Panayırcı, Erdal
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P., Erdal
Panayirci,E.
Panayirci,Erdal
Erdal Panayırcı
Panayirci E.
Panayırcı,E.
Panayirci, Erdal
P.,Erdal
Erdal, Panayirci
Panayırcı E.
Panayırcı, Erdal
Panayırcı, Erdal
Panayırcı, Erdal
Panayirci,E.
Panayirci,Erdal
Erdal Panayırcı
Panayirci E.
Panayırcı,E.
Panayirci, Erdal
P.,Erdal
Erdal, Panayirci
Panayırcı E.
Panayırcı, Erdal
Panayırcı, Erdal
Panayırcı, Erdal
Job Title
Prof. Dr.
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Main Affiliation
Electrical-Electronics Engineering
Status
Former Staff
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Sustainable Development Goals
13
CLIMATE ACTION
0
Research Products
2
ZERO HUNGER
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
8
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
15
LIFE ON LAND
0
Research Products
14
LIFE BELOW WATER
0
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
5
GENDER EQUALITY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
2
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
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16
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0
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1
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0
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6
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0
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17
PARTNERSHIPS FOR THE GOALS
0
Research Products
4
QUALITY EDUCATION
0
Research Products
10
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0
Research Products
Documents
233
Citations
4188
h-index
28
Documents
158
Citations
2839
Scholarly Output
177
Articles
69
Views / Downloads
199/0
Supervised MSc Theses
9
Supervised PhD Theses
1
WoS Citation Count
3042
Scopus Citation Count
3833
WoS h-index
23
Scopus h-index
27
Patents
0
Projects
0
WoS Citations per Publication
17.19
Scopus Citations per Publication
21.66
Open Access Source
92
Supervised Theses
10
| Journal | Count |
|---|---|
| IEEE Transactions on Communications | 8 |
| IEEE Transactions on Vehicular Technology | 7 |
| IEEE Transactions on Signal Processing | 6 |
| EURASIP Journal on Wireless Communications and Networking | 6 |
| IET Communications | 6 |
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177 results
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Now showing 1 - 10 of 177
Article Citation - WoS: 8Citation - Scopus: 11An Improved Adaptive Subspace Tracking Algorithm Based on Approximated Power Iteration(IEEE-INST Electrical Electronics Engineers Inc, 2018) Wu, Qiang; Zheng, Jian-Sheng; Dong, Zhicheng; Panayırcı, Erdal; Wu, Zhi-Qiang; Ren, QingnuobuA 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 we focus on providing a fast stable and adaptive subspace tracking algorithm that is implemented with low computational complexity. An alternative realization of the fast approximate power iteration (FAPI) method termed modified FAPI (MFAPI) is also presented. Rather than solving an inverse square root of a matrix employed in the FAPI the MFAPI applies the matrix product directly to ensure the orthonormality of the subspace basis matrix at each recursion. This approach yields a simpler derivation and is numerically stable while maintaining a similar computational complexity as compared with that of the FAPI. Furthermore we present a detailed mathematical proof of the numerical stability of our proposed algorithm. Computer simulation results indicate that the MFAPI outperforms many classical subspace tracking algorithms particularly at the transient-state step.Conference Object Citation - WoS: 1Optical Spatial Modulation Ofdm System Design(IEEE, 2016) Cihan, Salih Bilge; Başar, Ertuğrul; Panayırcı, ErdalIn this paper a new optical orthogonal frequency division multiplexing (OFDM) method is proposed for multiple-input multiple-output (MIMO) visible light communications (VLC) systems. In the new scheme non-DC biased optical OFDM (NDC-OFDM) and optical spatial modulation (OSM) methods are combined to obtain a novel optical OFDM scheme which has a better error performance. The new scheme is named as non-DC biased optical spatial modulation OFDM (NDC-OSM-OFDM). It is shown via computer simulations that the proposed scheme achieves better bit error rate (BER) performance than DC-biased optical spatial modulation OFDM (OSM-OFDM-DC) asymmetrically clipped optical spatial modulation OFDM (OSM-OFDM-AC) and NDC-OFDM.Conference Object A Novel Transmit Array Structure for Optical Spatial Modulation(IEEE, 2019) Çoğalan, Tezcan; Haas, Harald; Panayırcı, ErdalThe performance of multiple input single output (MISO) and multiple input multiple