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802.11g Kernel Identification

802.11g Kernel Identification. Saba Zia Bilal Saqib 3 rd September, 2008. Barker Code Despreading - Kernel Identification. Received chip sequence for data bit ‘1’ and ‘0’ 10110111000 01001000111 In bipolar format 1-111-1111-1-1-1 -11-1-11-1-1-1111

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802.11g Kernel Identification

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  1. 802.11g Kernel Identification Saba Zia BilalSaqib 3rd September, 2008

  2. Barker Code Despreading - Kernel Identification • Received chip sequence for data bit ‘1’ and ‘0’ • 10110111000 01001000111 • In bipolar format • 1-111-1111-1-1-1 -11-1-11-1-1-1111 • Correlation with Barker sequence determines actual data bit

  3. Correlation at Receiver

  4. CCK Decoding Process - Kernel Identification 8 chip code 8 chip code correlation By FWB Find Largest Modulus by Comparators Data bits estimated Decode Phase 2 bits estimated

  5. Demodulation Fast Walsh Block Specifications

  6. Fast Walsh Transform • ------ represents -1 • ____ represents 1 • -.-.-.- represents j • ……..represents -j

  7. Maximum Power Selection Extract Magnitude of each branch by CORDIC Compare the magnitudes Highest magnitude branch correspond to the code word index Index is used to decode the data with the help of LUT

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