Erküçük, Serhat
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Erküçük, Serhat
S.,Erküçük
S. Erküçük
Serhat, Erküçük
Erkucuk, Serhat
S.,Erkucuk
S. Erkucuk
Serhat, Erkucuk
Erküçük, S.
Erküçük,S.
Erküçük, Serhat
S.,Erküçük
S. Erküçük
Serhat, Erküçük
Erkucuk, Serhat
S.,Erkucuk
S. Erkucuk
Serhat, Erkucuk
Erküçük, S.
Erküçük,S.
Erküçük, Serhat
Job Title
Prof. Dr.
Email Address
Main Affiliation
Electrical-Electronics Engineering
Electrical-Electronics Engineering
05. Faculty of Engineering and Natural Sciences
01. Kadir Has University
Electrical-Electronics Engineering
05. Faculty of Engineering and Natural Sciences
01. Kadir Has University
Status
Former Staff
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ORCID ID
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Turkish CoHE Profile ID
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WoS Researcher ID
Sustainable Development Goals
15
LIFE ON LAND
0
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
14
LIFE BELOW WATER
0
Research Products
6
CLEAN WATER AND SANITATION
0
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
0
Research Products
4
QUALITY EDUCATION
0
Research Products
2
ZERO HUNGER
0
Research Products
10
REDUCED INEQUALITIES
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
4
Research Products
13
CLIMATE ACTION
0
Research Products
1
NO POVERTY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
0
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
0
Research Products
5
GENDER EQUALITY
0
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This researcher does not have a Scopus ID.
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Scholarly Output
66
Articles
20
Views / Downloads
347/6167
Supervised MSc Theses
9
Supervised PhD Theses
0
WoS Citation Count
302
Scopus Citation Count
405
WoS h-index
11
Scopus h-index
12
Patents
0
Projects
0
WoS Citations per Publication
4.58
Scopus Citations per Publication
6.14
Open Access Source
36
Supervised Theses
9
Google Analytics Visitor Traffic
| Journal | Count |
|---|---|
| IEEE Transactions on Wireless Communications | 4 |
| IET Communications | 3 |
| IEEE Transactions on Vehicular Technology | 3 |
| 2011 IEEE International Conference on Ultra-Wideband (ICUWB) | 2 |
| International Journal of Communication Systems | 2 |
Current Page: 1 / 7
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66 results
Scholarly Output Search Results
Now showing 1 - 10 of 66
Conference Object Citation - WoS: 6Citation - Scopus: 9The Effect of Channel Models on Compressed Sensing Based Uwb Channel Estimation(IEEE, 2011) Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan AliUltra-wideband (UWB) multipath channels are assumed to have a sparse structure as the received consecutive pulses arrive with a considerable time delay and can be resolved individually at the receiver. Due to this sparse structure there has been a significant amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. There are various implementations of the CS theory for the UWB channel estimation based on the assumption that the UWB channels are sparse. However the sparsity of a UWB channel mainly depends on the channel environment. Motivated by this in this study we investigate the effect of UWB channel environments on the CS based UWB channel estimation. Particularly we consider the standardized IEEE 802.15.4a UWB channel models and study the channel estimation performance from a practical implementation point of view. The study shows that while UWB channel models for residential environments (e. g. CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance channel models for industrial environments (e. g. CM8) may not be treated as having a sparse structure due to multipaths arriving densely. The results of this study are important as it determines the suitability of different channel models to be used with the CS theory.Article Citation - WoS: 12Citation - Scopus: 14Compressive Sensing for Ultra-Wideband Channel Estimation: on the Sparsity Assumption of Ultra-Wideband Channels(Wiley-Blackwell, 2014) Başaran, Mehmet; Erküçük, Serhat; Cirpan, Hakan AliDue to the sparse structure of ultra-wideband (UWB) multipath channels there has been a considerable amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. The main consideration of the related studies is to propose different implementations of the CS theory for the estimation of UWB channels which are assumed to be sparse. In this study we investigate the suitability of standardized UWB channel models to be used with the CS theory. In other words we question the sparsity assumption of realistic UWB multipath channels. For that we particularly investigate the effects of IEEE 802.15.4a UWB channel models and the selection of channel resolution both on channel estimation and system performances from a practical implementation point of view. In addition we compare the channel estimation performance with the Cramer-Rao lower bound for various channel models and number of measurements. The study shows that although UWB channel models for residential environments (e.g. channel models CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance channel models for industrial environments (e.g. CM8) may not be treated as having a sparse structure due to multipaths arriving densely. Furthermore it is shown that the sparsity increased by channel resolution can improve the channel