Browsing by Author "Erküçük, Serhat"
Now showing items 21-40 of 58
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The effect of channel resolution on compressed sensing based Ultra-Wideband channel estimation [Kanal çözünürlü?ünün sıkıştırılmış algılama tabanlı ultra geni?ş bantlı kanal kesti?ri?mi?ne etki?si?]
Ultra short pulses are transmitted in Ultra-Wideband (UWB) communications. As a result of this pulses at the receiver can be resolved individually due to the sparse structure of the channel. Due to these properties the UWB ... -
The Effect of Codebook Design on the Conventional SCMA System Performance
Kiracı, Furkan; Bardakçı, Emine; Sadi, Yalçın; Erküçük, Serhat (IEEE, 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 ... -
Effect of Inter-Block-Interference-Free Region on Compressed Sensing Based Channel Estimation in TDS-OFDM Systems
Başaran, Mehmet; Erküçük, Serhat; Şenol, Habib; Cirpan, Hakan Ali (IEEE, 2016)Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is the basis technology for digital television standard (DTV) employed in some countries thanks to its high spectral efficiency when compared ... -
Effect of inter-block-interference-free region on compressed sensing based channel estimation in TDS-OFDM systems
Başaran, Mehmet; Erküçük, Serhat; Şenol, Habib; Çırpan, Hakan Ali (Institute of Electrical and Electronics Engineers Inc., 2016)Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) is the basis technology for digital television standard (DTV) employed in some countries thanks to its high spectral efficiency when compared ... -
The Effect of Primary User Bandwidth on Bayesian Compressive Sensing Based Spectrum Sensing
Başaran, Mehmet; Erküçük, Serhat; Cirpan, Hakan Ali (IEEE Computer Society, 2016)The application of compressive sensing (CS) theory has found great interest in wideband spectrum sensing. Although most studies have considered perfect reconstruction of the primary user signal it is actually more important ... -
The effect of secondary user locations on the cooperative detection performance [İki?nci?l kullanıcı konumlarının i?şbi?rli?kli? algılama yöntemi? performansına etki?si?]
Çatak, Evren; Erküçük, Serhat (IEEE, 2012)In conventional cooperative detection a fusion center decides on the presence or absence of the primary user by gathering all the information from secondary users and conveys this decision to all users. This approach does ... -
Effects of channel models and optional data rates on the IEEE 802.15.4a system performance [Kanal modellerinin ve seçime bağli veri hızlarının IEEE 802.15.4a sistem başarımına etkileri]
Findikli, Çağlar; Erküçük, Serhat (2010)The wireless personal area network standard IEEE 802.15.4a uses ultra wideband impulse radios (UWB-IRs) for precise ranging and location and as well as for communications at low data rates (about 1 Mb/s). In addition to ... -
Energy Efcient Downlink Resource Allocation in Cellular IoT Supported H-CRANs
Ferdouse, Lilatul; Woungang, Isaac W.; Anpalagan, Alagan S.; Erküçük, Serhat (Institute of Electrical and Electronics Engineers Inc., 2021)The cloud computing supported heterogeneous cloud radio access network (H-CRAN) is one of the promising solutions to support cellular IoT devices with the legacy cellular systems. However, the dense deployment of small ... -
Energy Efficient SCMA Supported Downlink Cloud-RANs for 5G Networks
Ferdouse, Lilatul; Erküçük, Serhat; Anpalagan, Alagan; Woungang, Isaac (IEEE, 2020)Cloud-radio access networks (C-RANs) are regarded as a promising solution to provide low cost services among users through the centralized coordination of baseband units for 5G wireless networks. The coordinated multi-point ... -
Enerji Verimli İletişim Sistemlerinin Tasarımı için Sıkıştırılmış Algılama Tabanlı Yaklaşımlar
