Optimization of wavelet based OFDM for multipath powerline channel by genetic algorithm

Kumbasar, Volkan; Kucur, Oğuz; Ergin, A.A.; Öztürk, Ertan

doi:10.1002/wcm.694

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…For continuous wavelet transform there exist no viable inverse in practice due to the redundancy in the information which will require extensive analytical calculation, but in theory (only mathematically) the inverse for this transform can be written as [6]:…”

Section: Wavelets Backgroundmentioning

confidence: 99%

“…Unlike the conventional FFT-OFDM system wavelet scheme satisfies the condition for orthogonality and achieves perfect reconstruction (PR) using the orthogonal filters of the Quadrature mirror filter (QMF) banks [6]. Discrete wavelet transform has large power spectral density as compared to FFT-OFDM due to the fact that DWT produce well contained side lobes with the narrower side lobe having the contained energy with reduced out-of-band emissions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance Evaluation of DWT-OFDM and FFT-OFDM for Multicarrier Communications Systems using Time Domain Zero Forcing Equalization

Asif¹,

Abd‐Alhameed²,

Anoh³

et al. 2012

IJCA

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Other than the conventional fast Fourier transform (FFT) for multicarrier modulation, a new approach for multicarrier modulation (MCM) has been known. Meanwhile, multicarrier modulation involves dividing the broadband channel into many orthogonal but overlapping narrowband carriers. In an OFDM modulation based multicarrier system using the FFT, a cyclic prefix (CP) is inserted after each symbol frame to combat the effects of inter symbol interference (ISI). By inserting the CP, which results in spectral inefficiency OFDM schemes trades up to 25% of the transmit bandwidth. A new MCM approach that is void of the expense is the wavelet transform-based systems. These systems also have very suppressed side-lobes and exhibit improved BER performance. In wavelet based systems, the latest challenge in its implementation is in the channel estimation. In this work we have studied the performance of the FFT based OFDM system against wavelet transform (WT) based multicarrier system using a simple zero forcing (ZF) equalization in time domain. The studied system shows some improved BER performance.

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Section: Wavelets Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of DWT-OFDM and FFT-OFDM for Multicarrier Communications Systems using Time Domain Zero Forcing Equalization

Asif¹,

Abd‐Alhameed²,

Anoh³

et al. 2012

IJCA

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show abstract

“…The wavelet-based system achieves orthogonality through the use of orthogonal wavelet filters, also referred to as filter banks [19]. The DWT produces narrow side lobes with large power spectral density.…”

Section: Introductionmentioning

confidence: 99%

A Unique Wavelet-based Multicarrier System with and without MIMO over Multipath Channels with AWGN

Asif¹,

Abd‐Alhameed²,

Noras³

2015

IJCA

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Recent studies suggest that multicarrier systems using wavelets outperform conventional OFDM systems using the FFT, in that they have well-contained side lobes, improved spectral efficiency and BER performance, and they do not require a cyclic prefix. Here we study the wavelet packet and discrete wavelet transforms, comparing the BER performance of wavelet transform-based multicarrier systems and Fourier based OFDM systems, for multipath Rayleigh channels with AWGN. In the proposed system zero-forcing channel estimation in the frequency domain has been used. Results confirm that discrete wavelet-based systems using Daubechies wavelets outperform both wavelet packet transform-based systems and FFT-OFDM systems in terms of BER. Finally, Alamouti coding and maximal ratio combining schemes were employed in MIMO environments, where results show that the effects of multipath fading were greatly reduced by the antenna diversity.

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“…The orthogonality between the subcarriers follows the orthogonal characteristic of Wavelet transform. Besides, it provides bandwidth efficiency as compared to the DFT based OFDM systems [2]. Wavelet packet decompositions generate set of self and mutually orthogonal waveforms which could also be used for synchronous orthogonal multiplexing for wireless communication system [3].…”

Section: Introductionmentioning

confidence: 99%

Doppler reduction using Sliding Window technique in WP-OFDM system

Taha

Salleh

2011

IEICE Electron. Express

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This letter presents a new Wavelet Packet (WP) OFDM system using a Sliding Window (SW) technique. The SW is used to increase signal orthogonality and thus reduces the Doppler frequency effect in the received data. This is done by reducing the round-off error and long correlation time of the received data. Simulation results show that the proposed system offers significant BER gains over the standard WP-OFDM system without SW under flat fading and the Additive White Gaussian noise (AWGN) channel.

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Optimization of wavelet based OFDM for multipath powerline channel by genetic algorithm

Cited by 9 publications

References 20 publications

Performance Evaluation of DWT-OFDM and FFT-OFDM for Multicarrier Communications Systems using Time Domain Zero Forcing Equalization

Performance Evaluation of DWT-OFDM and FFT-OFDM for Multicarrier Communications Systems using Time Domain Zero Forcing Equalization

A Unique Wavelet-based Multicarrier System with and without MIMO over Multipath Channels with AWGN

Doppler reduction using Sliding Window technique in WP-OFDM system

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