OFDM Transmitter: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Hierarchical block for OFDM modulation.
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.
The input is a byte stream (unsigned char) and the output is the complex modulated signal at baseband.


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


; Param 1 (''R'')
; FFT Length
: 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 length of FFT (integer).


; Param 2
; Cyclic Prefix Length
: blah blah blah
: The length of cyclic prefix in total samples (integer).
 
; Packet Length Tag Key
: The name of the tag giving packet length at the input.
 
; Occupied Carriers
: A vector of vectors describing which OFDM carriers are occupied.
 
; Pilot Carriers
: A vector of vectors describing which OFDM carriers are occupied with pilot symbols.
 
; Pilot Symbols
: The pilot symbols.
 
; Sync Word 1
: The first sync preamble symbol. This has to be with zeros on alternating carriers. Used for fine and coarse frequency offset and timing estimation.
 
; Sync Word 2
: The second sync preamble symbol. This has to be filled entirely. Also used for coarse frequency offset and channel estimation.
 
; Header Modulation
:
 
; Payload Modulation
:
 
; Rolloff length (samples)
: The rolloff length in samples. Must be smaller than the CP.
 
; Scramble Bits
: Activates the scramblers (set this to True unless debugging)
 
; Log Debug Info
: Write output into log files (Warning: creates lots of data!)


== Example Flowgraph ==
== Example Flowgraph ==
Line 20: Line 51:
== Source Files ==
== Source Files ==


; C++ files
; Python files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/python/digital/ofdm_txrx.py]
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
 
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]


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

Revision as of 15:59, 9 September 2019

Hierarchical block for OFDM modulation.

The input is a byte stream (unsigned char) and the output is the complex modulated signal at baseband.

Parameters

FFT Length
The length of FFT (integer).
Cyclic Prefix Length
The length of cyclic prefix in total samples (integer).
Packet Length Tag Key
The name of the tag giving packet length at the input.
Occupied Carriers
A vector of vectors describing which OFDM carriers are occupied.
Pilot Carriers
A vector of vectors describing which OFDM carriers are occupied with pilot symbols.
Pilot Symbols
The pilot symbols.
Sync Word 1
The first sync preamble symbol. This has to be with zeros on alternating carriers. Used for fine and coarse frequency offset and timing estimation.
Sync Word 2
The second sync preamble symbol. This has to be filled entirely. Also used for coarse frequency offset and channel estimation.
Header Modulation
Payload Modulation
Rolloff length (samples)
The rolloff length in samples. Must be smaller than the CP.
Scramble Bits
Activates the scramblers (set this to True unless debugging)
Log Debug Info
Write output into log files (Warning: creates lots of data!)

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

Python files
[1]
Block definition
[2]
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