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計概報告家妃.Ppt

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Transcript

  • 1. Wireless Personal Area Network , WPAN 工系 林妃 教 家
  • 2. NB: Wireless Communications Center In the near feature, no matter where your are, you could use wireless communications via NB.
  • 3. Wireless Technology Used in NB Nowadays, we could only use wireless communications via NB within limit distance . WLAN WPAN - 802.11b - Bluetooth - 802.11a - Infrared rays - 802.11g < 50 m <5m
  • 4. Wireless Personal Area Network WPAN  Bluetooth  ZigBee  WiMax GSM, WAP, GRPS, PHS , UWB
  • 5. Infrared ray  Difused  Directed
  • 6. Bluetooth (1/2) Bluetooth is an emerging technology for short-range, low power wireless applications. The original purpose of Bluetooth proposed by Ericsson, IBM, Nokia, Intel, and Toshiba in February 1998. is used to replace cables with RF transmission and apply to cellular phones, PDAs, digital Cameras
  • 7. BlueTooth (2/2) BlueTooth is an open standard version of WPAN (Wireless Personal Area Network). Identical to IEEE 802.11b, BlueTooth v1.x adopts 2.4 GHz as its operation frequency band but it utilizes FHSS (Frequency Hopping Spread Spectrum) as its modulation scheme. However, compared with IEEE 802.11, BlueTooth has different market partition The hopping frequency of BlueTooth is 1600 hops per second, the frequency spectrum is normally divided into 79 channels with 1 MHz channel spacing per channel.
  • 8. ZigBee ZigBee deals with low data rate but very long battery life (months or even years) and very low complexity.The first edition of the 802.15.4 standard was released in May 2003. In March 2004 ZigBee has two PHY layers that operate in two separate frequency ranges: 868/915 MHz and 2.4GHz.
  • 9. ZigBee applications
  • 10. ~Thanks for Your Time~