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

From: Bastian Bloessl
Subject: Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal
Date: Thu, 09 Oct 2014 11:26:29 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2

On 10/09/2014 10:40 AM, Ernest Szczepaniak wrote:

finnaly got it working :D Problem was with descrambler. Now it gives results
as follows:

                             Service: 'ok'
                           Duration: '0000'
          Source_MAC_Adress: '232323232323'
    Destination_MAC_Adress: 'FFFFFFFFFFFF'
                Protocol_version: 'Supported'
                                 Type: 'Data'
                            Subtype: 'Data'
                               To_DS: 'False'
                           From_DS: 'False'
                 More_fragments: 'No'
           Power_menagement: 'Active'
                         More_data: 'No'
                          Protected: 'No'
                                Order: 'Random'


But I still dunno how to estimate initial descrambler state (checked all and
found correct one this time).
Descrambler graph sould be the same as the scrambler from you paper right?
On the receiving side, take the first 7 bits, put them in the scrambler register, and use the very same algorithm on as on TX side. (Since the output of the scrambler is fed back the first seven bits are also the internal state of the scrambler).


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