Under present circumstances, where an increasing number of wireless
communication systems employ the QAM method as a modulation method for
frequency use efficiency enhancement as the speed of information
transmission in the wireless communication systems increases, it is an
object of the present invention to provide a channel estimation method
for estimating a channel efficiently and accurately and establishing
communication at high quality, that is, providing communication with
excellent error rate characteristics. To achieve the above object, the
present invention improves characteristics by calculating the channel
estimation results variously for all data signal symbols and using them
for demodulation. To accomplish the object, the present invention also
pays attention to the frequency characteristics of fading in a radio
propagation path and enhances the accuracy in channel estimation result
calculation by using a band pass filter for eliminating the thermal noise
that would increase the estimation error.