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April 26th, 1999
Wireless MultimediaWireless MultimediaWireless MultimediaWireless Multimedia
Brandon McLeanBrandon McLeanDoug FawleyDoug Fawley
April 26th, 1999
Wireless MultimediaWireless Multimedia
•Overview of Wireless IndustryOverview of Wireless Industry
• Interesting ProjectsInteresting Projects• Info-Pad ProjectInfo-Pad Project• Wireless Multimedia LabWireless Multimedia Lab
April 26th, 1999
Wireless IndustryWireless Industry
Advantages of Wireless TechnologiesPortableProvides Uninterrupted ConnectionsAd-hoc Networks
DisadvantagesSlower Transfer Rates (Currently)Radio InterferenceLimited Range
April 26th, 1999
Wireless IndustryWireless Industry
Applications • Hospitals
Patient information availability
• WarehousesItem location assistance
• Office MeetingsAd-hoc networks allow sharing of notes
• Off-Site Engagement Teams Quick network setup for auditing, etc.
April 26th, 1999
InfoPad Project InfoPad Project
The GoalThe GoalTo develop the hardware, software and mobile To develop the hardware, software and mobile
network support which will allow wireless access of network support which will allow wireless access of realtime multimedia data using an inexpensive, realtime multimedia data using an inexpensive, portable terminal.portable terminal.
April 26th, 1999
InfoPad Project InfoPad Project
Features/StatisticsFeatures/StatisticsText/Graphics - X ServerText/Graphics - X Server
Resolution - 640x480x1bbp 4”LCDResolution - 640x480x1bbp 4”LCD
Audio - 8 bit uLaw, 8 KHz I/OAudio - 8 bit uLaw, 8 KHz I/O
Pen - 100 points/secPen - 100 points/sec
Video - 30 frames/sec 8-bit ColorVideo - 30 frames/sec 8-bit Color
Uses a plug-in moduleUses a plug-in module
Wireless - 242 KBPS up, 1 MBPS downWireless - 242 KBPS up, 1 MBPS down
Power Consumption - 1.5V ASICsPower Consumption - 1.5V ASICs
April 26th, 1999
InfoPad Project - How It WorksInfoPad Project - How It Works
April 26th, 1999
InfoPad Project - How It WorksInfoPad Project - How It WorksInfoPad ProjectInfoPad Project
ARM processor for system controlASICs for I/OXylinx for RF/GPIB
April 26th, 1999
InfoPad Project - How It WorksInfoPad Project - How It WorksInfoPad ProjectInfoPad Project
April 26th, 1999
DECTDECTDigital Enhanced Cordless Digital Enhanced Cordless
Telecommunications Telecommunications
April 26th, 1999
DDigital igital EEnhanced nhanced CCordless ordless
TTelecommunications - DECTelecommunications - DECT
• Wireless Communication StandardWireless Communication Standard• Indoor / OutdoorIndoor / Outdoor• residential, business and public applicationsresidential, business and public applications• not limited to telephonynot limited to telephony
• Access SystemAccess System• Backbone independentBackbone independent• Enhances network capabilitiesEnhances network capabilities
Wireless MultiMedia LaboratoryWireless MultiMedia Laboratory
April 26th, 1999
DECT OverviewDECT Overview
PSTN
Data storage
PrinterAnsweringmachine
Voice/textmail machine
Cordlessphone
Cordless phonewith mail service
Personalcomputer
Fax machine
Fax machine
Personalcomputer
Regulartelephone
DECT Home-Based System
DECTBase Station
DECT Home-Based System
April 26th, 1999
DECT Frame StructureDECT Frame Structure
A Time Division A Time Division Multiple Access/ Multiple Access/ Time Duplex Time Duplex (TDMA/TDD) (TDMA/TDD) scheme has been scheme has been chosen for DECT, chosen for DECT, where a total of 12 where a total of 12 users can share one users can share one carrier frequencycarrier frequency
April 26th, 1999
DECT - Services DECT - Services
Different Services Different Services for different for different applicationsapplications
Classes A - FClasses A - F
April 26th, 1999
Conclusions Conclusions
As the wireless industry continues to expand at an As the wireless industry continues to expand at an alarming rate, it brings along with it other facets of the alarming rate, it brings along with it other facets of the technology community, such as multimedia. Wireless technology community, such as multimedia. Wireless communication will be the standard for the next communication will be the standard for the next millenium.millenium.
ReferencesReferencesWireless MultiMedia LaboratoryWireless MultiMedia Laboratory
http://user-www.ie.cuhk.edu.hk/~wmm96/http://user-www.ie.cuhk.edu.hk/~wmm96/
InfoPad ProjectInfoPad Project
http://infopad.eecs.berkeley.edu/http://infopad.eecs.berkeley.edu/
April 26th, 1999
Q & AQ & AQ & AQ & A1. What is the bandwidth of DECT?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 2. What is the A/V codec used in the InfoPad project?project?
Audio - Audio - MSM7702 mu/A-law codec Video ---->
April 26th, 1999
Q & AQ & AQ & AQ & A
Video Codec:Video Codec:
April 26th, 1999
Q & AQ & AQ & AQ & A
Video Codec:Video Codec:
April 26th, 1999
Q & AQ & AQ & AQ & A
Video Codec:Video Codec:
