Abstract
Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multicarrier modulation (MCM) with heavily spaced subcarriers as well as overlapping spectra was patented in the United States of America in 70s. Orthogonal Frequency Division Multiplexing has been popularly utilized in modern days due to its ability for spectral efficiency and robustness to noise and fading. It provides flexibility and agile spectrum allocation in case of cognitive radios. This paper will focus on OFDM research and simulation for enhancement of spectral efficiency. OFDM is especially compatible for high-speed wireless communication due to its resistance to Inter symbol Interference. As in modern days communication systems has increased their data transfer speed, the required time for each transmission has become very short. As delay time due to multipath remains constant, Inter symbol interference became limitation in high-data-rate communication. OFDM avoids this difficulty by transmitting numerous low speed transmissions simultaneously
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