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Highlights Concept of OFDM with spectrum Digital modulation basics Principles OFDM process with flow chart Frequency samples Single & multi carrier system.

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Presentation on theme: "Highlights Concept of OFDM with spectrum Digital modulation basics Principles OFDM process with flow chart Frequency samples Single & multi carrier system."— Presentation transcript:

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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 Digital modulation 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 OFDM Sensitive to High Frequency Phase Noise OFDM Sensitive to 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.

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