A new step size control technique for blind and non-blind equalization algorithms

Ali Özen

A new variable step size (VSS) control technique employing cross correlation between channel output and error signal has been proposed as a solution to the problem of slow convergence of blind and non-blind equalization algorithms. The new method resolves the conflict between the convergence rate and low steady state error of the fixed step-size conventional blind and non-blind equalization algorithms, such as Constant Modulus Algorithm (CMA) and Least Mean Squares (LMS) algorithm. Computer simulations have been performed to verify the performance of the proposed method in frequency selective ...Daha fazlası

Makale/Derleme 2013 Radioengineering Journal 10 Görüntülenme

Yapay arı koloni algoritması üzerine kurulan yeni bir modülasyon tanıma yöntemi A new modulation recognition method based on artificial bee colony algorithm

Ali ÖZEN

Bu bildiride, toplanır beyaz Gauss gürültülü (Additive White Gaussian Noise, AWGN) kanala maruz kalmış temel bant sinyallerinin sınıflandırılması için yeni bir sayısal modülasyon tanıma yöntemi önerilmektedir. Önerilen yöntem (ABC-ANN), yapay arı koloni (Artificial Bee Colony, ABC) algoritması ile eğitilmiş yapay sinir ağları (Artificial Neural Networks, ANN) modelidir. ABC-ANN sınıflayıcıda alınan sinyallerin yüksek dereceli logaritmik momentlerinden yararlanılmaktadır ve yapay sinir ağlarının başarımını doğrudan etkileyen optimum ağırlık kümesinin bulunmasında ABC algoritması kullanılmaktadı ...Daha fazlası

Bildiri 2013 IEEE 21th Signal Processing and Communications Applications SIU 2013 , pp. 1 - 4 5 Görüntülenme

A novel modulation recognition technique based on artificial bee colony algorithm in the presence of multipath fading channels

Ali ÖZEN

In this paper, a novel automatic modulation recognition (AMR) method has been proposed for classifying of the transmitted signals by observing the received data samples in the presence of additive white Gaussian noise (AWGN) and multipath fading channel. The proposed method (ABC-ANN) is based on artificial neural network (ANN) which is trained by artificial bee colony (ABC) algorithm. Because high order statistics are very interesting features to solve the problem of AMR, the high order cumulants have been employed in the proposed ABC-ANN classifier. ABC algorithm is used in finding the optima ...Daha fazlası

Bildiri 2013 IEEE 36th International Conference on Telecommunications and Signal Processing, TSP 2013 , pp. 2 - 243 14 Görüntülenme

Hybrid tracking controller with attached tuned mass damper

Ali BOZER

The optimization of tuned mass damper (TMD) involves the attachment of a damper to a TMD unit. Although thissupplementary damping renders TMD to be operational under broad bandwidth inputs (i.e., wind excitation), italso considerably decreases the efficiency. In this paper, an alternative approach is suggested to eliminate therequirement for supplementary damping, hence to utilize TMD in full efficiency. For this purpose, combinedstructure/undamped TMD system is equipped with an active controller to track the response of an oscillatorwith natural frequency set to the operating frequency of the ...Daha fazlası

Makale/Derleme 2013 STRUCTURAL CONTROL & HEALTH MONITORING 18 Görüntülenme

Algebraic Current-voltage and Voltage Dependent Resistance Expressions for Ballistic Nano Conductors and Their Low Voltage Nonlinearity

Serhan YAMAÇLI

In this study, an algebraic current-voltage (I-V ) equation suitable for the hand-calculation of ballistic nano conductors is derived from Landauer’s formulation. A voltage and temperature dependent resistance expression is also obtained. It is shown that the presented algebraic I-V expression and the original Landauer’s formula give the same characteristics as expected. Moreover, the I-V characteristics of ballistic nano conductors are investigated and it is concluded that there is an inescapable nonlinearity originating from the curvature of Fermi-Dirac distribution function in low voltage r ...Daha fazlası

