A Carrier Frequency Offset and Timing Offset Detection Scheme of OFDM Systems Utilizing Pilot Sub-Carriers

摘要

A novel carrier frequency offset and timing off- set detection scheme for orthogonal frequency division multiplex- ing (OFDM) is proposed. The carrier frequency offset is detected by utilizing a certain a-priori known pattern of power differences along the sub-carrier index. The power difference is caused by the collapse of the orthogonal condition. In order that the power differences are effectively influenced by the frequency offset, time- domain windowing is employed. Timing offset is detected by uti- lizing average phase rotation according to the sub-carrier index.