This book explains how the performance of modern cellular wireless networks can be evaluated by measurements and simulations With the roll-out of LTE, high data throughput is promised to be available to cellular users. In case you have ever wondered how high this throughput really is, this book is the right read for you: At first, it presents results from experimental research and simulations of the physical layer of HSDPA, WiMAX, and LTE. Next, it explains in detail how measurements on such systems need to be performed in order to achieve reproducible and repeatable results. The book further addresses how wireless links can be evaluated by means of standard-compliant link-level simulation. The major challenge in this context is their complexity when investigating complete wireless cellular networks. Consequently, it is shown how system-level simulators with a higher abstraction level can be designed such that their results still match link-level simulations. Exemplarily, the book finally presents optimizations of wireless systems over several cells. This book: * Explains how the performance of modern cellular wireless networks can be evaluated by measurements and simulations * Discusses the concept of testbeds, highlighting the challenges and expectations when building them * Explains measurement techniques, including the evaluation of the measurement quality by statistical inference techniques * Presents throughput results for HSDPA, WiMAX, and LTE * Demonstrates simulators at both, link- level and system-level * Provides system-level and link-level simulators (for WiMAX and LTE) on an accompanying website (https://www.nt.tuwien.ac.at/downloads/featured-downloads) This book is an insightful guide for researchers and engineers working in the field of mobile radio communication as well as network planning. Advanced students studying related courses will also find the book interesting.

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InhaltsangabeAbout the Authors xiii About the Contributors xv Preface xvii Acknowledgments xxiii List of Abbreviations xxv Part I CELLULAR WIRELESS STANDARDS Introduction 3 References 4 1 UMTS HighSpeed Downlink Packet Access 5 1.1 Standardization and Current Deployment of HSDPA 5 1.2 HSDPA Principles 6 1.2.1 Network Architecture 7 1.2.2 Physical Layer 9 1.2.3 MAC Layer 13 1.2.4 Radio Resource Management 14 1.2.5 Quality of Service Management 16 1.3 MIMO Enhancements of HSDPA 17 1.3.1 Physical Layer Changes for MIMO 19 1.3.2 Precoding 21 1.3.3 MAC Layer Changes for MIMO 25 1.3.4 Simplifications of the Core Network 26 References 26 2 UMTS LongTerm Evolution 29 Contributed by Josep Colom Ikuno 2.1 LTE Overview 29 2.1.1 Requirements 29 2.2 Network Architecture 31 2.3 LTE Physical Layer 33 2.3.1 LTE Frame Structure 34 2.3.2 Reference and Synchronization Symbols 36 2.3.3 MIMO Transmission 37 2.3.4 Modulation and Layer Mapping 39 2.3.5 Channel Coding 41 2.3.6 Channel Adaptive Feedback 45 2.4 MAC Layer 46 2.4.1 Hybrid Automatic Repeat Request 46 2.4.2 Scheduling 47 2.5 Physical, Transport, and Logical Channels 48 References 51 Part II TESTBEDS FOR MEASUREMENTS Introduction 57 Reference 58 3 On Building Testbeds 59 3.1 Basic Idea 60 3.2 Transmitter 61 3.3 Receiver 63 3.4 Synchronization 65 3.5 Possible Pitfalls 67 3.5.1 Digital Baseband Hardware 67 3.5.2 Tool and Component Selection 68 3.5.3 Analog RF Front Ends 69 3.5.4 Cost 70 3.5.5 Matlab(r) Code and Testbeds 70 3.6 Summary 71 References 72 4 QuasiRealTime Testbedding 75 4.1 Basic Idea 75 4.2 Problem Formulation 77 4.3 Employing the Basic Idea 78 4.4 Data Collection 80 4.4.1 More Sophisticated Sampling Techniques 81 4.4.2 Variance Reduction Techniques 84 4.4.3 Bias 85 4.4.4 Outliers 86 4.4.5 Parameter Estimation 87 4.5 Evaluating and Summarizing the Data 88 4.6 Statistical Inference 90 4.6.1 Inferring the Population Mean 90 4.6.2 Precision and Sample Size 91 4.6.3 Reproducibility and Repeatability 92 4.7 Measurement Automation 95 4.8 Dealing with Feedback and Retransmissions 96 References 97 Part III EXPERIMENTAL LINK-LEVEL EVALUATION Introduction 101 5 HSDPA Performance Measurements 103 5.1 Mathematical Model of the Physical Layer 104 5.1.1 System Model for the Channel Estimation 106 5.1.2 System Model for the Equalizer Calculation 106 5.2 Receiver 107 5.2.1 Channel Estimation 107 5.2.2 Equalizer 112 5.2.3 Further Receiver Processing 113 5.3 Quantized Precoding 113 5.4 CQI and PCI Calculation 115 5.4.1 HSPDSCH Interference 115 5.4.2 Pilot Interference 116 5.4.3 Synchronization and Control Channel Interference 116 5.4.4 Postequalization Noise and SINR 118 5.4.5 SINR to CQI Mapping 119 5.5 Achievable Mutual Information 121 5.6 Measurement Results 124 5.6.1 Alpine Scenario 125 5.6.2 Urban Scenario 128 5.6.3 Discussion of the Implementation Loss 130 5.7 Summary 131 References 132 6 HSDPA Antenna Selection Techniques 139 Contributed by Jos´e Antonio Garc´1a-Naya 6.1 Existing Research 141 6.2 Receive Antenna Selection 142 6.2.1 Antenna Selection Based on System Throughput 143 6.2.2 Hardware Aspects of Antenna Selection 143 6.3 An Exemplary Measurement and its Results 144 6.3.1 Urban Scenario 144 6.3.2 Experimental Assessment of Antenna Selection in HSDPA 145 6.3.3 Measurement Results and Discussion 147 6.4 Summary 148 References 149 7 HSDPA Antenna Spacing Measurements 153 7.1 Problem Formulation 153 7.2 Existing Research 154 7.3 Experimental Setup 155 7.4 Measurement Methodology 157 7.4.1 Inferring the Mean Scenario Throughput 157 7.4.2 Issues Requiring Special Attention 158 7.5 Measurement Results and Discussion 160 7.5.1 Equal Polarization Versus

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