STA002
STA002 is STARMANO CHANNEL DECODER manufactured by STMicroelectronics.
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STARMAN™ CHANNEL DECODER
FRONT_END INTERFACE: IF input carrier frequency: f = 1.84 MHz Single internal 6 bit A/D converter QPSK demodulation Input symbol frequency: Fs = 1.84 Msymbols/s Digital Nyquist root filter:
- roll-off value of 0.4 Digital carrier loop:
- on-chip quadrature demodulator and tracking loop
- lock detector
- C/N indicator Digital timing recovery:
- internal timing error evaluation, filter and correction Digital AGC:
- internal signal power estimation and filter
- output control signal for AGC (1 bit PWM) FORWARD ERROR CORRECTION: Inner decoder:
- Viterbi soft decoder for convolutional codes, constraint length M=7, Rate 1/2 Deinterleaver block Outer decoder:
- Reed-Solomon decoder for 32 parity bytes; correction of up to 16 byte errors
- Block lengths: 255
- Energy dispersal descrambler BACK_END INTERFACE: Broadcast Channel selection Audio Service ponent selection to MPEG decoder Service ponent selection CONTROL: I2C serial Bus control interface
TQFP44
DECRYPTION: WES scheme supported DESCRIPTION Designed for World Space satellites digital audio receivers, the STA002 Digital Receiver Front-end integrates all the blocks needed to demodulate ining digital satellite audio signals from the tuner: analog to digital converter, QPSK demodulator, signal power estimator, automatic gain control, Viterbi decoder, deinterleaver, Reed-Solomon decoder and energy dispersal descrabler. Its advanced error correction functions guarantees a low error rate even with small low gain receiver antennas. Additional functions include the selection of broadcast channel, service ponents and audio ponents for source decoding:
- The MPEG Audio bitstream is provided at the serial audio output port.
- The Broadcast Channel is provided to the serial data output port.
- The Service ponent is provided at the SC output interface. World Space encryption scheme is supported for pay programs and paging.
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January 2002 1/43
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