Analysis of carrier frequency offset in WFRFT-OFDM systems using MLE

摘要

Traditional Orthogonal Frequency Division Multiplexing (OFDM) system is a multi carrier transmission technique that splits data stream into a number of data subcarriers in parallel. In this method, a 4-Weighted Fractional Fourier Transform (4-WFRFT) is proposed for modulation / demodulation of the subcarriers. The method uses Maximum Likelihood Estimation (MLE) for Carrier Frequency Offset estimation and correction in MIMO-OFDM systems. The proposed method makes efficient use of the frequency spectrum by unifying the two competitive carrier schemes - single carrier (SC) and multi-carrier (MC). The distortion resistance capability of the communication system is improved. The mean square error performance (MSE) of WFRFT-MIMO-OFDM systems is analyzed here.