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研究生:塗松偉
研究生(外文):Tu Song-Wei
論文名稱:鎖幅迴路系統之正交分頻多工系統應用
論文名稱(外文):Orthogonal Frequency Division Multiplexing Applicationfor Amplitude-Locked Loop System
指導教授:鐘國家鐘國家引用關係
指導教授(外文):Gwo-Jia Jong
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:電子工程系
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:101
畢業學年度:100
語文別:英文
論文頁數:78
中文關鍵詞:正交分頻多工系統通道估計頻率估計頻率偏移載波干擾星座圖鎖幅迴路
外文關鍵詞:Orthogonal frequency division multiplexingChannel estimationFrequency estimationFrequency offsetCarrier interferenceconstellationsAmplitude-locked loop
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正交分頻多工系統(Orthogonal Frequency Division Multiplexing)是目前無線通訊中重要的技術之ㄧ,在無線傳輸中,訊號傳送的過程會受到通道的破壞,因此在接收端的通道估計(channel estimation)是非常重要的。在正交分頻多工系統,實驗頻率估計(frequency estimation)與補償後的頻率偏移(frequency offset)所引起的載波干擾(carrier interference)如果很微小時則可忽略,但其他所剩餘的頻率偏移則會造成相位在星座圖(constellations)上的旋轉,導致做出錯誤的決策。
本論文中應用於無線通道環境下,以正交分頻多工系統結合鎖幅迴路,將原始信號調變,並且不必經過多存取的各種程序達到信號完整分離的效果。再經由配合適應性濾波器,估測輸出訊號,便可估計於傳輸通道中雜訊干擾的原始信號。本論文模擬結果呈現不同載波雜訊比值條件下,可以獲得最小誤差值及增加其可靠度。
Orthogonal frequency division multiplexing (OFDM) is one of the major techniques in wireless communication. Message delivery process will be damaged by channels during wireless transmission, and therefore channel estimation on received side is very important. We disregard slight carrier interferences occurring after frequency estimation and frequency offset of OFDM system have been completed, but a wrong decision-making may be brought out due to phase revolving on constellations that caused to the rest of frequency offset.
In this thesis, we adopt an orthogonal frequency division multiplexing combined amplitude-locked loop to suppress co-channel interference (CCI) according to signal characteristics of demodulation and separate in wireless channel environment. The proposed amplitude-locked loop separation system can be implemented and combined the statistic independent characteristics and mathematics algorithm to modulate for original signals. The system in this thesis does not require various process of multi-access to attain the complete signal separation effect. The output signals are also estimated and demodulated by signal spectrum cognitive operation through adaptive filter that could be obtained original signals of noise interference in transmission channel. The simulation results of this thesis are shown the minimized error value and increased the reliability for different carrier signal-to-noise ratio (SNRc).
Abstract of Chinese i
Abstract ii
Acknowledgments iii
Content iv
List of Tables vi
List of Figures vii
Abbreviations viii
Chapter 1 Introduction 01
Chapter 2 Background and Related Work 03
2.1 Phase-Locked Loop 03
2.2 Signals Analysis for the Co-channel Interference 07
2.3 Amplitude-Locked Loop 11
2.4 Cognitive Radio System 14
2.4.1 Introduction 14
2.4.2 Radio Signal Analysis 15
2.4.3 Spectrum Sensing Basic Techniques 16
2.4.3.1 Spectrum Holes 16
2.4.3.2 Primary Signal Detection 20
2.4.3.3 Energy Detection 21
2.4.3.3.1 Performance Analysis 22
2.4.3.3.2 Advanced Power Spectrum Estimation Techniques 24
2.4.3.3.2 Limitations of Energy Detection 28
Chapter 3 Orthogonal Frequency Division Multiplexing 30
3.1 Introduction 30
3.2 Multicarrier Modulation 31
3.3 The Architecture of the OFDM System 33
3.4 Mathematical Description of OFDM 36
Chapter 4 System Configuration Analysis 40
4.1 Communication Block Diagram Description 40
4.2 Transmitter (OFDM signal analysis) 41
4.3 Channel (AWGN Channel for Noise Generation) 43
Chapter 5 Simulated Result 51
5.1 Introduction 511
5.2 Simulated OFDM Modulation Signals of Co-channel interference 51
5.3 Convergence and Mean Square Error Analysis 58
Chapter 6 Conclusions 62
References 63
List of Publication 65
Biography 66
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