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

On 10/08/2014 11:54 AM, Ernest Szczepaniak wrote:
> Ok. After couple of days trying to decode your frame i decided to check my
> receiver with real samples.
> Could it be possible that after demodulation (de-interleaving,
> de-convolutional, de-scrambling) im getting over 40x0's in correct positions
> (9 reserved bits, 16x0s in duration, correct pads) and still cant work out
> your frames? Such amount of correct data couldnt be a coincidence :(
>

As I already mentioned, it is very hard to help you without the code...

> That test frame from Annex L is fully coded (scrambled, interleaved and conv
> coded)?


Yes, it is. And it's clearly stated. But for your convenience I can copy
paste from the standard.

The encoding illustration goes through the following stages:
a) Generating the short training sequence section of the preamble;
b) Generating the long preamble sequence section of the preamble;
c) Generating the SIGNAL field bits;
d) Coding and interleaving the SIGNAL field bits;
e) Mapping the SIGNAL field into frequency domain;
f) Pilot insertion;
g) Transforming into time domain;
h) Delineating the data octet stream into a bit stream;
i) Prepending the SERVICE field and adding the pad bits, thus forming
the DATA;
j) Scrambling and zeroing the tail bits;
k) Encoding the DATA with a convolutional encoder and puncturing;
l) Mapping into complex 16-QAM symbols;
m) Pilot insertion;
n) Transforming from frequency to time and adding a circular prefix;
o) Concatenating the OFDM symbols into a single, time-domain signal.

Bastian

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