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Mühendislik ve Mimarlık Fakültesi / Faculty of Engineering and Architecture
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Elektrik-Elektronik Mühendisliği Bölümü
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Browsing Elektrik-Elektronik Mühendisliği Bölümü by Author

Browsing Elektrik-Elektronik Mühendisliği Bölümü by Author "0000-0002-1287-160X"

Now showing items 1-20 of 20

A novel discrete cuckoo search algorithm‐based selective mapping technique to minimize the peak‐to‐average power ratio of universal filtered multicarrier signal

Şimşir, Şakir; Taşpınar, Necmi (2020)

The universal filtered multicarrier (UFMC), which has emerged as a product of the intensive studies carried out for developing alternative waveforms compatible with the oncoming fifth generation (5G) technology, has rapidly ...
A novel discrete elephant herding optimization-based PTS scheme to reduce the PAPR of universal filtered multicarrier signal

Şimşir, Şakir; Taşpınar, Necmi (2021-12)

The recently proposed waveform called universal filtered multicarrier (UFMC) has already managed to get the attention of science world due to its superior features and it has been accepted as one of the foremost fifth ...
A novel selective mapping method based on cumulative symbol optimization for PAPR minimization in low complexity GFDM transmitter

Şimşir, Şakir; Taşpınar, Necmi (2022-05)

In this paper, the problem of high peak-to-average power ratio (PAPR) in the low complex version of the generalized frequency division multiplexing (LC-GFDM) is handled by developing a novel PAPR reduction method called ...
Advanced pilot design procedure based on HS algorithm for OFDM-IDMA system

Şimşir, Şakir; Taşpınar, Necmi (2018)

The direct effect of the pilot positions to the channel estimation performance gives an opportunity for minimising the estimation errors in multicarrier transmission technologies. To this end, harmony search (HS) algorithm ...
Advanced SLM scheme based on discrete forest optimization algorithm for PAPR minimization in UFMC waveform

Taşpınar, Necmi; Şimşir, Şakir (2021)

Inherent multicarrier transmission mechanism of the universal filtered multicarrier (UFMC) waveform engenders the problem of high peak-to-average power ratio (PAPR). Since it is impossible for a nonlinear high power amplifier ...
An efficient SLM technique based on migrating birds optimization algorithm with cyclic bit flipping mechanism for PAPR reduction in UFMC waveform

Taşpınar, Necmi; Şimşir, Şakir (2020)

The peak-to-average power ratio (PAPR) is one of the most serious issues to be dwelled on, carefully, in wireless communication. It is not possible to take the advantage of multicarrier transmission strategy without handling ...
An efficient technique based on firefly algorithm for pilot design process in OFDM-IDMA systems

Taşpınar, Necmi; Şimşir, Şakir (2018)

Accurate placement of pilot tones has been a crucial task in multicarrier transmission technologies since there is a strong relation between pilot positions and channel estimation performance. Therefore, the firefly algorithm ...
An improved PTS scheme based on a novel discrete invasive weed optimization algorithm for PAPR reduction in the UFMC signal

Şimşir, Şakir; Taşpınar, Necmi (2021-12)

Multicarrier transmission strategy provides great benefits in wireless communication technology. For this reason, all of the waveform contenders proposed for the fifth generation and beyond technologies are built on this ...
Bio-inspired pilot design approach based on genetic algorithm for OFDM-IDMA scheme

Taşpınar, Necmi; Şimşir, Şakir (2020)

It is well known that the efficiency of a channel estimator employing the strategy of comb-type pilot placement can be controlled by adjusting the positions of pilot tones. In this paper, by considering this situation, in ...
Channel estimation techniques in OFDM-IDMA systems

Taşpınar, Necmi; Şimşir, Şakir (2014)

In this paper, pilot based channel estimation techniques for orthogonal frequency division multiplexing-interleave division multiple access (OFDM-IDMA) systems are investigated. Least Squares (LS) and Minimum Mean Square ...
Channel estimation using an adaptive neuro fuzzy inference system in the OFDM-IDMA system

Taşpınar, Necmi; Şimşir, Şakir (2017)

In this paper, a channel estimator based on an adaptive neuro fuzzy inference system (ANFIS) is proposed for the purpose of estimating channel frequency responses in orthogonal frequency division multiplexing-interleave ...
Channel estimation using neural network in Orthogonal Frequency Division Multiplexing-Interleave Division Multiple Access (OFDM-IDMA) system

Şimşir, Şakir; Taşpınar, Necmi (2014)

In this paper, channel estimation based on neural network trained by Levenberg-Marquardt Algorithm is proposed to estimate the channel coefficients in Orthogonal Frequency Division Multiplexing-Interleave Division Multiple ...
Channel estimation using radial basis function neural network in OFDM-IDMA system

Şimşir, Şakir; Taşpınar, Necmi (Springer, 2015)

In this paper, channel estimation based on Radial Basis Function Neural Network (RBFNN) is proposed to estimate channel frequency responses in orthogonal frequency division multiplexing–interleave division multiple access ...
Cumulative symbol optimization–based partial transmit sequence technique for PAPR reduction in low complexity GFDM system

Şimşir, Şakir; Taşpınar, Necmi (2020)

The new waveform called generalized frequency division multiplexing (GFDM), which has been increasing its popularity among the fifth generation (5G) waveform candidates day by day, is suggested very recently to meet the ...
Dual symbol optimization-based partial transmit sequence technique for PAPR reduction in WOLA-OFDM waveform

Taşpınar, Necmi; Şimşir, Şakir (2019)

Weighted overlap and add-orthogonal frequency division multiplexing (WOLA-OFDM) is a new waveform proposed recently for meeting the requirements of fifth generation (5G) telecommunication standards. In spite of being a ...
Katı hal güç kuvvetlendiricisinin LC-GFDM iletim sinyali üzerindeki etkisinin incelenmesi

Şimşir, Şakir; Taşpınar, Necmi (2022-10)

Bu çalışmada, en yaygın kullanılan yüksek güç kuvvetlendiricileri arasında yer alan katı hal güç kuvvetlendiricisi (SSPA), düşük karmaşıklı-genelleştirilmiş frekans bölmeli çoğullama (LC-GFDM) vericisine uygulanmış olup, ...
PAPR reduction based on partial transmit sequence technique in UFMC waveform

Taşpınar, Necmi; Şimşir, Şakir (2019)

In this paper, the partial transmit sequence (PTS) technique known as one of the most efficient peak to average power ratio (PAPR) reduction schemes is applied to the recently proposed fifth generation (5G) waveform candidate ...
PAPR reduction using selective mapping scheme in universal filtered multicarrier waveform

Şimşir, Şakir; Taşpınar, Necmi (2020)

In this paper, the selective mapping (SLM) technique possessing the powerful and distortionless peak to average power ratio (PAPR) reduction capability was employed in universal filtered multicarrier (UFMC) waveform that ...
Pilot tones design using Grey Wolf Optimizer for OFDM-IDMA system

Şimşir, Şakir; Taşpınar, Necmi (2017)

Since the channel estimation performance is affected directly by the positions of pilot tones, the optimization of pilot placement process known as having quite important role on minimizing the estimation errors has become ...
Pilot tones design using particle swarm optimization for OFDM-IDMA system

Taşpınar, Necmi; Şimşir, Şakir (2019)

Since the channel estimation performance is directly affected by the pilot positions, it has been a major task in multicarrier transmission schemes to adjust the pattern of pilot distribution for the purpose of minimizing ...