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

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obustnness which iis up to 16µ µs in a 3.5 MMHz channnel and 8µs in a 7 MHHz channel. [50][102] – [106] Tablee 4-3 OFDMM Parameterrs Used for WiMAX 4.3.1.22. MAC LLayer 4.3.1.22.1. Three sublayers: CS, , CPS andd SS The e MAC layyer is an innterface bet tween the hhigher layerr and the PPHY. It also o processess packetss for the uppper layer called MSDDUs (MACC Service DData Units) ) and mapss them intoo MPDUss for transmmitting in PPHY.The IIEEE 802.16 standard splits the MAC-layer r into threee sublayeers, figure 22-22, conveergence subblayer (CS) , common part sublayyer (CPS) aand securityy sublayeer (SS). CS is an interfaace betweenn MAC-layeer and higheer layer prootocol such as a ATM, IPP and so on. CPS prrovides MA AC manageement, ARQQ (Automattic Repeat QQuest) scheeduling andd assembly of MAC PDUs. SS iis in chargee of encryptiion. [50][1007] 46
4.3.1.2.2. AAS (Advanced Antenna Systems) Multiantena is a good way to improve system performance. However it includes some problems such as transmit diversity, beamforming, and spatial multiplexing.. The AAS is a solution for them. [50][113][114] Transmit diversity Transmit diversity requires at least two transmitting antennas and one receiving antenna. For this type of transmission, WiMax defined STBC scheme, for example the 2x1 antenna system with Alamouti codes. The advantage of it is the same as with MIMO. The MS or end users will not have a complex set up and the cost is lower. Beamforming Beamforming has great ability to quard against interference and improve the coverage range, capacity, reliability, and received SINR. The idea is to use multiple antennas to transmit the same signal in the direction of the receiver. To operate using this method, the signal must be weighted properly for each antenna and the transmitter has to have accurate knowledge of the channel. WiMax supports beamforming for both uplink and downlink. Spatial multiplexing Spatial multiplexing means using multiple antennas to transmit multiple independent streams. When both receiver and transmitter have more than one antenna, by performing the STBC scheme, the streams can be split. The purpose of this method is to improve the data rate or capacity of the system. The increasing ratio is linear with the number of antennas. For example, a 2x2 MIMO system will double the capacity. If the MS only has one antenna, the spatial multiplexing is still supported. However, spatial multiplexing only works under good SINR conditions. 4.3.1.2.3. QoS QoS (Quality of Service) is a basic function of the WiMax MAC-layer. By using connection-oriented MAC structure, the QoS control is robust. All the uplink and downlink connections are controlled by the BS. Before transmission, a BS and a MS set up a unidirectional logical link called “connection”. This link is between two MAC layers and every connection is verified by a 16-bit connection identifier (CID). [50] To ensure the QoS, WiMax defines a scheme named “service flow”. It is a one way flow of packets that includes a special set of QoS parameters and is verified by a 32-bit service flow identifier (SFID). These parameters are used to support different kind of QoS of different tasks. 47
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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 and 54: Table 4-1 Thee Basic Datta of IEEE
Page 55 and 56: Figure 4-1 The Layer Structure of I
Page 57: codes ( (CTC) and low densityy pari
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
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WiFly used Wi-Fi to cover 60% of th
Page 113 and 114:
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
Page 119 and 120:
[117]. Yun Z.; Yuguang F., "Securit
Page 121 and 122:
Network Operations and Management S
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