Modulation and De-Modulation Process of Orthogonal Frequency Division Multiplexing

3 Abstract: In this paper we address basic OFDM and related modulations and De-modulation, as well as techniques to improve the performance of OFDM for wireless communications, including energy efficient, time- and frequency-offset estimation and correction and multiple-input-multiple-output (MIMO) techniques. A general problem found in high speed communication is Inter-Symbol Interference (ISI). ISI occurs when a transmission interferes with itself and the receiver cannot decode the transmission correctly. Multiple-input- multiple-output and orthogonal frequency division multiplexing (MIMO-OFDM) systems provide high spectral efficiency for wireless communication system. The purpose of this paper is to process the modulation and De- modulation of Orthogonal Frequency Division Multiplexing.