Wavelet OFDM performance in frequency selective fading channels

Marius, Oltean; Nafornita, Miranda

doi:10.1109/iccomm.2010.5509085

Cited by 20 publications

(13 citation statements)

References 6 publications

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“…It was already shown [8] that in flat, time variant channels, WM outperforms OFDM, due to better time-localization of the wavelet functions. Furthermore, within Daubechies family, the best results are brought in the above considered scenario by those wavelets having small effective duration [9].…”

Section: Conclusion and Further Workmentioning

confidence: 95%

On the time-frequency localization of the wavelet signals, with application to orthogonal modulations

Oltean

Isar²

2009

2009 International Symposium on Signals, Circuits and Systems

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Orthogonal modulations are powerful techniques for digital data transmission, very well suited to radio channels. They use orthogonal basis, whose elements will be the "subcarriers" used in transmission. Some advantages of the wavelet functions compared to the windowed complex exponentials used in Orthogonal Frequency Division Multiplexing (OFDM) are highlighted. Thus, theoretical proof that Daubechies wavelets have better time-frequency localization is provided, opening new paths towards modern orthogonal modulation approaches, based on wavelets.

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Section: Conclusion and Further Workmentioning

confidence: 95%

On the time-frequency localization of the wavelet signals, with application to orthogonal modulations

Oltean

Isar²

2009

2009 International Symposium on Signals, Circuits and Systems

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“…Then, the serial data stream is split into M lower-rate parallel streams. After that, the data in each parallel branch is modulated by Inverse Discrete Wavelet Packet Transform (IDWPT) using wavelet packet basis which is generated by filter (6) . 10…”

Section: Wofdm and P Aprmentioning

confidence: 99%

PTS algorithm for PAPR suppression of WOFDM system

Liu

Sun

2013

Proceedings 2013 International Conference on Mechatronic Sciences, Electric Engineering and Computer (MEC)

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Partial transmit sequence is an efficient algorithm to solve the problem of high peak-to-average power ratio (P APR) in orthogonal frequency division multiplexing (OFDM).In this paper the PTS algorithm is used in Wavelet Packet Based Multi-Carrier Modulation system, but it still requires high computational complexity. A sUb-optimum PTS algorithm based on combined random-interleaved partition and Hadamard matrix is proposed to solve this problem. Simulation shows that the improved algorithm proposed in this paper can achieve good P APR reduction with low computational complexity and have nearly no influence on the bit error rate performance.

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“…Recent research focused on the multi-carrier transmission techniques [17,18], highlighted that some of disadvantages inherent in OFDM systems can be steadily counteracted using wavelet carriers instead of OFDM complex exponential waveforms. Due to the fact that these wavelet carriers provide orthogonality between subcarriers and spectral containment, besides they can be separated at the receiver side by correlation techniques [19,20]. The applications above reported, do already use wavelet carrier like Haar and Daubechies families, but need iterating process to implement that wavelet.…”

Section: On Potential Applications Of the Analytical Daublet Approachmentioning

confidence: 99%

Gunshot detection in noisy environments

Freire

Jose²

2010

Anais De VII International Telecommunications Symposium

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This paper offers a new regard on compactly supported wavelets derived from FIR filters. Although being continuous wavelets, analytical formulation are lacking for such wavelets. Close approximations for daublets (Daubechies wavelets) and their spectra are introduced here. The frequency detection properties of daublets are investigated through scalograms derived from these new analytical expressions. These near-daublets have been implemented on the Matlab TM wavelet toolbox and a few scalograms presented. This approach can be valuable for wavelet synthesis from hardware or for application involving continuous wavelet-based systems, such as wavelet-OFDM.

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Wavelet OFDM performance in frequency selective fading channels

Cited by 20 publications

References 6 publications

On the time-frequency localization of the wavelet signals, with application to orthogonal modulations

On the time-frequency localization of the wavelet signals, with application to orthogonal modulations

PTS algorithm for PAPR suppression of WOFDM system

Gunshot detection in noisy environments

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