output (MIMO) systems is limited by spatial channel correlation. This limitation becomes particularly severe in light lidelity (LiFi) systems, which use intensity modulation/direct detection (IM/DD) for data transmission, because light emitting diodes (LEDs) can only emit incoherent light. This paper proposes a novel transmitter structure that provides spatially separated channels and enables optical MISO/MIMO spatial modulation (SM) transmission without the need for a power allocation algorithm or a transmit precoding technique. A single LED array, which consists of multiple LEDs with different characteristics, is considered in an indoor environment. Different numbers of transmit LEDs are chosen for SM transmission based on the relation between channel correlation and bit error probability. It is shown that the proposed structure provides reliable SM transmission when the modulation order for M-ary pulse amplitude modulation (PAM) is considered as 2 and 4. Computer simulations also show that higher modulation order, e.g., 8-PAM, can be supported but at a slightly degraded bit error ratio (BER) performance.Article Citation - WoS: 4Citation - Scopus: 6A Low-Complexity Time-Domain Mmse Channel Estimator for Space-time/Frequency Block-Coded Ofdm Systems(Hindawi Publishing Corporation, 2006) Şenol, Habib; Çırpan, Hakan Ali; Panayırcı, ErdalFocusing 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 OFDM (SF-OFDM) and space-time OFDM (ST-OFDM) systems based on AR channel modelling. The paper proposes a computationally efficient pilot-aided linear minimum mean-square-error (MMSE) time-domain channel estimation algorithm for OFDM systems with transmitter diversity in unknown wireless fading channels. The proposed approach employs a convenient representation of the channel impulse responses based on the Karhunen-Loeve (KL) orthogonal expansion and finds MMSE estimates of the uncorrelated KL series expansion coefficients. Based on such an expansion no matrix inversion is required in the proposed MMSE estimator. Subsequently optimal rank reduction is applied to obtain significant taps resulting in a smaller computational load on the proposed estimation algorithm. The performance of the proposed approach is studied through the analytical results and computer simulations. In order to explore the performance the closed-form expression for the average symbol error rate (SER) probability is derived for the maximum ratio receive combiner (MRRC). We then consider the stochastic Cramer-Rao lower bound(CRLB) and derive the closed-form expression for the random KL coefficients and consequently exploit the performance of the MMSE channel estimator based on the evaluation of minimum Bayesian MSE. We also analyze the effect of a modelling mismatch on the estimator performance. Simulation results confirm our theoretical analysis and illustrate that the proposed algorithms are capable of tracking fast fading and improving overall performance. Copyright (C) 2006 Hindawi Publishing Corporation. All rights reserved.Conference Object Citation - WoS: 51Optical OFDM with Index Modulation for Visible Light Communications(Ieee, 2015) Basar, Ertugrul; Panayirci, ErdalIn this paper, we propose optical orthogonal frequency division multiplexing with index modulation (O-OFDM-IM) for visible light communications (VLC) systems employing light emitting diodes (LEDs) and photodetectors (PDs). The proposed scheme uses the indices of the active subcarriers of an optical OFDM system to transmit additional information bits. In the proposed scheme, the bipolar signals are asymmetrically clipped or DC biased and a log-likelihood ratio (LLR) calculation based detector is used to determine the indices of the active subcarriers. Our computer simulations show that the O-OFDM-IM achieves better error peformance compared to classical optical OFDM schemes.Conference Object Vlc Sparse Channel Estimation in the Presence of Non-Gaussian Clipping Noise(IEEE, 2016) Yeşilkaya, Anıl; Alsan, Hüseyin Fuat; Panayırcı, ErdalIn this paper a new computationally efficient and high performance channel estimation algorithm is proposed for the indoor visible light communication (VLC) sparse channels in the presence of a clipping noise. The clipping noise is modelled as a Gaussian mixture and a first time in the literature the matching pursuit (MP) and the space-alternating expectation-maximization (SAGE) algorithms are combined into the new estimation called the SAGE-MP algorithm for iteratively estimating the sparse channel coefficients as well as their positions efficiently. The MP algorithm is also employed to determine the initial values of the joint iterative algorithm. Computed