研究在米型16-QAM單載波頻分多址系統中部分傳輸序列使用不同子區塊劃分的性能

Study of the Performance of Partial Transmit Sequences with Different Subblock Partitions in Asterisk 16-QAM SC-FDMA System

葉威志(Wei-Chih Yeh)

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(2017年)

摘要

單載波頻分多址已被長期演進標準選用為上行傳輸技術，並也被稱為擴展快速傅立葉轉換的正交分頻多工。相較於正交分頻多工技術而言，單載波頻分多址技術擁有更低的峰均功率比值，其中峰均功率比值是指傳送訊號的最大值比上它的平均值。若傳送訊號擁有高峰均功率比值時，它將會造成高功率放大器的效率降低。不過，由於單載波頻分多址系統的峰均功率比值會隨著所使用的M階調變之M值增加而提升。因此，本論文嘗試改善改善單載波頻分多址系統的峰均功率比值效能。
部分傳輸序列技術是屬於降低峰均功率比值的技術之一，它需在輸入調變訊號上使用相位擾亂以產生多個候選訊號。傳送訊號是從這些候選訊號中挑選出擁有最小峰均功率比值的訊號來進行傳送。本論文研究四種部分傳輸序列的子區塊劃分方式在16階米字形於單載波頻分多址系統，其中這些子區塊劃分方式都屬於隨機劃分。本論文的目的在於分析這些子區塊劃分方式的降低峰均功率比值性能，另外也研究將它們應用於16階正交振幅調變於單載波頻分多址系統。

關鍵字

部份傳輸序列 ； 峰均功率比值 ； 16階正交振幅調變 ； 16階米字形調變 ； 單載波頻分多址系統

並列摘要

Single Carrier Frequency Division Multiple Access (SC-FDMA), which has been selected as the uplink transmission technique of Long Term Evolution (LTE), is also called Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing (DFTS-OFDM). Moreover, SC-FDMA has a lower Peak-to-Average Power Ratio (PAPR) compared with Orthogonal Frequency Division Multiple Access (OFDMA), where PAPR is defined as the ratio of the peak power value to the average power value during signal transmission. It causes a decrease in the efficiency of high-power amplifiers if the transmitted signal with high PAPR. However, the PAPR of SC-FDMA increases with the M value in an M-ary modulation scheme. Therefore, this thesis tries to improve PAPR performance in SC-FDMA systems. Partial transmit sequence (PTS), which is one of PAPR reduction methods, entails exerting phase disturbance on the input modulation signals to generate multiple candidate signals. The candidate signal with the lowest PAPR is selected as the signal to be transmitted. This thesis studies four sub-block partition schemes for PTS in Asterisk 16-QAM SC-FDMA systems, where these sub-block partition schemes can be regarded as random partitioning. This thesis aimed to analyzes the PAPR reduction performance of these sub-block partition schemes, in addition to attempting to apply them to square 16-QAM modulated SC-FDMA systems.

並列關鍵字

PAPR ； Square16QAM ； Asterisk 16QAM ； PTS ； SC-FDMA

參考文獻

[1] T. Jiang and Y. Wu, “An Overview: Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals, ” IEEE Transactions on Broadcasting, vol. 54, No. 2, Jun. 2008.

[2] J. Ji, G. Ren, H. Zhang, “PAPR Reduction in Coded SC-FDMA Systems via Introducing Few Bit Errors,” IEEE Communications Letters, vol. 18, no. 7, Jul. 2014.

[3] N. Abu-Ali, A.-E.M Taha, M. Salah, H.Hassanein, “Uplink Scheduling in LTE and LTE-Advanced: Tutorial, Survey And Evaluation Framework,” IEEE Communications Surveys & Tutorials, vol. 16, no. 3, Aug. 2014.

[4] H. G. Myung, J. Lim, and D. J. Goodman, “Single carrier FDMA for uplink wireless transmission, ” IEEE Veh. Technol. Mag., vol. 1, no. 3, pp. 30-38, Sep. 2006.

[6] A. Mohammad, A. Zekry, and F. Newagy, “A time domain SLM for PAPR reduction in SC-FDMA systems,” in Proc. IEEE Global High Tech. Congr. Electron., Nov. 2012, pp. 143–147.