Re: [Discuss-gnuradio] header_payload_demux

[xianda]

Hi<br/>     Thanks for your kindly reply.<br/>     1.The second question is:I 
see the fft block,it has one option:shift,and you set yes.<br/>     And in the 
transmit part,we should do the ifft.And in the receive part,we should do the 
fft.<br/>     They all set the shift:yes.<br/>     And now I want to save the 
data to file and analyse the data by matlab.<br/>     In the transmit maybe 
ifft(fftshift(symbol)),but in the receive what command?<br/>     2.I see maybe 
you don't use the pilot in the receive part.Am I right?<br/>     3.I see maybe 
the cyclic prefix is dropped in the header_payload_demux block.Am I right?<br/> 
    Thank you.Can you explain it?Thank you.<br/>Best regards
At 2014-05-30 05:05:54, "Martin Braun" <address@hidden> wrote:
>On 05/29/2014 08:07 PM, xianda wrote:
>> Hi:
>>       Thank you in advance.
>>       I have two simple question:
>>      1.In the grc,i see a block: header_payload_demux  
>>       It has 3 input:in,trigger,header_data.But i see
>> the header_payload_demux_impl.cc:iosignature::make2(1,2,..,..).But it
>> has 3 input,why?
>
>Why 3 inputs or how come only 2 are in the io signature?
>header_data is a message port, I guess that's what you're after.
>
>>      Thank you.
>>      2.fft:I see the shift:yes.
>>       I want to save the symbol to file sink and analyse by matlab.But
>> now i don't know it's shift earlier or fft earlier?
>
>Can you rephrase that question?
>
>M
>
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