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Bulunan: 51 Adet 0.002 sn
Koleksiyon : Mühendislik Fakültes ... ✕Tam Metin : var ✕
Koleksiyon [5]
İlgili Araştırmacılar [13]
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Yazar [14]
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Alt Tür 1 [2]
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Erişime Açık

QAM signaling over kappa - mu shadowed fading channels

Mehmet BİLİM

In this study, average symbol error rate (ASER) expressions for rectangular quadrature amplitude modulation (RQAM) and cross quadrature amplitude modulation (XQAM) over κ−μ shadowed fading are proposed by considering two different system models. In the first system model, a single-input– single-output (SISO) scheme is considered while a multiple-input–multiple-output (MIMO) with single transmit antenna selection and maximal ratio combining (TAS/MRC) is investigated as a second system model. First, the exact, approximate and asymptotic ASER expressions of RQAM and XQAM for a SISO system model a ...Daha fazlası

Makale/Derleme 2019 Elsevier 12 Görüntülenme
Erişime Açık

Application of best relay selection approach to cooperative DF IDMA systems over Rayleigh/Weibull fading channels

Mehmet BİLİM

This paper analyzes the performance of cooperative decode‐and‐forward (DF)interleave‐division multiple‐access (IDMA) networks with best relay selectionover Rayleigh/Weibull fading environments. In the analysis, approximate out-age probability (OP) and bit error probability (BEP) expressions are derivedfor the considered system. Further, a 2‐hop DF IDMA system is also designedto compare with cooperative one. We propose OP and BEP expression for 2‐hop DF IDMA systems. Numerical results are obtained by changing the num-ber of relays and the value of fading parameter in the proposed expressions.Al ...Daha fazlası

Makale/Derleme 2018 Wiley 5 Görüntülenme
Erişime Açık

Analysis of analytical capacity forFisher–SnedecorFfading channels withdifferent transmission schemes

Mehmet BİLİM

This Letter presents capacity analysis of Fisher–SnedecorFfadingchannels under different transmission strategies. To this end, novelanalytical expressions are proposed for optimal rate adaptation withconstant transmit power, channel inversion with afixed rate and trun-cated channel inversion withfixed rate schemes in this Letter. Then,analytical results are illustrated for different fading and shadowingparameter values.

Makale/Derleme 2019 IET 8 Görüntülenme
Erişime Açık

N-person grey game

Erkan KÖSE

Purpose – One important assumption in the conventional cooperative game theory is that payoffs are assumed to be deterministic. In terms of the players’ cognitive ability of the realistic world, this is a very strict assumption. The classical game theory can find no way out when a particular game circumstance involves uncertainty, such as limited knowledge, small sample, and inadequate information, the payoff values of the game can only be described with interval grey numbers. The paper aims to discuss these issues. Design/methodology/approach – In this study the concept of N-person grey games ...Daha fazlası

Makale/Derleme 2015 KYBERNETES 14 Görüntülenme
Erişime Açık

Project staff scheduling with theory of coalition

Oğuzhan Ahmet ARIK | Erkan KÖSE

Project scheduling has been still one of the hottest topics in the management area. The goal of traditional project management is to complete the project at the earliest possible time in accordance with the available resources without violating priority relations of the activities involved. Unlike traditional project management, this study deals with the possibility of a coalition among the staf available to accomplish tasks of the project. The tasks can be fulflled by more than one staf members. Staf’s coalition shortens the completion time of the tasks. A natural problem that arises in this ...Daha fazlası

Makale/Derleme 2019 GROUP DECISION AND NEGOTIATION 12 Görüntülenme
Erişime Açık

Locating unmanned aircraft systems for multiple missions under different weather conditions

Erkan KÖSE

Motivated by the increasing civilian use of Unmanned Aerial Vehicles (UAVs), this paper considers the simultaneous location and routing of UAVs for multiple missions and diferent weather conditions. We include modeling and computational experience inspired by requirements for air surveillance by the Turkish government’s public agencies. We model these demands in multiple mission areas and consider the impact of diferent weather conditions on the ability to employ UAVs from diferent geographic locations. We formulate the problem as a two-stage stochastic integer linear program with recourse and ...Daha fazlası

Makale/Derleme 2019 Operational Research 5 Görüntülenme
Erişime Açık

Sayısal modülasyonların ?-µ/gamma karma sönümlenmeli ortamlardaki hata olasılığı üzerine bir çalışma

