Abstract: A method of determining a training signal so as to facilitate acquisition of symbol sync, frequency offset estimation, and channel estimation in an orthogonal frequency division multiplexing (OFDM) system, and an apparatus and method for receiving a baseband OFDM signal using the training signal are provided.

Abstract: A method of determining a training signal so as to facilitate acquisition of symbol sync, frequency offset estimation, and channel estimation in an orthogonal frequency division multiplexing (OFDM) system, and an apparatus and method for receiving a baseband OFDM signal using the training signal are provided.

Abstract: A carrier recovery apparatus includes a loop filter that converges quickly and corrects a large frequency error. The carrier recovery apparatus includes a multiplier, a matched filter, a phase error detector, a loop filter and a numerically controlled oscillator (NCO). A bandwidth varying circuit varies the bandwidth of the loop filter according to whether the signal output from the matched filter is phase-locked. A frequency error detector detects a frequency error from the output of the matched filter. An adder adds each level of an input sweep signal and the output of the loop filter, and supplies the added results to the NCO. A switch selectively supplies the output of the loop filter to the adder. A controller generates a sweep signal having a plurality of levels and controls turning the switch on and off.