estimation performance significantly at the expense of increased receiver processing. Copyright (c) 2013 John Wiley & Sons Ltd.Article Citation - WoS: 15Citation - Scopus: 17Wavelet-Based Cognitive Scma System for Mmwave 5g Communication Networks(Inst Engineering Technology-IET, 2017) Hosseini, Haleh; Anpalagan, Alagan; Raahemifar, Kaamran; Erküçük, SerhatFifth generation (5G) communication networks can achieve high spectral efficiency using sparse code multiple access (SCMA) scheme when large number of users are trying to transmit their data simultaneously. The sparsity of SCMA codewords offers the possibility of applying a low-complexity message passing algorithm as an alternative to maximum likelihood detector. However the requirement of densely deployed 5G users is to opportunistically explore new frequencies via cognitive features to overcome spectrum scarcity challenges. In this study spectrum sensing enables cognitive radio capabilities for the SCMA system applied in millimetre wave (mmWave) 5G communications. Proposed cognitive SCMA system can sense the spectrum holes and adapt the transmission in order to utilise the available subcarriers. Besides wavelet packet transform based techniques are used instead of conventional Fourier-based spectrum sensing (FSS) and orthogonal frequency-division multiple access (OFDMA). Wavelet packet spectrum sensing offers more accurate estimation of frequency and power compared with FSS. On the other hand wavelet packet multiple access is more flexible and robust against interference compared with OFDMA. The simulation results verify that the proposed method can significantly improve the performance of SCMA system in terms of probabilities of false alarm and detection and symbol error rate.Master Thesis Detection of Interdependent Multiband Systems for Cognitive Radios and Ultra-Wideband Systems(Kadir Has Üniversitesi, 2012) Yılmaz, Burak; Erküçük, SerhatAs a result of advances in the wireless technology new systems have been proposed and hence more frequency bands are occupied in the spectrum. Therefore the number ofavailable frequency bands for future wireless communication systems is decreasing and alternative communication technologies have appeared in recent years. These are cognitive radio and ultra wideband systems which use the spectrum more efficiently. -- Abstract'dan.Master Thesis Performance of Ieee 802.11af Systems Under Realistic Channel Conditions(Kadir Has Üniversitesi, 2016) Macit, Mustafa Can; Erküçük, SerhatAs the analog TV broadcasting channels have become less frequently used in the last decade there has been a great interest in these frequency bands for the deployment of regional local and personal area networks. Among them the local area network standard iEEE 802.11af denes PHY and MAC layer implementation of such networks in these unused frequency bands also named television white space (TVWS). According to the standard the systems may use contiguous or non-contiguous channels during their operation depending on the channel availability. Unlike perfectly known channel condition of iEEE 802.11af based systems used in the literature we investigate in detail the performance of different operation modes of these systems under realistic channel conditions. Accordingly we implement and compare the performances of perfectly known channel linear minimum mean-square error (LMMSE) estimator and a matching pursuit (MP) based channel estimator. MP based estimator being the more practical estimator compared to the others we assess how its performance approaches the other methods. According to simulation results MP-based channel estimation performance is found to be only 1-2 dB inferior compared to LMMSE-based estimation with known delays in low and medium SNR regions. Also the efects of guard interval rate channel resolution and separation of in-between bands in non-contiguous modes are tested in different scenarios. The results of thesis are important for practical implementation of iEEE 802.11af based systems.Article Citation - WoS: 1Citation - Scopus: 1Sparse Code Multiple Access With Time Spreading and Repetitive Transmissions(Wiley, 2025) Ulgen, Oguz; Tufekci, Tolga Kagan; Sadi, Yalcin; Erkucuk, Serhat; Anpalagan, Alagan; Baykas, TuncerFor the next-generation communication systems, to improve spectral efficiency and increase the data rate, new multiple access techniques have been investigated. Orthogonal multiple access techniques are widely used in traditional communication systems while nonorthogonal multiple access (NOMA), proposed in 5G, has been a promising technology for satisfying the demand for future wireless communication networks. Sparse code multiple access (SCMA) is a code-domain NOMA method that provides diversity gain with signal constellation coding. However, to increase the performance of SCMA, there are only limited works provided in the literature in terms of codebook design and receiver design. In this paper, a new multiple-access model is proposed by applying various diversity techniques for downlink SCMA. The performance of the proposed model is evaluated with both computer simulations and theoretical analysis. Results show that the proposed model provides a 1.6 dB gain in terms of the bit error rate (BER) under the Rayleigh fading channel.Master Thesis Power Control and Multihop Communication Approaches for the Coexistence of