Patent ID: 8437436

Claim:
An apparatus for estimating a channel in a wireless communication system, the apparatus comprising: a storage unit configured to store coefficient sets for each of a plurality of channel estimation types; a controller configured to select one of the plurality of channel estimation types according to at least one of a type of a pilot signal and a reliability value of a channel parameter; and an N-tap filter configured to determine channel estimation values of data tones by using the coefficient sets for the selected channel estimation type, wherein the plurality of channel estimation types comprise at least two of: a first type comprising a Wiener type which uses coefficients determined by using Doppler frequency, delay spreading, and noise power, a second type comprising time-axis linear interpolation, time-axis Infinite Impulse Response (IIR) filtering, frequency-axis linear interpolation, and frequency-axis Finite Impulse Response (FIR) filtering, and a third type comprising the time-axis linear interpolation and the frequency-axis linear interpolation.