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

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difficultt to be hhacked; theerefore, it is populaar for somme industriies. To immprove thee competitiveness off 802.11a, rresearchers invent a tripple frequenncies chip foor a/b/g. Someone whoo works iin the officee with 802.111a can then n walk out to a public place and gget on the Innternet withh 802.11bb/g. The neew productss make cerrtain that thhese three sstandards caan be opera ated in onee buildingg. [7] – [9] [14] 3.3. TThe Physiccal Layerr and MA AC Layer 3.3.1. The Phyysical Layyer 3.3.1.11. Introduuction The e Physical llayer is the first layer oof the OSI ( (Open Systeem Interconnnection) mmodel, figuree 3-1. It is at the boottom of thhe model. TThis layer iis responsibble for deciding the tr ransmissionn methodd, bandwidthh, mediums, bit synchronization, mmodulation and so on. MMost physic cal set up iss completted in this layer. It is the first layer of the nnetwork strructure. It pprovides a mechanical m , electrical and alsoo proceduraal flattop be etween the transmissioon mediumm. The mosst importantt missionn of the phyysical layerr is the flueency of dataa streams. TThis sectionn is going to t introducee several technologiees used for 802.11 prottocols and wwill discuss how they wwork in this layer. FFigure 3-1 OOSI Model 14
3.3.1.2. PLCP and PMD The physical layer contains two sublayers, PLCP (Physical Layer Convergence Protocol) and PMD (Physical Medium Dependent), figure 3-2. These two layers communicate with each other by SAP (Service Access Point). Different transmission methods will add different preambles and headers to their own PLCP and PMD. [04] – [07][09][21] PLCP The function of PLCP is to prepare MPDU’s (MAC Protocol Data Units), also called PSDU (PLCP Service Data Unit), for communicating with the MAC layer. It transfers the incoming frames from mediums to the MAC layer. The PLCP is located between the PMD sublayer and the MAC layer so that it can help PMD transmit frames without communicating with the MAC layer in advance. For this purpose, PLCP will map the MPDUs into PMD frames before transmission. MPDU’s contain a unique preamble and header in the physical layer, which includes the information of PHY transmitters and receivers. These kind of composited frames are called PPDU (PLCP Protocol Data Unit). PMD This sublayer is right under the PLCP. It controls the transmission and reception of the physical layer data units from stations via mediums. PMD is the interface of a layer and a physical medium. It connects with wireless mediums (RF, … etc.) directly. Frames are also modulated and demodulated in this sublayer. 3.3.1.3. CS/CCA Figure 3-2 802.11 PLCP, PMD and MAC Structure No matter what kind of network it is, there is one problem in common. That is how to improve effective transmission. For solving this problem, 802.11 applied CS/CCA technologies during transmission process. CS/CCA is the initial of Carrier Sense/Clear Channel Assessment. 15
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: Table 3-3 Cont. 10 2.457 X Y Y Y Y
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 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
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• 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
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Table 5-5 Parameters of WLAN and Me
Page 91 and 92:
Table 5-6 Features of Nortel Wirele
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• -101 dBm typical @ 1 Mbps Recei
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Operating environment specification
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uilding density, high population de
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epeater r is developping and it wil
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Figure 5-17 WiBro Features The data
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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
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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
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[117]. Yun Z.; Yuguang F., "Securit
Page 121 and 122:
Network Operations and Management S
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