METHOD AND DEVICE FOR CHANNEL ESTIMATION IN MOBILE COMMUNICATION SYSTEM

摘要

PURPOSE: A method and apparatus for channel estimation in a mobile communication system are provided to enhance the accuracy of channel estimation by additionally performing channel estimation in a time domain to eliminate the influence of ICI(Inter-Carrier Interference). CONSTITUTION: A CP(Cyclic Prefix) remover(110) eliminates a CP from a reference signal. A FFT(Fast Fourier Transformer)(120) performs the fast Fourier transformation of the reference signal from which the CP is removed. An LS(Least Square) channel estimator(230) measures a Doppler shift value. The LS channel estimator performs channel estimation for a frequency domain. An IDFT(Inverse Discrete Fourier Transformer)(140) outputs a channel impulse response through the inverse discrete Fourier transformation of a channel frequency domain. An adaptive filter(320) performs the channel estimation of a time domain by filtering the reference signal from which the CP is removed. A DFT(Discrete Fourier Transformer)(330) changes the outputs of the adaptive filter into the value of the frequency domain.