Papers by Adedosu Adelabu
Unmanned system technologies, Oct 12, 2022
Mobile communication in Nigeria is plagued with unprecedented dropped calls, crosstalk, and servi... more Mobile communication in Nigeria is plagued with unprecedented dropped calls, crosstalk, and service unavailability even when the subscribers are credit-worthy. The reasons for such reprehensible observations are either due to natural causes, inadequate network infrastructure, or poor network design parameters. This paper examines the perturbation of mobile communications to ascertain probable causes. The various causes of impairment are examined. Different scenarios of mobile communications environment are presented. Test runs of the four mobile operators’ behavior from a rocky and non-rocky environment in Nigeria are presented. Finally, analysis of percentage call failures and observations are given.
Journal of Energy Technologies and Policy, 2017
The inverter performance model provides a new opportunity for accurately monitoring the performan... more The inverter performance model provides a new opportunity for accurately monitoring the performance and health of the inverter in real time. Grid-tied inverter monitoring can be accomplished by using a data acquisition system which provides a periodic measurement of dc voltage and power, as well as true ac power. In real time, inverter’s efficiency can be calculated empirically and compared to the inverter efficiency determined using the inverter performance model. Deviations between measured and calculated inverter efficiency would provide direct evidence of inverter malfunction or degradation in performance. It is likely, given experience, that the nature of the deviations would provide the diagnostic information needed to define required inverter maintenance for optimum future performance. Keywords: Performance model, Grid-tied Inverter monitoring, Data acquisition, Measured and calculated efficiency, Maintenance
Innovative Systems Design and Engineering, 2017
This paper presents three techniques for configuring, interfacing and networking of a wireless IP... more This paper presents three techniques for configuring, interfacing and networking of a wireless IP-based camera for real-time security surveillance systems design. The three different real-time implementation techniques proposed for configuring, interfacing and networking the IP camera are: 1). accessing the IP-based camera using the WANSCAM or XXCAM vendor software, 2). accessing the IP-based camera via Firefox® web browser , and 3). accessing the IP camera via MATLAB with SIMULINK on an internet ready system. The live streaming video based on the proposed techniques can be adapted for image detection, recognition and tracking for real-time intelligent security surveillance systems design. The paper also carried out a thorough comparative analysis of the three methods of achieving video streaming resulting from the output of the IP-based cameras. The analysis shows that the WANSCAM or XXCAM software displays the best video animations from the IP-based cameras when compared with the...
Computer Engineering and Intelligent Systems, 2015
This paper surveys the problem of the astronomical growing demand of Internet Systems participati... more This paper surveys the problem of the astronomical growing demand of Internet Systems participating in the public network which has led to the depletion of allocated Internet Protocol version 4.0 (IPV4) addresses. Already, four out of the Regional Internet Registry (RIR) namely: ARNIC, RIPE, LACNIC and ARPIN have exhausted their allocated IPV4 addresses while the fifth AFRICNIC (Africa's RIR) is reportedly depleted. We also examine the limitations of IPV4, the features of IPV6 and different modes of operating IPV6 standard. Findings shows that the current population of the world is over 6billion people with a projection of 9billion people by the year 2050 and IPV6 can conveniently accommodate 2 128 devices. This paper also proposes the migration from the present Internet Protocol version 4.0(IPV4) to a new Internet Protocol version 6.0(IPV6) addresses. This research work has shown that deploying the IPV6 could only be the possible solution to sustaining Internet Services globally.
Journal of Information Engineering and Applications, 2015
This paper analyses the problem of slow data or video streaming on the World Wide Web internet th... more This paper analyses the problem of slow data or video streaming on the World Wide Web internet through the network interface cards (NICs). The service of the entire network and internet connectivity largely rest on the installed Network Interface Cards (NICs). The performance of the various NICs such as 10Mbps, 100Mbps, 1,000Mbps and 10,000Mbps were examined using different message data sizes on the network. Also, the paper extensively discusses the performance of 10Gbps Ethernet card such as: data transmission time and throughput. The fact remained that the major backbone of the Internet network is the transmission control protocol (TCP) which is designed for reliable sending of data over the internet. The TCP as the protocol of the NIC is used for browsing web and downloading or uploading files. Additionally, the paper also examines the TCP feedback mechanism that is able to detect loss packets and retransmit them. Also, the TCP is able to dynamically adapt its packet sending rate to the network conditions in order to achieve the highest possible throughput. However, this paper proposes the use of the 10Gbps Ethernet card for the Internet Servers and Workstations for effective and fast internet access in all public networks.
Innovative Systems Design and Engineering, 2015
This paper addresses the solution to the problem of Internet Bandwidth optimization and predictio... more This paper addresses the solution to the problem of Internet Bandwidth optimization and prediction in the institution of higher learning in Nigeria. The operation of the link-load balancer which provides an efficient costeffective and easy-to-use solution to maximize utilization and availability of internet access is extensively discussed. This enables enterprises to lease for two or three ISP links connecting the internal network to the internet. The paper also proposes the application of the Langrage's method of interpolation for the predictability of internet bandwidth in the institutions. The analysis provides a unique graphical solution of effective actual bandwidth (Mbps) and the corresponding acceptable number of internet Users ('000) in the institutions. The prediction allows us to view the actual internet bandwidth and the acceptable number of internet Users as the population of users' increases.
