Wireless Multimedia

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Wireless Multimedia
Brandon McLean Doug Fawley
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Wireless Multimedia

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

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Wireless Industry
Advantages of Wireless Technologies Portable Pro
vides Uninterrupted Connections Ad-hoc
Networks Disadvantages Slower Transfer Rates
(Currently) Radio Interference Limited Range
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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.
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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.
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InfoPad Project
Features/Statistics Text/Graphics - X
Server Resolution - 640x480x1bbp 4LCD 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
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InfoPad Project - How It Works
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InfoPad Project - How It Works
InfoPad Project
ARM processor for system control ASICs for
I/O Xylinx for RF/GPIB
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InfoPad Project - How It Works
InfoPad Project
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DECT Digital Enhanced Cordless Telecommunications
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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

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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
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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
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DECT - Services
Different Services for different
applications Classes A - F
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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.i
e.cuhk.edu.hk/wmm96/ InfoPad Project http//info
pad.eecs.berkeley.edu/
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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 ----gt
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Q A
Video Codec
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Q A
Video Codec
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Q A
Video Codec