軟體定義無線電平台中實務射頻前級之可適性預失真設計與實現

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賴庭宇(Ting-Yu Lai) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

軟體定義無線電平台中實務射頻前級之可適性預失真設計與實現
(Design and Implementation of Adaptive Digital Pre-Distortion for Practical RF Frontend in a SDR Platform)

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摘要(中)

近年來隨著無線多媒體影音的蓬勃發展，使得無線通訊系統必須在有限的頻寬下傳輸大量的資料，為能有效利用頻寬資源，新一代無線通訊標準普遍採用正交分頻多工(Orthogonal Frequency Division Multiplexing，OFDM)為主的調變技術。LTE(Long Term Evolution)系統是由3GPP(3rd Generation Partnership Project)所提出的第四代行動通訊系統。LTE下行鏈路採用了OFDMA(Orthogonal Frequency Division Multiple Access)系統，它是根據OFDM(Orthogonal Frequency Division Multiplexing)系統演進而來，上行鏈路則採用單載波分頻多工(Single-Carrier Frequency DivisionMultiple Access，SC-FDMA)系統。SC-FDMA 是由OFDMA 演進，也被叫做線性預編碼OFDMA技術，因此LTE上行鏈(UL)與下行鏈(DL)技術十分類似，但SC-FDMA的特徵是輸出單載頻發射信號。由於SC-FDMA 是將每個子載波上的調變符號，在相同時間做線性合併，故每個子載波上皆有各個訊號的分量，使得SC-FDMA系統比起 OFDMA 系統具有較低的峰值/平均功率比 (Peak-to-Average Power Ratio，PAPR)。如此一來，就可以提高移動終端的功率發射效率，節省電池的消耗，降低終端成本。然而，對下行鏈路而言，預失真就顯出其重要性了。
另外，I/Q Imbalance的影響也會讓硬體干擾訊號的品質，所以I/Q補償對於硬體來說也是很重要的。

摘要(英)

In recent years, development of wireless multimedia is rapid. To make wireless communication systems must transfer large amount of data in a limited bandwidth for effective use that bandwidth resources. Next generation wireless communication standard commonly use the Orthogonal Frequency Division Multiplexing (OFDM) modulation technology. LTE (Long Term Evolution) system was developed by 3GPP (3rd Generation Partnership Project) proposed by the fourth generation of mobile communication systems. LTE downlink uses OFDMA (Orthogonal Frequency Division Multiple Access) system, which is based on OFDM system evolved, uplink uses single carrier frequency division multiplexing access (SC-FDMA) systems. SC-FDMA is an evolution of the OFDMA, also known as linear pre-coding OFDMA technology. LTE uplink(UL) and downlink(DL) technology is very similar, but SC-FDMA is characterized by the output of a single carrier frequency transmission signal. SC-FDMA is the modulation symbols for each subcarrier at the same time to do linear combination, so each sub-carrier signal of measure vector is respective. Make SC-FDMA system better than OFDMA system with lower peak/average power ratio (Peak-to-Average Power Ratio, PAPR). In this way, it is possible to improve the power transmission efficiency of the mobile terminal and save battery consumption and reduce the cost of the terminal. However, for the downlink, Pre-Distortion show the importance for OFDM system.

In addition, the impact of I / Q Imbalance is allow to affect hardware to interfere with the quality of the signal, so I / Q compensation for the hardware is very important too.

關鍵字(中)

★ OFDM
★ SC-FDMA
★ 軟體定義無線電
★ 預失真
★ IQ補償

關鍵字(英)

★ OFDM
★ SC-FDMA
★ SDR Platform
★ Pre-distortion
★ IQ compensation

論文目次

目錄
中文摘要……………………………………………….………………………………………........i
ABSTRACT…………………………………………………………………………………….........ii
謝誌…………………………………………………………………………………………...........iii
目錄……………………………………………………………………………………………..........iv
圖目錄………………………………………………………………………………………….........vi
表目錄………………………………………………………………………………………….........x
第一章緒論
1.1研究動機與背景.................................1
1.2 章節提要......................................2
第二章數位訊號與系統介紹
2-1 訊號系統......................................4
2-1-1 OFDM系統....................................4
2-1-2 SC-FDMA系統.................................11
2-1-3 單載波系統..................................12
2-2 PAPR對數位系統的影響...........................14
第三章非理想系統對訊號的影響
3.1 非線性功率放大器...............................20
3.1.1 功率放大器之非線性特性........................20
3.1.2模擬非線性功率放大器對訊號的影響................23
3.2 I/Q Imbalance 效應.............................30
3.2.1理想和非理想RF up converter...................30
3.2.2 模擬I/Q Imbalance對訊號的影響.................31
第四章預失真線性化技術和I/Q 補償
4.1 預失真線性化技術................................36
4.1.1預失真線性化技術介紹...........................36
4.1.2預失真線性化技術的硬體架構......................42
4.2.3有預失真和沒有預失真的差異......................48
4.2 I/Q compensation技術...........................56
4.2.1 I/Q compensation介紹.........................56
4.2.2 IQ compensation的硬體架構....................57
第五章調適性硬體預失真和I/Q 補償設計
5.1調適性硬體預失真.................................60
5.2調適性硬體I/Q補償................................63
第六章軟體定義無線電
6.1 軟體定義無線電..................................64
6.2 軟體定義無線電平台..............................64
6.3 MATLAB to SIMIS Engine IC.....................65
6.4 FPGA(AC701)....................................66
6.5 RF module(AD9361).............................67
6.6 實驗結果.......................................68
第七章實務呈現結果
7.1調適性硬體預失真.................................72
7.2調適性硬體I/Q 補償...............................76
第八章結論.........................................78
參考文獻............................................79

參考文獻

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指導教授

陳逸民(Yih-Min Chen)

審核日期

2018-1-12

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