Performance of channel estimation methods for OFDM systems in a multipath fading channels

In this paper, a Gaussian interpolation filter and cubic interpolation filt er are presented as more accurate interpolation filters compared to the con ventional linear interpolation filter. In addition to an interpolation filt er, a low pass filter using FFT and IFFT is also presented to reduce the no isy components of a channel estimate obtained by an interpolation filter. C hannel estimates after low-pass filtering combined with interpolation filte rs can lower the error floor compared to the use of only interpolation filt ers. Computer simulation demonstrates that the presented channel estimation methods exhibit an improved performance compared to the conventional linea r interpolation filter.