Abstract: The purpose of this paper is to design the Interpolator for WLAN 802.11n applications. The design of interpolator is based on Low Pass FIR filter. FIR filter show linear and stable performance if compare to the IIR filter. Equiripple technique and Kaiser Window are used here for the design simulation purpose which is done by using Matlab. The performance has been compared in the terms of stop band ripples, RMS EVM and PSD. It is concluded from the simulation results that Kaiser Window show better results when less transition width is required and Equiripple technique gives reduced amount of stop band ripples. The result also shows that performance of all the designs can be changed when filter order is increased.
Keywords: Equiripple technique, IEEE802.11n, Interpolator, Kaiser Window, Low Pass Filter, MATLAB, MIMO, OFDM.