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FDMA, TDMA and CDMA are the well known multiplexing techniques used in wireless communication systems. While working with the wireless systems using these techniques various problems encountered are multi-path fading, time dispersion which lead to Inter-Symbol Interference (ISI), lower bit rate capacity, requirement of larger transmit power for high bit rate and less spectral efficiency. With the investigation of 802.11a standard provides better solution for the above mentioned problems. In 802.11a standard of multicarrier transmission, a single data stream is transmitted over a number of lower rate subcarriers to provide high data rates. 802.11a wireless standard provides a specification for distributing the data over a large number of carriers that are spaced apart at precise frequencies.
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