I think you should use differential encoding with DPSK Mod/DPSK Demod
block because the receiver doesn't know the phase used.
Also, if you want to test the reliability of your flowgraph, you can
replace your USRP source and sink with a Channel Model and play with
the frequency, noise, etc...
Timothée.
Le dim. 29 nov. 2015 à 5:53, Ekko <[email protected]> a écrit
:
hi
follow your suggestion ,i use the "PSK mod" and "PSK demod",just like
is it clear，if not i will upload my grc file
now,i set the vector source ,vector="0,1,2,3,4,5,6,7,8,9"
and i transmit it,receive it into a file
i found that in my file,it is not the sequence in vector source
0123456789,just the part of this sequence.i think that some number
was lose.(is it right?)
i want to know how to Reduced this lost of number,for example some
block need to be added.
the "psk demod" got the freq and phase correction itself.
and waht is the delimited messages.
thank you
--Ekko
2015-11-29 1:26 GMT+08:00 Timothée COCAULT
<[email protected]>:
Hi,
First you should have a look at the PSK demodulation tutorial :
http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorial_PSK_Demodulation
.
It uses a Polyphase Clock Sync between the receiver and the
constellation decoder.
Alternatively, you can use the Constellation Receiver which is a
Constellation Decoder with freq and phase correction.
But if you want a more simple solution, the DPSK Mod/DPSK Demod
blocks seems like the best solution.
When your receiver works, you can have a look at the Packet
Operators to send delimited messages.
Good luck.
Le sam. 28 nov. 2015 à 9:55, Ekko <[email protected]> a
écrit :
hello all
i want to transmit a file with the way of QPSK
this is my send grc
file source----repack bits-----chunks to symbol-----multile
const------uhd_ink
this is my receive grc
uhd_source-----constellation decoder-----repack bits-----file sink
next is the "qt gui constellation sink" of the oupotput of
chunks to symbol in the send
next is the output of UHD_source in recieve "qt frequence sink""qt
gui constellation sink"
in this picture ,i think the recieve got the signal,but i do not
know the constellation mean,
next is the set of my uhd_source and uhd_sink
source
sink
my problem is that my recieve file is completely different with
the source file
i use simulation way (no uhd),the recieve is same as source,
so i think there is some block needed between the constellation
coder and uhd_source,for example the sync block
hope someone knows how to solve this sync problem or how to
transmit a file with QPSK on e310 with the antenna
thank you
---Ekko
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