Ieee 802.11af and Ieee 802.22 Networks in Tv White Space(Kadir Has Üniversitesi, 2017) Ulgen, Oguz; Erküçük, SerhatCommunication networks have been among the most important research fields of scientists in the recent years. Researches have been conducted in various different topics and contents as technology has evolved. As some new technologies become available some technologies become out of date. One of the outdated technologies in recent years is the analog TV broadcasting. With the shift from analog TV broadcasting to digital TV broadcasting the frequency bands of old analog TV broadcasting has become available for the implementation of new technologies. This spectrum is called TV White Space (TVWS). Due to wide coverage and good signal transmission properties in TVWS researchers and engineers have focused on developing standards for this valuable spectrum. Within the same period of time another new technology based on cognitive radios has been investigated and implemented. Among the standards and technologies developed for TV White Space one focus area has been to allow the access of unlicensed (secondary) users to the spectrum. Even though solutions for protecting the licensed (primary) users has been successful researches for protecting the secondary users in coexistence have not given conclusive results. Several of these researches are on the coexistence of iEEE 802.22 wireless regional area network and iEEE 802.11af wireless local area network. However due to the nature of two heterogeneous networks not communicating with each other there is a need for further coexistence mechanisms. in this thesis different from the earlier works busy tone based power control and multihop communication algorithms are implemented for different coexistence scenarios of iEEE 802.22 and iEEE 802.11af. interfering packet rate results and successful packet transmission rate results obtained via computer simulations and improved results are presented. in addition interfering packet rate results and successful packet transmission rate results are presented under realistic channel models ii and log-normal shadowing. The presented results are important to improve the results of existing busy tone based approaches.Conference Object Citation - Scopus: 5A Novel Indoor Channel Model for Tvws Communications Based on Measurements(IEEE, 2018) Hashir, Syed Muhammad; Erküçük, Serhat; Baykaş, TunçerIn this paper we present an indoor measurement campaign for TV white space bands inside a university building. The measurement results are compared with different indoor propagation models in the literature. We observed large estimation errors for the total path loss value from all existing models. Consequently we are proposing a new indoor propagation model for TVWS frequencies which concatenates the effects of frequency dependent path loss with penetration losses due to walls and windows. Performance comparison with existing models show that the proposed model achieves superior performance compared to existing models in terms of Root-Mean-Squared Error (RMSE).Conference Object Citation - WoS: 6Citation - Scopus: 7Achievable Performance of Bayesian Compressive Sensing Based Spectrum Sensing(IEEE, 2014) Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan AliIn wideband spectrum sensing compressive sensing approaches have been used at the receiver side to decrease the sampling rate if the wideband signal can be represented as sparse in a given domain. While most studies consider the reconstruction of primary user's signal accurately it is indeed more important to analyze the presence or absence of the signal correctly. Furthermore these studies do not consider the achievable lower bounds of reconstruction error and how well the selected method performs correspondingly. Motivated by these issues we investigate in detail the primary user detection performance of Bayesian compressive sensing (BCS) approach in this paper. Accordingly we (i) determine the BCS signal reconstruction performance in terms of mean-square error (MSE) compression ratio and signal-to-noise ratio (SNR) and compare it with the conventionally used basis pursuit approach (ii) determine how well BCS performs compared with the Bayesian Cramer-Rao lower bound (BCRLB) of the signal reconstruction error and (iii) assess the probability of detection performance of BCS for various SNR and compression ratio values. The results of this study are important for determining the achievable performance of BCS based spectrum sensing.Conference Object Citation - Scopus: 2Linear Combination of Pulses for Coexistence in the Ieee 802.15.4a Standard(IEEE, 2009) Erküçük, Serhat; Kaleli, Burç ArslanThe low data rate accurate location ranging Wireless Personal Area Network zWPAN standard IEEE which is based on ultra wideband zUWBg impulse radios suggests using linear combination of pulses to reduce interference to coexisting primary systems. In this paper we consider possible implementations of linear combination of pulses as suggested in the standard and study the generated notches in the resulting code spectrum. Using the zy transform approach we show that the number of these notches is limited and the notch locations are not flexible due to the limited number of pulses allowed by the standard. We also make some suggestions for increasing the number of notches at desired frequencies.
