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研究生:呂明軒
研究生(外文):LYU, MING-HSUAN
論文名稱:以似卡爾曼增益調整星座位置來降減OFDM訊號之PAPR值
論文名稱(外文):Constellation Adjustment by the Kalman-alike Gain for PAPR Reduction of OFDM Signals
指導教授:郝敏忠
指導教授(外文):HAO, MIIN-JONG
口試委員:蘇德仁陳巽璋賴秋雄郝敏忠
口試委員(外文):SU,DE-RENCHEN,SYUN-JHANGLAI,CIOU-SYONGHAO, MIIN-JONG
口試日期:2019-06-21
學位類別:碩士
校院名稱:國立高雄科技大學
系所名稱:電腦與通訊工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:英文
論文頁數:56
中文關鍵詞:正交分頻多工峰鈞功率比值主動式星座圖擴展法相似卡爾曼增益
外文關鍵詞:Orthogonal Frequency Division Multiplexing (OFDM)Peak Average Power Ratio (PAPR)Active Constellation Extension (ACE)
DOI:Kalman-alike Gain
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正交分頻多工(Orthogonal Frequency Division Multiplexing , OFDM)技術在無線網路、數位廣播、4G和移動通信是非常廣泛應用。OFDM 的優點是有效的利用頻譜和抗多重路徑衰減。然而OFDM也有高峰值平均功率比(Peak Average Power Ratio, PAPR)和對相位雜訊和頻率偏移的靈敏度的缺點。主動星座擴展(Active Constellation Extension, ACE)方法因其有效性和可信性而被廣泛用於降低PAPR的技術。
本論文提出了相似卡爾曼增益方法以提高PAPR降低性能在ACE方案中。通過設置臨界值,原始信號和截波信號之間的截波雜訊功率計算為系統誤差功率。由於截波是非線性變形,因此在頻域中,截波後的信號點將分佈的星座上。對應於每個粒子的測量誤差是實際星座點和原始星座點位置之間的距離,因此我們可以獲得相似卡爾曼的增益。新的星座點是通過根據量測更新方程式調整每個粒子的位置來實現的。重複此過程,直到達到所需的 PAPR 減少。模擬結果表明,該方法在可接受的BER效能內,可以比ACE方法在相同的計算時間內更有效地降低PAPR值。

The Orthogonal Frequency Division Multiplexing (OFDM) technology is very popular in wireless networks, digital broadcasting, 4G and beyond mobile communications. The advantages of OFDM are making efficient use of the spectrum and anti-multipath fading. However, OFDM also has the drawbacks of a high peak average power ratio (PAPR) and the sensitivity to phase noise and frequency offset. The Active Constellation Extension (ACE) method is widely used among these techniques for reducing PAPR due to its effectivity and credible way.
In this thesis, we propose the Kalman-alike Gain method for improving the PAPR reduction performance on the ACE scheme. By setting a threshold value, the clipping noise power between the original signal and the clipped ones is computed as the system error power. Since clipping is a nonlinear deformation, the clipped signal points will spread over the constellation in the frequency domain. The measuring error corresponding to each particle is the distance between the actual point and the original position, and then the Kalman-alike Gain is obtained. The new constellation is attained by adjusting the position of each particle according to the measurement update equation. Repeat the procedure until the required PAPR reduction is reached. Simulation results show that the proposed method can reduce the PAPR value more effectively within the acceptable BER efficiency than the ACE method in the same computing time.

誌謝
摘要
Abstract
List of Tables
List of Figures
Chapter 1 Introduction
Chapter 2 Basic Principles of Orthogonal Frequency Division multiplexing Systems.
2.1 OFDM System Description
2.1.1 Principle of OFDM Modulation Technology
2.1.2 Guard Interval and Carriers Orthogonality
2.2 PAPR Problem & Requirement of Reduction
2.3 Reduce PAPR Techniques
2.3.1 Clipping Method
2.3.2 Selected Mapping Method
2.3.3 Partial Transmit Sequence Method
2.3.4 Tone Reservation Method
2.3.5 Coding Method
Chapter 3 PAPR Reduction of OFDM Signals Using Active Constellation Extension
3.1 Principle of Active Constellation Extension
3.2 Constellation Adjustment by the Kalman-alike Gain
Chapter 4 Simulation Results and Discussion
4.1 Simulation Setup
4.2 Simulations and Results Comparisons
Chapter 5 Conclusions
References


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