請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/53962
標題: | 最佳前置訊號設計用於循環脈衝形正交分頻多工短封包之傳輸 Optimal Preamble Design for Short Packet Circularly Pulse-Shaped OFDM Transmissions |
作者: | Po-Lin Huang 黃柏霖 |
指導教授: | 蘇柏青(Borching Su) |
關鍵字: | 第五代行動通訊系統,大規模機器型通訊,超可靠度和低延遲通訊,短封包,前置訊號,領航信號,循環脈衝形正交分頻多工,波形,凸最佳化,蓋最小化, 5G,mMTC,URLLC,short packet,preamble,pilot sequence,circularly pulse-shaped OFDM (CPS-OFDM),waveform,convex optimization,majorization-minimization (MM), |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 本論文提出了一個基於循環脈衝形正交分頻多工調變的前置訊號最佳化設計,用於第五代行動通訊中大規模機器類型通信和超可靠度低延遲通信的子頻帶短封包傳輸。為了同時滿足週期性低自相關,低子頻帶外散射,低峰均功率比,和固定能量的四個前置訊號需求,我們制訂一個將複數領航符號送入循環脈衝形正交分頻多工傳送端作為變數的二階最小化問題。然後在蓋最小化和凸迭代演算法框架下使用半定放寬解決此問題。如模擬結果所示,我們所提出的最佳領航信號解產生的循環脈衝形正交分頻多工前置訊號,相比現存在第三代合作夥伴計劃規格中為第五代行動通訊定義的Zadoff-Chu和低峰均功率比序列產生的前置訊號,可以達到較低的自相關,子頻帶外散射,和峰均功率比。此外,雖然在沒有保護區間的循環脈衝形正交分頻多工系統下存在載波頻率偏移和區塊間干擾,但我們所提出的前置訊號比其他前置訊號由於其出色的時間偏移估測表現,所以仍可達到更好的封包資料檢測可靠度。 A preamble optimization design based on circularly pulse-shaped orthogonal frequency division multiplexing (CPS-OFDM) modulation for subband-wise short packet transmissions in 5G mMTC and URLLC is proposed in this thesis.To meet the four preamble signal requirements of periodically low autocorrelation (AC), low out-of-subband emission (OSBE), low peak-to-average power ratio (PAPR), and fixed energy simultaneously, a quadratic minimization problem is formulated by taking the complex-valued pilot symbols fed into the CPS-OFDM transmitter as variables. This problem is then solved under the majorization-minimization (MM) and convex-iteration (CI) algorithmic framework with semidefinite relaxation. As revealed in simulation results, the proposed CPS-OFDM preamble, resulting from the optimal pilot sequence solution, can achieve lower AC, OSBE, and PAPR, compared to the preambles produced by the existing Zadoff-Chu (ZC), and low-PAPR (LP) sequences defined in the 3GPP specifications for 5G New Radio (NR). In addition, although there exists carrier frequency offset (CFO) and inter-block interference (IBI) in the CPS-OFDM system without guard interval, the proposed preamble also leads to better packet data detection reliability than the others, because of its excellent timing offset (TO) estimation performance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/53962 |
DOI: | 10.6342/NTU202002358 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
U0001-0408202012075500.pdf 目前未授權公開取用 | 1.72 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。