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

[Bastian Bloessl]

Hi,


On 07/17/2017 11:06 AM, Mériem Saïdi wrote:
> 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 
> flowgraph, or from the position of outputs i took to calculate BER ??!!
> any ideas please ?!

If you want to see errors, you have to change the SNR (lower it) or 
switch to higher modulation and coding schemes.

Apart from that, it is currently not out of the box possible to measure 
the BER, just the FER. An example simulation can be found in the 
simulations/awgn folder of the project. It produces this plot

https://github.com/bastibl/gr-ieee802-11/blob/next/simulations/awgn/pdr.pdf

Best,
Bastian