Erküçük, Serhat; Çırpan, Hakan Ali (2016)Sıkıstırılmıs Algılama (Compressed Sensing, CS) teorisi, isaretin seyrek bölgede tanımlanabildigi durumlarda Nyquist hızından çok daha düsük hızlarda örneklenen isaretin basarılı bir sekilde geri kazanılabilecegi gerçegine ... -
Flexible physical layer based resource allocation for machine type communications towards 6G
Şadi, Yalçın; Erküçük, Serhat; Panayırcı, Erdal (Institute of Electrical and Electronics Engineers Inc., 2020)The exponential growth of Internet of Things applications necessitates the design of next generation cellular systems to provide native support for machine type communications (MTC). While 5G aims at providing this native ... -
Hybrid MEMS-Based molecular communication system
Erküçük, Serhat; Baykaş, Tunçer; Zeshan, Arooba; Pusane, Ali Emre (Institute of Electrical and Electronics Engineers Inc., 2019)In this paper, we consider a molecular communication link integrated in a micro-electro mechanical system (MEMS) based environment. We apply acoustic tweezing techniques to the molecular communication system to increase ... -
IEEE 802.15.4a Based Ultra Wideband Systems for Coexistence with Primary Users
Fındıklı, Çağlar; Erküçük, Serhat; Çelebi, Mehmet Ertuğrul (IEEE, 2015)Peaceful coexistence is a major implementation issue for both cognitive radios and ultra wideband (UWB) systems. Accordingly the UWB impulse radio (UWB-IR) based Wireless Personal Area Network (WPAN) standard IEEE 802.15.4a ... -
Joint Communication and Computing Resource Allocation in 5G Cloud Radio Access Networks
Ferdouse, Lilatul; Anpalagan, Alagan; Erküçük, Serhat (IEEE-Inst Electrical Electronics Engineers Inc, 2019)Cloud-radio access network (C-RAN) is regarded as a promising solution to manage heterogeneity and scalability of future wireless networks. The centralized cooperative resource allocation and interference cancellation ... -
Joint Detection of Primary Systems Using UWB Impulse Radios
Erküçük, Serhat; Lampe, Lutz; Schober, Robert (IEEE-INST Electrical Electronics Engineers Inc, 2011)Regulation in Europe and Japan requires the implementation of detect-and-avoid (DAA) techniques in some bands for the coexistence of licensed primary systems and secondary ultra wideband (UWB) systems. In a typical coexistence ... -
Joint Wavelet-Based Spectrum Sensing and FBMC Modulation for Cognitive mmWave Small Cell Networks
Hosseini, Haleh; Anpalagan, Alagan; Raahemifar, Kaamran; Erküçük, Serhat; Habib, Salman (Inst Engineering Technology-IET, 2016)Millimetre-wave (mmWave) 5G communications is an emerging technology to enhance the capacity of existing systems by thousand-fold improvement. Heterogeneous networks employing densely distributed small cells can optimise ... -
Linear Combination of Pulses for Coexistence in the IEEE 802.15.4a Standard
Erküçük, Serhat; Kaleli, Burç Arslan (IEEE, 2009)The 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 ... -
A new approach for coexistence of IEEE 802.11af and IEEE 802.22 systems
Ulgen, Oguz; Baykaş, Tunçer; Erküçük, Serhat (Institute of Electrical and Electronics Engineers Inc., 2018)In this paper various algorithms are proposed to help IEEE 802.11af and IEEE 802.22 wireless systems to coexist in TV white space by considering multiple techniques. By using busy tone power control and multihop communication ... -
Non-Orthogonal Multiple Access for Terahertz Communication Networks
Ülgen, Oğuz; Erküçük, Serhat; Baykaş, Tuncer (IEEE, 2021)Terahertz communications is one of the promising technologies for the future mobile communication networks. Due to the ever increasing need for high-speed data transfer, higher bandwidths are required. As a solution, higher ... -
Noncoherent Ultra Wideband Wireless Sensor Networks for Primary User Detection
Sabucu, Yağmur; Erküçük, Serhat (IEEE Computer Society, 2016)As a result of increasing demand for new technologies unlicensed usage of available spectrum has become very essential to provide an efficient usage of spectrum. For that reason sensor networks may be a reliable option to ...