CE-451 Spring 12-lec2 - CE-451 Spring 2012 Mobile...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 2 Modern Wireless Communication Systems CE-451 Spring 2012 Mobile Communications
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3/15/2012 Institute of Space Technology 2 Rapid growth in wireless systems indicates wireless communications is robust, viable voice and data transport mechanism. Next generation cellular networks are designed to facilitate high speed data communications traffic in addition to voice calls.
Background image of page 2
ITU Report 3/15/2012 Institute of Space Technology 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ICT levels around the world, by region, 2007 3/15/2012 Institute of Space Technology 4 Source: ITU World Telecommunication/ICT Indicators Database.
Background image of page 4
Second Generation (2G) Cellular Networks 3/15/2012 Institute of Space Technology 5 Use digital modulation formats and TDMA/FDD and CDMA/FDD multiple access techniques. Three TDMA standards and one CDMA standard exist: Global System Mobile (GSM)- supports 8 time slotted users for each 200 kHz radio channel, used in Europe, Asia, Australia, South America and some parts of US Interim Standard 136 (IS-136)- supports 3 time slotted users for each 30 kHz radio channel used in North America, South America and Australia Pacific Digital Cellular (PDC)- Japanese TDMA standard similar to IS-136 Interim Standard 95 Code Division Multiple Access (IS-95)- also called cdmaOne , supports up to 64 users orthogonally coded and simult. transmitted on each 1.25 MHz channel. CDMA widely deployed in North America, Japan, China, South America and Australia
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3/15/2012 Institute of Space Technology 6 Figure 2.2 Worldwide subscriber base as a function of cellular technology in late 2001.
Background image of page 6
3/15/2012 Institute of Space Technology 7
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Limits of 2G Cellular Systems 3/15/2012 Institute of Space Technology 8 2G systems are highly successful, but Capacity of the system is saturated Transmit speed is too slow (9.6 Kbps or 14.4 Kbps) to support multimedia services because they use circuit switching Symmetric transmission so not suitable for Internet traffic Main service is voice, but voice service is becoming less profitable
Background image of page 8
Evolution to 2.5G Mobile Radio Networks 3/15/2012 Institute of Space Technology 9 To support modern Internet applications, new data- centric standards are developed Can be overlaid upon existing 2G technologies-called 2.5G technology 2.5G supports: Web browsing E-mail traffic Mobile commerce Location based mobile services Also support wireless application protocol (WAP)- allows standard web pages to be viewed in a compressed format designed for small portable hand held wireless devices
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3/15/2012 Institute of Space Technology 10 Figure 2.3 Various upgrade paths for 2G technologies.
Background image of page 10
3/15/2012 Institute of Space Technology 11
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 29

CE-451 Spring 12-lec2 - CE-451 Spring 2012 Mobile...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online