A comparison of wi-fi and wimax with case studies - Florida State ...

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4.3. The Physical Layer and MAC Layer In the following section, the IEEE 802.16-2004 and IEEE 802.16e-2005 will be discussed. IEEE 802.16e-2005 inherits the fixed-BWA ability from IEEE 802.16-2004 and re-edits the PHY and MAC layer to combine fixed-BWA with mobility. According to the WiMax forum, there are four usage scenarios: nomadic, portable, simple mobility and full mobility. The applications of IEEE 802.16-2004 are to provide an air-interface for fixed and nomadic transmission, while IEEE 802.16e-2005 is to provide an air-interface for portable and mobile transmission. [50][59][94] – [96] Nomadic The user can use his/her devices with a local fixed service and reconnect to a different fixed service in another place. Portable Provide service for 3G-phones, PDA or notebook. Simple mobility Allowed the end users move in the speed up to 60 km/hr with less than 1 second interruptions. Full mobility Provide up to 120 km/hr mobility service with less than 50 ms latency and less than 1% packet loss. 4.3.1. IEEE 802.16-2004 4.3.1.1. Physical Layer There are several key technologies used in IEEE 802.16-2004 (fixed-WiMax). The fixed- WiMax is based on OFDM-PHY. It has a strong ability to protect against multipath fading and support multipath and NLOS transmission. The blueprint of the operation theory is derived from the 802.11a. The 802.16 WG changed some parameters to fit its own demands. The figure 4-1 shows the fundamental structure of IEEE 802.16 bottom layers. 42
Figure 4-1 The Layer Structure of IEEE802.16 The other key technology used in WiMax is multiple-antenna techniques. This technology is also referred to as MIMO. Through OFDM, WiMax can achieve frequency diversity and by multiple –antenna techniques, WiMax can have spatial diversity. The term spatial diversity means using two or more antennas at the receiver and/or transmitter to do transmission. During the procedure the spatial multiplexing and the STBC is required. The idea of spatial multiplexing, figure 4-2[50], is to create multiple parallel channels to carry one data stream. The advantages of MIMO are that it increases system reliability, data rate, system capacity, and coverage, and decreases the required transmit power. The theory of MIMO was introduced in section 3.4.2. [50][95] – [101] 43
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THE FLORIDA STATE UNIVERSITY COLLEG
Page 3 and 4: TABLE OF CONTENTS List of Tables…
Page 5 and 6: 5. Case study…………………
Page 7 and 8: LIST OF FIGURES Figure 2-1 The Evol
Page 9 and 10: LIST OF ABBREVIATIONS Abbreviation
Page 11 and 12: PSS Portable Subscriber Station 89
Page 13 and 14: CHAPTER ONE 1. Introduction The cel
Page 15 and 16: Table 1-1 Cont. 802.3an 2006 10GBAS
Page 17 and 18: 2.1. Introduction CHAPTER TWO 2. 3G
Page 19 and 20: 2.3. Development 3G has been in dev
Page 21 and 22: 2.5. Conclusion WAP (Wireless Appli
Page 23 and 24: IEEE 802.11n is the newest standard
Page 25 and 26: Table 3-3 Cont. 10 2.457 X Y Y Y Y
Page 27 and 28: 3.3.1.2. PLCP and PMD The physical
Page 29 and 30: Noise Codes). The most powerful con
Page 31 and 32: Figure 3-5 CCK Modulation HR-DSSS P
Page 33 and 34: other problem is inter-carrier inte
Page 35 and 36: Tab ble 3-5 OFDDM Modulaation and D
Page 37 and 38: and contains DSSS, CCK, PBCC (Packe
Page 39 and 40: 3.3.2. MAC Layer 3.3.2.1. Introduct
Page 41 and 42: Virtual channel sensing he other me
Page 43 and 44: SIFS (Short InterFrame Spacing) Fig
Page 45 and 46: Figure 3-20 WEP Frame and Operation
Page 47 and 48: 3.4.2. MIMO (Multiple-Input/Multipl
Page 49 and 50: 4.1. The background of IEEE 802.16
Page 51 and 52: The working groups of WiMax Forum a
Page 53: Table 4-1 Thee Basic Datta of IEEE
Page 57 and 58: codes ( (CTC) and low densityy pari
Page 59 and 60: 4.3.1.2.2. AAS (Advanced Antenna Sy
Page 61 and 62: Best-effort service (BE) This schem
Page 63 and 64: Encryption Figure 4-4 PKM Protocol
Page 65 and 66: 4.3.2. IEEE 802.16e-2005, the newes
Page 67 and 68: transmiission, the aadjacent cellls
Page 69 and 70: the uplink bandwidth periodically f
Page 71 and 72: Figure 4-7 Coverage and Capacity fo
Page 73 and 74: CHAPTER FIVE 5. Case study This cha
Page 75 and 76: increased bandwidth, fixed connecti
Page 77 and 78: Figure 5-3 Landis Green Figure 5-4
Page 79 and 80: Table 5-2 Xirrus XS-3700 AP Technol
Page 81 and 82: • Automatic Tx power selection
Page 83 and 84: Table 5-4 Cont. 71
Page 85 and 86: 5.1.3. Analysis The FSU wireless ne
Page 87 and 88: since the January 2006. The populat
Page 89 and 90: Table 5-5 Parameters of WLAN and Me
Page 91 and 92: Table 5-6 Features of Nortel Wirele
Page 93 and 94: • -101 dBm typical @ 1 Mbps Recei
Page 95 and 96: Operating environment specification
Page 97 and 98: uilding density, high population de
Page 99 and 100: epeater r is developping and it wil
Page 101 and 102: Figure 5-17 WiBro Features The data
Page 103 and 104: Figure 5-19 U-RAS Premium Figure 5-
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In KT’s recent report, 60% of sub
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Figure 5-21 An Example Application
Page 109 and 110:
Name Parameters Standard Table 5-10
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WiFly used Wi-Fi to cover 60% of th
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BIBLIOGRAPHY [01]. IEEE 802.11 offi
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[37]. Sun, Y.; "Bandwidth-efficient
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[88]. Mineno T.; Babji T.,"Issues a
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[117]. Yun Z.; Yuguang F., "Securit
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Network Operations and Management S
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