matlab code for channel estimation in ofdmsytem using UKF

Abstract

Orthogonal Frequency Division Multiplexing is a multicarrier scheme where the individual carriers are orthogonal to each other.OFDM combats inter-symbol interference effectively. The frequency offsets in mobile radio channels
distort the orthogonality between subcarriers resulting in Inter Carrier Interference (ICI). ICI causes power leakage among subcarriers thus degrading the system performance. The problem in OFDM is its sensitivity to frequency offset between transmitted and received carrier frequecies. The two effects of frequency offset are the reduction of signal amplitude in the output of the filters matched to each of the carriers and the second is introduction of ICI from the other carriers. We compare two methods to combat ICI : ICI Self Cancellation (SC) and Extended
Kalman Filter (EKF) method.These methods are compared in terms of bit error rate and bandwidth efficiency. EKF
method performs better than SC method this will be shown by simulations.