Mehmet BİLİM

Bu çalışmada, evre uyumlu olmayan frekans kaydırmalı anahtarlama ve farksal faz kaydırmalı anahtarlama sayısal modülasyon türlerini kullanan haberleşme sistemlerinin η-µ/Gamma karma sönümlenmeli kanallardaki başarım analizi verilmiştir. Yapılan analiz olasılık yoğunluk fonksiyonu tabanlı olup, matematiksel olarak temel fonksiyonlar içermektedir. Bu sebeple, sunulan analiz matematiksel açıdan oldukça kolay ve anlaşılabilirdir. Yapılan analizler sonucunda kapalı formda ortalama hata ifadesi türetilmiştir. Türetilen hata ifadesi kullanılarak elde edilen nümerik sonuçlar ile simülasyon sonuçları k ...Daha fazlası

Makale/Derleme 2020 Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi 9 Görüntülenme
Erişime Açık

Effective throughput of alternate Rician shadowed fading links

Mehmet BİLİM

The performance of effective throughput (ET) over alternate Rician-shadowed fading channels is analyzed. A novel expressionfor the exact ET is obtained in terms of the Meijer’sGfunction. Moreover, an asymptotic ET expression at the high signal-to-noise ratio regime is also derived to gain more insight. In order to prove the correctness of our analytical derivations, somecomparisons between the exact simulations and numerical results are presented. The results demonstrate that increasing the valueofmshadowing fading is more dominant than the value ofKi(i∈{1, 2}) Rician parameters since this mea ...Daha fazlası

Makale/Derleme 2020 IEEJ Transactions on Electrical and Electronic Engineering 5 Görüntülenme
Erişime Açık

Uplink communications with awggn over non-homogeneous fading channels

Mehmet Bilim

In this paper, the performance of single-input-multiple-output (SIMO) networks which represented an uplink communication with additive generalized Gaussian noise (AWGGN) over non-homogeneous fading conditions such as – , – , and – are analyzed. First, approximate error probability ( ) expressions are presented for SIMO operating in – , – , and – fading channels by using the probability density functions (PDF) of the instantaneous signal-to-noise ratio at the receiver side. Then, the asymptotic expressions based on these PDF expressions are also derived. To these end, we show the performances f ...Daha fazlası

Makale/Derleme 2020 Physical Communication 9 Görüntülenme
Erişime Açık

Simple Assembly Line Balancing Problem of Type 1 with Grey Demand and Grey Task Durations

Oğuzhan Ahmet ARIK | Erkan KÖSE

Purpose – The purpose of this paper is to present a mixed integer programming model for simple assembly line balancing problems (SALBP) with Type 1 when the annual demand and task durations are uncertain and encoded with grey numbers. Design/methodology/approach – Grey theory and grey numbers are used for illustrating the uncertainty of parameters in an SALBP, where the objective is to minimize the total number of workstations. The paper proposes a 0-1 mathematical model for SALBP of Type 1 with grey demand and grey task durations. Findings – The uncertainty of the demand and task durations ar ...Daha fazlası

Makale/Derleme 2019 Grey Systems: Theory and Application 8 Görüntülenme
Erişime Açık

Load frequency control of two area and multi source power system using grey wolf optimization algorithm

Ahmet DOĞAN

In this study, load frequency of two area interconnected power systems are controlled based on Proportional Integral Derivative (PID) controller structures and gain parameters of controllers are decided using Grey Wolf Optimization (GWO) algorithm. Dynamic response of the proposed structure is investigated considering integral of time multiplied absolute error (ITEA) as cost function in a two area and multi source power system. Capability and efficiency of GWO algorithm is illustrated in comparison to Particle Swarm Optimization (PSO) and Artificial Bee colony (ABC). It is observed that GWO pr ...Daha fazlası

Bildiri 2019 11th International Conference On Electrical And Electronics Engineering (ELECO 2019) , pp. 8 - 84 9 Görüntülenme
Erişime Açık

A new PAPR and BER enhancement technique based on lifting wavelet transform and selected mapping method for the next generation waveforms

Asuman SAVAŞÇIHABEŞ | Ali ÖZEN

Orthogonal frequency division multiplexing (OFDM) is widely used in many digital communication systems because of its immunity to inter-symbol interference, high spectral efficiency and capability of handling multipath. Walsh-Hadamard transform (WHT) and discrete wavelet transform (DWT) have also been suggested in order to enhance the performances of multi-carrier wireless communication systems. In general, high peak-to-average power ratio (PAPR) is one of the biggest disadvantages of these systems and OFDM also has this disadvantage. Many techniques such as amplitude clipping and filtering, e ...Daha fazlası

Makale/Derleme 2021 AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 7 Görüntülenme
6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.
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