communication terminal is disclosed the channel estimation apparatus includes a moving average filter for calculating the average value of pilot signals an interpolator for computing a tentative estimation value of channel variation by using linear interpolation algorithms based on the average value of pilot signal a channel compensator for compensating a channel variable of the data signal delayed in a predetermined time based on the tentative estimation value of channel variation a decision block unit for tentatively determining data signal based on the compensated data signals a raw channel estimator for computing a raw channel estimation value based on the output signal of the decision block unit and the data signal delayed and a non linear filter for computing a final channel estimation value of channel variation based on the tentative estimation value of channel variation and the raw channel estimation value application_number US 73722303 A description other objects and aspects of the invention will become apparent from the following description of the embodiments with reference to the accompanying drawings which is set forth hereinafter 0025 fig3 is a diagram illustrating a transmitter of a wcdma forward system referring to fig3 a signal is transmitted to a receiver passing through a series.