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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA400A датащи(PDF) 52 Page - STMicroelectronics |
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STA400A датащи(HTML) 52 Page - STMicroelectronics |
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52 / 117 page  STA400A 52/117 attenuation function: ; α(k + 1) = α(k) +b k0 = channel window length (in Symbol Rate), a = attenuation factor (in dB) and b= corr_weight_factor / 2 13 Constant Channel Window (Ko=180 samples): Constant Attenuation (3dB): HistLen_M - History Register Length Stores the last 15 shift operations of the window start position. The chosen value will restrict the array out of which the minimum shift operation will be searched. b3-b0 : 0000=Current correlation maximum will be proceeded . 1111=Current and the last 15 correlation positions will be taken account CN_M - Estimated Noise ans Signal to Noise Power Uses 12 adjacent carriers besides the active carriers. Estimates power within these 24 adjacent carriers (mff_n_guard) and power within all 637 active carriers (mff_cpn_act). b23-b12 : mff_n_guard b11-b0 : mff_cpn_act Attenuation b (*213) 0dB 8192 3dB 8184 6dB 8176 12dB 8160 Channel Window b(*213) 180 8184 90 8176 45 8160 Type: SingleByte - R/W Word Length: 4 Byte Name Address (Hex) Bit Map Reset Value (Hex) HistLen_M 0117 3-0 0F Type: MultiBytes - R Word Length: 24 Byte Name Address (Hex) Bit Map Reset Value (Hex) CN3_M 011B 23-16 -- CN2_M 011A 15-8 -- CN1_M 0119 7-0 -- α k () 10 k 2k 0 --------- a 20dB -------------- ⋅ = b10 k 2k 0 --------- a 20d B -------------- ⋅ = |
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