Patent ID: 7876835

Claim:
A method of processing a broadcast signal in a DTV receiving system, the method comprising: receiving in a receiver the broadcast signal including a data group having first segments, second segments and third segments, the second segments being positioned between the first and third segments, the first segments having mobile data and main data, the second segments having mobile data and known data sequences and the third segments having mobile data and main data, wherein the mobile data in the first, second and third segments are encoded by RS-CRC (Reed Solomon-cyclic redundancy check) encoding and non-systematic RS encoding, the main data in the first and third segments are encoded by systematic RS encoding and at least two of the known data sequences have different patterns; converting the mobile data of the broadcast signal into frequency domain data; estimating channel impulse responses during intervals in which first and second known data sequences located before and after each mobile data block in the broadcast signal are received; calculating an average value of the estimated channel impulse responses; converting the average value of the estimated channel impulse responses into frequency domain data; calculating equalization coefficients using the average value of the estimated channel impulse responses in the frequency domain; compensating channel distortion of each mobile data block in the frequency domain by multiplying each mobile data block with the equalization coefficients; and converting the compensated mobile data block into time domain data.