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Table 4 Static analysis of DSP resource utilization

From: Design and implementation of an OFDMA-TDD physical layer for WiMAX applications

Task DSP cycles per frame ZBTRAM memory DSP memory Estimated time (μ s)
BS+MS: PHY control (FEC)   3,000 K BS 0 K BS 77.11
   5,500 K MS 0 K MS  
Repetition coding Rep 2: 56 ×nslots    0
  Rep 4: 83 ×nslots    
  Rep 6: 134 ×nslots    
FEC data preprocessing 7 + nbunc × 2/4    BS 48.67
     MS 28.42
FEC data postprocessing 9 + nbunc × 2/4    BS 28.44
     MS 48.69
BS: TX PUSC DL   2,000 K 618 K 168.00
Frame initialization 6 + n fft + (3 + N fft /4) × nsymb    12.08
Add burst to frame 147 × nsubc × nsymb/2    88.20
Subcarrier randomization (11 + nused × 2) × nsymb    67.72
BS: RX PUSC UL   2,000 K 327 K 463.97
Subcarrier randomization 8,501 + (11 + Nused × 2) × nsymb    64.96
Extract burst from frame (equalization included) 6 + nslots × 1,140    399.01
BS: RX ranging 36,059 × nsubc/6 × nsrang/3 500 K 0 K 112.68
Energy threshold 82 × nsubc/6 × nsrang/3    0.26
Extract ranging code 21,504 × nsubc/6 × nsrang/3    67.20
Extract pilots 144 × nsubc/6 × nsrang/3    0.45
Frequency offset 14,329 × nsubc/6 × nsrang/3    44.78
MS: RX PUSC DL   1,000 K 564 K 582.84
Subcarrier randomization (11 + nused × 2) × nsymb    67.72
Equalization 425 × nsubc × nsymb    510
Extract burst from frame (16 + nsubc × 8) × nsymb/2    5.12
MS: TX PUSC UL   1,000 K 196 K 131.14
Frame initialization 14 + nslots × 7    2.47
Add burst to frame 6 + nslots × 182    63.71
Subcarrier randomization 8,501 + (11 + Nused × 2) × nsymb    64.96