A novel approach for improving carrier frequency offset tracking performance of frequency domain channel equalizer employed in OFDM systems

Abstract

A new approach based on discrete wavelet transform (DWT) and Walsh Hadamard transform (WHT) for improving carrier frequency offset (CFO) tracking performance of the multi carrier communication systems has been proposed in this paper. The proposed DWT-WHT technique has been applied to frequency domain channel equalizer (FDE) employed in orthogonal frequency division multiplexing (OFDM) systems. Computer simulations have been performed to verify the performance of the proposed method in stationary and non-stationary frequency selective Rayleigh fading channels. The obtained simulation results using HIPERLAN/2 (IEEE 802.11a) physical layer specifications have demonstrated that the proposed DWT-WHT-OFDM method is outperforming the CFO tracking performances of conventional OFDM, WHT-OFDM and DWT-OFDM techniques, and is removing the error floor.