【資料名稱】：Performance Evaluation of WiMAX

【資料作者】：Lic. Tech. Boris Makarevitch

【資料日期】：June 2007

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

Thesis submitted in partial fulfillment of the requirements for the degree of
Master of Science in Technology, Espoo, June 2007

Fixed Broadband Wireless Access (BWA) is a promising technology which can offer high speed voice, video and data service up to thecustomer end. Due to the absence of any standard specification, earlier
BWA systems were based on proprietary standard. IEEE 802.16 WirelessMAN standard specifies a Medium Access Control (MAC) layer and a set of PHY layers to provide fixed and mobile Broadband Wireless
Access (BWA) in broad range of frequencies. The WiMAX forum has adopted IEEE 802.16 OFDM PHY layer for the equipment manufacturer due to its robust performance in multipath environment. The thesis
investigates the simulation performance of IEEE 802.16 OFDM PHY layer. The Stanford University Interim (SUI) channel models are selected for the wireless channel in the simulation. The evaluation was done in
simulation developed in MATLAB. Perfect channel estimation is assumed.





Table of Contents
Acknowledgements ........................................................................................................................iii
List of Figures..................................................................................................................................vi
List of Tables..................................................................................................................................viii
List of Abbreviations ......................................................................................................................ix
List of Symbols................................................................................................................................xi
Chapter 1: Introduction ..................................................................................................................1
1.1 Motivation...............................................................................................................................1
1.2 Objective..................................................................................................................................2
1.2 Structure of the thesis ..........................................................................................................3
Chapter 2: IEEE802.16: Evolution and Architecture.............................................................4
2.1 Evolution of IEEE family of standard for BWA ...................................................................4
2.1.1 IEEE 802.162001..............................................................................................................
5
2.1.2 IEEE 8020.16a2003
.........................................................................................................6
2.1.4 IEEE 802.162004..............................................................................................................
7
2.1.5 IEEE 802.16e2005............................................................................................................
7
2.2 IEEE 802.16 Protocol Layers .................................................................................................8
2.3 Network Architecture and Deployment Topology: .............................................................9
2.5 WiMAX forum and adaptation of IEEE 802.16.................................................................12
Chapter 3: IEEE 802.16 Physical Layer ...................................................................................14
3.1 IEEE 802.16 PHY Layer:.......................................................................................................14
3.1.1 Supported Band of Frequency ......................................................................................14
3.2 IEEE 802.16 PHY interface variants...................................................................................15
3.2.1 WirelessMANSC
™ .........................................................................................................15
3.2.3 WirelessMANSCa
™ .......................................................................................................16
3.2.3 WirelessMANOFDM
™ ...................................................................................................16
3.2.4 WirelessMANOFDMA
™ :...............................................................................................16
3.2.5 WirelessHUMAN™ : .........................................................................................................17
3.4 WirelessMAN OFDM PHY Layer.........................................................................................17
3.4.1 Flexible Channel Bandwidth: .........................................................................................18
3.4.2 Robust Error Control Mechanism.................................................................................18
3.4.3 Adaptive Modulation and Coding..................................................................................18
3.4.4 Adaptive Antenna System..............................................................................................19
3.4.5 Transmit Diversity:............................................................................................................19
3.3 OFDM.......................................................................................................................................20
3.3.1 OFDM BASIC:...................................................................................................................20
3.3.2 OFDM SYSTEM IMPLEMENTATION .........................................................................22
3.3.3 CYCLIC PREFIX ADDITION .........................................................................................23
3.3.4 OFDM SYSTEM DESIGN CONSIDERATIONS........................................................24
3.3.5 BENEFITS AND DRAWBACKS of OFDM: ................................................................25
3.3.6 APPLICATION ..................................................................................................................26
Chapter 4: Simulation Model ......................................................................................................27
4.1 OFDM Symbol Parameter.....................................................................................................27
v
4.2 Physical Layer Setup .............................................................................................................28
4.2.1 Scrambler..........................................................................................................................29
4.2.2 ReedSolomon
Encoder..................................................................................................30
4.2.3 Convolutional Encoder ....................................................................................................30
4.2.4 Interleaver ..........................................................................................................................32
4.2.5 Constalletion Mapper.......................................................................................................32
4.2.6 IFFT ....................................................................................................................................33
4.2.7 Cyclic Prefix Insertion:.....................................................................................................33
4.3 Channel Model: .......................................................................................................................33
4.3.1 Stanford University Interim (SUI) Channel Models...................................................35
4.3.2 SUI channel models Implementation:..........................................................................39
Chapter 5: Simulation Results ...................................................................................................41
5.1 The Simulator..........................................................................................................................41
5.2 Physical layer performance results.....................................................................................42
5.2.1 Scatter Plots ......................................................................................................................42
5.2.2 BER Plots ...........................................................................................................................52
5.2.3 BLER Plots.........................................................................................................................55
5.2.4 Effect of Forward Error Correction................................................................................58
5.2.5 Effect of ReedSolomon
Encoding ...............................................................................62
5.2.6 Effect of Bit interleaver ....................................................................................................66
5.2.7 Spectral Efficiency............................................................................................................71
Chapter 6: Conclusion and Future Work................................................................................73
6.1Conclusion ................................................................................................................................73
6.2 Future Works...........................................................................................................................74
Reference .........................................................................................................................................75
Appendix...........................................................................................................................................78