在這個論文中， 我們提出一個在時域循環平移的部份傳輸序列 (PTS) 上保護旁資訊 (side information) 的技術用在渦輪編碼正交分頻多工系統 (TCOFDM) 和多輸入多輸出 (MIMO) 正交分頻多工系統上。 部份傳輸序列是一個常用的降低功率峰均比的技術， 它可以產生很多的候選訊號但是所需要的快速傅利葉計算卻比選擇性映射(SLM)小很多。 選擇性映射雖然可以產生很多差異性大的候選訊號， 但是每一個候選訊號都必須做一次的傅利葉轉換去看它的功率峰均比(PAPR)。 部份傳輸序列只要對分割過後的序列作快速傅利葉轉換， 然後再對這些訊號做處理過後把這些序列相加變成新的候選訊號。 因此我們就部份傳輸序列來做研究，並且著重在解決部份傳輸序列的旁資訊問題。 在循環平移的部份傳輸序列中， 我們可以藉由提出的分割方式達到更低的功率峰均比(PAPR)相對於傳統的分割方式。 旁資訊的軟估測被使用在渦輪編碼正交分頻多工系統上， 我們把前導碼 (pilot) 放在正交分頻多工的子載波上去觀察相位平移來得到旁資訊。 因為時域上的循環平移會導致頻域上的相位旋轉所以前導碼要放在頻域方便觀察。 我們提出反覆軟性估測來估測相位旋轉來得到旁資訊。 我們也把一些降低功率峰均比 的技術延伸到多輸入多輸出正交分頻多工系統像是咬尾選擇性映射 (SLM)， 選擇性映射-重複剪除濾波 (RCF)-蓄意功率提升 (DPB)， 一般的部份傳輸序列和時域循環平移的部份傳輸序列， 並且研究這些降低功率峰均比的技術的功率峰均比。

In this thesis, we propose a protection technique of side
information used in the time-domain circular shift based partial transmit sequence (PTS) scheme for both turbo coded orthogonal frequency-division multiplexing (TCOFDM) systems and multiple-input-multiple-output (MIMO) OFDM systems. In circular shift based PTS, we can achieve lower peak-to-average ratio (PAPR) with proposed partition than conventional partition. The soft estimation of side information is used in TCOFDM, and we will insert some pilots into some OFDM tones and observe the phase shifts of
these pilots to obtain the side information. Since the circular shift in the time domain will introduce phase rotation in the frequency domain, the pilots are inserted in frequency domain. We propose iterative soft estimation to estimate the phase rotation and hence side information. We also extend some PAPR-reduction techniques such as tail-biting selective-mapping (SLM), SLM-repeating clipping and filtering (RCF)-Deliberate Power Boost (DPB), conventional PTS and time-domain circular shift based PTS to MIMO-OFDM systems, and investigate the PAPR performance of these
PAPR-reduction techniques.

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