Abstract: “The demand for wireless systems has been growing rapidly over the recent years due to improved reliability, high data rates, seamless connectivity and low deployment costs. MIMO systems are the most efficient leading innovation of wireless systems for maximum capacity and improved quality and coverage. Multiple Input Multiple Output (MIMO) in combination with Orthogo nal Frequency Division Multiplexing (OFDM) can provide spectrally efficient and ISI free communication. The Fractional Fourier transform (FrFT), as a generalization of the classical Fourier Transform, was introduced many years ago in mathematics literature . In this paper selecting the optimal order of the fractional Fourier transform, the modulated signals can match the time - varying channel characteristics, which results in a mitigation of the inter carrier interference. Furthermore, an algorithm is present ed for selecting the optimal order of fractional Fourier transform, and the impact of system parameters on the opt”

Keywords: Fractional Fourier transform, MIMOOFDM, inter carrier interference