Wireless Multimedia Brandon Mc Lean Doug Fawley April

Wireless Multimedia Brandon Mc. Lean Doug Fawley April 26 th, 1999

Wireless Multimedia • Overview of Wireless Industry • Interesting Projects • Info-Pad Project • Wireless Multimedia Lab April 26 th, 1999

Wireless Industry Advantages of Wireless Technologies Portable Provides Uninterrupted Connections Ad-hoc Networks Disadvantages Slower Transfer Rates (Currently) Radio Interference Limited Range April 26 th, 1999

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. April 26 th, 1999

Info. Pad 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. April 26 th, 1999

Info. Pad Project Features/Statistics Text/Graphics - X Server Resolution - 640 x 480 x 1 bbp 4”LCD Audio - 8 bit u. Law, 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. 5 V ASICs April 26 th, 1999

Info. Pad Project - How It Works April 26 th, 1999

Info. Pad Project - How It Works ARM processor for system control ASICs for I/O Xylinx for RF/GPIB April 26 th, 1999

Info. Pad Project - How It Works April 26 th, 1999

DECT Digital Enhanced Cordless Telecommunications April 26 th, 1999

Wireless Multi. Media 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 April 26 th, 1999

DECT Overview DECT Home. Based System Fax machine Personal computer Cordless phone with mail service DECT Home. Based System DECT Base Station PSTN Cordless phone Voice/text mail machine Answering machine April 26 th, 1999 Data storage Printer Regular telephone Fax machine Personal computer

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 April 26 th, 1999

DECT - Services Different Services for different applications Classes A - F April 26 th, 1999

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 Multi. Media Laboratory http: //user-www. ie. cuhk. edu. hk/~wmm 96/ Info. Pad Project http: //infopad. eecs. berkeley. edu/ April 26 th, 1999

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 Info. Pad project? Audio - MSM 7702 mu/A-law codec Video ----> April 26 th, 1999

Q&A Video Codec: April 26 th, 1999