Method and apparatus for providing signal acquisition and...

Details Method and apparatus for providing signal acquisition and... Method and apparatus for providing signal acquisition and...

H - Electricity

04

L

H04L 27/18 (2006.01) H04H 20/74 (2009.01) H03M 13/33 (2006.01)

Patent

CA 2470795

An approach is provided for supporting signal acquisition and frame synchronization in a digital broadcast system utilizing Low Density Parity Check (LDPC) codes. Hierarchical modulation is utilized to provide backward compatibility, whereby the lower layer signal is encoded using LDPC coding. A signal is received, whereby the signal is modulated according to the hierarchical modulation scheme including an upper layer and a lower layer. The signal includes a data pattern and a coded frame. The dependency of the received signal on the upper layer modulation is removed. The modulation removed signal is correlated with multiple predetermined data patterns to determine the data pattern of the signal. The code rate of the coded frame is derived based on the determined data pattern. The above arrangement is particularly suited to a digital satellite broadcast system.

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