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The Worldwide interoperability for Microwave Access (WiMAX) wireless communication system gradually becomes research topic due to the advantages of high data rate, long transmission distance, wide coverage, and good quality of service technology. In WiMAX front-end circuits, the power amplifier is an important component, which decides the transmission coverage and entire efficiency of the system. The most critical issues for power amplifier design are linearity and efficiency. For WiMAX communication system, the modulation scheme is non-constant envelope so the linearity of power amplifier is more important than the efficiency.
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