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| The end of analog satellite broadcasting in 2011 will make available the 12-GHz-band BS channels for other advanced services. STRL is studying advanced digital satellite broadcasting with a large capacity transmission capability to enable these satellite channels to transmit Super Hi-Vision (SHV) broadcasting and a high-speed download service while fulfilling all the existing functions of current digital satellite broadcasting. |
- Using LDPC code*1 as the forward error correction code enables data transmission at nearly the theoretical limit. By reviewing the signal bandwidth, a capacity expansion of approximately 30% (transmission data approx. 70 Mbps/ch) can be attained without an annual service availability*2 decrease.
- The 16APSK*4 digital modulation scheme, in addition to conventional BPSK/QPSK/8PSK*3, can transmit a large amount of information.
- The transmission of a single stream using multiple satellite transponders can meet the demand for larger capacity data transmission.
- The ability to handle fixed length packets of MPEG-2 TS*5, along with variable-length packets, contributes to efficient transmission of large quantities of data.
- All the functions of current digital satellite broadcasting (hierarchical transmission, receiver activation signal for emergency warning system, etc.) are available.
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Our research on advanced satellite broadcasting systems will continue with the goal of making digital satellite broadcasting more convenient.
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*1 : Low Density Parity Check (LDPC).
*2 : Annual service availability: The annual time ratio of receivable signals without interruptions due to rain attenuation.
*3 : BPSK/QPSK/8PSK: Modulation schemes that change the phase of carriers in 2/4/8 patterns corresponding to the transmitted data.
*4 : 16APSK: A modulation scheme that changes the amplitude and phase of the carrier in 16 patterns for data transmission.
*5 : Transport Stream (TS).
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Advanced disital satellite broadcasting service image |
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