An efficient correction of carrier frequency offset and sample timing offset by feedback method

Orthogonal frequency division multiplexing (OFDM) is effective method for transmitting high speed data at frequency selective channel. But OFDM is sensitive to the carrier frequency offset (CFO) and sample timing offset (STO). As these effects, inter-carrier interference (ICI), inter-symbol interference (ISI) and common phase noise error (CPE) occur. And these effects cause degradation of performance. In this paper, we estimate STO and CFO by using block type pilot and then send estimated data to time domain for compensation. Especially, STO is considered as integer and fractional type STO. Each type of STO is analyzed and compensated. And we confirm system performance through simulation. As a result of simulation, we ensure that STO and CFO can be compensated without equalizer through feedback.