1. Division multiplexing
seminar report On
Orthogonal frequency
Division multiplexing
Presentation by:
Sudhir Kumar Bhukta,
Regdn. No
Nihar Ranjan Jena,
Regdn. No

2. Highlights Concept of OFDM with spectrum Digital modulation basics
Principles
OFDM process with flow chart
Frequency samples
Single & multi carrier system
Multichannel systems
Advantages & disadvantages
Applications
Conclusion

3. What is OFDM? OFDM =>Orthogonal Frequency Division Multiplexing
It is a process of splitting of higher data streams into a number of lower data streams simultaneously.

4. OFDM DEFINITION OFDM = Orthogonal FDM
Carrier centers are put on orthogonal frequencies
ORTHOGONALITY - The peak of each signal coincides with trough of other signals
Subcarriers are spaced by 1/Ts

5. Spectrum of OFDM

6. Digital modulation basics
Types digital modulation
OFDM uses combination of ASK and PSK.

7. PRINCIPLES Multicarrier transmission. Time-domain spreading.
Frequency-domain spreading.

8. OFDM is a Block Process

9. Ofdm flowchart

10. frequency samples

11. Single Carrier System

12. Multi-Carrier System

13. Multichannel System

14. OFDM Advantages Efficiently Deals With Channel Delay Spread
Enhanced Channel Capacity
Efficiently Deals With Multi-path Fading
Adaptively Modifies Modulation Density
Robustness to Narrowband Interference

15. OFDM Disadvantages OFDM Sensitive to Small Carrier Frequency Offsets
OFDM Exhibits
High Peak to Average Power Ratio
High Frequency Phase Noise
Sampling Clock Offsets

16. Applications Digital Audio and Video Broadcasting Wireless Networking
Power-line Technology

17. CONCLUSION In simulation OFDM is used over an AWGN channel.
In hardware comparison OFDM has lower potential.
OFDM produces low hardware complexity.
It is a suitable modulation technique for high performance wireless telecommunication.

18. THANK YOU…

19. ANY QUERIES ?