Post on 26-May-2015
Presented By:
Anupama
Shelly
Sonia
MCA-2
Introduction to wireless communication
Our ultimate goal is to communicate with any type of information with anyone, at anytime, from anywhere. This is possible with the aid of WIRELESS TECHNOLOGY
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Types of wireless Communication
• Cellular Networks
• Wireless local area network
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Cellular Networks
Evolved from mobile telephone as voice conversation and communication tools for private and business uses
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Wireless Local Area Network
Emerged from computer network. It helps business user to expand their service areas by using LAN (faster data transport) User
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Evolution from 1g to 4g system
• 1g Wireless System :Developed in 1980s and completed in early 1990’s
• 2g Wireless System :The 2G phase began in the 1990s and much of this technology is still in use.
• 3g Wireless System :It was developed in the late 1990s until present day,Japan is the first country having introduced 3G nationally
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3G WIRELESS SYSTEM
• Services include: – Global roaming– Superior voice quality and video conference– Information for web surfing, music, news,
corporate intranet, transportation service etc– Transmission speeds from 125kbps to 2Mbps
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Issues on 3G wireless system
• High input fees for the 3G service licenses
• Inefficient to meet needs of future high-performance
• Multiple standards for 3G
• Require wider bandwidth
• Lack of coverage because it is still new service
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4G wireless system
4G technologies are sometimes referred to by the acronym "MAGIC," which stands for Mobile multimedia, Anytime/any-where, Global mobility support, Integrated wireless and Customized personal service.
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Current Technology
• TDMA :Time Division Multiple Access, is a technique for dividing the time domain up into sub channels for use by multiple devices.
• CDMA :Code Division Multiple Access, allows every device in a cell to transmit over the entire bandwidth at all times.
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4G Hardware
• Ultra Wide Band Networks :Ultra Wideband technology, or UWB, is an advanced transmission technology that can be used in the implementation of a 4G network.
• Smart Antennas :: Multiple “smart antennas” can be employed to help find, tune, and turn up signal information
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General 4G Services and 4G Applications
• Localized/Personalized Information
• Organizational services
• Communications services and applications
• Entertainment services
• Mobile commerce (M-Commerce )User
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Features of 4G Wireless Systems
• Support interactive multimedia
• User friendliness
• High speed, high capacity and low cost per bit
• Higher band widths
• Terminal Heterogeneity
• Network Heterogeneity
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User and Industry Expectations
• Wireless users can be categorized into generalized segments :– The Age segment – The Internet Usage segment – The Mobile Professional segment
Comparison between 3g and 4g
Major Requirement 3g 4g
Speed 384 Kbps to 2 Mbps 20 to 100 Mbps
Frequency Band Dependent on country Higher frequency bands (2-8 GHz)
Bandwidth 5-20 MHz 100 MHz (or more)
Switching Design Basis
All digital with packetized voice
Access Technologies
Circuit and Packet
W-CDMA OFDM and MC-CDMA
Conclusion
• 4G will be a Convergence Platform providing clear advantages in terms of Coverage, Bandwidth, Power Consumption, variety of Services, ranging from Pop-Up advertisements to Location-Based services and IP Data casting ones.
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