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參數(shù)資料
| 型號(hào)： | STV0196 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | QPSK/BPSK DEMODULATOR AND FEC IC |
| 中文描述： | 調(diào)制/ BPSK調(diào)制解調(diào)器和FEC集成電路 |
| 文件頁(yè)數(shù)： | 20/23頁(yè) |
| 文件大?。?/td> | 236K |
| 代理商： | STV0196 |
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A.2-ScalingandCorrectionversusPunctureRate
Scaling
This simple operation is recommended to easily
compare data which have been recorded under
different sensitivity conditions.To do so, theresult
S ofthe C/N indicationis multipliedby acoefficient
so that the scaled value would correspond to a
measure done with the highest counting period
(SN = 11).
Remark : Scaling is not donefor results which have
beenrecordedafterchangingtheAGCreferencelevel.
Scaling operation:Scaled_value= (S) x (factor)
factor= 64whenC/Nestimationis donewithSN= 00
factor= 16whenC/Nestimationis donewithSN= 01
factor= 4when C/NestimationisdonewithSN=10
factor= 1when C/NestimationisdonewithSN=11
Correction versus puncture rate
This correction is not required when a reference
look-up table have been memorizedfor each pos-
sible puncture rate. When required, the correction
is done with respect to the puncture rate PRref of
the referencelook-up table :
Scorrected
= (
S
)
PRcurrent
PRref
PR current : the puncture currently identified with
the bits0,1,2of VSTATUSregister.
A.3 - Comparing with the look-up table
In the application the read value Srs (scaled and
corrected)will seldom exactlymatch a value of the
look-up table; consequentlythere will be the need
for someinterpolation.
Tomakeitsimple,alinearinterpolationispreferred,
with such a solution a good precision can be
achievedwhenthe look-uptableisbuiltwithasmall
step for theC/N (or Eb/No).
Interpolation
Generally Ssr will be between two values of the
reference look-up table : V
(Min.)
≤
Ssr
≤
V
(Max.)
,
with V
(Min.)
corresponding
corresponding to C/N
(Min.)
(with typically
(C/N
(Max.)
) - (C/N
(Min.)
) = 0.5dB).
The calculated C/N correspondingto Ssr is :
C/N
(Max.)
and V
(Max.)
C
/
N
=
C/N
(
Max.
)
C/N
(
Max.
)
C/N
(
Min.
)
in above calculation C/N (or Eb/No) are given in
algebraic value (not indB).
V
(
Min.
)
Ssr
V
(
Min.
)
V
(
Max.
)
ANNEXE 1 :
C/n ESTIMATION(continued)
STV0196B
20/23
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| STV0196B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QPSK/BPSK DEMODULATOR AND FEC IC |
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