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系統識別號 U0002-2912201114523400
中文論文名稱 寬頻無線通訊系統之系統設計與效能評估
英文論文名稱 System design and performance evaluation for broadband wireless communication system
校院名稱 淡江大學
系所名稱(中) 電機工程學系博士班
系所名稱(英) Department of Electrical Engineering
學年度 100
學期 1
出版年 101
研究生中文姓名 林政曜
研究生英文姓名 Jheng-Yao Lin
學號 895440013
學位類別 博士
語文別 英文
口試日期 2011-11-28
論文頁數 73頁
口試委員 指導教授-詹益光
委員-曹恆偉
委員-蔡志宏
委員-許獻聰
委員-蘇木春
委員-郭景致
委員-陳巽璋
委員-李揚漢
中文關鍵字 全球互通微波存取  電機電子工程師學會 802.16m  分時多工  分頻多工  最小方差  最小均方誤差  多輸入多輸出  正交分頻多工  雷利通道  協調技術 
英文關鍵字 WiMAX (Worldwide Interoperability for Microwave Access)  IEEE 802.16m  LTE (Long Term Evolution)  TDD (Time-Division Duplex)  FDD (Frequency-Division Duplex)  LS (Least Square)  MMSE (Minimum Mean Square Error)  MIMO (Multiple-Input Multiple-Output)  OFDM (Orthogonal Frequency-Division Multiplexing)  Rayleigh channel  Coordination 
學科別分類
中文摘要 本論文共分為三個部分來討論寬頻無線通訊系統之系統設計與效能評估,第一個部分我們討論干擾的來源以及其干擾對系統效能的影響。在IEEE802.16m上行/下行控制通道中我們提出了領航訊號型式,如正方型領航訊號、直線型領航訊號;接著在通道路徑上,考慮一個行動台與多個基地台之間的干擾狀況,其中行動台對應於一個服務基地台,其他基地台對於行動台將會產生不同的干擾狀況,因此我們設計不同干擾權重的領航訊號給其他干擾的基地台使用,最後模擬得知設計後的干擾影響將低於一般無使用此設計的情況。第二個部分提出在IEEE 802.16m Resource Block裡放置領航訊號於不同位置時,同時去估測這些領航訊號的通道頻率響應,並使用這些領航訊號估測出來的通道頻率響應經由線性內插法去估測出Resource Block中其他位置的通道頻率響應。在通道頻率響應的估測中,我們使用了最小平方差以及最小均方差兩種演算法,並提出一個2x2 MIMO OFDM的系統架構模擬速度3km/hr、120km/hr、350km/hr下的位元錯誤率以及分析系統效能。第三個部分在新世代無線通訊系統有著高傳輸速度與高頻寬等優點下,針對基地台在其涵蓋範圍內,如何建立基地台之間的協調合作機制以提高頻寬使用效率;同時也探討當基地台在其涵蓋範圍內存在Femto cells或是Repeaters時,整體的系統架構,通道模型,信號的傳送及接收,Repeater的基本特性等。最後利用模擬方法以比較系統有無存在Femto cells或是Repeaters時其系統通信量及頻寬的使用情況比較。
英文摘要 In this dissertation it consists of three parts to discuss System design and performance evaluation for broadband wireless communication system.
In the first part we discuss the sources of interferences and their effect on the system performance in the transmission of pilot signals in the uplink and downlink (UL/DL) control channels. Square and line type pilot patterns are considered. Then in communication paths between an MS and various BSs, including a desired path between the MS and the desired BS and many interference paths between the MS and other BSs, then when we assign different weight to each interference pilot type the resulting system interference will be lower than the interference induced in the system in which a common and equal weight is assigned to all pilots.
In the second part of this dissertation it involves the estimation of channel impulse response; we first insert various types of pilots at pre-determined locations of the physical Resource Block in IEEE 802.16m to estimate the channel impulse responses at these locations and then use certain linear interpolation techniques to find the channel impulse responses at other locations. In the channel impulse response estimation both the Least Square (LS) and the Minimum Mean Square Error (MMSE) algorithms are considered. Various pilot structures have been proposed for 2x2 MIMO OFDM systems and the system performances in terms of bit error rate (BER) have been simulated and evaluated from the estimated channel impulse responses when an mobile user moves at speeds of 3 km/hr, 120 km/hr and 350 km/hr.
