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    Bit Error Rate Performance of MIMO-NOMA with Majority Based TAS/MRC Scheme in Nakagami-m Fading Channels
    (Institute of Electrical and Electronics Engineers Inc., 2022) Kumson, Princewill Kum; Russ, Rusul Al-Afah; Aldababsa, Mahmoud
    The inability of conventional orthogonal multiple access (OMA) techniques to guarantee a low latency rate, high spectral efficiency, massive device connectivity, and a better quality of service (QoS) led to the introduction of the non-orthogonal multiple access (NOMA) technique. Multiple-input multiple-output (MIMO) technologies can increase the capacity and decrease the error rate of wireless systems. Due to the advantages mentioned earlier, integrating NOMA and MIMO is indispensable in future wireless communication systems. In this context, this paper considers MIMO-NOMA networks, in which all nodes are equipped with multiple antennas. In the considered network, the majority-based transmit antenna selection and maximal ratio combining schemes are employed at the base station and users, respectively. Then, the bit error rate performance is investigated over Nakagami-m fading channels by Monte Carlo simulations. © 2022 IEEE.
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    Investigating the bit error rate performance of the mimo-noma network with majority-based TAS/MRC scheme
    (İstanbul Gelişim Üniversitesi Lisansüstü Eğitim Enstitüsü, 2023) Kumson, Princewill Kum
    This thesis focuses on examining the performance of downlink MIMO-NOMA networks using the TAS-maj/MRC technique. It addresses the limitations of previous studies and explores the advantages of combining NOMA and MIMO technologies. Previous research has mainly focused on evaluating SISO NOMA networks and has overlooked the error rate performance of MIMO-NOMA systems. Finding an optimal transmit AS solution remains a challenge in NOMA networks. To overcome these limitations, this thesis makes significant contributions. Firstly, it investigates the bit error rate (BER) performance of the downlink MIMO-NOMA network with the TAS-maj/MRC scheme under the Nakagami-m fading channel model. By considering the Nakagami-m fading model, which better represents real-world fading channel conditions, a more accurate assessment is achieved. The thesis provides an exact closed-form expression for the BER, offering insights into the system's performance. Additionally, asymptotic analysis is conducted in high signal-to-noise ratio (SNR) regions to evaluate the diversity and array gains achieved by the TAS-maj/MRC scheme. This analysis enhances our understanding of the system's behavior and the benefits of employing the TAS-maj/MRC scheme in MIMO-NOMA networks. Theoretical results are validated through extensive Monte Carlo simulations, demonstrating significant BER improvements with increasing receive antennas and improved channel conditions. The research findings contribute to a comprehensive understanding of the BER performance of MIMO-NOMA systems with the TAS-maj/MRC scheme under various channel conditions. This understanding is valuable for the design and optimization of practical wireless communication applications. By identifying the limitations of MIMO-NOMA systems and proposing strategies to enhance their performance, this research aims to advance wireless communication systems. The thesis structure is as follows: Chapter 1 provides an overview of OMA radio access techniques, introduces NOMA concepts in downlink and uplink networks, and discusses the emergence of MIMO-NOMA systems. Chapter 2 presents a literature review, analyzing previous research on MIMO-NOMA systems, emphasizing the need to investigate the error rate performance. Chapter 3 describes the theoretical framework of the MIMO-NOMA system with the TAS-maj/MRC scheme, including the Nakagami-m fading channel model, transmit AS schemes, and MRC on the receiver side. The derivation of the closed-form expression for the BER is explained in detail. Chapter 4 presents simulation results and analyzes the BER performance under different channel conditions. Various parameters, such as receive antennas and channel conditions, are examined through Monte-Carlo simulations, confirming the improvements in BER performance and validating the theoretical findings. Finally, We summarize the research findings, discuss the study's contributions, and suggest directions for future research. The summary highlights the significance of this research in bridging the gap between NOMA and MIMO technologies, exploring the benefits of the TAS-maj/MRC scheme in MIMO-NOMA networks, and providing insights into the system's behavior under different channel conditions.
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    Performance analysis of majority-based transmit antenna selection and maximal ratio combining in MIMO-NOMA networks
    (Springer Int Publ Ag, 2024) Kumson, Princewill Kum; Aldababsa, Mahmoud; Yahya, Khalid; Obaid, Mahmoud; Mwais, Allam Abu
    Non-orthogonal multiple access (NOMA) is paramount in modern wireless communication systems since it enables efficient multiple access schemes, allowing multiple users to share the same spectrum resources and thus improving overall network capacity. Multiple-input multiple-output (MIMO) technology is crucial in wireless communication as it leverages multiple antennas to enhance data throughput, increase link reliability, and mitigate signal interference, resulting in improved communication performance. The combination of MIMO and NOMA represents a transformative synergy that harnesses the benefits of both technologies, facilitating efficient spectrum utilization, higher data rates, and improved reliability in wireless networks. This makes it particularly valuable in the fifth-generation (5G) era and beyond. This paper investigates the performance of majority-based transmit antenna selection and maximal ratio combining (TAS-maj/MRC) in MIMO-NOMA networks. We derive a closed-form expression for the exact bit error rate (BER) for binary phase shift keying (BPSK) modulation in Nakagami-m fading channels. Moreover, asymptotic expressions are obtained in the high signal-to-noise ratio (SNR) region to get further insight into the BER behavior of the system. Finally, we verify the analytical results' accuracy through simulations. The results demonstrate that diversity and code gains are achieved. In addition, the BER performance is significantly improved as the number of receive antennas increases or channel condition enhances.