Browsing by Author "Çırpan, Hakan Ali"
Now showing items 1-20 of 27
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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 ... -
Advanced signal processing algorithms for wireless communications
Panayırcı, Erdal; Çırpan, Hakan Ali (Springer-Verlag Berlin, 2006)Traditional wireless technologies are not well suited to meet the extremely demanding requirements of providing the very high data rates with the ubiquity mobility and portability characteristic of cellular systems. Some ... -
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 ... -
Blind phase noise estimation and data detection based on SMC technique and unscented filtering
In this paper, a computationally efficient algorithm is presented for tracing phase noise with linear drift and blind data detection jointly, based on a sequential Monte Carlo(SMC) method. Tracing of phase noise is achieved ... -
Blind-phase noise estimation in OFDM systems by sequential Monte Carlo method
Panayırcı, Erdal; Çırpan, Hakan Ali; Moeneclaey, Marc; Noels, Nele (John Wiley and Sons Ltd, 2006)One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) systems is the phase noise (PN) caused by the oscillator instabilities. Unfortunately due to the PN the most valuable feature namely orthogonality ... -
Channel estimation for MIMO-OFDM systems in fixed broadband wireless applications
Karakaya, Bahattin; Çırpan, Hakan Ali; Panayırcı, Erdal (IEEE, 2007)Systems employing multiple transmit and receive antennas known as multiple input multiple output (MIMO) systems can be used with OFDM to improve the resistance to channel impairments. Thus the technologies of OFDM and MIMO ... -
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 ... -
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 ... -
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 ... -
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 ... -
An efficient joint channel estimation and decoding algorithm for turbo-coded space-time orthogonal frequency division multiplexing receivers
Doğan, Hakan; Çırpan, Hakan Ali; Panayırcı, Erdal (Inst Engineering Technology-IET, 2008)The challenging problem in the design of digital receivers of today's and future high-speed high data-rate wireless communication systems is to implement the optimal decoding and channel estimation processes jointly in a ... -
An efficient joint data detection and channel estimation technique for uplink MC-CDMA systems based on SAGE algorithm
Panayırcı, Erdal; Doğan, Hakan; Çırpan, Hakan Ali; Fleury, Bernard Henri (IEEE, 2007)This paper is concerned with joint channel estimation and data detection for uplink multicarrier code-division multiple-access (MC-CDMA) systems in the presence of frequency fading channel. The detection and estimation ... -
EM based Stochastic maximum likelihood approach for localization of near-field sources in 3-D
Kabaoğlu, Nihat; Çırpan, Hakan Ali; Paker, Selçuk (Walter De Gruyter Gmbh, 2004)The goal of this paper is to estimate the locations of unknown sources in 3-D space from the data collected by a 2-D rectangular array. Various studies employing different estimation methods under near-field and far-field ... -
EM-based joint data detection and channel estimation for uplink MC-CDMA systems over frequency selective channels
Doğan, Hakan; Panayırcı, Erdal; Çırpan, Hakan Ali; Fleury, Bernard Henri (IEEE, 2007)This paper is concerned with joint channel estimation and data detection for uplink multicarrier code-division multiple-access (MC-CDMA) systems in the presence of frequency fading channel. The detection and estimation ... -
EM-Based MAP channel estimation and data detection for downlink MCC-CDMA systems
Doğan, Hakan; Panayırcı, Erdal; Çırpan, Hakan Ali (IEEE, 2007)In this work we propose a joint MAP channel estimation and data detection technique based on the Expectation Maximization (EM) method with paralel interference cancelation(PIC) for downlink multi-carrier (MC) code division ... -
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 ... -
Gezgin iletişim sistemlerinde alıcı tasarımı için yeni ileri sinyal işleme algoritmalarının geliştirilmesi
Çırpan, Hakan Ali; Panayırcı, Erdal (2007)[Abstract Not Available] -
Iterative channel estimation and decoding of turbo coded SFBC-OFDM systems
Doğan, Hakan; Çırpan, Hakan Ali; Panayırcı, Erdal (IEEE, 2007)We consider the design of turbo receiver structures for space-frequency block coded orthogonal frequency division multiplexing (SFBC-OFDM) systems in the presence of unknown frequency and time selective fading channels. ... -
Iterative channel estimation techniques for uplink MC-CDMA systems
Doğan, Hakan; Panayırcı, Erdal; Çırpan, Hakan Ali (IEEE, 2007)In this work maximum likelihood (ML) channel estimation for uplink multicarrier code-division multiple-access (MC-CDMA) systems is considered in the presence of frequency fading channel. The expectation-maximization (EM)- ... -
Iterative Receiver for DS-CDMA Systems in the Presence of Time-Varying Channels
Doğan, Hakan; Panayırcı, Erdal; Çırpan, Hakan Ali; Cam, Gökhan (IEEE, 2008)In this paper we present an efficient iterative receiver structure of tractable complexity for joint multiuser detection and multichannel estimation (JDE) of direct-sequence code-division multiple-access systems operating ...