Detaylı Arama
İptal
Bulunan: 28 Adet 0.002 sn
- Eklemek veya çıkarmak istediğiniz kriterleriniz için 'Dahil' / 'Hariç' seçeneğini kullanabilirsiniz. Sorgu satırları birbirine 'VE' bağlacı ile bağlıdır.
- İptal tuşuna basarak normal aramaya dönebilirsiniz.
Filtreler
Filtreler
Bulunan: 28 Adet 0.002 sn
Koleksiyon : Elektrik ve Elektron ... ✕Tam Metin : var ✕
Koleksiyon [3]
İlgili Araştırmacılar [6]
Tam Metin [1]
Tür [2]
Yazar [7]
Alt Tür [1]
Alt Tür 1 [2]
Konu Başlıkları [20]
Açık Erişim Tarihi [1]
Tarih [6]
Dizin Platformu [4]
İsmi Geçen [8]
WOS Kategorileri [7]
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

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

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
Erişime Açık

A new fwht-cmf-dfe based approach for channel equalization in cp-free ofdm systems

Asuman SAVAŞÇIHABEŞ | Ali ÖZEN

Orthogonal frequency division multiplexing (OFDM) has been widely used in wireless communication systems due to its robustness against the frequency selectivity of fading channels. It provides optimal performance and it also meets the requirements of the next generation communication systems. Although OFDM has these advantages, its spectrum efficiency is usually degraded significantly due to the use of cyclic prefix (CP). In this paper, motivated to deal with this issue, the combined structure of Fast Walsh-Hadamard Transform (FWHT) and Time Domain Equalizer (TDE) is proposed to use in CP-free ...Daha fazlası

Makale/Derleme 2021 Iet Communications 6 Görüntülenme
Erişime Açık

İçortam Görünür Işık Haberleşme Kanallarında Güç Analizi

Asuman SAVAŞÇIHABEŞ

Optik kablosuz haberleşme teknolojisi, radyo frekansı iletişiminin önemli bir alternatifi olarak ortaya çıkmıştır. RF iletişimdeki bandgenişliğinin sınırlı olması nedeniyle, kullanıcıların yüksek hızlı kablosuz iletişim sistemlerine olan ihtiyacı artmaktadır. RF sisteminin kontrolsüz radyasyon, sınırlı bandgenişliği, düzenlenmiş frekans ve mobil kullanıcı sayısının artması gibi birtakım kısıtlamaları nedeniyle, RF tabanlı iletişim son yıllarda spektrum darlığı sorunuyla karşı karşıya kalmıştır. RF’ten farklı olarak görünür ışık haberleşmesi (VLC), iletim kanalları için görünür ışık spektrum ta ...Daha fazlası

Makale/Derleme 2021 EJOSAT 4 Görüntülenme
Erişime Açık

Analysis of soccer league competition algorithm for load frequency control in nonlinear ınterconnected power system

Ahmet DOĞAN

Load Frequency Control (LFC) is a significant tool that provides an equilibrium between generating and consuming real power for efficient operation of power system. In this paper, design and performance analysis of Soccer League Competition (SLC) algorithm is provided for optimal solution of LFC in nonlinear interconnected power systems. SLC algorithm has ability of escaping from local minimums while increasing searching capability accuracy with their operators. PID controller parameters are optimized in order to minimize Integral of Time multiplied Absolute Error (ITAE) as objective function. ...Daha fazlası

Makale/Derleme 2021 Journal of Engineering Sciences and Design 11 Görüntülenme
Erişime Açık

A novel concatenated lwt and wht based ufmc waveform design forthe next generation wireless communication systems

Ali ÖZEN | Asuman SAVAŞÇIHABEŞ

A novel concatenated Lifting Wavelet Transform (LWT) and Walsh Hadamard Transform (WHT) with Universal Filtered MultiCarrier (UFMC) waveform is suggested as an alternative to Orthogonal Frequency Division Multiplexing (OFDM) waveformfor the next generation wireless telecommunication systems in this paper. The suggested waveform is composed of LWT andWHT with UFMC waveform. Both the elimination the disadvantages of OFDM and the improvement the achievement of UFMCwaveform, from the fifth generation waveform candidates, has been aimed with the suggested waveform. In order to verify theperformance ...Daha fazlası

Makale/Derleme 2020 IEEJ Transactions on Electrical and Electronic Engineering 17 Görüntülenme
6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.
Tamam
creativecommons
Bu site altında yer alan tüm kaynaklar Creative Commons Alıntı-GayriTicari-Türetilemez 4.0 Uluslararası Lisansı ile lisanslanmıştır.
Platforms