| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 105 === Technology about Orthogonal Frequency Division Multiplexing(OFDM) is used widely in digital communication system nowadays, but a problem called Peak-to-Average Power Ratio(PAPR) severely degrades the performance of OFDM. Bigger value of PAPR which causes distortion of signal when Power Amplifier(PA) attempts to amplify it, and the distortion also lowers the efficiency of PA and increases the complexity of both analog to digital and digital to analog converters (A/D and D/A). In this thesis, we propose a method called "non-symmetric T-R based PAPR Reduction Scheme with Multi-peak cancellation" to improve PAPR. In this method, we first use the algorithm of non-symmetric T-R to set PRTs, then generate the best peak reduction tone, and coordinate with PAPR Reduction Scheme with Multi-peak cancellation to achieve the purpose of lower PAPR. The T-R based PAPR Reduction Scheme we suggested, according to the computer simulation, can lower the value of PAPR more efficiently than conventional tone reservation can.
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