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Short Distance Wireless Communication

Short Distance Wireless Communication

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Short Distance Wireless Communication

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  1. Short DistanceWireless Communication

  2. Team 5 Thomas French Jordan Harris Mike Symanow Luseane Tangataevaha

  3. Wireless Communication • Platforms: • Wi-Fi • Bluetooth • Zigbee • WWan • Concepts: • Advantages / Disadvantages • Applications

  4. Wi-Fi • IEEE 802.11g • Data Rate: Maximum 54 Mbps • Product Range: up to 100 meters • Operating Frequency: 2.4 GHz • Security: Password Encryption

  5. Wi-Fi • How It works: • Data Transmission/Acquisition • Wired Ethernet connection • OFDM • Closely spaced orthogonal sub-carriers. • Reduction of attenuation with high frequencies. • Facilitates single-frequency networking. • Broadcasting • Decoding of the Signal • Wireless Card

  6. Wi-Fi Applications • Modem for internet • Cable • DSL • Device to device communication.

  7. Wi-Fi • Advantages: • Comparatively higher data transfer rates than other similar technologies. • Low infrastructure • Wide availability • Disadvantages: • Cost • Limited range: Restricted to “Hot Spots”

  8. Bluetooth • Open Wireless Protocol, WPAN standard • Operates ISM band at 2.4-2.4835 GHz • Uses radio technology called frequency- hopping spread spectrum • Modulation - Gaussian Frequency-Shift Key Modulation

  9. Bluetooth • Frequency- Hopping Spread Spectrum • Chunks of data transmitted • Spread-spectrum signals are highly resistant to narrowband interference • Difficult to intercept • Transmissions share a frequency band with minimal interference

  10. Bluetooth http://en.wikipedia.org/wiki/Bluetooth • Data rate up to 1Mb/s – 3 Mb/s • Use in mobile phones, laptops, telephones, printers, GPS, video game consoles • Bluetooth USB dongle – must use if computer is not Bluetooth enabled

  11. Advantages/Disadvantages • Advantages: • Wireless, Inexpensive, Automatic • Low energy and power consumption • Disadvantages: • Security • Viruses over the years • Bluejacking • Health Concerns (same as mobile phones)

  12. ZigBee • High-level communication protocol • Aim low • The Name • Zig-zagging of bees from flower to flower • Analogous to mesh networking

  13. ZigBee Applications Source: http://www.zigbee.org/imwp/idms/popups/pop_download.asp?ContentID=7092

  14. ZigBeeAdvantages • Extremely low power • Simple sensor: 1 AA = >5 years • Sleep modes allow decades of use • Low response time • Low cost

  15. ZigBee Disadvantages • Low data rate • Bluetooth = 3Mbps; ZigBee = 250kbps • Low range • <35m on average • Geared towards very specific applications • “Aim low”

  16. Wireless Wide Area Network (WWAN) • Wireless communication technology for data exchange over long distances. • ~7 miles maximum range. • Uses cell phone networks for data exchange.

  17. Applications • Mobile Internet Access • Laptop Computers • Hand Held Devices (Cell Phones) • Net Books

  18. Operation • Cell Phone network for data transfer • WiMAX communication. • IEEE 802.16 communication standard • Allows connection continuity between service areas

  19. Performance • Current networks are typically 3G Cell • Typically 2.5 GHz, 70 Mb/s • Actual data transfer rates depend on range and strength of signal and data formatting. • Limitations • Network availability • Signal strength

  20. Future 4G Cell Networks Higher network capacity 100Mbit/s to 1Gbit/s data transfer rates Smoother handoff Operational by ~2010 Satelite Communication Global internet access High transfer rates

  21. Summary

  22. QUESTIONS?