無線

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無線

  1. 1. 無線射頻辨識系統原理與應用報告 組員 : 李兆峻 曾鑫梓 葉偉仁 主題 :Wireless 指導老師 : 宋志揚
  2. 2. Agenda <ul><li>2010 無線網路發展趨勢 </li></ul><ul><li>802.11n and MIMO </li></ul><ul><li>Wireless S ecurity </li></ul>
  3. 3. 2010 無線網路發展趨勢 IS-95A cdma IS-136 TDMA GSM PDC 802.11b 802.11a IS-95B cdma HSCSD GPRS iMode IS-95C cdma2000 TD-SCDMA LCR-TDD E-GPRS EDGE W-CDMA FDD W-CDMA TDD 1xEV-DO Release 0 1xEV-DO Release A HSDPA FDD & TDD 1xEV-DO Release B HSUPA FDD & TDD 802.16e Mobile WiMAX LTE Rel-8 EDGE Evolution HSPA+ LTE Advanced Rel-10 802.16m WiMAX 2 802.11ac 802.11ad 802.11 n 802.11 g 802.11 h 2G 2.5G 3G 3.5G 3.9G 4G Wireless evolution 1990 - 2010
  4. 4. Wi-Fi Direct What exactly is Wi-Fi CERTIFIED Wi-Fi Direct? Wi-Fi CERTIFIED Wi-Fi Direct is an upcoming program from the Wi-Fi Alliance that defines a new way for Wi-Fi devices to work together. Wi-Fi devices will be able to make direct
  5. 5. WiMAX 2 802.16m will be significantly faster than its predecessor. WiMAX forum vice president Mohammad Shakouri says the goal is for the new WiMAX standard to deliver average downlink speeds of more than 100Mbps to users. In contrast, Sprint's initialXohm WiMAX offering, which debuted commercially in 2008, delivered downlink speeds ranging between 3.7M to 5Mbps. 300M 70M 短距離傳速度 31 平方英里 31 平方英里 基地台涵蓋率 100Mbps up 3.7M to 5Mbps 速率 802.16m 802.16 e 通信協定 Wimax 2 Wimax Item
  6. 6. DSRC
  7. 7. 802.11n and MIMO 多通道 雙層道 共乘系統
  8. 8. Wireless S ecurity 無線網路加密真的很容易破解嗎? 由於 WEP 本身存有漏洞,很容易透過收集封包,以反向運算的方式破解 原本一直被認為是安全的 WPA 、 WPA2 ,也在 2006 年宣告破解,現在可以透過字典檔攻擊的方式,從而找出無線網路的加密金鑰

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