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Interleaver

Interleaver. Saba Zia. Individual Properties of each Kernel Data Interleaver/ De-interleaver. Block size corresponding to the number of bits in a single OFDM symbol, NCBPS Two-step permutation i = (N CBPS /16) (k mod 16) + floor(k/16) where k = 0,1,…,N CBPS – 1

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Interleaver

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  1. Interleaver Saba Zia

  2. Individual Properties of each KernelData Interleaver/ De-interleaver • Block size corresponding to the number of bits in a single OFDM symbol, NCBPS • Two-step permutation • i = (NCBPS/16) (k mod 16) + floor(k/16) where k = 0,1,…,NCBPS – 1 • j = s × floor (i/ s) + (i + NCBPS – floor(16 × i/NCBPS)) mod s where i = 0,1,… NCBPS – 1 • The value of s is determined by the number of coded bits per subcarrier, NBPSC, according to s = max(NBPSC/2,1) 2

  3. Ncbps Ncbps Addrb_0 Addra_0 Change Ncbps Change Ncbps Addrb_1 Addra_1 clk Permuted data1_0 clk Permuted data1_0 Permute d data_2 Serial_in Permuted data1_1 Permuted data1_1 Start First Permutation Start Second Permutation addra addra douta douta addrb addrb clk clk dinb dinb Synthesis ResultsInterleaver

  4. Synthesis ResultsInterleaver

  5. Simulation Results Interleaver

  6. Simulation ResultsInterleaver

  7. Data Interleaver/ De-interleaver • First permutation • i = (NCBPS/16) (k mod 16) + floor(k/16) where k = 0,1,…,NCBPS – 1 • Right shift by 4 • Left Shift by 5 • Multiplier • Adder 7

  8. Data Interleaver/ De-interleaver • 2nd permutation • j = s × floor (i/ s) + (i + NCBPS – floor(16 × i/NCBPS)) mod s where i = 0,1,… NCBPS – 1 • Addition/Subtraction • Multiplication • Division 8

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