1. 4G-WIRELESS NETWORKS PREPARED BY: PARTH LATHIGARA(07BEC037)
KRISHNA MEVAVALA(07BEC047)
GUIDED BY:
DR D.K.KOTHARI

2. Evolution of Wireless Networks:2

3. 3 REVOLUTION in Wireless Communication First implemented In 1980’s
Mobility In Tele Communication 3

4. Limitations: Subscriber Capacity Security Spectrum Utilization
Infrastructure Changes 4

5. Revolutionary Step Toward DIGITAL
Implemented in 1990’s
Many advantages Over 1G
Still in Market 5

6. Enhancement Over 1G: Increased “capacity” Reduced capital “cost”
Reduced Cellular “Fraud”
Improved Features
SMS
Voice & Data Transmission 6

7. 7 First Implemented in 2000 Provides higher data rates
Offers always-on internet and
Typically uses GPRS
Bridge between 2 G & 3 G 7

8. Enhancement Over 2G: High speed packet-data service(144.4kbps)
Uses existing radio spectrum 8

9. `
What 3G & 4G Can Do?

10. Consisting of Packet Data Devices
Implemented in 2005
Consisting of Packet Data Devices
Higher Speed than 2.5G & 2.75G
Video Conferencing
Internet Streaming 10

11. Standards:- UMTS: TD-CDMA: Combination of TDMA,CDMA & FDMA.
High data rate-up to 2Mbps
Deliver information directly to users and provide them with access to new and innovative services & applications.
Provides personal communication to mass market regardless of location, network & terminal used.
Requires,
Multi-media
Multi-environment
Multi-operators- Virtual operators 11
TD-CDMA:
Combination of TDMA,CDMA & FDMA.
5Mhz Bandwidth
Supports asymmetric traffic such as IP
UTRA-Universal Terrestrial Radio Access

12. Enhancement Over 2.5G: Global Standard
Compatibility within different networks
High quality
Worldwide common frequency band
Worldwide roaming capability
Multimedia applications
High speed packet data rates
2Mbps for “Fixed”
384 Kbps for “Pedestrian”
144 Kbps for “Vehicle” 12

14. 14

15. Objectives: High network capacity : more simultaneous users per cell,
A data rate of at least 100 Mbps between any two points in the world,
Smooth Handoff across heterogeneous network
Seamless connectivity and global roaming across multiple networks,
High quality of service for next generation multimedia support (real time audio, high speed data, HDTV video content, mobile TV, etc),
Interoperability with existing wireless standards. 15

16. Challenges To 4G: To Provide lower Expenditure cost and Capital Cost
To Support Wide variety of spectrum band
To Develop cost effective High Performance Cell Site
To Provide more ‘’Bandwidth‘’ at backhaul portion of network
To Support Voice over Internet Protocol (VoIP) application 16

17. Technologies: New Base Station Technology
Advance Antenna design , integration strategies & configuration
Novel Backhaul method
Advance DSP techniques
Solution for Multihop relay 17

18. Conceptual View 4G: 18

19. Proposed Architecture of 4G:19

20. OFDM Multi carrier modulation Divides Band B into N subcarrier
Parallel bit streams B/N Apart
Subcarrier sum up before Transmission
Coding, Decoding data through IP 20

21. Smart Antennas-MIMO: Smartness at both transmitter & receiver
Employs SDMA
Multiple parallel channels operating simultaneously on same Band of freq.
Combined with adaptive Coding & Decoding 21

22. What can you do with it? What is Wi-Fi? Wireless Fidelity
Any type of network whether b,802.11a,802.11g,dual-band etc.
Uses RF to transmit Data through Air
What can you do with it?
Quick/easy network access
Staff access to corporate network
Patron internet access(hotspot)
Interconnecting two network 22

23. 23

24. What can you do with it? What is Wi-MAX?
Worldwide Interoperability for Microwave Access,
Broadband wireless access(BWA) technique
Offers broadband connection over long distance
Any type of network.
What can you do with it?
Connecting Wi-Fi hotspots to the Internet.
Providing data and telecommunications services.
Providing a source of Internet connectivity as part of a business continuity plan.
Providing portable connectivity. 24

25. Comparison Of Wi-Fi & Wi-MAX
WiMAX uses is a long range system,
WiMAX uses licensed or unlicensed spectrum.
Wi-MAX is less interactive with end user devices.
WiMAX uses a mechanism based on connections between the base station and the user device.
WiMAX runs a connection- oriented MAC.
WiFi is limited to short range Cells
Wi-Fi uses unlicensed spectrum to provide access to a network.
Wi-Fi is more popular in end user devices.
Wi-Fi has a QoS mechanism similar to fixed Ethernet, where packets can receive different priorities based on their tags. For example VoIP
Wi-Fi runs on the Media Access Control's CSMA/CA protocol.
Comparison Of Wi-Fi & Wi-MAX 25

26. Conclusion:
Next Generation(4G) network is a broadband packet network & requires Giga- bit wireless technology of ~1Gbps capability.
Killer Application: Wireless visual communication?
There are many interesting & Important research topics before the born of 4G wireless systems:
Gigabit wireless technology : Broadband CDMA, Hybrid ARQ, MIMO
High efficient video coding technique
Multihop technique in cellular system

27. THANK YOU
ARE … WE…. EVOLUTING???