Patent ID: 7933347

Claim:
A receiver for compensating for a frequency offset of a received signal in a multiband Orthogonal Frequency Division Multiplexing (OFDM) scheme, the receiver comprising: a numerically controlled oscillator (NCO) which generates a first compensation signal by processing an input signal in a time domain based on a first carrier frequency offset estimated in the time domain, and a second carrier frequency offset estimated in a frequency domain; a sampling frequency offset tracking (SFOT) unit which generates a second compensation signal by estimating a sampling frequency offset from frequency domain pilot symbols which are contained in the first compensation signal; a carrier frequency offset tracking (CFOT) unit which estimates the second carrier frequency offset by using pilot symbols which are contained in the second compensation signal; an analog-to-digital converter (ADC) which samples a received radio frequency (RF) signal, and converts the sampled RF signal into a digital signal; a switch which converts the digital signal from serial form into parallel form according to a position value; a packet detection unit which provides the position value; and a cover sequence unit which generates the input signal by unmasking a preamble from the digital signal converted into the parallel form according to a Time Frequency Code (TFC).