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研究生:陳瑋廷
研究生(外文):Wei-Ting Chen
論文名稱:前級非理想特性對正交分頻多工無線區域網路傳收機影響之研究
論文名稱(外文):A Study of OFDM Wireless LAN Transceiver under Front-end Non-idealities
指導教授:李大嵩李大嵩引用關係
指導教授(外文):Ta-Sung Lee
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:92
中文關鍵詞:正交分頻多工峰均值功率比I-Q 不平衡
外文關鍵詞:Orthogonal Fequency Division Multiplexing (OFDM)peak-to-average-power ratio (PAPR)I-Q imbalance
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  • 被引用被引用:1
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無線區域網路IEEE 802.11a採用正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)的技術,可以抵抗多重路徑(multipath)的效應,同時能提供高速傳輸,但須解決OFDM訊號具有高峰均值功率比(peak to average power ratio, PAPR)的問題。在本論文中,吾人評估使用編碼與攪亂子載波訊號相位的方式對降低OFDM訊號PAPR的效能與複雜度,同時尋求適於IEEE 802.11a規格之解決方案。另一方面,吾人將探討無線傳收機之非理想特性對OFDM系統的影響,諸如類比電路的不匹配造成I-Q不平衡(I-Q imbalance)的效應,振盪器的頻率飄移與相位雜訊引起的載波間干擾(ICI),放大器造成之非線性失真等。吾人將介紹適用於IEEE 802.11a規格的架構與演算法,估測出訊號的失真並加以補償。整體而言,本論文將針對IEEE 802.11a之系統規格,謀求上述非理想特性的解決之道。
OFDM (Orthogonal Frequency Division Multiplexing) in wireless local area networks, such as IEEE 802.11a, is a promising technology for combating multipath propagation and maintaining high data rate transmission. A major drawback of OFDM is its high peak to average power ratio (PAPR). In this thesis, we first investigate coding and scrambling techniques for PAPR reduction and evaluate their performance and complexity. We then try to find suitable solutions for the IEEE 802.11a OFDM system. On the other hand, we will study the OFDM system under non-ideal front-end effects such as I-Q imbalance, carrier frequency offset, phase noise and power amplifier nonlinearity. In particular, we will introduce useful architectures and algorithms in order to compensate for the signals distortions due to non-idealities in the IEEE 802.11a system.
第一章 續論 1
第二章 正交分頻多工與無線傳收機架構 4
2.1 OFDM系統 4
2.2 無線傳收機架構 6
2.2.1 直接轉換(Direct-conversion)傳收機架構 6
2.2.2 超外差式(Super-heterodyne)傳收機架構 8
2.2.3 低中頻(Low-IF)傳收機架構 9
第三章 數位中頻傳收機 14
3.1 數位中頻傳收機架構 14
3.2 直接數位頻率合成器(DDFS) 16
3.2.1 主要架構 16
3.2.2 降低唯讀記憶體容量 18
3.3 升降頻轉換與帶通取樣(Bandpass Sampling) 19
3.3.1 升降頻轉換 19
3.3.2 帶通取樣(Bandpass Sampling) 21
3.4 設計範例 22
3.5 電腦模擬與分析 23
第四章 降低OFDM訊號之峰均值功率比(PAPR) 38
4.1 峰均值功率比(PAPR) 38
4.2 造成訊號失真之峰均值功率比降低方法 41
4.2.1 截波(Clipping)與峰值視窗限制(Peak Windowing) 41
4.2.2 峰值消除法(Peak Cancellation) 42
4.3 無失真之峰均值功率比降低方法 43
4.3.1 編碼 43
4.3.2 選擇映射(Select Mapping) 44
4.3.3 部分傳輸序列(Partial Transmit Sequence) 45
4.3.4 頻帶保留(Tone Reservation) 46
4.4 電腦模擬與分析 48
第五章 前級非理想特性對OFDM訊號之影響及解決方案 59
5.1 非線性放大器 61
5.1.1 非線性放大器模型 61
5.1.2 非線性失真與補償 63
5.2 I-Q不平衡 64
5.2.1 振幅與相位不平衡 64
5.2.2 適應性頻域等化器 66
5.2.2 I-Q不平衡的估測與補償 67
5.3 載波頻率飄移與相位雜訊 69
5.4 電腦模擬與分析 71
第六章 結論與討論 84
參考文獻 87
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