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Re: [Discuss-gnuradio] DPSK Modulator and Demodulator
From: |
marcin_w |
Subject: |
Re: [Discuss-gnuradio] DPSK Modulator and Demodulator |
Date: |
Wed, 21 Apr 2010 18:46:52 -0700 (PDT) |
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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