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