Patent ID: 8050327

Claim:
A receiving system, comprising: a tuner configured to receive a broadcast signal comprising data groups, each data group including enhanced data and known data sequences, wherein at least two of the known data sequences are spaced 16 segments apart; a demodulator configured to demodulate the received broadcast signal; a channel equalizer configured to compensate channel distortions of the demodulated broadcast signal based on channel impulse responses (CIRs) estimated using at least two of the known data sequences, wherein at least one CIR for enhanced data placed between the known data sequences is obtained by interpolating at least two of the estimated CIRs, and wherein at least one CIR for enhanced data not placed between the known data sequences is obtained by extrapolating at least two of the estimated CIRs; a block decoder configured to decode the enhanced data in the channel distortion compensated broadcast signal; a Reed-Solomon (RS) frame decoder configured to correct errors in the enhanced data based on a number of errors estimated by performing Cyclic Redundancy Check (CRC) decoding on an RS frame and a reliability map representing reliability information of the enhanced data, wherein the RS frame comprises K number of packets having A bytes of enhanced data, RS parity data generated based on the K number of packets, and CRC checksum data generated based on the K number of packets having the RS parity data, wherein K>1 and A>1; and a derandomizer configured to derandomize the error-corrected enhanced data.