wireless communication system

wireless communication system by subhankar barman

1. WIRELESS COMMUNICATION 3G AND 4G SUBHANKAR BARMAN JALPAIGURI POLYTECHNIC INSTITUTE PRESENTED BY DEPT. OF ELECTRONICS AND TELECOMMUNICATION ENGINEERING ROLL NO: 46, YEAR: 2018

2. CONTENTS INTRODUCTION HOW WIRELESS COMMUNICATION WORK BLOCK DIAGRAM OF A WIRELESS COMMUNICATION SYSTEM WIRELESS MULTIPLE ACCSESS TYPES OF WIRELESS COMMUNICATION EVOLUTION OF CELLULAR NETWORKS LAYERS IN WIRELESS COMMUNICATION MERITS OF WIRELESS COMMUNICATION DISADVANTAGES APPLICATION ABOUT 3G ABOUT 4G CONCLUSION

3. INTRODUCTION One of the medium of communication. Basically Unguided medium. T ransfer the information without any electric conductor. Used for both short and long distance Radio frequency, Infrared ray, Laser light etc used for this communication.

4. HOW WIRELESS COMMUNICATION WORK TRANSMISSION PATH Encoder THE CHANNEL RECEPTION PATH Encryption Modulation Multiplexing Decoder Decryption Demodulation De-Multiplexing

5. BLOCK DIAGRAM OF WIRELESS COMMUNICATION Block diagram of wireless communication

6. WIRELESS MULTIPLE ACCESS FDMA TDMA CDMA

7. FDMA Frequency division multiple access. FDMA is the division of the frequency band allocated for wireless cellular telephone communication into channels. FDMA in Analogue Advanced Mobile Phone system (AMPS). The Digital-Advanced Mobile Phone Service (DAMPS). also uses FDMA but adds time division multiple access (TDMA). Each channel can be assigned to only one user at a time. Guard Band is use here.

8. FDMA

9. TDMA TDMA : Time Division Multiple Access. TDMA is digital transmission technology that allows a number of users to access a single radio-frequency (RF) channel without interference by allocating unique time slots to each user within each channel. TDMA divides each cellular channel into three time slots in order to increase the amount of data that can be carried.

10. TDMA

11. CDMA There is no restriction on time and frequency in this scheme. Parallel communication without collision and whole bandwidth can be used. Users are separated by code not by time slot and frequency slot.

12. TYPES OF WIRELESS COMMUNICATION Radio and Television Broadcasting Radar Communication Satellite Communication Cellular Communication Infrared Communication Wi-Fi Bluetooth Microwave Communication

13. LAYERS IN WIRELESS COMMUNICATION Application Layer Presentation Layer Transport Layer Session Layer Network Layer Data Link Layer  Physical Layer

14. EVOLUTION IN CELLULAR NETWORK

15. 3G Several times higher data speed. Enhanced audio and video streaming. Videoconferencing support. Web and WAP browsing at higher speeds. IPTV (TV through the internet) support .

16. 4G Support for interactive multimedia, voice, streaming video, Internet, and other broadband services. IP based mobile system. High speed, high capacity, and low cost per bit. Global access, service portability, and scalable mobile services. Seamless switching, and a variety of Quality of Service driven services. Better scheduling and call admission control techniques. Ad hoc and multi hop networks (the strict delay requirements of voice make multi hop network service a difficult problem). Better spectral efficiency.

17. Vo-LTE Vo-LTE stands for voice over Long Term Evolution. Utilizing IMS technology, it is a digital packet voice service that is delivered over IP via an LTE access network. Some benefits of Vo-LTE Promote scale Reduce complexity Enable interconnect and roaming

18. GROWTH IN WIRELESS SYSTEM The Demand of Wireless Communication increasing day by day. As shown in fig.

19. ADVANTAGES Cost Mobility Ease of Installation Reliability Disaster Recovery Flexibility

20. LIMITATIONS OF WIRELESS COMMUNICATION Interference Security Health Concerns Lesser range

21. APPLICATIONS OF WIRELESS COMMUNICATION Space Military Telecommunications Wireless Power Transmission Radar communication Artificial intelligence Intelligent Transport Systems

22. CONCLUSION In conclusion, wireless communications globally is something that people can expect as technology advances. Wireless communications has a lot of benefits and can make the world a lot more efficient. It does have concerns though as with every other new advancement that is made in today’s world. Wireless technology will be very important in the near future where the need for wires connecting individual devices seems to be coming to an end.

23. THANK YOU