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研究生: 沈玉如
Shen, Yu-ju
論文名稱: 模糊赫普菲爾類神經網路在通訊排程問題上之應用
An Application of Fuzzy Hopfield Neural Network on Communication Scheduling Problems
指導教授: 王明習
Wang, Ming-Shi
學位類別: 博士
Doctor
系所名稱: 工學院 - 工程科學系
Department of Engineering Science
論文出版年: 2007
畢業學年度: 95
語文別: 英文
論文頁數: 105
中文關鍵詞: 廣播排程問題頻道指派問題通訊排程
外文關鍵詞: Broadcast scheduling problem, Channel assignment problem, Communication Scheduling
相關次數: 點閱:95下載:1
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  • 由於無線通訊服務的應用日益增加,但可供使用之頻譜資源卻是有限的,如何有效率的使用資源變成一個非常重要的議題。本論文將應用模糊赫普菲爾類神經網路(Fuzzy Hopfield Neural Network;FHNN)來探討通訊排程方面之應用實例。
    近年來,模糊赫普菲爾類神經網路常被用來求解最佳化問題,但尚未有其在通訊排程問題上的應用。因此,本論文將以FHNN為基礎來探索FHNN應用的潛能,我們考慮了二種不同存取方式的通訊排程問題,包括頻道指派問題(channel assignment problem)及廣播排程問題(broadcast scheduling problem)等二類通訊排程問題,此等通訊排程問題將被轉換成能量函數(Energy function)後再進行最佳化之設計工作。
    首先,本文提出以對稱距離為基礎,以建立一套群聚驗證的方法來求解頻道指派問題及廣播排程問題,此演算法對於幾何特性不同的群聚能適切地加以分群,並可快速計算出最佳頻道指派及廣播排程方式。頻道指派及廣播排程問題是屬於NP-hard 最佳化問題,若應用一般性之數學解析法來求解是相當不切實際的。本文將頻道指派及廣播排程的問題視為是分類問題,由實證結果得知,本文提出之方法能夠快速求得問題個案之最佳解,並適合運用於快速求解通訊排程問題。

    The demand for wireless communication service is increasing rapidly. But the available electromagnetic frequency spectrum is rigorously limited. How to manage the frequency resources effectively to provide the maximum service capacity becomes an important issue. This thesis will use the Fuzzy Hopfield Neural Network to probe the communication scheduling instances.
    In recent years, Fuzzy Hopfield Neural Network is frequently used to solve optimization problems. The problems are mapped to a FHNN system and an energy function corresponds to the best solutions of the system is chosen. Then the optimal design procedures of the system are conducted. Two different communication scheduling examples, including channel assignment problem and broadcast scheduling problem are considered.
    In this thesis, channel assignment problem is considered firstly. The cells on a cell phone communication system are considered as clusters and the frequency channels as objects or samples. The channel assignment problem is then as the optimal design problem of clustering the samples into fixed number of clusters. The channel assignment is an NP-hard problem. It is not realistic for solving the problem with analytic method. The second problem to be considered is the broadcast scheduling problem for packet radio networks. The BSP problem is also an NP-hard problem. Both of the above NP-hard problems are solved by the applied fuzzy Hopfield neural network. Simulation results show that the FHNN can provide an alternative approach for solving these class communication scheduling problems effectively.

    中文摘要 i Abstract ii Acknowledgement iii Table of Contents iv List of Tables vi List of Figures vii Chapter 1 1 Introduction 1 1.1 Introduction 1 1.2 Overview of the thesis 4 Chapter 2 6 Fuzzy Hopfield neural network 6 2.1 Neural network 6 2.2 Hopfield type neural network 10 2.3 Fuzzy clustering 13 2.3.1 Fuzzy sets 13 2.3.2 Fuzzy c-means (FCM) clustering 17 2.4 Fuzzy Hopfield neural network 20 2.4.1 The history 20 2.4.2 Fuzzy matrix to represent problem 22 2.4.3 Algorithm of fuzzy Hopfield 23 Chapter 3 27 Application in Channel Assignment Problem 27 3.1 Problem description 27 3.2 Relative works 29 3.3 Mapping the problem into FHNN 31 3.4 Solve the problem 36 3.5 Results and discussions 43 Chapter 4 64 Application in Broadcast Scheduling Problem 64 4.1 Problem description 64 4.2 Relative works 68 4.3 Mapping the problem into FHNN 70 4.4 Solve the problem 74 4.5.Simulation results and discussion 80 4.5.1 Evaluation indices 80 4.5.2 Simulation results 82 Chapter 5 90 Conclusions and Future works 90 5.1 Conclusions 90 5.2 Future works 92 References 93 Autobiography 105

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