Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

On 10/05/2014 01:37 PM, Ernest Szczepaniak wrote:
> Greetings,
>
> Ok, got this. After some test's i think that the problem is with my
> descrambler (de-interleaver and Viterbi seems to be ok). Currently, im using
> Matlab's one provided by comm. toolbox.
>
> Is it correct to use 127-bit length pre-defined scrambling/descrambling seq?

No, this is an example output if you initialize the scrambler with
0b1111111.

> (i found it in 802.11 standard). Or it sould be only implemented as a shift
> register with poly 1+x4+x7?

yes.

>
> And last one question:
>
> In any of frames generated by your grc script, there sould be 16x"0" in
> SERVICE field (as it a part of PLCP Header)

yes.


> - becouse a typical wlan card is
> able to decode it, it is following the 802.11 standard - am I right?

No. It's following the standard and, thus, a normal card can decode it :-)

Best,
Bastian

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