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

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Figure 3-9 OFDM Modem 3.3.1.5.3. The IEEE 802.11a’s OFDM and its PLCP and PMD OFDM is a good transmission technology, but TGa did not use the full version. They modified their own one. When building an OFDM network, there are some important parameters which are bandwidth, delay and bit rate. The bandwidth is fixed for 802.11a. When considering delay, it is necessary to have guard time. Usually the ratio of guard time and delay is two to four times as big. And the symbol time is five times of the guard time. Thus TGa chose 800 ns as guard time and 4 µs as symbol time. The bandwidth of an operation band is 20 MHz and the theoretical highest speed is 54 Mbps. Higher capacity could have higher throughput. However it will decrease the number of operation channels. Therefore, how to achieve a reasonable balance is an important design issue. [17][29] - [31][39] The modulation technology for OFDM is shown in Table 3-4[17]. To reach a higher speed, TGa has not only changed the transmission method, but also used another modulation technology QAM (Quadrature Amplitude Modulation). Figure 3-10[55] For preventing the BER (Bit Error Rate) increase which caused by certain channel’s signal fading, the error correction code is added to the all sub-channels. The error correction code is called “Convolutional Code”, and this kind of OFDM sometimes is named COFDM (Coded OFDM). Here is the related research: [36][39][40] – [42] 22
Tab ble 3-5 OFDDM Modulaation and Daata Rate Figure 3-10 Constellaations Diagrram The e OFDM-PLLCP structuure is shownn in Figure 3-11[21]. TThe preamblle contains 12 symbolss and is uused to synnchronize with w a receivver. The duration time of an OFDDM preamb ble is 16 µs. There aare two parrts of the prreamble; shhort trainingg sequence (the first tten symbols s) and longg trainingg sequence ( (the rest tw wo symbols) ). The short one is usedd to create AAGC (Auto omatic Gain n Controll), timing annd initial freequency offfset estimatiion of the carrier signaal. The long one is used d 23
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: other problem is inter-carrier inte
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
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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