Yazar "0000-0001-7328-6626" için listeleme
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Adaptive identification and equalization of magnetic recording channels
Özden, Mehmet Tahir; Kayran, Ahmet Hamdi; Panayırcı, Erdal (Wiley-Blackwell, 1998-03)A new RLS adaptive Volterra filter is presented. The nonlinear filtering problem is transformed into an equivalent multichannel, but linear, filtering problem. The multichannel input signal is completely orthogonalized ... -
Adaptive Kalman receiver for OFDM systems with transmit diversity in mobile wireless channels
Şen, Adnan; Çırpan, Hakan Ali; Panayırcı, Erdal (Walter De Gruyter GMBH, 2004-12)A new joint channel tracking and symbol detection scheme is proposed in this paper for pilot symbol assisted transmit diversity OFDM systems by exploiting the correlation of the adjacent subchannels. Modelling the channel ... -
Adaptive Volterra channel equalisation with lattice orthogonalisation
Özden, Mehmet Tahir; Kayran, Ahmet Hamdi; Panayırcı, Erdal (Institution of Engineering and Technology, 1998-04)The authors present a new recursive least-squares adaptive nonlinear equaliser based on Volterra series expansion. The main approach is to transform the nonlinear equalisation problem into an equivalent multichannel, but ... -
Analysis of self noise in a clock recovery systems with a high-order nonlinearity
Panayırcı, Erdal (Bogazici University Bebek, 1999)This paper presents a new technique to compute efficiently the I and Q spectra, and the I - Q cross-spectrum of the self noise appearing at the output of the zero-memory, high order nonlinear device employed in a clock ... -
Analysis of self noise in a clock recovery systems with a high-order nonlinearity
Panayırcı, Erdal (IEEE, 1998)This paper presents a new technique to compute efficiently the I and Q spectra, and the I - Q cross-spectrum of the self noise appearing at the output of the zero-memory, high order nonlinear device employed in a clock ... -
Analysis of self-noise in a clock recovery system with a high-order nonlinearity
Panayırcı, Erdal (IEEE-INST Electrical Electronics Engineers Inc, 2003-11)This correspondence presents a new technique to compute efficiently the spectra of the in-phase (I) and quadrature (Q) components as well as the cross-spectrum of the in-phase and quadrature (I-Q) components of self-noise ... -
Blind channel estimation for space-time coding systems with Baum-Welch algorithm
Çırpan, Hakan Ali; Panayırcı, Erdal (IEEE, 2002)In recent years, space-time coding is proposed to provide significant capacity gains over the traditional communication systems in fading wireless channels. In this paper, we consider the problem of blind estimation of the ... -
Channel estimation for space-time block coded OFDM systems in the presence of multipath fading
Panayırcı, Erdal; Çırpan, Hakan Ali (IEEE, 2002)In this paper, a computationally efficient, non-data-aided maximum a posterlori(MAP) channel estimation algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems with transmitter diversity using ... -
Design of optimum nyquist signals based on generalized sampling theory for data communications
Panayırcı, Erdal; Özuğur, Timuçin; Çaǧlar, Hakan (IEEE, Piscataway, NJ, United States, 1999-06)A new method is given for the optimal design of bandlimited Nyquist-type signal shapes for data communications, which maximizes its energy in a given time interval. The method is based on the periodically nonuniform sampling ... -
EM-Based sequence estimation for wireless systems with orthogonal transmit diversity
Panayırcı, Erdal; Aygölü, Hasan Ümit; Pusane, Ali Emre (IEEE, 2003)In this paper, an optimum sequence estimation algorithm for wireless systems with Alamouti's two transmitter diversity in the presence of multipath fading is proposed. The algorithm is based on a jointly iterative channel ... -
Eurasip journal on wireless commuication and networking: Editorial
Panayırcı, Erdal; Georghiades, Costas N.; Wang, Xinheng; Çırpan, Hakan Ali (Springer International Publishing, 2005-04-15)[No abstract available] -
Feature extraction in shape recognition using segmentation of the boundary curve
Özuğur, Timuçin; Denizhan, Yağmur; Panayırcı, Erdal (Elsevier Science BV, 1997-10)We present a new method for feature extraction of two-dimensional shape information based on segmentation of the boundary curve. This approach partitions closed shapes into segments and finds their angular spans. The number ... -
Frequency selective fading channel estimation in OFDM systems using KL expansion
Şenol, Habib; Çırpan, Hakan Ali; Panayırcı, Erdal (IEEE, 2005)This paper proposes a computationally efficient, linear minimum mean square error (MMSE) channel estimation algorithm based on KL series expansion for OFDM systems. Based on such expansion, no matrix inversion is required ... -
Hızlı sönümlemeli kanallarda yeni bir uzay-zaman-frekans kodlamalı OFDM sistem tasarımı
Oğuz, Onur; Aygölü, Hasan Ümit; Panayırcı, Erdal (IEEE, 2004)Bu çalışmada, frekans seçici hızlı sönümlemeli kanallarda telsiz iletişim için bir uzay-zaman-frekans çeşitlemesi yöntemi önerilmiştir. Önerilen yöntem, OFDM tekniğini kullanarak frekans seçici kanalı uygun hale getirdikten ... -
Iterative channel estimation approach for space-time/frequency coded OFDM systems with transmitter diversity
Çırpan, Hakan Ali; Panayırcı, Erdal; Doğan, Hakan (Assoc Elettrotecnica Ed Elettronica Italiana, 2004-06)Focusing on transmit diversity orthogonal frequency division multiplexing (OFDM) transmission through frequency selective channels, this paper pursues novel iterative channel estimation approaches for both space-frequency ... -
Joint channel tracking and symbol detection for OFDM systems with Kalman filtering
Şen, Adnan; Çırpan, Hakan Ali; Panayırcı, Erdal (Urban & Fischer Verlag, 2003)This paper proposes a new joint channel tracking and symbol detection scheme for pilot symbol-assisted OFDM systems in multipath fading. The proposed scheme uses Kalman filters for both channel tracking and subsequent ... -
Joint ML timing and phase estimation in OFDM systems using the EM algorithm
Panayırcı, Erdal; Georghiades, Costas N. (IEEE, 2000)In this paper, a computationally efficient algorithm is presented for joint maximum likelihood (ML) timing and carrier phase estimation of OFDM systems employing M-PSK modulation scheme with additive Gauissian noise, based ... -
Linear expansions for frequency selective channels in OFDM
Şenol, Habib; Çırpan, Hakan Ali; Panayırcı, Erdal (Elsevier GMBH, 2006)Modeling the frequency selective fading channels as random processes, we employ a linear expansion based on the Karhumen-Loeve (KL) series representation involving a complete set of orthogonal deterministic vectors with a ... -
A low-complexity KL expansion-based channel estimator for OFDM systems
Şenol, Habib; Çırpan, Hakan Ali; Panayırcı, Erdal (Springer International Publishing, 2005-04-05)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 ... -
Maximum a posteriori multipath fading channel estimation for OFDM systems
Panayırcı, Erdal; Çırpan, Hakan Ali (Assoc Elettrotecnica Ed Elettronica Italiana, 2002-10)In this paper, a non-data-aided maximum a posteriori (MAP) channel estimation technique for OFDM systems employing M-PSK modulation scheme is proposed. The technique requires a convenient representation of the discrete ...