Browsing by Author "Panayirci, Erdal"
Now showing items 1-20 of 122
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A low-complexity KL expansion-based channel estimator for OFDM systems
This paper first proposes a computationally efficient pilot-aided linear minimum mean square error (MMSE) batch channel estimation algorithm for OFDM systems in unknown wireless fading channels. The proposed approach employs ...
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A low-complexity time-domain MMSE channel estimator for space-time/frequency block-coded OFDM systems
Authors:Şenol, Habib; Cirpan, Hakan Ali; Panayirci, Erdal
Publisher and Date:(Hindawi Publishing Corporation, 2006)Focusing on transmit diversity orthogonal frequency-division multiplexing (OFDM) transmission through frequency-selective channels this paper pursues a channel estimation approach in time domain for both space-frequency ...
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A Mobile Channel Model for VLC and Application to Adaptive System Design
Authors:Miramirkhani, Farshad; Narmanlioglu, Omer; Uysal, Murat; Panayirci, Erdal
Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2017)In this letter we propose a realistic channel model for visible light communication (VLC) assuming a mobile user. Based on non-sequential ray tracing we first obtain channel impulse responses for each point over the user ...
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A Monte Carlo implementation of the SAGE algorithm for joint soft-multiuser decoding channel parameter estimation and code acquisition
Authors:Kocian, Alexander; Panayirci, Erdal; Poor, H. Vincent; Ruggieri, Marina
Publisher and Date:(2010)This paper presents an iterative scheme for joint timing acquisition multi-channel parameter estimation and multiuser soft-data decoding. As an example an asynchronous convolutionally coded direct-sequence code-division ...
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A New Technique for OFDM: OFDM-Index Modulation
In this study a novel scheme called orthogonal frequency division multiplexing with index modulation (OFDMIM) is proposed for frequency selective channels. In this scheme the information is conveyed not only by only M -ary ...
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A Reliable Successive Relaying Protocol
Authors:Basar, Ertugrul; Aygölü, Ümit; Panayirci, Erdal; Poor, H. Vincent
Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2014)Successive relaying has recently emerged as an effective technique for cooperative networks and provides significant improvements in bandwidth efficiency over traditional relaying techniques ;however to achieve full-diversity ...
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Advanced signal processing algorithms for wireless communications
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 ...
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An efficient joint channel estimation and decoding algorithm for turbo-coded space-time orthogonal frequency division multiplexing receivers
Authors:Dogan, Hakan; Cirpan, Hakan Ali; Panayirci, Erdal
Publisher and Date:(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 ...
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An efficient joint data detection and channel estimation technique for uplink MC-CDMA systems based on SAGE algorithm
Authors:Panayirci, Erdal; Dogan, Hakan; Cirpan, Hakan Ali; Fleury, Bernard Henri
Publisher and Date:(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 ...
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An Efficient SAGE-based Data Detection Algorithm for OFDM Systems in the Presence of Very Fast Fading Channels
In this paper an iterative and computationally efficient data detection algorithm is proposed based on the space alternating generalized expectation maximization (SAGE) technique for orthogonal division multiplexing (OFDM) ...
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An Improved Adaptive Subspace Tracking Algorithm Based on Approximated Power Iteration
Authors:Wu, Qiang; Zheng, Jian-Sheng; Dong, Zhicheng; Panayirci, Erdal; Wu, Zhi-Qiang; Ren, Qingnuobu
Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2018)A subspace tracking technique has drawn a lot of attentions due to its wide applications. The main objective of this approach is to estimate signal or noise subspace basis for the sample covariance matrix. In this paper ...
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Analysis of visible light communation sytems and adaptive equalization effects
Communication by means of visible light is a newly developing technology that has been brought up as an alternative to the current electromagnetic based communication systems. The recently conducted studies led to the use ...
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Blind-phase noise estimation in OFDM systems by sequential Monte Carlo method
Authors:Panayirci, Erdal; Cirpan, Hakan Ali; Moeneclaey, Marc; Noels, Nele
Publisher and Date:(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 ...
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Channel estimation for MIMO-OFDM systems in fixed broadband wireless applications
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 ...
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Channel Estimation for SM Systems over Time-Varying Rayleigh Fading Channels
This paper is concerned with the challenging and timely problem of channel estimation for spatial modulated systems in the presence of time varying channels. Recently estimation of channel state information for SM systems ...
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Channel Estimation for Spatial Modulation Orthogonal Frequency Division Multiplexing Systems
A combination of spatial modulation and orthogonal frequency division multiplexing (SM-OFDM) has been recently proposed for multicarrier systems while assuming the perfect channel state information (P-CSI) available at the ...
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Channel estimation for visible light communications using neural networks
Authors:Yeşilkaya, Anıl; Karatalay, Onur; Öǧrenci, Arif Selçuk; Panayirci, Erdal
Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2016)Visible light communications (VLC) is an emerging field in technology and research. Estimating the channel taps is a major requirement for designing reliable communication systems. Due to the nonlinear characteristics of ...
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Channel estimation in underwater cooperative OFDM system with amplify-and-forward relaying
Authors:Şenol, Habib; Panayirci, Erdal; Erdoğan, Mustafa; Uysal, Murat
Publisher and Date:(IEEE, 2012)This paper is concerned with a challenging problem of channel estimation for amplify-and-forward cooperative relay based orthogonal frequency division multiplexing (OFDM) systems in the presence of sparse underwater acoustic ...
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Conditional Power and Rate Adaptation for MQAM/OFDM Systems Under CFO With Perfect and Imperfect Channel Estimation Errors
Authors:Dong, Zhicheng; Fan, Pingzhi; Panayirci, Erdal; Lei, Xianfu
Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2015)In this paper a new conditional power and rate adaptation scheme for orthogonal frequency-division multiplexing (OFDM) systems is proposed in the presence of carrier frequency offset (CFO) with perfect and imperfect channel ...
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Data Detection Based Iterative Channel Estimation for Coded SM-OFDM Systems
Authors:Acar, Yusuf; Leblebici, M. Merih; Dogan, Hakan; Panayirci, Erdal
Publisher and Date:(IEEE, 2016)The combination of spatial modulation (SM) and orthogonal frequency division multiplexing (OFDM) as SM-OFDM is a recently proposed efficient modulation scheme with exploiting the index of transmit antenna to convey information ...