Re: [Discuss-gnuradio] problem with ofdm link

[Martin Braun]

On 09.06.2015 06:40, address@hidden wrote:
> hello,
> i have created a flowgraph (fig_0.png) for a simple ofdm link but it
> works only in parts. the first row (random_source -->
> gt_gui_constellation_sink) works perfect but the entire rest does not.
>  
> now two questions:
>  
> 1) stream_to_tagged_stream block: how looks this tagged stream? is there
> a header (is it called header?) in which i can find the key (pl) or a
> number (6) of the following bytes?
> pl,byte0, byte1,...,byte5 or 6,byte0,byte1,...,byte5?

Have a look at the manual page for 'tagged streams'. That should clear
things up.


> 2) when i simulate the entire graph i get the following error message:
>  
> using volk machine: sse3_64_orc
> floating point exception
>  
> any idea why? the my_qpsk_demod_cb block works perfect. it is from the
> guided tutorials 3+4 and tested.

No way to tell! Try creating a stack trace, or narrowing down which
block is triggering this.

Cheers,
Martin

>  
> thanks in advance!
>  
> alphonso
> 
> 
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