Browsing by Author "Yalcinkaya, Bengisu"
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
Conference Object Citation Count: 2An Experimental Study on the Influence of Human Movement in Indoor Radio Channel at 28GHz(Ieee, 2021) Benzaghta, Mohamed; Gökdoğan, Bengisu Yalçınkaya; Coruk, Remziye Busra; Yalcinkaya, Bengisu; Çoruk, Remziye Büşra; Kara, Ali; Electrical-Electronics Engineering; Department of Electrical & Electronics EngineeringHuman activities around the communication link in an indoor environment have a significant impact on millimeter-wave (mmWave) communication systems, which are used for the new generation of communication networks (5G). Therefore, it is essential to evaluate short range indoor links from the link blockage point of view. This paper presents the propagation measurements in the presence of human activity, for a short range indoor office environment communication link at 28 GHz. During the experimental measurements, the human activity of three and six persons were observed for three different antenna height combinations. The human blockage (shadowing effect) is characterized in terms of the shadowing event duration, temporal fading, as well as overall attenuation. The results reported by this experimental study is believed to be vital in designing future mmWave communication systems that can overcome the deep fades caused by human blockage in short indoor communication links. Yet, this paper constitutes a part of an ongoing research study, further detailed results will be foreseen to present the precise effect of human movements around the propagation link at 28GHz.Article Citation Count: 0Hierarchical Classification of Analog and Digital Modulation Schemes Using Higher-Order Statistics and Support Vector Machines(Springer, 2024) Gökdoğan, Bengisu Yalçınkaya; Coruk, Remziye Busra; Çoruk, Remziye Büşra; Kara, Ali; Tora, Hakan; Electrical-Electronics Engineering; Airframe and Powerplant Maintenance; Department of Electrical & Electronics EngineeringAutomatic modulation classification (AMC) algorithms are crucial for various military and commercial applications. There have been numerous AMC algorithms reported in the literature, most of which focus on synthetic signals with a limited number of modulation types having distinctive constellations. The efficient classification of high-order modulation schemes under real propagation effects using models with low complexity still remains difficult. In this paper, employing quadratic SVM, a feature-based hierarchical classification method is proposed to accurately classify especially higher-order modulation schemes and its performance is investigated using over the air (OTA) collected data. Statistical features, higher-order moments, and higher-order cumulants are utilized as features. Then, the performances of some well-known classifiers are evaluated, and the classifier presenting the best performance is employed in the proposed hierarchical classification model. An OTA dataset containing 17 analog and digital modulation schemes is used to assess the performance of the proposed classification model. With the proposed hierarchical classification algorithm, a significant improvement has been achieved, especially in higher-order modulation schemes. The overall accuracy with the proposed hierarchical structure is 96% after 5 dB signal-to-noise ratio value, approximately a 10% increase is achieved compared to the traditional classification algorithm.Article Citation Count: 5On the design and effectiveness of Simulink-based educational material for a communication systems course(Wiley, 2020) Coruk, R. Busra; Gökdoğan, Bengisu Yalçınkaya; Yalcinkaya, Bengisu; Kara, Ali; Kara, Ali; Electrical-Electronics Engineering; Department of Electrical & Electronics EngineeringThe methods used in engineering education have gained diversity in parallel with rapidly evolving technology. New technological methods along with the traditional methods have been adopted for undergraduate education. Today, Simulink-based educational materials are used in many fields in engineering education. However, in the literature, the contribution of such educational materials to the learning process has not been measured thoroughly. This study presents a comprehensive measurement method to improve the created course material and show the effectiveness of developed course material in students' success. First, educational material was developed for an undergraduate electrical engineering course: communication systems. A feedback group made up of diverse student learners was employed extensively in the material development phase. Next, the impact of the developed material on the success of the students was examined using both qualitative and quantitative measurement tools including questionnaires, one-to-one interviews, and class and university level anonymous surveys. This also included students' performance regarding laboratory quizzes and achievement of course learning outcomes. Overall, the measurement results show that the course material increased students' success in the course. Moreover, students' general perception of the course material was positive.