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4g wireless systems seminar
Post: #26
Presented By
Dharmesh R Desai
Kaushik N Dave


Offers Compatible Transmission Technology And New Frequency Bands.
It Is Expected To Give A Comprehensive And Secure All IP Based Solution, Which Will Have Facilities Like IP Telephony, Ultra-broadband Internet Access, Gaming Services And Streamed Multimedia Facility To The User
3G VS 4G
To Avoid Frequency Selective Fading
OFDM=modulation + Multiplexing
Multi-carrier Transmission Technique
Multiple Massage Can Be Sent In Moving
A Single Radio Channel Using FDM
By Making All Sub-carrier Orthogonal To One Another It Prevent Interface Between Closely Placed Sub-carrier
Multiple Access Capability Using CDMA Or TDMA
Each Carrier Having Very Narrow Bandwidth (Few KHz)
MULTI-INPUT MULTI-OUTPUT(MIMO) 1:The Signals At Transmit Antennas End And At Receive Antennas End Are "Combined“ So That Both The Quality And The Data Rate Of The Communication Can Be Improved 2:Due To This Quality Of Service Incresses 3:Reliability Incresses
Solves The Problem Of Global Roaming By Using Radio Functionality
It Overcomes The Power , Cost , Size And Compatibility Limitation
Flexibility And Reconfigurability
It Is Impossible To Have Just One Antenna & One Low Noise Amplifier To Serve Wide Range Of Frequency Band
Complexity And Physical Size Will Be Increased
Available ADC Are Not Fast Enough
Localized Information Services
(General News , travel Services)
Communication Services
(E-mail, Video Conferencing, Fax , sms)
Organizational Services
(Calendars , address Book)
Entertainment Services
(Chat, Photo Trading , gaming & Tele-geoprocessing )
Multiple 4G Definition
Wireless System Selection
User Centric Approach
Thermal Mobility
High Data Rate
High Resolution
More Secure
Affordable Prize
In This Paper The Overall Vision Of The 4G Mobile Communication Systems Was Presented. Through Discussion It Has Been cleared That The 4G Mobile Network Will Provide Very High Data Rate.
We Also Discussed The Technologies That Are The Main Building Blocks Of 4G Which Includes OFDM, MIMO, And SDR
Post: #27
plzzz friends, i need 4g wireless systems ppt and full report as i hav seminars tomorow. plzzz mail me to this id vikranthmahamani[at] you
Post: #28
A mobile phone is an electronic device used for two-way radio telecommunication 
In telephony, 4G is the fourth generation of cellular wireless standards. It is a successor to 3G and 2G families of standards.
The existing 3G W-CDMA standard will be replaced in 4G by VSF-OFCDM and VSF-CDMA.
The 4G adoption of concatenated FEC (Forward Error Correction) will allows larger data packets to be transmitted and reduces the bit error rate.
Zero Generation Mobile Systems (0G) :
The radio telephone system preceded modern cellular mobile telephony technology (1G).
The radio telephone system contained one central antenna tower per region. The central antenna required radio phones to have a powerful transmitter, capable of transmitting up to 50 miles. The number of radio telephones per region was limited by the number of available channels.
Unlike closed radio systems, radio telephones were connected to the public telephone network and were typically mounted in cars, trucks, and briefcases.
First Generation Cellular Communication (1G):
The 1G cellular telephone system divided cities into small cells. This division allowed extensive frequency reuse across a city, allowing millions to use cell phones simultaneously.
1G (or 1-G) refers to the first-generation of wireless telephone technology.
These are the analog telecommunications standards that were introduced in the 1980s 1G cell phone technology encompassed analog standards introduced in the 1980s and continued until replaced by 2G digital cell phones.
Second Generation Cellular Communication (2G):
By the end of the year 1980 the digital telecommunication standards were developed.
These systems provided better voice quality with higher capacity which even costed low.
2G digital technologies can be divided into two standards: TDMA (Time Division Multiple Access) - GSM: Originally from Europe but used worldwide - iDEN: Proprietary network used by Nextel in the US - PDC: Used exclusively in Japan CDMA (Code Division Multiple Access) - IS-95: Commonly referred to as CDMA and used in the Americas and parts
Third Generation Cellular Communication (3G):
3G networks provide the ability to transfer voice data and non-voice data (music downloads, emails and instant messaging) over the same network simultaneously.
IMT-2000 is better known as 3G
3G provide faster communication services which include: voice ,fax internet. Broadband capabilities to support greater numbers of voice and video calls.
3G networks deliver broadband capacity and support greater numbers of voice and data customers at lower incremental costs than 2G.
Standards: - W-CDMA: Wideband Code Division Multiple Access - EVDO: Evolution-Data Optimized
Post: #29
Pick up any newspaper today and it is a safe bet that you will find an article somewhere relating to mobile communications. If it is not in the technology section it will almost certainly be in the business section and relate to the increasing share prices of operators or equipment manufacturers, or acquisitions and take-overs thereof. Such is the pervasiveness of mobile communications that it is affecting virtually everyoneâ„¢s life and has become a major political topic and a significant contributor to national gross domestic product (GDP).
Post: #30
4g wireless systems seminars



A 4G system will be able to provide a comprehensive IP solution where voice, data and streamed multimedia can be given to the users on “ Anytime Anywhere ” basis and higher data rates than the previous generations.

It is going to be launched in the year 2010.


UWB Networks
An UWB can be used at low energy levels with higher bandwidth
Bandwidth — as much as 60 megabits per second, which is 6 times faster than today’s wireless networks
Smart antennas --- Switched Beam Antennas, Adaptive Array Antennas


4G will be unification of different wireless networks, including wireless LAN technologies (e.g. IEEE 802.11), public & personal area networks (2.5G, 3G)
Software Defined Radio, Packet Layer, Implementation of Packets, Encryption, Flexibility, Anti-Virus

Problems with Existing System

Data transfer rate is slow.
All data services cannot be handled with available bandwidth.
The bandwidth is not allocated efficiently for data.
Same protocol is not being used for similar technologies
Post: #31
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Post: #32
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Post: #33
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Post: #34
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