Person: BAŞGÜMÜŞ, ARİF
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BAŞGÜMÜŞ
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ARİF
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Publication UAV-assisted cooperative NOMA system with the nth Best Relay Selection(Univ Suceava, 2023-08-01) Umakoğlu, İnci; Namdar, Mustafa; Başgümüş, Arif; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Elektrik-Elektronik Mühendisliği Bölümü.; 0000-0002-0611-3220; E-9497-2015We propose a downlink non-orthogonal multiple access (NOMA) architecture with a source, N one-way unmanned aerial vehicle (UAV) relays, and K destination users where the amplify-and-forward protocol is considered with the partial relay selection strategy. Then, we derive closed-form expressions for the bit error probability (BEP) of the NOMA users over the Rayleigh fading channel. This research investigated the selection of the nth best available UAV relay while presenting the bit error rate (BER) performance of a NOMA system. In addition, we analyze the diversity order and develop an asymptotic closed-form expression of the BEP in the high signal-to-noise ratio regime. To verify the accuracy of the analytical study of BER, numerical results are also provided taking into account the number of UAV relays, path loss exponent, power allocation coefficient, and channel gains. Finally, we validate that the simulation results precisely match our proposed theoretical analysis.Publication BER performance analysis for downlink NOMA systems over cascaded Nakagami-m fading channels(Springer Int Publ Ag, 2023-11-24) Koçak, Fatih; Namdar, Mustafa; Başgümüş, Arif; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Elektrik ve Elektronik Mühendisliği Bölümü.; 0000-0002-0611-3220; E-9497-2015In this study, the downlink non-orthogonal multiple access (NOMA) system in which successive interference cancellation (SIC) errors exist is discussed. The new closed-form expressions for the bit error rate (BER) performance analysis over cascaded Nakagami-m fading channels are analytically derived for near and far users. In addition, new mathematical equations are obtained for the asymptotic BER as well as the diversity order to analyze the system performance. The theoretical results precisely match the simulations in all cases, validating the effectiveness of the theoretical analysis. The results demonstrate that the system performance decreases as the degree of N cascading increases. As for a fixed degree of cascading, BER performance increases as the m parameter increases. Moreover, for the power allocation coefficient alpha influences the SIC operation performed on the near user, it also substantially affects the BER performance. Monte Carlo simulations using 10(6) iterations are presented to validate the derived analytical results.Publication Irs-aided communication systems in the presence of multiple eavesdroppers(Ieee, 2023-01-01) Namdar, Mustafa; Alakoca, Hakan; Ata, Serdar Özgür; Durak-Ata, Lütfiye; Basgümüş, Arif; BAŞGÜMÜŞ, ARİF; 0000-0002-0611-3220; 0000-0002-4368-2967; E-9497-2015; IWV-3354-2023; I-1158-2016; AAC-4912-2020In this study, the performance analysis of secrecy capacity and secrecy outage probability in the presence of multiple eavesdroppers that cooperate (colluding) and do not cooperate (non-colluding) with each other, respectively, is studied for the intelligent reflective surfaces (IRS) assisted communication system model in urban wireless networks. In both approaches, realistic security problems and solutions regarding the system model related to physical layer security for legitimate users, designed with the help of the IRS, are evaluated.Publication Ber performance analysis for noma systems with otfs modulation(Ieee, 2023-01-01) Umakoğlu, İnci; Namdar, Mustafa; Özyurt, Serdar; Kulaç, Selman; Başgümüş, Arif; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Elektrik ve Elektronik Mühendisliği Bölümü.; 0000-0002-0611-3220; 0000-0002-7737-1569; JFJ-2682-2023; KWU-5570-2024; E-9497-2015; I-1158-2016This study examines the non-orthogonal multiple access (NOMA) system that is modulated with orthogonal time-frequency-space (OTFS), which is a potential waveform candidate that is frequently used in sixth-generation (6G) wireless communication networks and is shown to improve performance in high mobility scenarios. In the proposed OTFS modulated NOMA system, bit error rate performance for near and far users is presented with the help of the message passing detection algorithm.Publication Ergodic capacity estimation with artificial neural networks in noma-based cognitive radio systems(Springer Heidelberg, 2023-09-21) Namdar, Mustafa; Güney, Abdulkadir; Bardak, Fatma Kebire; Basgümüş, Arif; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Elektrik ve Elektronik Mühendisliği Bölümü.; E-9497-2015The aim of this study is to predict the total ergodic capacity of near users in a cognitive radio (CR)-based non-orthogonal multiple access (NOMA) system model using the proposed artificial neural network (ANN) architecture. The input dataset used in this study was collected from the CR-NOMA system model and consists of the path loss coefficient, power allocation coefficient, signal-to-noise ratio, the distance between the source-relay-destination, and the ratio of the power of the secondary user to that of the primary user. Using a supervised learning method, the output data are trained and input into the ANN to estimate the ergodic capacity of nearby users using test data. The trained system model demonstrates an accuracy of 96.43% for training data, 96.34% for validation data, and 95.66% for test data when estimating the total ergodic capacity.Publication Metasurface manipulation attacks: Potential security threats of ris-aided 6g communications(IEEE-inst Electrical Electronics Engineers Inc, 2023-01-01) Alakoca, Hakan; Namdar, Mustafa; Aldırmaz-Çolak, Sultan; Başaran, Mehmet; Başgümüş, Arif; Durak-Ata, Lütfiye; Yanıkomeroğlu, Halim; BAŞGÜMÜŞ, ARİF; Bursa Uludağ Üniversitesi; E-9497-2015The physical layer security (PLS) of reconfigurable intelligent surfaces (RIS) is critical for providing secure and reliable communications in sixth generation (6G) wireless systems. This article contributes to a debate on many aspects of unique vulnerabilities that can arise in the PLS of RIS with malicious attacks on signal processing (SP) in 6G networks. We address and categorize future security threats in RIS-aided networks considering PLS aspects. Metasurface manipulation attacks (MSMA) are based on manipulating metasurface behavior for malicious purposes. In this study, we present the potential hostile activities of MSMA considering the impact of electromagnetic and time-frequency deterioration. In addition, we evaluate various interference-based MSMA and eavesdropping booster-based MSMA (EaB-MSMA), which are novel potential PLS attacks that involve manipulating phase shifting activity with SP on malicious RIS. We also compare performance degradation in the presence of hostile interference-based MSMA through the manipulation of maliciously configured RIS. Additionally, in the EaB-MSMA case, the loss of secrecy capacity is shown to be considerably greater in passive eavesdropping scenarios.