Re: [Discuss-gnuradio] Constant size OFDM frame synchronizaton

[Martin Braun]

Oscar,

if your frame size is constant, you may not need the header/payload
demux. However, there's the rx_ofdm.grc example you can use to see how
to connect it all together.

Cheers,
M

On 07/12/2016 12:53 AM, Oscar Sánchez wrote:
> Dear all,
> 
> I'm building an OFDM tx/rx with constant OFDM frame size. So far, no
> header is required. Thus, each OFDM frame is composed of 2 OFDM symbols
> for synchronization and N (constant) OFDM symbols for data.
> 
> I want to use Schmidl & Cox synch.
> 
> I require to generate, after Schmidl & Cox detect pulse, a stream of
> (2+N)*M tagged complex numbers (M = OFDM symbol size) to perform channel
> estimation and frame equalization.
> 
> As in the example rx_ofdm, I was trying to use "Header/Payload Demux".
> My idea was to use a block that generates a message for the
> Header/Payload Demux message port when a detect pulse from Schmidl & Cox
> is received. However, I didn't find any message generator module that
> can be triggered with a signal.
> 
> Another solution I though of was to use a module that puts a tag in a
> stream when a trigger signal is received.
> 
> Is my approach correct? Is there any gnuradio block I can use to solve
> my problem?
> 
> Best regards,
> 
> Oscar
> 
> 
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