Now showing items 1-20 of 58
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Achievable Performance of Bayesian Compressive Sensing Based Spectrum Sensing
Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali (IEEE, 2014)In 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 ... -
Analysis of Extended Busy Tone Performance for Coexistence between WRAN and WLAN TVWS Networks
Karatalay, Onur; Erküçük, Serhat; Baykaş, Tunçer (IEEE, 2015)TV White Spaces indicate spectrum bands which were reserved for licensed terrestrial TV broadcasting and opened to unlicensed use under regulatory conditions. One important regulation which is common in all regulatory ... -
Bayesian Compressive Sensing For Primary User Detection
Başaran, Mehmet; Erküçük, Serhat; Cirpan, Hakan Ali (Inst Engineering Technology-IET, 2016)In compressive sensing (CS)-based spectrum sensing literature most studies consider accurate reconstruction of the primary user signal rather than detection of the signal. Furthermore possible absence of the signal is not ... -
Bayesian compressive sensing for ultra-wideband channel estimation: algorithm and performance analysis
Özgör, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali (Springer, 2015)Due to the sparse structure of ultra-wideband (UWB) channels compressive sensing (CS) is suitable for UWB channel estimation. Among various implementations of CS the inclusion of Bayesian framework has shown potential to ... -
Bayesian compressive sensing for ultra-wideband channel models
Ozgor, Mehmet; Erküçük, Serhat; Cirpan, Hakan Ali (IEEE, 2012)Considering the sparse structure of ultra-wideband (UWB) channels compressive sensing (CS) is suitable for UWB channel estimation. Among various implementations of CS the inclusion of Bayesian framework has shown potential ... -
Busy tone based coexistence algorithm for WRAN and WLAN systems in TV white space
Karatalay, Onur; Erküçük, Serhat; Baykaş, Tunçer (Inst Engineering Technology-IET, 2018)TV White Space (TVWS) refers to frequency band reserved only for licensed terrestrial TV broadcasting and is opened to unlicensed use under regulatory conditions. While regulations protect licensed systems from interference ... -
Busy tone based power control for coordination of IEEE 802.11af and 802.22 system [IEEE 802.11af ve 802.22 Sistemlerinin Uyumlu Çalışmaları için Meşgul Ton Tabanlı Güç Kontrolü]
Ulgen, Oguz; Erküçük, Serhat; Karatalay, Onur; Baykaş, Tunçer (Institute of Electrical and Electronics Engineers Inc., 2017)In this paper a new power control algorithm based on busy tone approach has been proposed for the coordination of IEEE 802.22 and IEEE 802.11af systems in TV white space. Different from the earlier studies in addition to ... -
Busy Tone Based Power Control for Coordination of IFFY 802.11af and 802.22 System
Ülgen, Oğuz; Erküçük, Serhat; Karatalay, Onur; Baykas, Tuncer (IEEE, 2017)In this paper, a new power control algorithm based on busy tone approach has been proposed for the coordination of IEEE 802.22 and IEEE 802.11af systems in TV white space. Different from the earlier studies, in addition ... -
Busy Tone Implementation for Coexistence of IEEE 802.22 and 802.11 af Systems
Karatalay, Onur; Erküçük, Serhat; Baykaş, Tunçer (IEEE, 2015)In this paper a new algorithm based on busy tone approach has been proposed for the coexistence of IEEE 802.22 and IEEE 802.11af systems in TV white space. Different from the earlier study in addition to 802.11af access ... -
Channel Estimation for TDS-OFDM Systems in Rapidly Time-Varying Mobile Channels
Başaran, Mehmet; Şenol, Habib; Erküçük, Serhat; Çırpan, Hakan Ali (IEEE-Inst Electrical Electronics Engineers Inc, 2018)This paper explores the performance of time-domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM) systems operated under rapidly time-varying mobile channels. Since a rapidly time-varying channel contains ... -
Code shift keying impulse modulation for UWB communications
Erküçük, Serhat; Kim, Dong In; Kwak, Kyung Sup (IEEE-INST Electrical Electronics Engineers Inc, 2008)In this paper the system performance of M-ary code shift keying (MCSK) impulse modulation is studied in detail and compared to M-ary pulse position modulation (MPPM) under single- and multi-user scenarios. For that bounds ... -
Coexistence of cognitive radio based networks in tv white space
Karatalay, Onur (Kadir Has Üniversitesi, 2016)Due to increasing data rates in enhancing wireless communications RF spectrum which is one of the most crucial natural sources has become more valuable. in order to utilize the limited spectrum e_ciently and solve the ... -
Comparison of Compressed Sensing Based Algorithms for Sparse Signal Reconstruction
Çelik, Safa; Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali (IEEE, 2016)Compressed sensing theory shows that any signal which is defined as sparse in a given domain can be reconstructed using fewer linear projections instead of using all Nyquist-rate samples. In this paper we investigate basis ... -
Compressive sensing for ultra-wideband channel estimation: on the sparsity assumption of ultra-wideband channels
Başaran, Mehmet; Erküçük, Serhat; Cirpan, Hakan Ali (Wiley-Blackwell, 2014)Due 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 ... -
Data-Aided Autoregressive Sparse Channel Tracking for OFDM Systems
Buyuksar, Ayse Betul; Şenol, Habib; Erküçük, Serhat; Cirpan, Hakan Ali (IEEE, 2016)In order to meet future communication system requirements channel estimation over fast fading and frequency selective channels is crucial. In this paper Space Alternated Generalized Expectation Maximization Maximum a ... -
Detection of interdependent multiband systems for cognitive radios and ultra-wideband systems
Yılmaz, Burak (Kadir Has Üniversitesi, 2012)As 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 ... -
Detection of interdependent primary systems using wideband cognitive radios
Yılmaz, Burak; Erküçük, Serhat (Elsevier GMBH Urban & Fischer Verlag, 2013)Cognitive radios (CRs) may be sharing multiple frequency bands with primary systems if the CR is a wideband or an ultra wideband (UWB) system. In that case the CR should ensure all the coexisting primary systems in these ... -
Detection of jointly active primary systems
Yılmaz, Burak Alptug; Erküçük, Serhat (IEEE, 2012)Recent studies in cognitive radios consider the detection of multiple bands for a better utilization of the spectrum. If the cognitive radio (CR) is an ultra wideband (UWB) or a wideband system then the CR should ensure ... -
Detection of Multiple Primary Systems Using DAA UWB-IRs
Erküçük, Serhat; Lampe, Lutz; Schober, Robert (IEEE, 2009)Underlay ultra wideband (UWB) systems have to be able to detect the presence of primary systems operating in the same band for detect-and-avoid (DAA) operation. In this paper the performances of joint and independent ... -
The Effect of Channel Models on Compressed Sensing Based UWB Channel Estimation
Başaran, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali (IEEE, 2011)Ultra-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 ...
