Yazar "Kapucu, Nuri" seçeneğine göre listele

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    Analysis of analytical capacity for Fisher-Snedecor F fading channels with different transmission schemes
    (Institution of Engineering and Technology, 2019) Kapucu, Nuri; Bilim, Mehmet
    This Letter presents capacity analysis of Fisher-Snedecor F fading channels under different transmission strategies. To this end, novel analytical expressions are proposed for optimal rate adaptation with constant transmit power, channel inversion with a fixed rate and truncated channel inversion with fixed rate schemes in this Letter. Then, analytical results are illustrated for different fading and shadowing parameter values. © The Institution of Engineering and Technology 2019
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    Average Symbol Error Rate Analysis of QAM Schemes Over Millimeter Wave Fluctuating Two-Ray Fading Channels
    (Ieee-Inst Electrical Electronics Engineers Inc, 2019) Bilim, Mehmet; Kapucu, Nuri
    In this study, analytical expressions are derived by using probability density function approach over millimeter wave fluctuating two-ray (FTR) fading channels for average symbol error rate (ASER) of rectangular quadrature amplitude modulation (RQAM) and cross quadrature amplitude modulation (XQAM) schemes. First, an exact ASER expression for RQAM over millimeter wave FTR fading channels is derived. Second, two different upper bound ASER expressions of RQAM scheme under millimeter wave FTR fading conditions are obtained by using Chernoff and Chiani approximations of Gaussian Q-function. In addition to this, an asymptotic ASER expression for RQAM is also proposed. Then, an analytical formulation is presented for XQAM signaling over millimeter wave FTR fading channels in terms of infinite series representations which rapidly converge. Finally, the numerical results of the proposed analytical expressions are compared with the simulation results in order to validate the analytical findings in this work.
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    Error Analysis of Dual-Branch SIMO Systems Over lambda - mu Fading Channels
    (Ieee, 2020) Bilim, Mehmet; Kapucu, Nuri
    In this work, error performance of dual-branch single-input multiple-output (SIMO) systems is analyzed over lambda-mu fading channels. An analytical expression is derived by using Chernoff approximation for the error probability of the considered system. Then, an asymptotic error expression is also proposed for the considered system. The results obtained from the derived expression are presented in comparison with exact results. Numerical results are shown for different configurations in order to analyze the effects of different values of fading parameter, antenna number and modulation type. In conclusion, it is observed that the approximate results are close to the exact results.
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    Error performance of digital modulations over Fisher-Snedecor F fading channels
    (Elsevier Gmbh, 2019) Kapucu, Nuri
    In this paper, symbol error probability (SEP) and the average symbol error rate (ASER) of digital modulation schemes are derived in the presence of Fisher-Snedecor F fading. First, an analytical SEP expression is proposed based on complementary cumulative distribution function (CDF) for M-ary phase shift keying (M-PSK) and M-ary pulse amplitude modulation (M-PAM). Then, an asymptotic solution is also presented for the SEP of M-PSK and M-PAM modulations in order to get more insights on the performance at high signal-to-noise ratio (SNR) regime. Finally, an exact ASER expression for rectangular quadrature amplitude modulation (RQAM) is derived and then, the ASER performance is analyzed based on two different upper bound approximations of Gaussian Q-function in Fisher-Snedecor F fading channels. The proposed expressions are not only valid for integer values of fading and shadowing parameters but also valid for non-integer values. The performance results which are in good agreement with the exact simulations are illustrated for different modulation schemes and various configurations of fading and shadowing parameters. (C) 2019 Elsevier GmbH. All rights reserved.
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    On the analysis of achievable rate for NOMA networks with cooperative users over kappa-mu shadowed fading channels
    (Wiley, 2019) Bilim, Mehmet; Kapucu, Nuri
    Cooperative nonorthogonal multiple access (NOMA) system is an effective solution for the fifth generation (5G) wireless mobile communications systems. In this work, the achievable rate analysis of a NOMA communication network with decode-and-forward (DF) relaying under kappa-mu shadowed fading conditions is investigated. First, we develop an analytical framework for cumulative distribution function (CDF) of the considered system model. Then, the average achievable rate expressions for two different information bits namely s(1) and s(2) are derived based on the derived CDF for NOMA with DF relaying over kappa-mu shadowed fading channels. Furthermore, we also propose simplified average achievable rate expressions for the special cases of kappa-mu shadowed fading channels in order to facilitate the evaluation of the derived expressions. Some numerical examples on the achievable rate of the considered system are shown for different scenarios. Moreover, our derived analytical average achievable rate expressions are confirmed by the simulations results.
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    On the performance of dual-branch selection diversity combining in alpha-kappa-mu fading environments
    (Wiley, 2019) Kapucu, Nuri
    In this paper, the performance of a dual-branch selection combining (SC) system is analyzed over alpha-kappa-mu fading channels. First, an outage probability (OP) expression is presented for a dual-branch diversity with the SC scheme in alpha-kappa-mu fading channels by using cumulative distribution function (CDF). By using the probability density function (PDF) and CDF of alpha-kappa-mu distribution, the PDF of total output instantaneous signal-to-noise ratio (SNR) is obtained which is subsequently utilized for the analysis of the considered system. Based on this PDF expression, bit error probability (BEP) expressions are derived with the use of a simple and tight upper bound approximation of Gaussian Q-function. In addition to these, we propose analytical effective capacity (EC) expressions for a dual-branch SC system under alpha-kappa-mu fading conditions. Then, we present simplified expressions for the OP, BEP, and EC at high SNR. Finally, we illustrate the OP, BEP (for binary phase shift keying and quadrature phase shift keying modulation formats), and EC performances for different configurations of alpha, kappa, and mu parameters. In order to validate our analytical results, comparisons between the exact simulations and analytical results are also provided.
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    ?-?-? Sönümlü Kanalların Efektif Kapasite Başarımı
    (2019) Kapucu, Nuri
    Bu çalışmada, ?-?-? sönümlü kanalların efektif kapasitesi için kapalı formda bir ifade türetilmiştir. Daha sonra ele alınan kanal modelinin efektif kapasitesi için asimptotik bir ifade de önerilmiştir. Buna ek olarak, türetilen ifadede bulunan sonsuz seri için kesme hatası incelemesi gerçekleştirilmiştir. Son olarak ise ?-?-? sönümlü kanalların efektif kapasite başarımı, farklı parametre değerleri için analitik sonuçlar elde edilerek benzetim sonuçları ile birlikte sunulmuştur.