STA400A datasheet(52/117 Pages) STMICROELECTRONICS

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STA400A

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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

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

8176

8160

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

HistLen_M

0117

3-0

Type:

MultiBytes - R

Word Length:

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

()

---------

20dB

--------------

⋅

b10

---------

20d B

--------------

⋅

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