Silicon Motion FC8080 - Manual (Page 9)

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Product datasheet 9/52 Rev.0.95 2013-04-23
FC8080
Terrestrial Digital Multimedia Broadcast
RF tuner & Demodulator
1.5. Functional Description
1.5.1. Frame Synchronization and Mode Detection
Frame synchronization could get the start position of a frame and transmission mode by calculating
the energy range of the sampling data.
1.5.2. Automatic Gain Control (AGC)
AGC should preserve the amplitude of received signal to uniformity automatically.
It is affected to control the level of Viterbi soft decision signal.
1.5.3. Fast Fourier Transform (FFT)
FFF transform time signal of sub-carrier to frequency signal according to DMB transmission mode.
1.5.4. QPSK Demodulator
QPSK demodulator includes differential demodulation, QPSK de-mapping and frequency de-
interleaving function, etc.
1.5.5. Time de-interleaver / de-puncture
Time de-interleaver is capable of decoding 4 channels simultaneously. Also it can process
independent of channel size with adapting effective de-interleaving technique. It satisfies Eureka-
147 specification.
1.5.6. Viterbi Decoder/Inverse Energy Disposal Scrambler
Viterbi decoder should decode convolutional code that is adequate to mobile channel receiver.
It uses Maximum Likelihood Sequence Estimation. It is capable of decoding channel that is
RCPC code of 1/4 to 8/9 variable code rate.
1.5.7. Convolutional De-interleaver
The function of Convolutional De-Interleaver is to transform burst error to random error. It