A Novel Adaptive OFDM Receiver with Second Order Polynomial Nyquist Window Function

This paper presents a new receive scheme applied to orthogonal frequency-division multiplexing (OFDM) systems for reducing inter-carrier interference (ICI) caused by frequency offset at the receiver. The proposed scheme uses a class of time domain second order polynomial Nyquist window on the receive side. The signal to interference plus noise ratio (SINR) and bit error ratio (BER) performances of the receiver are analyzed in this paper. We also propose a method to find the optimum window parameters to maximize the SINR of the receiver thus providing an adaptive receiving capability. The results show that the proposed method that enables the use of unity roll-off factor provides better SINR and BER than conventional receive methods whose roll-off factors are generally less than one. The new second order polynomial window is shown to provide better performance than raised cosine and "better than" Nyquist window.