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BAŞGÜMÜŞ, ARİF

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    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-9497-2015
    We 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.
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    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-9497-2015
    In 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.