結合乘積碼與星座圖延伸技術來降低單載波 頻分多址的峰均功率比值

Combining the Product Code Technique and Constellation Extension Scheme to Reduce the PAPR of SC-FDMA Systems

詹以群(Yi-Chun Jhan)

指導教授 ： 梁新潁

朝陽科技大學/資訊學院/資訊與通訊系/碩士(2016年)

摘要

單載波頻分多址技術 (single carrier frequency division multiple access, SC-FDMA) 可視為一種改良型的正交分頻多工 (orthogonal frequency division multiplexing,OFDM) 技術。它除了能有效的克服選擇性頻率衰減通道 (frequency selective fading channels) 與良好的頻譜效率外，它同時也可達到高資料傳輸速度與低複雜度接收器等優點。單載波頻分多址技術因為單載波結構的特性，使它擁有較好的峰均功率比值 (peak-to-average power ratio, PAPR)，而此特性不但可以提高移動終端的功率發射效率，也同時延長設備電池的使用夀命。綜合上述優點，單載波頻分多址技術已被長期演進技術 (long term evolution, LTE) 選用為上行傳輸 (uplink) 的主要技術。
本篇論文提出一種新的架構來改善M-級相位鍵移 (M-ary phase shift keying，M-PSK) 調變之單載波頻分多址技術的峰均功率比值效能，其中該方法是藉由結合星座圖延伸技術 (constellation extension scheme, CES) 和乘積碼 (product codes) 二項技術。模擬結果顯示本論文推薦方法之峰均功率比值效能不只優於傳統M-級相位鍵移調變在單載波頻分多址技術，它還同時具有錯誤更正能力。

關鍵字

單載波頻分多址技術 ； M-級相位鍵移 ； 峰均功率比值 ； 乘積碼 ； 星座圖延伸技術 ； 錯誤更正碼 ； 長期演進技術

並列摘要

Single carrier frequency division multiplexing access (SC-FDMA), which can be regard as a modified orthogonal frequency division multiplexing technique, is currently used as the uplink transmission of the long term evolution (LTE) standard. However, SC-FDMA still has deficiencies that must be improved, such as high peak-to-average power ratio (PAPR) occurring in the transmission signal. Therefore, to improve the PAPR performance of the SC-FDMA technique is currently a prominent research topic. This thesis presents a new method to reduce PAPR, Wherein the method is by combining constellation extension scheme (CES) and the product code on the various M-ary phase shift keying (M-PSK) modulation of SC-FDMA system. The simulation results show the effectiveness of the proposed scheme PAPR in not only superior to the conventional SC-FDMA technology, but also a combination of channel coding techniques, Thereby reducing the complexity of the entire circuit.

並列關鍵字

SC-FDMA ； LTE ； Product code ； CES ； PAPR ； M- PSK ； Channel Coding

參考文獻

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