In the last part of this dissertation we consider in the next generation wireless communication system in the implementation of coordination scheme among base stations to improve the system bandwidth utilization efficiency; simultaneously we also consider the situation when it includes Femto cells or Repeaters in the base station coverage areas. We discuss the basic characteristics of Femto cells and Repeaters; explore the possible overall system structures and the possible channel models. With simulation evaluations we find the system capacity, bandwidth utilization when Femto cells are deployed or Repaeters are installed and compare these system performances with those systems without Femto cells or Repeaters included.
論文目次 TABLE OF CONTENTS
CHINESE ABSTRACT...........................................I
ENGLISH ABSTRACT..........................................II
TABLE OF CONTENTS.........................................IV
LIST OF FIGURES.........................................VIII
LIST OF TABLES............................................XI
CHAPTER 1 INTRODUCTION.....................................1
1.1 Study Motivation.......................................1
1.1.1 Inter-cell interference management in DL/UL PHY control for IEEE802.16m....................................1
1.1.2 Pilot-assisted channel estimation for multi-input multi-output (MIMO) 2x2 OFDM system........................2
1.1.3 Performance analysis with coordination among base stations for next generation communication system..........3
1.2 Organization...........................................3
CHAPTER 2 INTER-CELL INTERFERENCE MANAGEMENT IN DL/UL PHY CONTROL FOR IEEE802.16m....................................6
2.1 Introduction...........................................6
2.2 Interference Types.....................................7
2.3 PHY Control for Interference Management................8
2.3.1 DL/UL control channel for interference management...11
2.4 Interference Reducing Pilot...........................13
2.4.1 Types of interference reducing pilots...............13
2.4.2 Interference reducing pilot pattern versus interference weight.......................................14
2.4.3 Pilots assignment in TDD/FDD........................16
2.5 Simulation............................................19
2.5.1 Simulation for 7 BSs with Frequency Reuse Factor 1..19
2.5.2 Simulation for 19 BSs with Frequency Reuse Factor 19........................................................23
2.6 Summary...............................................27
CHAPTER 3 PILOT-ASSISTED CHANNEL ESTIMATION FOR MULTI-INPUT MULTI-OUTPUT (MIMO) 2x2 OFDM SYSTEM.......................28
3.1 Introduction..........................................28
3.2 System Model..........................................29
3.2.1 Arrangement of pilots...............................30
3.2.2 Interpolation method................................32
3.2.3 Channel estimation..................................33
3.3 Simulation............................................36
3.4 Summary...............................................40
CHAPTER 4 PERFORMANCE ANALYSIS WITH COORDINATION AMONG BASE STATIONS FOR NEXT GENERATION COMMUNICATION SYSTEM.........42
4.1 Introduction..........................................42
4.2 User’s Environment Cases.............................45
4.3 System Performance of Base Station....................46
4.3.1 Analysis of communication environment...............47
4.3.2 Analysis of base station bandwidth usage............49
4.4 Analysis When Certain BS-Complemented Apparatus Are Indoor Installed..........................................54
4.4.1 Repeater............................................54
4.4.1.1 Analysis of repeater..............................55
4.4.1.2 Performance analysis in coordination environment when repeaters are installed..............................56
4.4.2 Femto cell..........................................59
4.4.2.1 Analysis of femto cell............................59
4.4.2.2 Performance analysis when coordination is implemented in femto cells................................61
4.5 Summary...............................................64
CHAPTER 5 CONCLUSIONS AND FUTURE WORKS....................66
REFERENCES................................................69

LIST OF FIGURES
Figure 1.1 Organization of this dissertation………………………..………………………5
