Re: [Discuss-gnuradio] Modulation problem ?

[irene159]

Steven Clark-2 wrote:
> 
> This is not surprising. It is likely that you are getting some initial
> garbage (non-standard-ascii characters) coming out, or that you have
> some bit errors.
> 
> Don't open it in gedit. Try:
> python
> f = open('Resultat.txt')
> d = f.read()
> f.close()
> print(len(d))
> print(d)
> (or if d is really long, print(d[:50])) 
> 


When I tried this and 
       $ cat Resultat.txt
or even
       $ less Resultat.txt 
on the Terminal I didn't see anything at first but copying what seemed empty
into a file, I got:

















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>>> 



George Nychis wrote:
> 
> I'm on a mobile so I can't look at the files. But look at the file  
> sink type of your final output and the block that feeds it. My guess  
> is that its of type float or something where each float represents a  
> bit in "unpacked" binary format.... Not the bit packed ASCII you are  
> expecting. 
> 

The file sink type of my final output is gr.sizeof_char and the block that
feeds it is 
objDemod = dqpsk.dqpsk_demod() whose output type is a stream of bits packed
1 bit per byte (LSB):
     objDemod = dqpsk.dqpsk_demod()
     fg.connect(gr.file_source(gr.sizeof_gr_complex, "Modulated.dat"),
objDemod,                                                         
                                                              
gr.file_sink(gr.sizeof_char,"Resultat.txt"))
Is this correct?
I have seen an example of almost identical code working with dbpsk instead
of dqpsk[1].

However there might be an important difference (I am only a beginner and I
am not really sure of the impact it can have). In DBPSK last block (the
block feeding the result file) is:
self.unpack = gr.unpacked_to_packed_bb(self.bits_per_symbol(),
gr.GR_MSB_FIRST)

While as for DQPSK, it is:
self.unpack = gr.unpack_k_bits_bb(self.bits_per_symbol())



Ed Criscuolo-2 wrote:
> 
> Eric Blossom wrote:
>> How about:
>> 
>>   $ cat Resultat.txt
>> 
>> or
>> 
>>   $ less Resultat.txt
>> 
> 
> 
> Or :
> 
> od -tx1 Resultat.txt | less
> 
> 
> to get hex bytes to see what's going on at a binary level.
> 
> 
> @(^.^)@  Ed
> 
> 

Result was :


0000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01
0000040 00 00 00 00 00 00 01 01 01 01 01 01 01 01 00 00
0000060 00 00 00 00 00 01 00 00 00 01 01 01 00 01 00 00
0000100 01 01 01 00 00 01 00 01 00 01 00 01 00 00 01 00
0000120 00 00 00 00 00 01 00 01 00 00 01 00 00 01 01 00
0000140 00 00 00 01 00 01 01 00 00 01 00 00 00 01 01 00
0000160 01 00 00 01 00 01 01 00 01 01 01 01 00 00 00 00
0000200 01 00 01 00 00 00 00 00 01 00 01 00 00 01 00 01
0000220 00 00 00 00 00 01 01 01 00 00 01 00 00 01 01 00
0000240 01 01 01 01 00 01 01 00 01 00 01 00 00 01 01 00
0000260 00 01 00 01 00 01 01 00 00 00 01 01 00 01 01 01
0000300 00 01 00 00 00 00 01 00 00 00 00 00 00 01 01 00
0000320 01 01 00 01 00 01 01 00 00 01 00 01 00 01 01 00
0000340 01 01 00 01 00 01 01 00 00 00 01 00 00 01 01 00
0000360 00 01 00 01 00 01 01 01 00 00 01 00 00 01 01 01
0000400 00 00 01 01 00 00 01 01 01 00 01 00 00 00 01 00
0000420 00 00 00 00 00 01 00 01 01 00 01 00 00 01 01 00

...

I would like to be sure data has been modulated/demodulated correctly.
Isn't there a way of opening this file as text?

Thank you for your help,
Irene

 

[1] - http://www.wu.ece.ufl.edu/projects/softwareRadio/#Related%20Work

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