Yazar "Panayırcı, Erdal" için listeleme
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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 ... -
Gezgin iletişim için uzay-zaman kodlamalı çok-taşıyıcılı tümleşik sistem tasarımı
Panayırcı, Erdal; Pusane, Ali Emre; Oğuz, Onur; Aygölü, Hasan Ümit (Tübitak, 2003-04)Günümüzde önemi hızla artan gezgin ve telsiz (mobile/wireless) iletişim sistemleri (uydu iletişimi, gezgin radyo, “indoor” iletişim) iletişim kanalının neden olduğu toplamsal Gauss gürültüsüne ek olarak sönümlemeden (fading) ... -
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 ... -
Maximum likelihood blind channel estimation for space-time coding systems
Çırpan, Hakan Ali; Panayırcı, Erdal; Çekli, Erdinç (Hindawi Publishing Corporation, 2002-05)Sophisticated signal processing techniques have to be developed for capacity enhancement of future wireless communication systems, In recent years, space-time coding is proposed to provide significant capacity gains over ... -
A new algorithm for joint time and phase synchronization in OFDM systems
Panayırcı, Erdal (IEEE, 2000)In this paper, a computationally efficient algorithm is presented for joint maximum likelihood (ML) timing and carrier phase synchronization of OFDM systems employing M-PSK modulation scheme with additive Gaussian noise, ... -
Non-data aided EM-Based channel estimation for OFDM systems with time-varying fading channels
Panayırcı, Erdal; Çırpan, Hakan Ali (Kluwer Academic Publishers, 2002)In this paper, a computationally efficient algorithm is presented for maximum a posteriori (MAP) channel estimation for OFDM systems employing M-PSK modulation scheme with additive Gaussian noise, based on the Expectation ... -
Non-data-aided ML carrier frequency and phase synchronization in OFDM systems
Panayırcı, Erdal; Georghiades, Costas N.; Huq, Ayesha T. (Wiley-Blackwell, 2001-04)In this paper non-data-aided(NDA), maximum likelihood(ML) algorithms are derived for the carrier frequency and phase offset, separately, for OFDM systems employing M-PSK modulation scheme. NDA ML estimation algorithm for ... -
A novel channel estimation algorithm for ultra wideband communication systems
Çağlar, Ekrem (Işık Üniversitesi, 2005)Ultra WideBand (UWB) is an emerging technology that is currently investigated as one viable solution for high capacity, short range wireless indoor systems. Its robustness in dense multipath environments, low cost and low ... -
On the performance of trellis coded M-PSK systems over Rician fading channels with phase jitter
Uysal, Murat; Aygölü, Hasan Ümit; Panayırcı, Erdal (Assoc Elettrotecnica Ed Elettronica Italiana, 2001-02)In this paper, the performance of trellis coded M-PSK systems is investigated operating over Rician fading channels with phase jitter. Thus the results reflect not only the degradation due to the effect of fading on the ... -
Performance analysis of space time transmit diversity in UMTS under presence of carrier phase offset
Toplu, Mehmet İlker (Işık Üniversitesi, 2003-12)The reguirements for the next generation of mobile communication systems are primarily driven by the explosive growth of worldwide mobile communication subscribers. Additionaly, 3G systems will allow various of new services ... -
Pilot-aided bayesian MMSE channel estimation for OFDM systems: Algorithm and performance analysis
Şenol, Habib; Çırpan, Hakan Ali; Panayırcı, Erdal (IEEE, 2004)This paper proposes a computationally efficient, pilot-aided minimum mean square error (MMSE) channel estimation algorithm for OFDM systems. The proposed approach employs a convenient representation of the discrete multipath ... -
Sequence estimation with transmit diversity for wireless communications
Panayırcı, Erdal; Aygölü, Hasan Ümit; Pusane, Ali Emre (Urban & Fischer Verlag, 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 ... -
A sequential Monte Carlo method for blind phase noise estimation and data detection
Panayırcı, Erdal; Çırpan, Hakan Ali; Moeneclaey, Marc (IEEE, 2005)In this paper, a computationally efficient algorithm is presented for blind phase noise estimation and data detection jointly, based on a sequential Monte Carlo method. The basic idea is to treat the transmitted symbols ...