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博碩士論文 etd-0902103-191323 詳細資訊
Title page for etd-0902103-191323
論文名稱
Title
非線性放大器對跳頻多重進接系統之影響
Effect of Nonlinear Amplifier on Frequency Hopping Multiple Access Systems
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
68
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2003-07-22
繳交日期
Date of Submission
2003-09-02
關鍵字
Keywords
跳頻系統、非線性放大器
nonlinear amplifier, frequency hopping
統計
Statistics
本論文已被瀏覽 5754 次,被下載 5889
The thesis/dissertation has been browsed 5754 times, has been downloaded 5889 times.
中文摘要
中文摘要
展頻技術主要可分為直接序列展頻與跳頻展頻兩種,可將訊號展開在展頻頻譜上進而增加訊號頻寬。而在抗干擾能力上,跳頻展頻系統則較優於直接序列展頻系統。跳頻系統主要可分為快跳頻與慢跳頻兩種;快跳頻系統的跳躍率大於信號傳輸速率,而慢跳頻系統的跳躍率則小於信號傳輸速率。利用快跳頻系統本身具備的時域與頻域多維接收特性,可應用適當的分集接收技術提升系統性能而無需利用錯誤更正碼,但因相位的不連續性,無法使用同相解調方式為其缺點。
在衛星通訊上的高功率放大器多使用行波管放大器。其具有非線性特性,會對輸出訊號產生兩種失真,分別為振幅調變(AM/AM)及相位調變(AM/PM)的失真。要避免系統產生非線性失真,可以利用適當的輸入退據來保證放大器操作在線性區,但為了得到較大的輸出功率,放大器往往操作在飽合區而造成嚴重的非線性失真。
在此篇論文中,將針對應用二位元跳頻頻移鍵調變的跳頻多重進接系統,探討此系統在傳送端經非線性放大後,非線性失真對系統性能之影響。吾人選定用以表示行波管放大器及固態微波放大器特性的兩種非線性放大器模型,討論非線性失真對系統性能之影響。其後以固定通道雜訊的方式,經由計算其整體性能衰減來得到非線性放大器在功率效率及互調干擾影響的取捨間,較佳的操作點。另外,在輸入訊號大小一致,且單一載波輸出訊號及三階互調項大小已知的條件下,吾人得出在只考慮三階互調干擾條件下,系統的位元錯誤率。
Abstract
Abstract
Spread spectrum technique modifies the signal spectrum to spread it out and increase its bandwidth. There are two major methods in spread spectrum technique: direct sequence and frequency hopping. The resistance capability of jamming signal for frequency hopping system is better than that for direct sequence system. Two types of frequency hopping techniques can be distinguished. In “fast frequency hopping” the period of a frequency-hop is smaller than a data symbol-period while in “slow frequency hopping” the period of a frequency-hop is larger than a data symbol-period. Fast frequency hopping systems have the advantages that the error correction codes are not needed and diversity can be applied. The disadvantage of fast frequency hopping system is that coherent data detection is not possible because of phase discontinuities.
Traveling wave tube amplifier is often used in satellite communications. It has nonlinear characteristics which can be classified as nonlinear amplitude and phase distortions toward the output signals. Certain backoff input power makes the amplifier work within the linear region. However, in order to have more output power, the amplifier usually operates in the saturation region and in consequence serious nonlinear signal distortion would be introduced.
In this thesis, the effect of nonlinear amplifier on a frequency hopping multiple access (FHMA) system with binary frequency shift keying is discussed. In the simulation, two types of nonlinear amplifiers, traveling wave tube amplifier and solid state power amplifier, are applied to the FHMA system. Tradeoff between power efficiency and performance degradation is determined by the index of total performance degradation, which is obtained from simulation. With known single carrier output power, third-order intermodulation, and same input power, the bit error rate performance is also analyzed.
目次 Table of Contents
目 錄
誌 謝 i
中文摘要 ii
Abstract iii
目 錄 v
圖 表 索 引 vii
第一章 前言 1
1-1 簡介 1
1-2 研究動機 2
第二章 BFSK/FHMA系統 4
2-1 跳頻展頻系統簡介 4
2-2 BFSK/FHMA系統設定 5
2-2-1 跳躍頻帶配置 7
2-2-2 跳躍速率 7
第三章 非線性放大器 9
3-1 非線性放大器系統模型 9
3-2 非線性放大器特性 15
3-2-1 線性區 15
3-2-2 飽合點(saturation point) 16
3-2-3 1-dB壓縮點(1-dB compression point) 16
3-2-4 操作點(operating point) 17
3-2-5 互調干擾(intermodulation interference) 18
3-2-6 小訊號抑制(small signal suppression) 23
第四章 BFSK/FHMA系統在非線性放大器下之性能 25
4-1 系統模型 25
4-2 互調干擾分布 27
4-3 BFSK/FHMA系統在非線性放大器下之性能分析 43
第五章 系統性能模擬與討論 47
5-1 非線性放大器模型 47
5-1-1 行波管放大器(traveling wave tube amplifier, TWTA) 47
5-1-2 固態微波放大器(solid state power amplifier, SSPA) 49
5-1-3 冪級數展開式 50
5-2 互調干擾對系統性能影響之模擬 54
5-2-1 操作點對系統性能之影響 55
5-2-2 用戶數對系統性能之影響 56
5-2-3 輸入訊號大小對系統性能之影響 60
5-3 功率效率(power efficiency) 60
第六章 結論 65
參考文獻 67
參考文獻 References
參考文獻
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