[Discuss-gnuradio] Calculate BER in WIFI 802.11p standards

[Meriem]

Hi,

I use 802.11 IEEE standards to code and decode a PMT message and i would
like to calculate the BER between the source of information I want to encode
and the same source after decoding. (see attached screen-shots below)
Except that I have all time a null BER ! however the "channel model" block
introduce noise so the BER can't be null!
I've tried with a Random Source instead of Message Strobe but always the
same result !
I don't know if the problem comes from one of the encoding/decoding
flow-graph, or from the position of outputs i took to calculate BER ??!!
any ideas please ?!

Cheers,
Meriem.
<http://gnuradio.4.n7.nabble.com/file/n64525/encoding.png> 
<http://gnuradio.4.n7.nabble.com/file/n64525/decoding.png> 
<http://gnuradio.4.n7.nabble.com/file/n64525/wifi_phy_hier.png> 
<http://gnuradio.4.n7.nabble.com/file/n64525/BER.png> 
<http://gnuradio.4.n7.nabble.com/file/n64525/result.png> 



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