Browsing by Author "Erküçük, Serhat"
Now showing items 41-58 of 58
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A Novel Indoor Channel Model for TVWS Communications based on Measurements
Hashir, Syed Muhammad; Erküçük, Serhat; Baykaş, Tunçer (IEEE, 2018)In 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 ... -
Performance Investigation of IEEE 802.11af Systems Under Realistic Channel Conditions
Macit, Mustafa Can; Şenol, Habib; Erküçük, Serhat (IEEE, 2015)As 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 metropolitan local and personal area networks. Among ... -
Performance of Combinational Cooperative Detection Method under Realistic Conditions
Samo, Rameez Ahmed; Başaran, Mehmet; Erküçük, Serhat (IEEE Computer Society, 2020)Combinational cooperative detection (CCD) is a method where signal energies from multiple secondary users (SUs) are gathered in different combinations in order to reach a unique decision for each secondary user regarding ... -
Performance of ieee 802.11af systems under realistic channel conditions
Macit, Mustafa Can (Kadir Has Üniversitesi, 2016)As 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 ... -
Performance of IEEE 802.15.4a Systems in the Presence of Narrowband Interference
Fındıklı, Çağlar; Erküçük, Serhat; Çelebi, Mehmet Ertuğrul (IEEE, 2011)The regulatory agencies in Europe and Japan require the implementation of avoidance techniques in some bands to reduce interference to licensed systems. Accordingly ultra-wideband impulse radio (UWB-IR) based Wireless ... -
Performance of orbital angular momentum based communication systems under varied atmospheric turbulence
Ashfaq Sheikh, Abdul Ahad (Kadir Has Üniversitesi, 2016)Orbital Angular Momentum is gaining a lot of attention in the past years as it is providing the means to break free from the ever increasing shortage of options when it comes to Data Rates and Effective Frequency Utilization. ... -
Physical-layer security in visible light communications
Yeşilkaya, Anıl; Çoğalan, Tezcan; Erküçük, Serhat; Şadi, Yalçın; Panayırcı, Erdal; Haas, Harald; Poor, Harold Vincent (Institute of Electrical and Electronics Engineers Inc., 2020)Optical wireless communications (OWC) and its potential to solve physical layer security (PLS) issues are becoming important research areas in 6G communications systems. In this paper, an overview of PLS in visible light ... -
Power control and multihop communication approaches for the coexistence of ieee 802.11af and iEEE 802.22 networks in tv white space
Ulgen, Oguz (Kadir Has Üniversitesi, 2017)Communication 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 ... -
Practical Implementation of the Combinational Cooperative Detection Method
Çatak, Evren; Erküçük, Serhat (Springer, 2015)In conventional cooperative detection a fusion center decides on the presence or the absence of a primary user (PU) by gathering all the information from secondary users (SUs) and conveys this decision to all users. This ... -
Primary User Detection in IEEE 802.15.4a Based Wireless Sensor Networks
Sabucu, Yağmur; Erküçük, Serhat (IEEE, 2013)Ultra wideband impulse radio (UWB-IR) technology has been defined in the IEEE 802.15.4a standard for location and ranging applications. In this paper UWB-IR sensors are considered in wireless sensor networks (WSNs) with ... -
Primary user detection in Ultrawide-band based wireless sensor networks
Sabucu, Yağmur (Kadir Has Üniversitesi, 2013)in this thesis ultra-wideband (UWB) based wireless sensor networks (WSNs) are considered for the detection of a primary user. Different from earlier works (i) both uplink and downlink information of the primary user are ... -
Rapidly Varying Sparse Channel Tracking with Hybrid Kalman-OMP Algorithm
Büyükşar, Ayşe Betül; Şenol, Habib; Erküçük, Serhat; Cirpan, Hakan Ali (Springer, 2019)It is expected from future communication standards that channel estimation algorithms should be able to operate over very fast varying frequency selective channel models. Therefore in this study autoregressive (AR) modeled ... -
Realistic Channel Estimation of IEEE 802.11af Systems in TV White Space
Başaran, Mehmet; Macit, Mustafa Can; Şenol, Habib; Erküçük, Serhat (Institute of Electrical and Electronics Engineers Inc., 2020)This work investigates the realistic performance of IEEE 802.11af systems released for the efficient spectrum utilization of TV white space (TVWS). These systems are operated over many contiguous or non-contiguous channels ... -
Realistic performance considerations for combinational cooperative detection method
Samo, Rameez Ahmed (Kadir Has Üniversitesi, 2016)Combinational cooperative detection (CCD) method is different from the conventional cooperative detection method in the sense that each user may reach a different decision for the activity of the primary user. in the CCD ... -
SCMA codebook design approaches
Kiracı, Furkan (Kadir Has Üniversitesi, 2020)In 4G systems, Orthogonal Frequency-Division Multiple Access (OFDMA) has been used conventionally for multiple access purposes. This technique has low spectral efficiency since it allocates the resources orthogonally to ... -
SISO - MIMO applications and analysis of visible light communications systems
Yeşilkaya, Anıl (Kadir Has Üniversitesi, 2016)Rapid development in technology and increasing necessity to reach information instantaneously saturates RF bands rapidly. Because of that, it can be seen that we are gradually approaching upper limits of the band. It can ... -
Sparse Code Multiple Access-Based Edge Computing for IoT Systems
Alnoman, Ali; Erküçük, Serhat; Anpalagan, Alagan (IEEE-Inst Electrical Electronics Engineers Inc, 2019)In this paper, a sparse code multiple access (SCMA)-based edge computing scheme is proposed for Internet-of- Things (IoT) systems. The aim of implementing SCMA, which is a nonorthogonal multiple access resource allocation ... -
Wavelet-based cognitive SCMA system for mmWave 5G communication networks
Hosseini, Haleh; Anpalagan, Alagan; Raahemifar, Kaamran; Erküçük, Serhat (Inst Engineering Technology-IET, 2017)Fifth 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 ...