Browsing by Author "Ahmmed, Rubab"

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Assessing the Performance of a Hybrid Geolocation Algorithm Integrating FP and TOA Techniques Across Diverse Environmental Conditions
(Tuijin Jishu/Journal of Propulsion Technology, 2023-10-30) Kabir, Md. Humayun; Kabir, Md. Alomgir; Ahmmed, Rubab; Rahman, Md. Saidur
This paper presents a validation study of indoor geolocation accuracies using a hybrid approach that combines fingerprinting (FP) and time of arrival (TOA) techniques. The investigation focuses on three dense environments, examining the influence of furniture density and multipath components on geolocation accuracy, particularly in non-line-of-sight (NLOS) scenarios. The results indicate that geolocation performance improves in denser environments with higher furniture density due to increased multipath components. Additionally, optimizing the hybrid method with a polygon size of 50 cm and sampling rate of 80 GHz leads to further accuracy enhancements. These findings underscore the significance of furniture density and demonstrate the effectiveness of the hybrid method in addressing NLOS challenges. The research contributes to the advancement of indoor geolocation techniques and provides valuable insights for designing precise indoor positioning systems across various applications.
Performance Analysis of MIMO NOMA based Wireless Network for 5G and beyond under Rayleigh Fading Channel
(IEEE TENCON 2023 (TENCON is a flagship conference of IEEE Region 10 (Asia-Pacific)), Chiang Mai, Thailand, 2023-10-31) Ahmmed, Rubab; Kabir, Md. Humayun
The amalgamation of Multiple-Input Multiple-Output (MIMO) and Non-Orthogonal Multiple Access (NOMA) technologies emerges as a triumphant remedy to the challenges posed by the 5G cellular system and its futuristic counterparts. In this groundbreaking research endeavor, we embark on a journey to unravel the secrets concealed within the intricate fabric of wireless networks operating under the spellbinding influence of a Rayleigh fading channel. With relentless determination, we decipher the mystifying equations that yield the elusive closed-form expression for outage capacity and the probability equation for Down Link (DL) NOMA. Beyond the realms of 5G, our quest transcends to the uncharted territory of 6G wireless technology, where we dare to explore the impact of dynamic bandwidth variations. Venturing further, we delve into the depths of system performance evaluation, traversing the treacherous landscape of Bit Error Rate (BER), to shed light on the prowess of 5G and its evolutionary successors.
Performance Optimization of MIMO-NOMA Systems in Nakagami-m Fading Environments
(TELKOMNIKA (Telecommunication, Computing, Electronics and Control), 2025-06-01) Kabir, Md. Humayun; Ahmmed, Rubab; Kabir, Md. Alomgir; Tarfi, Kasira Tut
In this context, the utilization of multiple-input multiple-output (MIMO) and non-orthogonal multiple access (NOMA) technologies is applied to improve wireless communication. This paper is dedicated to the evaluation of the performance in the MIMO-NOMA system under Nakagami-m fading environments, which is a more general scenario for different kinds of fading conditions that occur normally. Our proposed framework is applied to evaluate key performance metrics, including bit error rate (BER), outage probability, spectral efficiency, and ergodic capacity. The results reveal the deep impact of Nakagami-m fading on these key performance metrics, emphasizing an intricate balance between reliability and spectral efficiency that is achieved through power domain multiplexing in conjunction with successive interference cancellation (SIC). Our results are further evidence of the strength and flexibility of MIMO-NOMA, and point to insights and practical guidelines that are new towards the optimization of next-generation wireless networks. This overall analysis not only closes the gap in current literature on the subject but also sets a new benchmark for future research on advanced communication technologies