Patent ID: 7826524

Claim:
A method of processing a broadcast signal in a receiving system, the method comprising: overlapping a group of data packets in the broadcast signal, wherein the group of data packets includes first, second and third data regions, the second data region being located between the first and third data regions, and the second data region having enhanced data and a plurality of regularly spaced known data sequences, each of the first and third data regions having main data and enhanced data, wherein the broadcast signal includes MPEG header data, trellis initialization data and Reed-Solomon (RS) parity data; estimating channel impulse responses (CIRs) of the known data sequences in the second data region according to a first algorithm; estimating CIRs of the enhanced data in the second data region by interpolating the estimated CIRs of the known data sequences; calculating equalization coefficients based on the estimated CIRs of the known data sequences and the enhanced data in the second data region; compensating channel distortion of the overlapped data by multiplying with the equalization coefficients; and saving the compensated data.