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

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speed fixed wireless broadband service for this band. These first-generation broadband systems used towers which were several hundred feet tall and had LOS coverage up to 35 miles with high power transmitters. The users had to install outdoor antennas high enough to receive a signal and pointed toward the tower for the clear LOS path. This LOS equipment was soon considered an impediment. And because towers were difficult to set up, the service was quite limited. [50][91][92] Second-generation non-line-of-sight broadband systems The second-generation broadband systems had potential to solve the LOS problem and had the ability to provide more capacity and higher speed. This was because they used cellular architecture and advanced-signal processing technology. With these methods, the link and system performance was improved under multipath conditions. These new second-generation systems also perform well in NOLS (Non-Line of Sight) environment by using OFDM, CDMA and multiantenna processing. Some of them can even be operated without setting an antenna outside. [50] Standards-based broadband wireless systems. IEEE 802.16 standard was approved officially on December 2001 and the formal name was wireless metropolitan area network (WMAN). This first standard only focused on the10 GHz – 66 GHz band and can only do LOS transmission. In PHY-layer, it used single-carrier modulation and in the MAC-layer, it had time division multiplexing (TDM) structure which supported FDD (Frequency Division Duplexing) and TDD (Time Division Duplexing). [50] In order to maintain a competitive advantage, the IEEE 802.16 standard group developed a series of extended standards to improve WMAN performance. The IEEE 802.16 family members include IEEE 802.16, IEEE 802.16a, IEEE 802.16c, IEEE 802.16-2004, IEEE 802.16e-2005, IEEE 802.16f, IEEE 802.16g and IEEE 802.16h. [60] WiMax Forum This is a Non-Profit Organization formed in April 2001. The initial members included Intel, Fujistu, and Nokia among others. The major mission of this forum is to assure the unity and compatibility of BWA products produced by any manufacturer. In the beginning, the certification was only between IEEE 802.16 standard and ETSI HiperMAN standard (European Telecommunications Standards Institute, High Performance Metropolitan Area Network). As the technologies of the 802.16 become more mature, many industries started to pay attention to it. Therefore, more companies around the world joined and established several working groups to promote the standard. Because of this forum, WiMax (World Interoperability for Microwave Access) became the second name of IEEE 802.16. [59] 38
The working groups of WiMax Forum are CWG (Certification Working Group), TWG (Technical Working Group), RWG (Regulatory Working Group), MWG (Marketing Working Group), SPWG (Service Provider Working Group), NWG (Network Working Group) and AWG (Application Working Group) [59] 4.2. Capacity of the IEEE 802.16 family 4.2.1. IEEE 802.16 This initial standard is fixed air-interface BWA. Because it operated in a high frequency band, it can only do LOS transmission. In addition, since IEEE established this unified clause, manufacturers can produce compatible equipment by following the standard. This was a big step for realizing WMAN. [45][50] [60][93][96] 4.2.2. IEEE 802.16a This standard was approved in January 2003. The NLOS transmission was added. The IEEE 802.16 TGa extended the operation band to 2 – 11 GHz licensed and licensed-exempt band. This frequency had a longer wavelength, thus performs NLOS transmission very well. The maximum coverage was 30 miles and minimum was 6 miles. The other key technology called OFDM was also added in PHY-layer at this time. OFDM proved (in IEEE 802.11) that it was the solution for the multipath issue. These two were the major changes in PHY-layer. In the MAC-layer, the IEEE 802.16a provided QoS system the ability to support voice and video real time service. [46][50] [60] 4.2.3. IEEE 802.16c This standard is just an improved standard of the initial IEEE 802.16 standard. This one established more detailed rules of how to run a system in 10 – 66 GHz band. [47][50] [60] 4.2.4. IEEE 802.16-2004 This standard was the first practical standard of the IEEE 802.16 family. It is also known as fixed-WiMax. It integrated the previous standards and re-edited PHY and MAC-layer contents to improve the system performance and compatibility. Therefore it can support various business uses. IEEE 802.16-2004 was a fixed air-interface of BWA, and it supported 2 – 11 GHz licensed and licensed-exempt band and 10 – 66 GHz band. That meant it can do both LOS and NLOS 39
Page 1 and 2: 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: 4.1. The background of IEEE 802.16
Page 53 and 54: Table 4-1 Thee Basic Datta of IEEE
Page 55 and 56: Figure 4-1 The Layer Structure of I
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-
Page 105 and 106:
In KT’s recent report, 60% of sub
Page 107 and 108:
Figure 5-21 An Example Application
Page 109 and 110:
Name Parameters Standard Table 5-10
Page 111 and 112:
WiFly used Wi-Fi to cover 60% of th
Page 113 and 114:
BIBLIOGRAPHY [01]. IEEE 802.11 offi
Page 115 and 116:
[37]. Sun, Y.; "Bandwidth-efficient
Page 117 and 118:
[88]. Mineno T.; Babji T.,"Issues a
Page 119 and 120:
[117]. Yun Z.; Yuguang F., "Securit
Page 121 and 122:
Network Operations and Management S
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