Figure 2.1 (a) Control channel structure for TDD……………………..…………………..9
Figure 2.1 (b) Control channel structure for FDD…………………………..………….....10
Figure 2.2 DL flow control for interference management………………………………..10
Figure 2.3 UL flow control for interference management………………………………..11
Figure 2.4 Cell managing information in the DL control channel………………………..12
Figure 2.5 Cell managing information in the UL control channel………………………..12
Figure 2.6 Square type pilots…..…………………………………………………………13
Figure 2.7 Line type pilots…………………..……………………………………………14
Figure 2.8 Interference weight assignments for square type pilot pattern………………..15
Figure 2.9 Interference weight assignments for line type pilot pattern…………………...16
Figure 2.10 Pilot assignments in TDD segments…………………………………………17
Figure 2.11 Pilot assignments in TDD subframes………………………………………...17
Figure 2.12 Pilot type assignments in FDD multiplexing………………………………...18
Figure 2.13 Pilot type assignments for DL and UL subframes in FDD multiplexing…….18
Figure 2.14 Cell - edge interference………………..……………………………………..19
Figure 2.15 Orthogonal pilot pattern assignments for cell 1 and cell 2 when the MS is located at the cell edge……………………………………………………19
Figure 2.16 Interference introduced from neighboring BSs to the serving BS………..…21
Figure 2.17 The MS uses the same frequency to communicate with all cluster’s BSs…...25
Figure 3.1 System structure…………………………………………………………….....30
Figure 3.2 Pilots Allocation………………………………………………………..……...31
Figure 3.3 LS & MMSE simulation result in 3km/hr………………………………….….38
Figure 3.4 LS & MMSE simulation result in 120km/hr…..………………..……..………39
Figure 3.5 LS & MMSE simulation result in 350km/hr…………………………………..40
Figure 4.1 A UE is covered within multiple base stations………………………………..43
Figure 4.2 Users environment be depicted with patterns.………………………………...46
Figure 4.3 System simulation functional block diagram………………………………….47
Figure 4.4 UEs reception statistics: Coordination scheme is implemented………………48
Figure 4.5 UEs reception statistics: Coordination scheme is not implemented…………..49
Figure 4.6 Bandwidth usage with coordination scheme implemented……………………50
Figure 4.7 Bandwidth usage without coordination scheme implemented.………………..51
Figure 4.8 Statistics of services.………………………………………………...………...53
Figure 4.9 Statistics of throughputs.…………………….………………………………...53
Figure 4.10 Repeater set up and its important parameters [37, 38]……………….....……55
Figure 4.11 Output SNR of indoor antenna……………………………………………….56
Figure 4.12 Repeaters installed environment………………..……………………………57
Figure 4.13 Users Service Quantity with and without the Installation of Repeaters……58
Figure 4.14 Throughputs with and without Installation of Repeaters………………….…58
Figure 4.15 Femto cell environments……………………………………………………..59
Figure 4.16 SNR vs. Distance in femto cell………………………………………………61
Figure 4.17 Users Connected in the DL/UL in the Base Stations and Femto Cells with and without the Deployment of Femto Cell…………………………………......63
Figure 4.18 Overall Throughputs in the Base Stations and Femto Cells with and without Deployment of Femto Cell……………………………………………….....63
Figure 4.16 System capacities with or without coordination scheme and with or without the installation of femto cells………………………………………………65

LIST OF TABLES
Table 2.1 Simulation parameters for frequency reuse factor 1…………………...………20
Table 2.2 Pilot type assignments for BSs………………………………………………....22
Table 2.3 Resulting interference levels with and without using interference reducing pilots for BSs………………………………………………………………...............23
Table 2.4 Simulation parameters for frequency reuse factor 19………………………….24
Table 2.5 Pilots assignments for different clusters…………………………………..........26
Table 2.6 Resulting interference levels with and without using interference reducing pilots for BSs…………………………………………………………………...……27
Table 3.1 Simulation Parameters…..……………………………………………………...37
Table 4.1 LTE Parameters………………………………………………………………...48
Table 4.2 Statistics of Service and Throughput…………………………………………..52
Table 4.3 Users Service Quality and Throughput when Repeaters Installed……………..57
Table 4.4 Parameters of Femto Cell [37]……………………………………………………60
Table 4.5 Users Connection Statuses when Femto Cells Implemented………………..…62
Table 4.6 Users Connection Statuses when No Femto Cells Implemented………………62
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