Editing Burst Shaper

Jump to: navigation, search

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision Your text
Line 1: Line 1:
[[Category:Block Docs]]
[[Category:Block Docs]]
Burst shaper block for applying burst padding and ramping.
[[Category:Stub Docs]]
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 applies a configurable amount of zero padding before and/or after a burst indicated by tagged stream length tags.
As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
If phasing symbols are used, an alternating pattern of +1/-1 symbols of length ceil(N/2) will be inserted before and after each burst, where N is the length of the taps vector. The ramp- up/ramp-down shape will be applied to these phasing symbols.
If phasing symbols are not used, the taper will be applied directly to the head and tail of each burst.
Length tags will be updated to include the length of any added zero padding or phasing symbols and will be placed at the beginning of the modified tagged stream. Any other tags found at the same offset as a length tag will also be placed at the beginning of the modified tagged stream, since these tags are assumed to be associated with the burst rather than a specific sample. For example, if "tx_time" tags are used to control bursts, their offsets should be consistent with their associated burst's length tags. Tags at other offsets will be placed with the samples on which they were found.
== Parameters ==
== Parameters ==
; Window Taps
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
: Vector of window taper taps; the first ceil(N/2) items are the up flank and the last ceil(N/2) items are the down flank. If taps.size() is odd, the middle tap will be used as the last item of the up flank and first item of the down flank.
; Pre-padding Length
: Number of zero samples to insert before the burst.
; Post-padding Length
: Number of zero samples to append after the burst.
; Insert Phasing Symbols
; Param 1 (''R'')
: If true, insert alternating +1/-1 pattern of length ceil(N/2) before and after the burst and apply ramp up and ramp down taps, respectively, to the inserted patterns instead of the head and tail items of the burst.
: 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).
; Length Tag Name
; Param 2
: The name of the tagged stream length tag key.
: blah blah blah
== Example Flowgraph ==
== Example Flowgraph ==

Please note that all contributions to GNU Radio are considered to be released under the Creative Commons Attribution-ShareAlike (see GNU Radio:Copyrights for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

To edit this page, please answer the question that appears below (more info):

Cancel | Editing help (opens in new window)