STV0196 datasheet(21/23 Pages) STMICROELECTRONICS

部件名	STV0196

功能描述	QPSK/BPSK DEMODULATOR AND FEC IC

PDF	23 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

21 / 23 page

Normal Process

C/N

Estimation

Check

VSTATUS

SN < ----- 00

Collect C/N data 100 times

and calculate average value

S< 60

SN = 11

S< 40

m < ----- m - 4

Collect C/N data 100 times

and calculate average value

S< 20

m < ----- m - 4

Collect C/N data 100 times

and calculate average value

Compare with look-up table T3

Compare with look-up table T2

Compare with look-up table T1

Output C/N estimation

SN < ----- SN + 1

Scaling S

Correction versus

Puncture Rate

Go to Tuning Routine

End of

Estimation

Restore AGC Reference

Level to normal value

Return to normal process

T1 : Look-up table for normal value of m (AGC reference level)

T2 : Look-up table for m - 4

T3 : Look-up table for m - 8

B - FLOW CHART

Following is a simplified flow chart.

ANNEXE 1 : C/n ESTIMATION (continued)

STV0196B

21/23

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