time-varying frequency and timing inputs.
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.
This block implements 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 (), an initial timing offset (), and a seed () to randomize 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 .
Unlike [[Channel Model]], this block is designed to enable time-varying frequency and timing offsets.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
Since the models for frequency and timing offset may vary and what we are trying to model may be different for different simulations, we provide the time-varying nature as an input function that is user-defined. If only constant frequency and timing offsets are required, it is easier and less expensive to use [[Channel Model]].


== 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'')
; 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).
: The AWGN noise level as a voltage (to be calculated externally to meet, say, a desired SNR).
 
; Timing Offset (''R'')
:
 
; Taps (''R'')
: Taps of a FIR filter to emulate a multipath delay profile. Default is 1+1j meaning a single tap, and thus no multipath.
 
; 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.


; Param 2
: blah blah blah


== Example Flowgraph ==
== Example Flowgraph ==

Revision as of 04:08, 20 July 2019

Basic channel simulator allowing time-varying frequency and timing inputs. This block implements 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 (), an initial timing offset (), and a seed () to randomize 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 . Unlike Channel Model, this block is designed to enable time-varying frequency and timing offsets.

Since the models for frequency and timing offset may vary and what we are trying to model may be different for different simulations, we provide the time-varying nature as an input function that is user-defined. If only constant frequency and timing offsets are required, it is easier and less expensive to use Channel Model.

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).
Timing Offset (R)
Taps (R)
Taps of a FIR filter to emulate a multipath delay profile. Default is 1+1j meaning a single tap, and thus no multipath.
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