Kalman-filter method have been used for the estimation of time-frequency-selective fading

channels in OFDM systems, the estimation is based on Comb- type pilot frequencies

arrangement, the channel coefficients that belong to the pilot subcarriers are estimated.

Then these estimates are interpolated using different types of interpolations like; Low pass

interpolation, Spline cubic interpolation or Linear interpolation. The performances of all

schemes have been compared by finding Bit Error Rate where BPSK modulation scheme

was used.