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This paper shows that the performance of MIMO-OFDM system can be improved by using the efficient coding scheme. In this paper Optimum adaptive algorithms are applied to multicarrier system with Space-Time Block Coding (STBC) scheme over Rayleigh fading channels. This method has been employed in MIMO-OFDM system in order to overcome subchannel interference. OFDM has been adopted in several wireless standards such as Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB-T), the IEEE 802.11a Local Area Network (LAN) standard and the IEEE 802.16a Metropolitan Area Network (MAN) standard. OFDM converts a frequency-selective channel into a parallel collection of frequency flat subchannels.
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