Browsing by Author "Uykan, Zekeriya"
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Analysis of "SIR" ("Signal"to"Interference"Ratio) in discretetime autonomous linear networks with symmetric weight matrices
Uykan, Zekeriya (IARIA, 200911)It’s wellknown that in a traditional discretetime autonomous linear systems, the eigenvalues of the weigth (system) matrix solely determine the stability of the system. If the spectral radius of the system matrix is ... 
Application of the SpecHybrid algorithm to text document clustering problem
Uykan, Zekeriya; Ganiz, Murat Can (IEEE, 201106)In this paper, we present a relaxed version of the SpecHybrid Algorithm originally proposed for wireless cellular systems, and apply it to text document clustering problem. We conduct several experiments on two different ... 
Composite vector quantization for optimizing antenna locations
Uykan, Zekeriya; Janttı, Riku (2018)In this paper, we study the location optimization problem of remote antenna units (RAUs) in generalized distributed antenna systems (GDASs). We propose a composite vector quantization (CVQ) algorithm that consists of ... 
Continuoustime Hopfield neural networkbased optimized solution to 2channel allocation problem
Uykan, Zekeriya (TÜBİTAK, 20150320)The channel allocation problem in cellular radio systems is NPcomplete, and thus its general solution is not known for even the 2channel case. It is well known that the link gain system matrix (or receivedsignal power ... 
ContinuoustimeHopfieldneural networkbased optimized solution to2channel allocation problem
Uykan, Zekeriya (2015)Abstract: The channel allocation problem in cellular radio systems is NPcomplete, and thus its general solution is not known for even the 2channel case. It is well known that the link gain system matrix (or receivedsignal ... 
A control engineering perspective to radio resource management challenges in emerging cellular/"noncellular" radio systems
Uykan, Zekeriya (IEEE, 2011)The technological evolution of the wireless cellular systems has been very rapid in last two decades. In the coming decade of "converging wireless networks/systems/ecosystems", there is an increasing demand on achieving ... 
Discrete  time hopfield neural network based text clustering algorithm
Uykan, Zekeriya; Ganiz, Murat Can; Şahinli, Çağla (Springer Verlag, 20121111)In this study we propose a discretetime Hopfield Neural Network based clustering algorithm for text clustering for cases L = 2(q) where L is the number of clusters and q is a positive integer. The optimum general solution ... 
Discrete pseudoSINRbalancing nonlinear recurrent system
Uykan, Zekeriya (Hindawi Publishing Corporation, 2013)Being inspired by the Hopfield neural networks (Hopfield (1982) and Hopfield and Tank (1985)) and the nonlinear sigmoid power control algorithm for cellular radio systems in Uykan and Koivo (2004), in this paper, we present ... 
Fast  convergent double  sigmoid hopfield neural network as applied to optimization problems
Uykan, Zekeriya (IEEE, 201306)The Hopfield neural network (HNN) has been widely used in numerous different optimization problems since the early 1980s. The convergence speed of the HNN (already in high gain) eventually plays a critical role in various ... 
Joint optimization of transmissionorder selection and channel allocation for bidirectional wireless linkspart I: game theoretic analysis
Uykan, Zekeriya; Jantti, Riku (IEEE, 201407)In this twopart paper, we consider a system consisting of bidirectional wireless links that interfere with each other, which has been the of focus of intensive research recently in emerging wireless systems like ... 
Joint optimization of transmissionorder selection and channel allocation for bidirectional wireless linkspart II: algorithms
Uykan, Zekeriya; Jantti, Riku (IEEE, 201407)This is the second in a twopart series of papers on transmission order (TO) optimization in the presence of channel allocation (CA), i.e., joint optimization of the TO selection and CA problem, for interfering bidirectional ... 
NGAIR: Nongreedy asynchronous interference reduction algorithm in wireless networks
Uykan, Zekeriya (Old City Publishing, 2014)In this paper, we consider optimum channel/frequency allocation problem in wireless networks by reducing total network interference signal powers, which is an NPcomplete problem. Its optimum solution for general wireless ... 
Spectral based solutions for (near) optimum channel/frequency allocation
Uykan, Zekeriya (IEEE, 2011)Optimum channel/frequency allocation problem in a general mobile radio networks is wellknown to be NPcomplete. The optimum general solution for a mobile radio network for even 2channel case is not known. In this paper, ... 
Stabilizing relaxed nonlinear fma yields a (combinatorial) optimizer
Uykan, Zekeriya (Springer Verlag, 2012)In this paper, we focus on socalled nonlinear and unfeasible FMA (FoschiniMiljanic Algorithm) case, where the system matrix is unfeasible and the transmit powers are limited. We stabilize the nonlinear dynamic system by ... 
Transmissionorder optimization for bidirectional devicetodevice (D2D) communications underlaying cellular TDD networks—A graph theoretic approach
Uykan, Zekeriya; Jantti, Riku (IEEE, 201601)Devicetodevice (D2D) communications underlaying cellular networks is a promising concept that has several advantages over the traditional cellular networks. In the TDD system, the frame structure defines the order of ... 
VBiCoMeS: A binary content addressable memory system
Uykan, Zekeriya (IEEE, 201110)In this paper, we present a novel binary content addressable memory system based on a variable structure concept. The stability of the proposed system is shown by a Lyapunov or energy function. As applied to the problem ...