利用改良式選擇性映射與部份傳送序列技術改善單載波分頻多重存取系統之峰值對均值功率比

PAPR Reduction in SC-FDMA Systems by Using Modified SLM and PTS Schemes

洪志宇(Chih-Yu Hung)

指導教授 ： 曾德樟

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2014年)

摘要

長期演進技術(Long Term Evolution, LTE)是目前市場上備受矚目的新一代行動無線通訊系統，而單載波分頻多重存取系統(Single Carrier Frequency Division Multiple Access, SC-FDMA)是LTE上行鏈路的主流技術。
雖然SC-FDMA較其它技術有更好的峰值對均值功率比(Peak-to-Average Power Ratio, PAPR)，但其PAPR問題依舊存在，故本文針對SC-FDMA之PAPR及頻譜相關特性加以探討。首先，本文使用選擇性映射(Selected Mapping, SLM)和部份傳送序列(Partial Transmit Sequence, PTS)技術，並採用混沌(Chaotic)序列作為其相位序列與子區塊分配之方式，藉此改善PAPR，但上述之技術需傳送額外輔助資訊造成頻寬浪費，所以本文利用輔助資訊配置法(Side Information Allocation, SIA)將輔助資訊配置於保護區間(Guard Interval)中，以達到提升頻譜效率的目的。模擬結果顯示，在位元錯誤率(Bits Error Rate, BER)維持不變的情況下，SC-FDMA之PAPR和頻譜使用效率均獲得有效改善。

關鍵字

單載波分頻多重存取 ； 輔助資訊 ； 峰值對均值功率比

並列摘要

The long term evolution (LTE) is an industrial standard for wireless communication to provide high-speed data transmission for data terminals. Single carrier frequency division multiple access (SC-FDMA) is the main technique used in LTE uplink access.
Although the SC-FDMA has lower peak-to-average power ratio (PAPR) than other orthogonal frequency division multiple access (OFDMA) systems, PAPR reduction is still one of the issues for SC-FDMA systems. This thesis is mainly to investigate the effect of both the PAPR reduction and the spectral efficiency of the systems. It this thesis, we propose two methods, modified selected mapping (SLM) and partial transmit sequence (PTS), both combined with a chaotic sequence to reduce the PAPR. In addition, a side information allocation (SIA) method was used to improve the spectral efficiency of the SC-FDMA systems. Experimental results show that the proposed schemes not only improve the spectral efficiency of the systems but also achieve lower PAPR than the conventional SC-FDMA systems.

並列關鍵字

SC-FDMA ； PAPR ； Side Information

參考文獻

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