使用廣義傅立葉轉換降低正交分頻多工系統均峰功率比之研究

The Research of the PAPR Reduction in OFDM Systems Using GDFT

簡廷軒(Ting-Shuian Jian 簡廷軒)

指導教授 ： 呂振森

國立臺北科技大學/電資學院/電機工程系所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00883

摘要

載波干涉-正交分頻多工(CI-OFDM) 系統繼承了正交分頻多工調變(OFDM)技術的高頻譜效率及無符碼間干擾等優點，並可大幅降低均峰值功率比(PAPR)。一個載波干涉-正交分頻多工(CI-OFDM)系統可視為廣義傅立葉轉換-正交分頻多工系統(GDFT-OFDM)的一個形式。本論文主要探討在不降低位元錯誤率下，使用廣義傅立葉轉換(GDFT)於正交分頻多工(OFDM)系統，降低系統均峰功率比。本論文中提出一個特殊形式的GDFT矩陣，此一矩陣是由傅立葉轉換(DFT)矩陣結合前後對角矩陣所構成。經由電腦模擬，我們所提出的方法比其他使用類似方法能更有效降低系統均峰值功率比。

關鍵字

正交分頻多工 ； 廣義傅利葉轉換 ； 均峰值功率比 ； 載波干涉-正交分頻多工

並列摘要

The technique of carrier-interferometry orthogonal frequency division multiplexing (CI-OFDM) inherits many advantages of OFDM technique including high bandwidth efficiency and no inter-symbol interference. It can also reduce peak to average power ratio (PAPR) significantly. The CI-OFDM system can be seen as a form of OFDM systems combined with generalized Discrete Fourier Transform (GDFT). In this thesis, we aim to reduce the PAPR without increasing bit error rate (BER) by using GDFT in the OFDM system. We propose a special form of GDFT which consists of a DFT matrix combined with both front and rear diagonal matrices. After the computer simulations, the results show that our method is better than other methods using GDFT in OFDM systems.

並列關鍵字

OFDM ； GDFT ； Peak to Average Power Ratio ； Carrier-Interferometry OFDM

參考文獻

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[8] 佘家瑋，載波干涉-正交分頻多工系統之效能改進，碩士論文，國立台北科技大學電機工程研究所，台北，2012。

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