The document discusses wireless communication systems. It begins with an introduction and overview of how wireless communication works. It then presents the block diagram of a wireless communication system and describes different types of wireless multiple access techniques including FDMA, TDMA, and CDMA. The document also discusses the evolution of cellular networks, layers in wireless communication, applications of wireless communication such as radio, TV and satellites, and concludes by noting that wireless communication globally is advancing and bringing many benefits but also some concerns.

1. JALPAIGURI POLYTECHNIC INSTITUTE
PRESENTED BY

2. 1. INTRODUCTION
2. HOW WIRELESS COMMUNICATION WORK
3. BLOCK DIAGRAM OF A WIRELESS COMMUNICATION SYSTEM
4. WIRELESS MULTIPLE ACCSESS
5. TYPES OF WIRELESS COMMUNICATION
6. EVOLUTION OF CELLULAR NETWORKS
7. LAYERS IN WIRELESS COMMUNICATION
8. MERITS OF WIRELESS COMMUNICATION
9. DISADVANTAGES
10. APPLICATION
11. ABOUT 3G
12. ABOUT 4G
13. CONCLUSION

3. • One of the medium of communication. Basically
Unguided medium.
• Transfer 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. 1. TRANSMISSION PATH
Encoder
2. THE CHANNEL
3. RECEPTION PATH
Encryption Modulation Multiplexing
DecoderDecryptionDemodulationDe-Multiplexing

5. Block diagram of wireless communication

6. 1. FDMA
2. TDMA
3. 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. • Radio and Television Broadcasting
• Radar Communication
• Satellite Communication
• Cellular Communication
• Infrared Communication
• Wi-Fi
• Bluetooth
• Microwave Communication

13. • Application Layer
• Presentation Layer
• Transport Layer
• Session Layer
• Network Layer
• Data Link Layer
• Physical Layer

15. • 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. • 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 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. • The Demand of
Wireless
Communication
increasing day by day.
As shown in fig.

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

20. • Interference
• Security
• Health Concerns
• Lesser range

21. • Space
• Military
• Telecommunications
• Wireless Power Transmission
• Radar communication
• Artificial intelligence
• Intelligent Transport Systems

22. 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.