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研究生:蔡崇洲
研究生(外文):Tsai Churng-Jou
論文名稱:共性干擾源環境下之陣列波束構成器
論文名稱(外文):Array Beamformers in the Presence of Correlated Interferences.
指導教授:楊家輝楊家輝引用關係
指導教授(外文):Yang Jar-Ferr
學位類別:博士
校院名稱:國立成功大學
系所名稱:電機工程研究所
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:1993
畢業學年度:82
語文別:英文
論文頁數:127
中文關鍵詞:共性共性訊號子空間轉換波束構成器
外文關鍵詞:CoherentCoherent Signal-Subspace Transformation Beamformers
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  本論文之研究主題是分析共性干擾源環境下之窄頻及寬頻共性訊號子
空間轉換波束構成器的性能,基於以上之性能分析,波束構成器之接收性
能改進或有效干擾均可由理論上及實際上加以實現。本論文大體可分為三
部份,在第一部份中,本論文採用一個有效功率的性能量測來分析窄頻波
束構成器之性能,對於此一性能量測隨著不同的訊號源功率、相關性及資
料量而改變的情形也將加以說明,此一性能量測亦可用來估量波束構成器
加入均化技術後之性能改進。第二部份是提出對空間均化技術處理具有限
頻寬之多通路訊號的性能分析,此一技術的解共性能力和訊號源的分數頻
寬、入射角度和延遲量有關,有效均化的次陣列個數和距離也被提出。第
三部份是對共性訊號子空間轉換波束構成器做三方面之性能分析,藉由提
出一個新的聚焦性能量測,可推導共共性訊號子空間轉換波束構成器之最
佳聚焦矩陣和一些有趣的結果。最後,本論文提出一個自動聚焦的共性訊
號子空間轉換波束構成器,它可以適應性的調整最佳加權值而不需要去初
估入射角度,此一適應性的共性訊號子空間轉換波束構成器不僅降低計算
量,而且增進了消除共性及非共性干擾源的能力。
In this thesis, narrowband beamformers and wideband coherent
signal-subspace transformation (CST) beamformers in the
presence of correlated interferences are analyzed. This thesis
can be divided into three parts. In the first part,the optimal
performance of the narrowband beamformer are analyzed by using
a performance measure which is derived from the concept of
effective beamformer output power. The performance measure
varying with the power of sources, the correlation coefficients
between sources, the number of data snapshots, etc. are
addressed. On the contrary, the theoretical design of the
effective jamming to the narrowband beamforming system is
derived and discussed. The second part addresses the
performance analysis of the spatial smoothing technique in the
case of real band-limited multipath signals. The decorrelation
performance of the spatial smoothing technique is found to be
dependent on the fractional bandwidth, the arriving angles, and
the dealy time of sources. The last part provides the
performance analysis of the CST beamformer in two different
scenarios.By proposing a new focusing performance measure, the
optimal focusing matrix for the CST beamformer accompanied with
some interesting results is derived. Finally, an auto-focusing
CST beamformer is proposed to adaptively update the optimal
weights without involving any preliminary bearing estimations.
中文摘要
英文摘要
ACKNOWLEDGE
TABLE OF CONTENTS
LIST OF ILLUSTRATIONS
LIST OF TABLES
1. INTRODUCTION
1.1 DATA MODEL FOR ARRAY BEAMFORMING PROCESSING
1.2 PRIOR WORKS
1.3 SIGNAL CANCELLATION PHENOMENON
1.4 THESIS OUTLINE
2. PERFORMANCE ANALYSES OF BEAMFORMERS USING EFFECTIVE SINR
2.1 INTRODUCTION
2.2 PERFORMANCE ANALYSIS OF THE OPTIMAL BEAMFORMER
2.3 EFFECTIVE OUIPUT POWERS AND PERFORMANCE MEASURE
2.4 SINRe AND ARRAY PARAMETERS
3. THEORETICAL DESIGN OF EFFECTIVE JAMMING TO NARROWBAND BEAMFORMERS
3.1 INTRODUCTION
3.2 ARRAY SIGNAL MODEL
3.3 SELECTABLE CORRELATION COEFFICIENTS
3.4 EFFECTIVE JAMMING SYSTEMS
4. DECORRELATION PERFORMANCE ANALYSIS OF SPATIAL SMOOTHING TECHNIQUES
4.1 INTRODUCTION
4.2 MODELLING OF ARRAY SIGNAL PROCESSING
4.3 FURTHER ANALYSIS OF DECORRELATION PERFORMANCE OF SPATIAL SMOOTHING
4.4 SIMULATION RESULTS
5. PERFORMANCE ANALYSIS OF COHERENT SIGNAL-SUBSPACE TRANSFORMATION BEAMFORMERS
5.1 INTRODUCTION
5.2 MODEL FORMULATION OF THE CST-MVDR BEAMFORMER
5.3 FOCUSING SINR PERFORMANCE MEASURE
5.4 FURTHER PERFORMANCE ANALYSIS OF THE CST BEAMFORMER
6. ADAPTIVE COHERENT SIGNAL-SUBSPACE TRANSFORMATION BEAMFORMERS
6.1 INTRODUCTION
6.2 WIDEBANDCST BEAMFORMING FORMULATIONS
6.3 THE AUTO-FOCUSING TECHNIQUE
6.4 SIMULATION RESULTS
7. CONCLUSIONS
APPENDICES
REFERENCES
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