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Modulation is one of the most important characteristics used in signal waveform identification for wireless communications. As the demand of high-quality service in next-generation wireless communication systems increases, a high performance of data transmission requires an increase in spectral efficiency and an improvement in error performance of wireless communication systems. Orthogonal Frequency Division Multiplexing (OFDM) technology, which can effectively combat frequency-selective fading properties caused by multi-path transmission. OFDM is widely recognized as the key technology for the next generation Broadband Wireless Communication (BWC) systems. Besides high spectral efficiency, reliable performance over fast fading channels is becoming more and more important for OFDM-based BWC systems, especially when high speed cars, trains and subways are playing an increasingly indispensable role in the people daily life.
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