CARRIER FREQUENCY RECOVERY DEVICE FOR IMPROVING CARRIER FREQUENCY OFFSET CORRECTION RANGE BY USING GUARD INTERVAL AND SYNCHRONOUS SIGNAL IN TDS-OFDM SYSTEM AND RECOVERING METHOD THEREOF

摘要

PURPOSE: A carrier frequency recovery device using a guard interval and a synchronous signal in TDS-OFDM system and a recovering method thereof are provided to recover a carrier frequency by measuring a relative phase rotation difference of continuous synchronous segment signals. CONSTITUTION: A carrier frequency recovery device includes a first block for recovering a carrier frequency by using a guard interval, a second block for recovering the carrier frequency by using a synchronous segment, and an adder. The first block includes a first delay unit(305) for calculating a first delay signal, a first conjugate complex number unit(310) for calculating a conjugate complex number of a guard interval of the delay signal, a first multiplier(315) for multiplying the conjugate complex number by a received OFDM signal, and a first correlator(320) for calculating a correlation value between the received OFDM signal and the first delay signal by the convolution of the output from the first multiplier, and a first phase estimator(335) for estimating a variation of phases.