A Novel Approach for Diminution of Inter-symbol Interference using Pilot Based Channel Estimation for OFDM in Wireless communication System

Over the past two decades, the rapid development of wireless communication technology has brought great convenience to people's lives and work. Orthogonal frequency division multiplexing (OFDM) is a modulation technique which is now used in most new and emerging broadband wired and wireless communication systems because it is an effective solution to inter-symbol interference caused by a dispersive channel. In this paper, pilot-based channel estimation of OFDM system is discussed in detail. Focus has been placed on comb type pilot arrangement scheme with two different ways of pilot placement for reducing the inter-symbol interference (ISI). The simulation results show that the performance becomes better as the increasing order of polynomial for interpolation. It is shown that low pass interpolation perform better than other three interpolation techniques.