simulations indicates that the SAGE-MP algorithm converge in 3 iterations at most and yields excellent bit error rate (BER) and mean-square error (MSE) performances for DC-biased optical OFDM (DCO-OFDM) based systems.Article Citation - WoS: 117Citation - Scopus: 150Physical-Layer Security in 6g Networks(IEEE-Inst Electrical Electronics Engineers Inc, 2021) Mucchi, Lorenzo; Jayousi, Sara; Caputo, Stefano; Panayırcı, Erdal; Shahabuddin, Shahriar; Bechtold, Jonathan; Morales, IvanThe sixth generation (6G) of mobile network will be composed by different nodes, from macro-devices (satellite) to nano-devices (sensors inside the human body), providing a full connectivity fabric all around us. These heterogeneous nodes constitute an ultra dense network managing tons of information, often very sensitive. To trust the services provided by such network, security is a mandatory feature by design. In this scenario, physical-layer security (PLS) can act as a first line of defense, providing security even to low-resourced nodes in different environments. This paper discusses challenges, solutions and visions of PLS in beyond-5G networks.Article Citation - WoS: 5Citation - Scopus: 5An Efficient Joint Channel Estimation and Decoding Algorithm for Turbo-Coded Space-Time Orthogonal Frequency Division Multiplexing Receivers(Inst Engineering Technology-IET, 2008) Doğan, Hakan; Çırpan, Hakan Ali; Panayırcı, ErdalThe 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 computationally feasible way. Without realising such a critical function perfectly at receiver the whole system will not work properly within the desired performance limits. Unfortunately direct implementation of such optimal algorithms is not possible mainly due to their mathematically intractable and computationally prohibitive nature. A novel algorithm that reaches the performance of the optimal maximum a posteriori (MAP) algorithm with a feasible computational complexity is proposed. The algorithm makes use of a powerful statistical signal processing tool called the expectation-maximisation (EM) technique. It iteratively executes the MAP joint channel estimation and decoding for space-time block-coded orthogonal frequency division multiplexing systems with turbo channel coding in the presence of unknown wireless dispersive channels. The main novelty of the work comes from the facts that the proposed algorithm estimates the channel in a non-data-aided fashion and therefore except a small number of pilot symbols required for initialisation no training sequence is necessary. Also the approach employs a convenient representation of the discrete multipath fading channel based on the Karhunen-Loeve (KL) orthogonal expansion and finds MAP estimates of the uncorrelated KL series expansion coefficients. Based on such an expansion no matrix inversion is required in the proposed MAP estimator. Moreover optimal rank reduction is achieved by exploiting the optimal truncation property of the KL expansion resulting in a smaller computational load on the iterative estimation approach.Conference Object An Efficient Sage-Based Data Detection Algorithm for Ofdm Systems in the Presence of Very Fast Fading Channels(IEEE, 2013) Dong, Zhicheng; Fan, Pingzhi; Panayırcı, ErdalIn 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) systems under fast fading channels. The proposed detector includes the original detector presented in [1] as one of its special cases. With a proper choice of its parameters simulations show that the new detector has negligible performance loss than original one in [1] with smaller number of iterations.Conference Object Citation - WoS: 2Citation - Scopus: 3Reliable Two-Path Successive Relaying(2013) Basar, Ertugrul; Aygölü, Ümit; Panayırcı, Erdal; Poor, H. VincentEmerging two-path successive relaying protocols generally rely on error-free source-relay channels and/or interference-free inter-relay channels to achieve high-rate and full-diversity. In this paper by removing these optimistic assumptions a novel two-path successive relaying scheme that benefits from relay selection and distributed space-time block coding (STBC) and transfers the data from the source to the destination via relays in a reliable fashion is proposed. The proposed scheme can achieve full diversity without the requirement of perfect decoding at relays since not only the destination but also the relays benefit from distributed STBC and relay selection. As the target STBC coordinate interleaved orthogonal design (CIOD) for two transmit antennas is considered. The average symbol error probability of the proposed scheme is derived and its error performance is compared with reference systems. © 2013 IEEE.
