Browsing by Author "Tiamiyu, O. A."

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    Maximizing the achievable-rate of a busy spectrum in a dynamic licensed shared access.
    (University of Ibadan, 2021) Ibironke, E. S.; Onidare,, S. O.; Tiamiyu, O. A.; Ajayi, O. T.; Ayeni, A. A.
    During the period when the spectrum is referred to as ‘busy’ in a dynamic licensed shared access system, there is a notable reduction in the maximum data rate that can be achieved by the licensee’s system as a result of the imposition of the incumbent's interference threshold constraint on the licensee’s system operation. To solve this problem, a power allocation technique that optimizes the licensee’s sum-rate without adversely affecting the incumbent’s operation is proposed in this paper. We begin by solving a sum-rate maximization problem subject to the incumbent’s interference threshold constraint. Using the Lagrangian method, an optimal power allocation model is derived from the formulated convex optimization problem. When compared to a non-optimized system, results obtained from simulations show a remarkable improvement in the achievable sum-rate of the licensee system under the proposed optimal power allocation model. The results further show that at low transmit power, the proposed optimal power allocation scheme is better for smaller number of users, while the size of the cell radius does not significantly affect the sum-rate gain of the proposed scheme.
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    Optical Compensation Using Different Modulation Formats
    (Ladoke Akintola University, Ogbomosho, 2021) Ibironke, E. S.; Onidare, S. O.; Tiamiyu, O. A.; Ajayi, O. T.; Ayeni, A. A.
    Optical dispersion is the main impediment to optimal utilization of optical fiber backbone ability to satisfy the capacity need of today’s emerging telecommunication networks. In this paper, the investigation of post - and symmetrical dispersion compensation fibers (DCF) have been examined in a 16 and 32 channel 40Gbps dense wavelength division multiplexing (DWDM) system using different modulation formats. Simulation results obtained show a significant improvement in the quality factor and bit error rate when DCF is used. The performance of the methods however shows dependency on the number of channels in the system, the modulation, and the channel condition.