METHOD FOR ESTIMATING FREQUENCY OFFSET IN UWB-OFDM SYSTEM WITH CYCLIC DELAY DIVERSITY AND APPARATUS THEREOF

摘要

PURPOSE: A frequency error estimation method in a UWB-OFDM[UltraWide Band-Orthogonal Frequency Division Multiplexing]system and an apparatus thereof, capable of employing a cyclic delay diversity technique are provided to estimate a correct frequency error. CONSTITUTION: A transmission end(100) transmits symbols to each transmission antenna using a cyclic delay diversity technique when the cycle of the same OFDM symbol is delayed in a time axis. A receiving end(200) includes a Fourier transforming unit(210), a sub-band selector(220), a self signal correlation unit(230), a RFO[Residual Frequency Offset](240), and a SFO[Sampling Frequency Offset](250). The Fourier transforming unit transforms OFDM symbols transmitted from the transmission end in a Fourier transforming way at a high speed. The sub-band selector senses all channel powers in distinguishable sub-bands and estimates or selects a sub-band which has a maximum channel power. The self signal correlation unit produces a self correlation value about a pilot symbol in the corresponding OFDM symbol transmitted through the selected sub-band. The RFO estimator and the SFO estimator estimate the error of a residual frequency or the error of a sampling frequency by using the produced self correlation value. [Reference numerals] (100) Transmission end; (110) Cycle delay selector; (200) Receiving end; (210) Fourier transforming unit; (220) Sub-band selector; (230) Self signal correlation unit; (240) RFO estimator; (250) SFO estimator