Nella citazione in data ven 09 dic 2011 05:55:57 CET, Ben Reynwar ha
scritto:
On Thu, Dec 8, 2011 at 5:33 PM, Arturo Rinaldi<arty.n...@gmail.com> wrote:
I noticed dramatic changes in the 3.5.0 release in the generation of the
constellation points of digital modulations. So, if the easy part is to
again modify the source code to match my needs, i need some help in using
the new block :
digital.constellation_decoder_cb(arg1)
instead of
gr.constellation_decoder(arg1,arg2)
I usually used the last one where arg1 is a list containing the complex
values of a generic digital modulation and arg2 is the symbol mapping (Gray
Coding for instance). Which blocks do i need to put together to get the same
result ?
Regards, Arturo
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Simplest solution is probably:
constell = digital.digital_constellation(list_of_complex_points, [], 1, 1)
decoder = digital.constellation_decoder_cb(constell)
To get the symbol mapping you want, just choose the appropriate order
of the complex points in the list.
The 2nd, 3rd and 4th arguments to the constellation constructor while
not relevant to this example are:
- a mapping to be applied before differential encoding.
- the rotational-symmetry of the constellation
- the dimensionality of the constellation (i.e. number of complex
points that together map to one symbol)
Functions to simplify the creation of commonly used constellations can
be found in digital.bpsk, digital.qpsk, digital.psk, and digital.qam.
Ben
i made some progress in simplyfing the creation of the constellations
but i still need help in the decoding part.
I'm trying to calculate the modulation BER by using this flow graph :
http://imageshack.us/photo/my-images/819/bersimgrchomeartynetscr.png/
i removed all the unnecessary parameters to my study (excess bw ,
differential coding etc.) because i need only gray coding. and the
decoding part is this one
http://pastebin.com/wADRx7Hj
could you please help me ? the grc blocks are made by invoking only the
psk_new.py source
http://pastebin.com/kawSfuPg
modified by me. please help me. thx in advance
Regards, Arturo.
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