Re: [Discuss-gnuradio] rx_ofdm example

[Shi Yang]

I read the page about schmidl&cox ofdm synch. block and now I know the 
frequency mod block is here to normalize the fine frequency offset. 
But why the sensitivity is -2/fft_len instead of 2/fft_len? Can 
somebody explain that to me?
And I still did not understand what are the delay and multiply block 
for.
While I was writing this email it hit me. The negative frequency 
offset is multiplied with the data stream for the fine frequency 
correction. Is that right? But why is the delay block necessary?
Best regards,
Yang
On Tue, 26 Sep 2017 14:01:29 +0200
 "Shi Yang" <address@hidden> wrote:
> Hi folks,
>
> I have a question about the rx_ofdm example. I have read the packet
> data transmission page on gnuradio.org
> (https://gnuradio.org/doc/doxygen/page_packet_data.html), but did 
> not
> find the answer I wanted. The schmidl&cod ofdm synch. block outputs 
> the
> frequency offset to a frequency modulation block. I did not get the
> purpose of frequency mod, delay and multiply blocks. what is the
> output after multiplying the signal delayed by one symbol length 
> with
> the frequency modulated offset? And when using this part in my own
> flow graph, how should I set the value of sensitivity?
>
> Thanks in advance and best regards,
> Yang
>
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