Patent ID: 8208499
Filing Date: 2012-06-26
Classification: H04L

Abstract:
1. A method performed by a transmitter for supporting frame synchronization in a digital communication system, the method comprising the steps of: mapping a codeword specifying framing information of a frame according to a signal constellation to output a data stream of symbols, wherein the frame is a Low Density Parity Check (LDPC) coded frame; duplicating and demultiplexing each of the symbols into a first data stream of duplicate symbols and a second data stream of symbols; modifying the first data stream of duplicate symbols according to a predetermined operation to generate modified first data stream of duplicate symbols, wherein the predetermined operation includes multiplying the first stream of duplicate symbols with {−a} or {a}, a being a predetermined constant and the sign of the multiplier represents a portion of the framing information; multiplexing the modified first data stream of duplicate symbols with the second data stream of symbols to interleave the second data stream of symbols with the modified first data stream of duplicate symbols and generate a frame synchronization structure; and outputting a physical layer signaling header including the frame synchronization structure for the frame based on the multiplexed and modified first data stream of duplicate symbols and second data stream of symbols for transmission in the digital communication system.