Re: [Discuss-gnuradio] DPSK Modulator and Demodulator

[marcin_w]

You can't connect the file source directly to the Modulator. If you are Using
DBPSK, the modulator will be looking for 1 bit at a time, or in this case a
byte with only 1 significant bit. 

Use

File Source > packed to unpacked [1 bit per chunk] MSB first > DBPSK
Modulator

Marcin


David Barton-4 wrote:
> 
> Hi,
> 
> I am having trouble the the DBPSK mod and demod blocks. My flow graph is:
> file source -> DBPSKmod -> DBPSKdemod -> file sink
> 
> The file source is a 2 byte text file set to not repeat
> The default parameters were used for the DBPSKmod and demod blocks
> (including 2 Samples/Symbol)
> When I run the graph the output text file becomes 13 bytes long and they
> are almost all zeros. I am not sure how it gets to be that length.
> 
> I tried connecting the ouput of the DBPSKmod directly to the file sink and
> the file size was 256 bytes. This matched my expectations based on:
> 2bytes input file * 8bits/byte  *  1Symbol/bit  *  2 complex
> samples/Symbol* 8bytes /complex sample = 256 byte output file. 
> 
> If anyone knows why the output file of the whole graph would be 13 bytes 
> or if I am missing something please let me know.
> 
> Thanks,
> Dave
> 
> 
> 
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