Makale/Derleme 2013 Nano-Micro Letters 16 Görüntülenme

Accurate SPICE compatible CNT interconnect and CNTFET models for circuit design and simulation

Serhan YAMAÇLI

SPICE compatible CNT interconnect and CNTFET models in Verilog-A hardware description language are presented in this paper. Metallic CNTs are shown to have current saturation characteristics above a threshold voltage and then modelled with piecewise linear functions. On the other hand, the CNTFET model developed utilizes the calculation of the self-consistent potential of the CNT channel depending on gate and drain voltages. Unlike the previous SPICE-enabled CNTFET models using approximations and curve fittings, the proposed model employs a self-consistent method for the calculation of the cha ...Daha fazlası

Makale/Derleme 2013 Mathematical and Computer Modelling 8 Görüntülenme

Null synthesis of time-modulated circular antenna arrays using an ımproved differential evolution algorithm

Kerim GÜNEY

An efficient variant of differential evolution (DE) algorithm, namely subpopulated differential evolution (subDE), is proposed for solving null synthesis problems of time-modulated circular antenna arrays by controlling time intervals and phases. The capabilities of subDE algorithm are examined by comparing its convergence curves and number of successful optimizations to those of the classical DE. Wilcoxon rank-sum test is also applied to ensure that the results are significant in terms of statistics. Furthermore, the antenna array parameters achieved by using subDE are compared to those of th ...Daha fazlası

Makale/Derleme 2013 Ieee Antennas And Wıreless Propagatıon Letters 9 Görüntülenme

Anfis Models For Synthesis Of Open Supported Coplanar Waveguides

Kerim GÜNEY

Simple and accurate models based on adaptive-network-based fuzzy inference system (ANFIS) to compute the physical dimensions of open supported coplanar waveguides are presented. The ANFIS is a class of adaptive networks which are functionally equivalent to fuzzy inference systems. Four optimization algorithms, hybrid learning, simulated annealing, least-squares, and genetic, are used to determine optimally the design parameters of the ANFIS. When the performances of ANFIS models are compared with each other, the best results are obtained from the ANFIS models trained by the hybrid learning alg ...Daha fazlası

Makale/Derleme 2013 Neural Network World 6 Görüntülenme

Bees algorithm for interference suppression of linear antenna arrays by controlling the positions of selected elements

Kerim GÜNEY

An efficient method based on bees algorithm (BA) for the pattern synthesis of linear antenna arrays with the prescribed nulls is presented. Nulling of the pattern is achieved by controlling only the positions of selected elements. The BA is an optimization algorithm inspired by the natural foraging behavior of honey bees to find the optimal solution. Simulation results for Chebyshev patterns with the imposed single and multiple nulls are given to show the effectiveness of the proposed method.

Makale/Derleme 2013 Journal Of Communıcatıons Technology And Electronıcs 6 Görüntülenme

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A new step size control technique for blind and non-blind equalization algorithms

Ali Özen

Yapay arı koloni algoritması üzerine kurulan yeni bir modülasyon tanıma yöntemi A new modulation recognition method based on artificial bee colony algorithm

Ali ÖZEN

A novel modulation recognition technique based on artificial bee colony algorithm in the presence of multipath fading channels

Ali ÖZEN

Hybrid tracking controller with attached tuned mass damper

Ali BOZER

Algebraic Current-voltage and Voltage Dependent Resistance Expressions for Ballistic Nano Conductors and Their Low Voltage Nonlinearity

Serhan YAMAÇLI

Accurate SPICE compatible CNT interconnect and CNTFET models for circuit design and simulation

Serhan YAMAÇLI

Null synthesis of time-modulated circular antenna arrays using an ımproved differential evolution algorithm

Kerim GÜNEY

Anfis Models For Synthesis Of Open Supported Coplanar Waveguides

Kerim GÜNEY

Bees algorithm for interference suppression of linear antenna arrays by controlling the positions of selected elements

Kerim GÜNEY