Method and apparatus for synchronizing a multi-level modulation signal
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United States of America Patent
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Mar 15, 2011
Grant Date -
Feb 8, 2007
app pub date -
Apr 30, 2004
filing date -
May 5, 2003
priority date (Note) -
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Abstract
A satellite communications system comprises a transmitter, a satellite transponder and a receiver. The transmitter transmits an uplink multi-level modulated signal (hierarchical modulation, layered modulation, etc.) to the satellite transponder, which broadcasts the multi-level modulated signal downlink to one, or more, receivers. The multi-level modulated signal comprises an upper layer and a lower layer. The lower layer conveys LDPC blocks, or LDPC frames, each LDPC block comprising S bits of data including a header portion and a data-bearing portion. The upper layer conveys shorter blocks, each shorter block comprising R bits of data, where R
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