Orthogonal Frequency Division Multiplexing

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Presentation transcript:

Orthogonal Frequency Division Multiplexing BOĞAZİÇİ UNIVERSITY Department of Computer Engineering CMPE 530 – Mathematical Foundations of Artificial Intelligence Project Presentation Orthogonal Frequency Division Multiplexing Prepared by: Buluç Çelik - 2003700543

Outline Introduction Multiplexing Background Orthogonal Frequency Division Multiplexing Conclusion

Introduction Orthogonal Frequency Division Multiplexing (OFDM) is a multiplexing technique where the data is distributed over a large number of sub-carriers spaced apart orthogonally. Benefits: High spectral efficiency Resiliency to interference

Introduction (Cont...) Application areas include: Digital Audio Broadcasting (DAB) Digital Terrestrial Television Broadcasting (DTTB) Wireless Local Area Networks Asymmetric Digital Subscriber Line (ADSL) standard IEEE 802.11a

Multiplexing Background The technique of having a transmission capacity to be shared by many transmission sources MUX DEMUX 1 data link, n data channels n inputs n outputs

Multiplexing Background (Cont...) Time Division Multiplexing Time Frequency

Multiplexing Background (Cont...) Frequency Division Multiplexing Time Frequency

Multiplexing Background (Cont...) Frequency Division Multiplexing (cont...)

Orthogonal Frequency Division Multiplexing Orthogonal sub carriers satisfying the following conditions are used The modulation formula of an OFDM signal:

Orthogonal Frequency Division Multiplexing (Cont...) The Fourier transform of each sub-carrier signal is a sinc function in frequency domain The zeroes of this sinc function occur at intervals f0. Since the sub-carrier spacing is exactly f0, there is no inter sub-carrier interference. Having overlapping sub-carrier spectrums, OFDM technique uses the spectrum very efficiently.

Conclusion OFDM has high spectral efficiency OFDM is resilient to RF interference The implementation relies on very high speed DSP, which has only recently become available at a price that makes OFDM a competitive technology in the marketplace.

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