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博碩士論文 etd-0831105-095016 詳細資訊
Title page for etd-0831105-095016
論文名稱
Title
線性限制適應性演算法在非頻變寬頻陣列波束型成器之應用
Frequency-Invariant Broadband Antenna Array Beamformer with Linearly Constrained Adaptation Algorithms
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
69
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
2005-07-18
繳交日期
Date of Submission
2005-08-31
關鍵字
Keywords
波束空間、滑動視窗遞回最小平方演算法、適應性濾波器、微分限制、頻率不變、移動干擾
Derivative Constraint, Sliding Window Recursive Least Squares, Frequency Invariant, Adaptive Filter, Beamspace, Moving Jammer
統計
Statistics
本論文已被瀏覽 5692 次,被下載 10
The thesis/dissertation has been browsed 5692 times, has been downloaded 10 times.
中文摘要
在空間上的處理上,是利用到智慧型天線之空間分集的觀念,不用額外地考慮頻率分集,將適應性天線應用於此系統,可以增加系統的容量、及效能。陣列波束型成器本身是一個處理器,連同陣列感測器能夠提供多方面形式的空間濾波,它可以設計在想要訊號的方向形成主波束,且在其他方向的干擾形成零強度。適應性陣列波束型成器一般可分為寬頻陣列架構和窄頻陣列架構;為了有效消除寬頻干擾,我們利用寬頻陣列架構來處理寬頻訊號,在寬頻適應性陣列波束型成器中,許多建構在線性限制的適應性演算法廣泛地被使用。在本論文中,我們利用波束空間的方法來設計寬頻陣列波束型成器,並以限制性滑動性視窗遞迴式演算法來執行,會具有頻率不變的特性及有效消除寬頻移動干擾,另外,微分限制的方法用在限制性滑動性視窗遞迴式演算法能夠對抗想要訊號在方位上的指向錯誤效應。由電腦模擬可以得知我們所使用的方法比傳統的方式對於移動干擾更具強健性,並且可用於現存的無線寬頻通訊系統中,以提供高速率傳輸的通訊服務,而達到預期的效能。
Abstract
Spatial processing that exploits the diversity provided by smart antenna arrays, in which the adaptive beamformer is employed, is another alternative to increase the efficiency of wireless system capacity and performance without allocating additional frequency spectrum. An array beamformer is a processor used in conjunction with an array of sensors to provide a versatile form of spatial filtering; it can be designed to form main lobe in direction corresponding to the desired source and nulling the interferences from others direction. They are two types of adaptive array beamformer structures, viz., broadband and narrowband array structures. To deal with the wideband desired signal or interferences the broadband array beamformer is preferred. For broadband interferences suppression, many adaptive array beamforming algorithms, based on the linearly constrained have been extensively used. In this thesis, the beamspace approach for designing the broadband antenna array beamformer, with frequency invariant character, is devised and implemented with the sliding window linearly constrained RLS (SW-LC-RLS) algorithm, to deal with the broadband moving jammers (or interferences) suppression. Also, to combat the pointing error effect of desired user’s look direction, the derivative constraint is adopted for devising the derivative SW-LC-RLS beamforming algorithm for broadband moving jammers suppression. Computer simulation results confirmed that the proposed scheme is more robust against the moving jammers over the conventional algorithms. It can be applied to the existing wideband wireless communications systems to achieve desired performance for supporting high data rate communication services.
目次 Table of Contents
Chapter 1 Introduction

Chapter 2 Smart Antenna Array Beamformers

Chapter 3 Adaptive Linearly Constrained Array Beamforming Algorithm with Beamspace Approach

Chapter 4 Conclusions
參考文獻 References
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