APPARATUS OF CHANNEL ESTIMATION FOR OFDM RECEIVER, AN OFDM RECEIVER HAVING THE SAME AND A METHOD OF CHANNEL ESTIMATION FOR AN OFDM RECEIVER, CAPABLE OF IMPLEMENTING EFFECTIVE CHANNEL ESTIMATION BY CHANGING CHANNEL ESTIMATION ALGORITHM ACCORDING TO CHANNEL CONDITION

摘要

PURPOSE: An apparatus of channel estimation for an ofdm receiver, an ofdm receiver having the same and a method of channel estimation for the ofdm receiver are provided to selectively apply a channel estimation method according to the channel condition using output signal of an automatic gain control apparatus.;CONSTITUTION: A timing synchronization part(110) implements the OFDM symbol synchronization of a received baseband signal. A time domain average unit(120) offers the average value of OFDM symbols as the average signal in the time domain. A Fourier transformer(130) performs Fourier transformation of the average signal. A first comparison unit(140) offers a first smoothing signal deciding the smoothing state of the channel estimation result. A guard band power calculation part(150) calculates the power of the guard band. A second comparison unit(160) offers a second smoothing signal deciding the smoothing state of the channel estimation result. A smoothing application part(170) offers the channel estimation result.;COPYRIGHT KIPO 2010