Performance analysis of pilot assisted channel estimation in OFDM

Abstract

Orthogonal frequency division multiplexing is one of the most successful multicarrier modulation techniques. This modulation technique is now used in many areas because of its intelligent bandwidth utilization and fast transmission. Channel estimation in OFDM is crucial for elimination of the distortions introduced by the channel. There are many parameters like fading, reflection, refraction and diffraction which affect the transmitted signal. This paper comprises of the performance analysis of pilot arrangement techniques which are Block type and comb type. The parameters over which the performance is evaluated are Symbol error rate (SER) and Mean squared error (MSE). At low and high SNR behavior of LS and MMSE has been evaluated over AWGN channel for BPSK modulation. Comb type MMSE performs well in comparison with LS but have higher complexity too in case of MSE but for SER Lowpass interpolation performs best with MMSE.