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參數(shù)資料
| 型號： | STA400A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | XMRADIO SDARS CHANNEL DECODER |
| 中文描述： | XMRADIO衛(wèi)星數(shù)字收音機信道解碼器 |
| 文件頁數(shù)： | 21/117頁 |
| 文件大?。?/td> | 910K |
| 代理商： | STA400A |
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STA400A
C/N Estimator
This block gives the signal to noise ratio at the Nyquist filter output. It computes the statistic (mean and variance)
of a single component of the demodulated complex signal and writes the estimated C/N value in dB in the CN
register.
This register has a fixed point format. The integer part of the number is stored in the six MSBs (bit7-2) and the
fractional part in the two LSBs (bit1-0). The C/N estimation is correct only when the QPSK demodulator is
locked.
Carrier Null Offset
This block is used to enhance the acquisition performance of the carrier loop. It may be enabled/disabled setting
bit-6 of the QPSK_CTRL register. The block consists of a FSM that is activated when the carrier loop has
reached the lock condition (low level on at the Lock Detector output). The FSM checks if the lock detector output
is low for a programmable period (see NULOFS_WIN register) and then it writes the locked carrier frequency
value (read from the CARFREQ register) into the Carrier NCO. It resets also the carrier loop filter integrator and
disables the frequency sweep (see fig.6).
In this way the demodulator works with a null carrier offset resulting in a faster re-acquisition time of the carrier
in case of a signal drop-out. The NULOFS_DELTAF register gives the possibility to subtract a programmed fre-
quency from the locked carrier before writing the new value in the carrier NCO.
The flow diagram of the CarrierNullOffset FSM is showed in fig.13
Flag Register
A flag register is provided in the QPSK demodulator. This is a read only register containing specific status bits
of the demodulator. It gives information on the lock staus and on the operation of the CarrierNullOffset and Ti-
mintgCtrl blocks.
Figure 13. CarrierNullOffset FSM Flow Diagram
demodulator locked (LOCK=0)
demodulator
unlocked
system reset
or
block disable
demodulator locked for
value (NULOFS_WIN)
demodulator locked for a time equal to the
fixed value (NULOFS_WIN)
no system reset
Reading lock
Reading lock
Time counter active
Frequency.Sweep Disabled
Carrier Loop Filte Integrator Cleared
Writing New IF Frequency in the Carrier NCO:
NEW_IF_FREQ= CARFREQ-NULOFS_DELTAF
Clear release in the carrier loop
filter integrator
system reset
or
block disable (NULOFS_EN=0)
or
demodulator unlocked (LOCK=1)
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