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[Discuss-gnuradio] problem with ofdm link


From: BHN66
Subject: [Discuss-gnuradio] problem with ofdm link
Date: Tue, 9 Jun 2015 15:40:40 +0200

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?
 
 
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.
 
thanks in advance!
 
alphonso

Attachment: fig_0.png
Description: PNG image


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