Wavelet-based multicarrier transmission over multipath wireless channels

Negash, B.G.; Nikookar, H.

doi:10.1049/el:20001263

Cited by 74 publications

(49 citation statements)

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“…Kaizuran et al [12] calculated the computational complexity of orthogonal wavelet by exploring its orthonormal base and construction properties and found it to be O(N) which was much less than that of FFT with computational complexity as O(Nlog 2 N). The performance of the Wavelet Packet Modulation (WPM) was observed to perform much better than conventional OFDM for the signals passing through a fading channel and nonlinear High Power Amplifier in [13]. Saad et al in [14] evaluated similar results for the input signal in the presence of Gaussian and Impulsive Noise.…”

Section: Related Workmentioning

confidence: 99%

Implementation of SRRC Filter in Mobile WiMax with DWT Based OFDM System

Kaur¹,

Kumar²,

Sharma³

et al. 2016

IJCNIS

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Abstract-Pulse shaping filter when applied to the symbols generated for transmission in a bandwidth limited systems allow for bandwidth containment that reduces the Inter-Symbol Interference (ISI) arising from multipath signal reflections which further minimizes the probability of errors at the receiver. Wavelets encompass the advantages of transforming and mapping data onto orthogonal subcarriers with optimal flexibility as well as less complexity which leads to increase the bandwidth efficiency of an Orthogonal Frequency Division Multiplexing (OFDM) system. In this paper Square Root Raised Cosine (SRRC) a pulse shaping technique when applied to Discrete Wavelet Transform (DWT) based OFDM system in mobile WiMax is simulated and its performance analysis in terms of Bit Error rate (BER) as a function of Signal to Noise Ratio (SNR) is investigated for various modulation schemes under AWGN channel. The results obtained show that SRRC filter offers to significantly improve BER for the given SNR and enhance the performance of physical layer in Mobile WiMax. The performance measurements and analysis is done in the simulation developed in MATLAB.

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Section: Related Workmentioning

confidence: 99%

Implementation of SRRC Filter in Mobile WiMax with DWT Based OFDM System

Kaur¹,

Kumar²,

Sharma³

et al. 2016

IJCNIS

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“…If the number of available carriers for RU transmission is inadequate, due to lot of deactivations, then frequency hopping to another band is applied [6]. In [7] and [8] an interest of replacing Fourier transform by wavelet transform in multicarrier OFDM system is presented. The scheme gives better intercarrier interference (ICI) and inter symbol interference (ISI) reduction.…”

Section: Techniques For Cognitive Radiomentioning

confidence: 99%

“…The new µ m becomes [17]: (10) and the new stepsize µ(i) becomes the multiplication of a scaling factor ρ(0 < ρ < 1) with the smallest µ m [17]. The power to those carriers (p m ) is updated again according to (8) until all p m s are nonnegative and P T constraint is achieved.…”

Section: Adaptive Power Allocationmentioning

confidence: 99%

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Cognitive Radio Dynamic Access Techniques

Budiarjo

Лакшманан

Nikookar

2008

Wireless Pers Commun

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The ever growing demand for wireless services has placed enormous burden on valuable resources such as spectral bandwidth. This has resulted in a major rethinking in resource allocation policies culminating in an explosion of research activity in the field of Cognitive Radio (CR) towards optimum resource usage. In this tutorial paper the physical layer design and transmission techniques for CR in the context of efficient spectrum utilization are discussed. Spectrum sensing as the key element of CR awareness is described. Orthogonal frequency division multiplexing (OFDM) as a spectrally efficient modulation scheme is discussed and the rationale for its use in the CR system is explained. Spectrum pooling for efficient use of spectrum is studied and the role of adaptive OFDM techniques in this method is highlighted. Wavelet basis function as a replacement of Fourier transform in OFDM is evaluated. MIMO system as an added value to the CR performance is described. Adaptive Waveform and beamforming as alternative techniques in CR are reviewed.

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“…This may provide all the advantages of conventional OFDM, but also mitigate the problems of PAPR and carrier timing offset [13]- [15].…”

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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Wavelet-based multicarrier transmission over multipath wireless channels

Cited by 74 publications

References 1 publication

Implementation of SRRC Filter in Mobile WiMax with DWT Based OFDM System

Implementation of SRRC Filter in Mobile WiMax with DWT Based OFDM System

Cognitive Radio Dynamic Access Techniques

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

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