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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 鐘嘉德(Char-Dir Chung) | |
dc.contributor.author | Po-Hsien Wang | en |
dc.contributor.author | 王博賢 | zh_TW |
dc.date.accessioned | 2021-06-07T17:41:20Z | - |
dc.date.copyright | 2020-07-16 | |
dc.date.issued | 2020 | |
dc.date.submitted | 2020-07-14 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/15503 | - |
dc.description.abstract | 在固定環境的傳輸系統中,若傳送端取得通道資訊時,結合了正交分頻多工(OFDM)的頻譜預編碼(spectral precoding)以提供非常緊密的訊號頻譜和降低峰均功率比(PAPR),並使用通道資訊進行預等化,使其分別達到最大化的通道容量、線性最小化均方誤差及最小化近似位元錯誤率。首先針對發送的N個次載波的OFDM訊號設計通用預編碼器,採用預編碼率1-2I/N,將N-2I個符元加入2I個冗餘(redundancy),以提供非常小的頻譜旁波,衰減的漸進速度為 f^(-2I-2),其中f是以Hz為單位的頻率,從而實現高頻譜緊密度;再結合通道資訊,在固定平均傳輸功率下設計頻譜預等化器,並加入了降低峰均功率比的功能。而在接收端,設計了線性最小均方誤差頻域等化器來進行錯誤率的模擬。本篇所提出的預等化和頻譜預編碼正交分頻多工(PSP-OFDM)系統提供非常接近預等化OFDM的通道容量,同時能保證頻譜的緊密度,進一步提供比頻譜預編碼、頻譜預等化或無預編碼的系統更高的頻譜效率。 | zh_TW |
dc.description.abstract | For fixed frequency-selective dispersive channels. When the channel state information is known at transmitter, besides spectral precoding for rectangularly-pulsed orthogonal frequency-division multiplexing (OFDM) using cyclic prefix is studied to provide extremely compact signal spectrum and reduced peak-to-average power ratio (PAPR), the channel information is used to pre-equalize the signal to achieve maximum capacity (MC), linear minimum mean square error (LMMSE), and approximate minimum bit error rate (AMBER), respectively. With a precoding rate 1-2I/N and thus introducing 2I degrees of redundancy, a general spectral precoder is first developed for N-subcarrier OFDM signal to provide extremely small spectral sidelobes decaying asymptotically as f^(-2I-2), with f being the frequency in hertz. Incorporating the channel information, the spectral pre-equalizer is then designed for the fixed average transmitting power, and combine the function of reducing PAPR. For the error rate simulation, a linear minimum mean-square-error frequency domain equalizer is designed for the corresponding OFDM receiver. The proposed pre-equalized and spectrally precoded (PSP) OFDM system is shown to provide channel capacity which is very close to pre-equalized OFDM. When a small out-of-band power proportion is required to guarantee compact signal spectrum, the proposed PSP-OFDM system can further provide much higher spectral compactness than pre-equalized OFDM, spectrally precoded OFDM, and nonprecoded OFDM, all conveying the same data rate. | en |
dc.description.provenance | Made available in DSpace on 2021-06-07T17:41:20Z (GMT). No. of bitstreams: 1 U0001-1407202009035200.pdf: 3623124 bytes, checksum: 85dd2778ecd085d3a3e0f70db8df9585 (MD5) Previous issue date: 2020 | en |
dc.description.tableofcontents | 口試委員會審定書 i 致謝 ii 摘要 iii Abstract iv 符號 v 圖目錄 viii 表目錄 ix 第一章 緒論 1 第一節 正交分頻多工簡介 1 第二節 旁波瓣抑制 1 第三節 旁波瓣抑制之線性預編碼技術 3 (1) SBPM編碼 4 (2) UIα編碼 4 (3) SI編碼 5 第四節 透過通道資訊強化效能 6 第五節 頻譜預編碼與通道預等化技術 6 第六節 論文動機 7 第二章 預等化器與頻譜預編碼器 8 第一節 訊號模型 8 第二節 抑制頻譜旁波瓣的頻譜預編碼器 9 第三節 抑制峰均功率比的頻譜預編碼器 11 第四節 通道預等化器 14 (1) MC-PSP 16 (2) LMMSE-PSP 19 (3) AMBER-PSP 21 第五節 結果呈現 24 (1) 頻譜緊密度 25 (2) 通道容量 28 (3) 頻譜效率 30 (4) 峰均功率比 31 第三章 接收端設計與性能 32 第一節 LMMSE資料估測與偵測 32 第二節 最大化通道容量預等化器的次佳解 33 第三節 最大化通道容量預等化器的碼率分配 36 第四節 位元錯誤率 37 第五節 通道估測錯誤的效應 40 第六節 實現複雜度 44 第四章 結論 46 參考文獻 47 中英對照表 52 | |
dc.language.iso | zh-TW | |
dc.title | 結合頻譜預等化與降低峰均功率比之頻譜預編碼正交分頻多工系統 | zh_TW |
dc.title | Spectrally Precoded OFDM with Pre-equalization and Reduced PAPR | en |
dc.type | Thesis | |
dc.date.schoolyear | 108-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 陳維昌(Wei-Chang Chen) | |
dc.contributor.oralexamcommittee | 蘇育德(Yu-Ted Su),王晉良(Chin-Liang Wang),馮世邁(See-May Phoong) | |
dc.subject.keyword | 正交分頻多工,頻譜緊密度,道道容量,預等化,峰均功率比, | zh_TW |
dc.subject.keyword | Orthogonal frequency-division multiplexing,spectrum compactness,channel capacity,channel pre-equalization,peak to-average power ratio, | en |
dc.relation.page | 54 | |
dc.identifier.doi | 10.6342/NTU202001494 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2020-07-14 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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