UPLINK RECEIVING DEVICE OF AN OFDMA SYSTEM BASED ON LTE CAPABLE OF DRASTICALLY REDUCING THE SIZE OF AN UPLINK RECEIVING DEVICE AND A FREQUENCY SYNCHRONIZING METHOD THEREOF

摘要

PURPOSE: An uplink receiving device of an OFDMA system based on LTE and a frequency synchronizing method thereof are provided to extract a signal through an FFT(Fast Fourier Transform) performing unit, a sub-carrier extracting unit, and an inverse DFT(Discrete Fourier Transform) performing unit, thereby drastically reducing a hardware capacity necessary for extracting a signal.;CONSTITUTION: An FFT performing unit(210) demodulates an OFDM signal by performing FFT. A sub-carrier extracting unit(220) selectively extracts only an OFDM signal of a corresponding terminal from output signals of the FFT performing unit. An inverse DFT performing unit(230) converts a signal of a frequency domain into a signal of a time domain. A frequency offset estimating unit(240) estimates a frequency offset of a specific terminal by the correlation between an output signal of the inverse DFT performing unit and an input signal of the inverse DFT performing unit. A loop filter(250) bypasses a frequency offset to an offset compensating unit(260). The offset compensating unit compensates for a frequency offset of an OFDM uplink signal.;COPYRIGHT KIPO 2012