Re: [Discuss-gnuradio] DPSK Modulator and Demodulator

[marcin_w]

My mistake, i didn't realise you were using the available DBPSK block. The
Packed to Unpacked block is already part of this Modulator, so disregard my
comment.

Marcin


marcin_w wrote:
> 
> 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
>> 
>> 
>> 
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
>> 
> 
> 

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