| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 96 === The orthogonal frequency division multiplex (OFDM) system has an advantage of high bandwidth efficiency, and is able to resist the multipath fading interference; its major disadvantage is high peak to average power ratio (PAPR). The signal passing a power amplifier will be clipped depending on the operation point of the power amplifier. This clipped signal results in distortion. It is important how to reduce PAPR effective.
In this thesis, we propose a novel PAPR reduction technique in OFDM systems. The technique was based on phase reversal and the influence on input symbol. and output symbols. Furthermore, we also propose a new metric for MBAP. The new metric is using the distance between contribution of input symbol and output symbol to determine the correlation. We will introduce various PAPR reduction techniques at first. Next, we will introduce ours propose PAPR reduction technique in this we call reverse phase technique. Reverse phase have simplicity and low complexity, so we can utilize propose technique to combine with partial transmit sequence (PTS) and amplitude predistortion (AP). Finally, we will analyze ours propose technique and other combination cases to rely on computer simulation. We utilize simple combination cases to achieve PAPR reduction and improve performance.
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