Patent ID: 7483368

Claim:
A method of detecting a carrier shift in a transmission system for transmitting an Orthogonal Frequency Division Multiplex (OFDM) transmission signal having a Transmission and Multiplexing Configuration Control (TMCC) carrier, said method comprising the steps of: a) demodulating the TMCC carrier from a received OFDM transmission signal to restore a TMCC carrier demodulated signal; b) detecting a relative carrier position of the TMCC carrier demodulated signal; and c) detecting a carrier shift amount based on the detected relative carrier position of the TMCC carrier demodulated signal, wherein said step b) includes the sub-steps of: b1) sampling the TMCC carrier demodulated signal in one symbol period in a predetermined layout pattern of the TMCC carrier, and adding the resulting samples, and b2) executing the sub-step b1) in each of positioning patterns shifted in increments of one carrier from the normal TMCC carrier position within a range of ± M carriers (M is an integer equal to or larger than two).