摘要
載波干涉-正交分頻多工(CI-OFDM)技術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)。本篇論文主要針對載波干涉-正交分頻多工系統，探討在不影響錯誤率的情況下進一步降低其均峰值功率比。我們使用廣義傅利葉轉換(GDFT)及一位元選擇性映射法 (Selected Mapping Method)去改善載波干涉-正交分頻多工系統的均峰值功率比。本論文針對廣義傅利葉轉換提出一個新的對角矩陣，可較原對角矩陣更進一步降低系統均峰值功率比。並將此一矩陣配合一位元選擇性映射以進一步改善系統效能。由電腦模擬後，所提出的方法可有效降低系統均峰值功率比，同時對載波頻率偏移的估測及位元錯誤率不會造成影響。
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, and it also can reduce peak-to-average power ratio (PAPR) significantly. In this paper, we aim to improve the CI-OFDM systems by reducing the system’s PAPR without loss of bit error rate. We use both generalized Discrete Fourier transform (GDFT) and 1-bit selected mapping method (SLM) to improve CI-OFDM systems. In GDFT, we propose a new diagonal matrix to improve the system’s PAPR. We further use this matrix in 1-bit SLM to improve the CI-OFDM systems. After the computer simulations, our results show that these methods can significantly reduce the PAPR of CI-OFDM systems without affecting the carrier frequency offset estimation and bit error rate