ORCID Profile
0000-0002-0541-198X
Current Organisation
University of Nairobi
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Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
Date: 1997
Publisher: MDPI AG
Date: 09-10-2023
DOI: 10.3390/APP131911103
Publisher: IEEE
Date: 1999
Publisher: Engineering, Technology & Applied Science Research
Date: 16-08-2020
DOI: 10.48084/ETASR.3727
Abstract: The current trend has seen the data capacity and traffic density increase due to the increased demand for multimedia services. Since this cannot be handled successfully by the current 4G networks, there is a need to integrate the mmWave and the Device-to-Device (D2D) communication 5G technologies to meet this increased demand and traffic density. However, there is the challenge of increased interference between dense D2D users and cellular users if D2D users are allowed to reuse the resources allocated to cellular users. This degrades the performance of the D2D users in terms of achievable data rate and Energy Efficiency (EE). The paper formulates a match theoretic resource allocation scheme to maximize the achievable D2D sum rate. In addition, an EE optimization problem is formulated for D2D users by considering the rate and power constraints. The EE optimization problem is solved by the Lagrangian dual decomposition method. The algorithms were simulated in MATLAB and the results were compared to Hungarian and heuristic optimization algorithms. The results showed that the match theoretic resource allocation is on average 1.82 times better than the Hungarian algorithm. At the same time, the match theoretic resource allocation algorithm increases fairness in resource allocation as it maintains a higher sum rate for low and high-density number of users. The proposed EE optimization algorithm improved the D2D performance by 8.2% compared to the heuristic algorithm.
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
Date: 1999
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
Date: 1996
Publisher: Horizon Research Publishing Co., Ltd.
Date: 07-2019
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
Date: 1998
Publisher: Engineering and Technology Publishing
Date: 2021
DOI: 10.12720/JCM.16.7.259-266
Abstract: Intelligent Transport System (ITS) has emerged as the most probable technology for improved transport experience more so in environments with high vehicular density. Effective vehicular communication is however hindered by spectrum scarcity due to the already crowded licensed spectrum. This has led to the emergence of Cognitive Radio (CR) systems as a solution to the spectrum scarcity problem. A crucial component in CR is spectrum sensing. Various spectrum sensing techniques including Cyclostationary, Matched Filter, and Energy detection have been proposed and applied with varied outcomes. In this paper, the above mentioned detection techniques are discussed and an improved energy detection based cooperative spectrum sensing scheme is proposed for improved communication in vehicular ad hoc networks (VANET). The proposed scheme showed an improvement in the performance of a network which in turn could lead to more efficient utilization of spectrum.
Publisher: IEEE
Date: 09-2017
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
Date: 1997
Publisher: IEEE
Date: 09-2015
Location: Kenya
No related grants have been discovered for Heywood Absaloms.