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In this paper, a mitigation method for minimizing the distortion caused by frequency selective fast fading is illustrated. The proposed system combines between two types of diversity schemes; frequency diversity represented by the Orthogonal Frequency Division Multiplexing (OFDM) scheme and antenna diversity represented by Space Time Block Coding (STBC) scheme these are for mitigating the distortion caused by frequency selective fading. The multiplexing technique proposed here is the Code Division Multiple Access (CDMA) scheme which is considered the solution for eliminating the distortion caused by fast fading. The main problem of the OFDM system is the high Peak-to-Average Power Ratio (PAR). In the proposed system, three techniques used for reducing the PAR are applied together.
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