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Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal
From: |
Ernest Szczepaniak |
Subject: |
Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal |
Date: |
Mon, 6 Oct 2014 01:33:07 -0700 (MST) |
Hi, much appreciate for your reply Bastian.
I have succefully found your frame.bin signal, forwarded by my USRP
(generated in MATLAB, received with Windows Network Monitor and wlan card).
You were right. It is Data frame, 232323:232323 Source MAC and FFFFFF:FFFFFF
Destination MAC.
Still dunno what's wrong.
Could you please check my methodology??
1st OFDM symbol is carrying a SIGNAL field - it is decoded correctly (i
checked all rates with your grc wlan script) - no problem here.
2nd OFDM symbol is carrying Data. Assuming BPSK 1/2, it should carry 16 bit
SERVICE field, and 8 bits from FRAME CONTROL field (together - 24 uncoded
bits).
And my algorythm goes as follows (for 2nd OFDM symbol):
- OFDM demodulation (to get 48 complex data points)
- BPSK demodulation (to get 48 coded bits)
- de-interleaving (1st and 2nd permutation)
- Viterbi decoding ([133 171 poly] to get 24 uncoded bits)
- descrambling
and if its correct way, i should get 24 bits of data (16x0 and 8 bits
depending on FRAME CONTROL paylaod) right?
Best,
Ernest
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Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/05
Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal,
Ernest Szczepaniak <=
Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/06
Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/07
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Bastian Bloessl, 2014/10/08
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/08
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Bastian Bloessl, 2014/10/08
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Bastian Bloessl, 2014/10/08
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/08
- Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal, Ernest Szczepaniak, 2014/10/08