Performance Analysis of Wavelet OFDM (WOFDM)

8/6/2019 Performance Analysis of Wavelet OFDM (WOFDM)

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Performance Analysis of

Wavelet OFDM (WOFDM)

ByAsma Latif

Dr. N.D. Gohar


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Presentation Outline

Brief Overview of Classical OFDMWavelet Theory

Wavelet implementation using FBApproach

WOFDMLimitations

Results


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Classical OFDM

Orthogonality is achieved via IFFT andFFT

Uses CP to combat channelimpairments

Reduces the BW Efficiency by factor

N/N+NCP

No equalization or simple equalization

needed at the receiver


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Shortcomings of Fourier

TransformsDoes not gives good information if the frequency

components of the signal varies with timeTransform is localized at f0 iff x[n] is infinite

A Solution: Short Time Fourier Transform: Windowed Version of

DFT

The Time Frequency Grid is uniform for all frequency and timeAnother Solution :Wavelet Transform

Both Frequency and Time Localization


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Wavelet Transform


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Properties of WaveletTransforms

Due to higher spectral containmentproperty of wavelets, it is better toameliorate the effects ofnarrowband interferenceBetter Frequency and Time

LocalizationOrthogonality


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Filter Bank Implementation-Synthesis FB


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Filter Bank Implementation-Analysis FB


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Classical OFDM


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Wavelet OFDM


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WOFDM Limitations


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Sensitivity of CFO for

WOFDM


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High PAPR for WOFDM and OFDM


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Performance Analysis


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Performance Analysis [2]


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Performance Analysis [3]


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Thank You

Performance Analysis of Wavelet OFDM (WOFDM)

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