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Wireless Multimedia

Wireless Multimedia. Brandon McLean Doug Fawley. Wireless Multimedia. Overview of Wireless Industry Interesting Projects Info-Pad Project Wireless Multimedia Lab. Wireless Industry. Advantages of Wireless Technologies Portable Provides Uninterrupted Connections Ad-hoc Networks

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Wireless Multimedia

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  1. Wireless Multimedia Brandon McLean Doug Fawley

  2. Wireless Multimedia • Overview of Wireless Industry • Interesting Projects • Info-Pad Project • Wireless Multimedia Lab

  3. Wireless Industry Advantages of Wireless Technologies Portable Provides Uninterrupted Connections Ad-hoc Networks Disadvantages Slower Transfer Rates (Currently) Radio Interference Limited Range

  4. Wireless Industry Applications • Hospitals Patient information availability • Warehouses Item location assistance • Office Meetings Ad-hoc networks allow sharing of notes • Off-Site Engagement Teams Quick network setup for auditing, etc.

  5. InfoPad Project The Goal To develop the hardware, software and mobile network support which will allow wireless access of realtime multimedia data using an inexpensive, portable terminal.

  6. InfoPad Project Features/Statistics Text/Graphics - X Server Resolution - 640x480x1bbp 4”LCD Audio - 8 bit uLaw, 8 KHz I/O Pen - 100 points/sec Video - 30 frames/sec 8-bit Color Uses a plug-in module Wireless - 242 KBPS up, 1 MBPS down Power Consumption - 1.5V ASICs

  7. InfoPad Project - How It Works

  8. InfoPad Project - How It Works InfoPad Project ARM processor for system control ASICs for I/O Xylinx for RF/GPIB

  9. InfoPad Project - How It Works InfoPad Project

  10. DECT Digital Enhanced Cordless Telecommunications

  11. Wireless MultiMedia Laboratory Digital Enhanced Cordless Telecommunications - DECT • Wireless Communication Standard • Indoor / Outdoor • residential, business and public applications • not limited to telephony • Access System • Backbone independent • Enhances network capabilities

  12. DECT Home- Based System DECT Overview Fax machine Personal computer DECT Home- Based System Cordless phone with mail service DECT Base Station PSTN Cordless phone Data storage Voice/text mail machine Fax machine Regular telephone Answering machine Printer Personal computer

  13. DECT Frame Structure A Time Division Multiple Access/ Time Duplex (TDMA/TDD) scheme has been chosen for DECT, where a total of 12 users can share one carrier frequency

  14. DECT - Services Different Services for different applications Classes A - F

  15. Conclusions As the wireless industry continues to expand at an alarming rate, it brings along with it other facets of the technology community, such as multimedia. Wireless communication will be the standard for the next millenium. References Wireless MultiMedia Laboratory http://user-www.ie.cuhk.edu.hk/~wmm96/ InfoPad Project http://infopad.eecs.berkeley.edu/

  16. Q & A 1. What is the bandwidth of DECT? The radio frequency band allocated to DECT is 1880-1900 MHz. The entire 20 MHz need not be employed by DECT-based systems. The DECT standard uses TDMA. There are 10 frequencies of operation in the 20 MHz band, with a spacing of 1.728 MHz. The bit rate is 1.152 Mbps. 2. What is the A/V codec used in the InfoPad project? Audio - MSM7702 mu/A-law codec Video ---->

  17. Q & A Video Codec:

  18. Q & A Video Codec:

  19. Q & A Video Codec:

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