Nigerian Journal of Technology, 2021
This paper introduces the Quasi-Moment-Method (QMM) as a novel radiowave propagation pathloss mod... more This paper introduces the Quasi-Moment-Method (QMM) as a novel radiowave propagation pathloss model calibration tool, and evaluates its performance, using field measurement data from different cellular mobile communication network sites in Benin City, Nigeria. The QMM recognizes the suitability of component parameters of existing basic models for the definition of ‘expansion’ and ‘testing functions’ in a Galerkin approach, and simulations were carried out with the use of a FORTRAN program developed by the authors, supported by matrix inversion in the MATLAB environment. Computational results reveal that in terms of both Root Mean Square (RMS) and Mean Prediction (MP) errors, QMM-calibrated models performed much better than an ‘optimum’ model reported for the NIFOR (Benin City), by a recent publication. As a matter of fact, the QMM-calibrated COST231 (rural area) model recorded reductions in RMS error of between 31.5% and 71% compared with corresponding metrics due to the aforementio...
2022 IEEE Nigeria 4th International Conference on Disruptive Technologies for Sustainable Development (NIGERCON)
Using a technique similar to Harrington’s method of moments, this paper develops a very simple ... more Using a technique similar to Harrington’s method of moments, this paper develops a very simple but remarkably efficient approach to the calibration of established (basic) mobile radio propagation pathloss models. First, the theoretical foundations of the process, here referred to as the ‘Quasi-Moment-Method (QMM)’, is succinctly presented. Thereafter, for validation purposes, pathloss predictions due to its use are compared with corresponding data reported in the open literature, for a model that derived from the application of the Adaptive Neuro-Fuzzy Inference System, ANFIS. Results of the comparisons reveal that the root-mean square error (RMSE) values for the QMM-models compare favorably with those reported for the more computationally involved ANFIS model; and that all the six QMM-calibrated models considered in the paper, provided better spread-correlated root-mean-square (SC-RMS) and standard deviation (SD) prediction errors. QMM cross-application prediction performan...
Alexandria Engineering Journal
Engineering Science and Technology, an International Journal, 2020
In wireless heterogeneous networks (HetNets), the spatial densification through small cells and t... more In wireless heterogeneous networks (HetNets), the spatial densification through small cells and the application of massive MIMO antenna arrays are key enablers for high data throughput, wider coverage, and improved energy efficiency (EE). However, ultra-dense deployment of small cells is envisioned to exacerbate network management and increase energy consumption in HetNets. To this end, this paper first identifies the peculiarities that make energy consumption one of the challenging problems in wireless communication networks. Further to this, we categorize the EE techniques used in wireless HetNets and discuss various enabling strategies under each technique. Based on these categories, an overview of past works carried out on EE techniques in HetNets is provided with reference to their major contributions and key findings. This work also presents EE metrics used to gauge energy consumption rate and performance trade-off. Finally, the paper concludes by discussing promising future research directions in the area of EE in Ultra-dense HetNets.
International Journal of Computer Applications, 2020
This paper investigates the pathloss prediction characteristics of basic models, subjected to cal... more This paper investigates the pathloss prediction characteristics of basic models, subjected to calibration with the use of a novel technique, here referred to as the Quasi-MomentMethod, QMM. After a succinct description of the QMM calibration process, the paper presents computational results involving the calibration of three different basic models-the SUI, ECC33, and Ericsson models. The results reveal that the QMM typically reduces mean prediction (MP) and root mean square (RMS) errors by several tens of decibels. One other novelty introduced by the paper, is a comparison of contributions to total predicted pathloss, by components of the basic models, and their corresponding QMM-calibrated versions. General Terms Wireless Communications, Radiowave Propagation, Empirical Modeling
Nigerian Journal of Technology, 2021
The introduction of electronic ballast in lighting systems design has dramatically revolutionized... more The introduction of electronic ballast in lighting systems design has dramatically revolutionized the lighting space. This is orchestrated by the entrance of the Compact Fluorescent Lamps (CFLs) and Light Emitting Diodes (LEDs) into the lighting market. The CFLs currently being used in domestic and industrial lighting systems provide highly competitive alternatives to conventional incandescent lamps. The electronic ballast incorporated into the CFLs helps eliminate the flickering and slow starting flaws prevalent in traditional fluorescent lamps. To properly evaluate the performance characteristics and limitations of the CFLs, a critical analysis of its electronic circuit becomes imperative. To this end, this paper presents experimental and simulation analyses of the CFL circuits. To achieve this, two Futina CFL bulbs of 11W and 15W model YPZ220/11-BMSP RR/RDD and YPZ220/15-BMSP RR/RDD, respectively, were analyzed and experimentally verified. A function-based programming paradigm wa...
Voice over Internet Protocol (VoIP) transmits packetized voice frames over a packet-switched (PS)... more Voice over Internet Protocol (VoIP) transmits packetized voice frames over a packet-switched (PS) network. In practice, data units may be delayed when a network carries more traffic than it can handle, leaving gaps within the audio segment. In this scenario, the receiving terminal cannot request the lost packets to be retransmitted since VoIP communication is real-time. For such gaps, except when a concealment technique is applied, an indeterminate silence period may occur, giving an impression that the call has been terminated. The usual technique for addressing this problem is to synthetically regenerate the lost packet by estimating the waveform of the original signal such that the person who listens does not notice the noise. Earlier works based on pitch waveform replication, pattern matching, and phase matching reported good performances. However, their perceived regenerated signal quality deteriorates severely with an increased duration of packet loss, reflecting a lack of con...
Telecom
Radio frequency interference (RFI) constitutes a significant problem in achieving a good quality ... more Radio frequency interference (RFI) constitutes a significant problem in achieving a good quality of service in radio links. Several techniques have been proposed to identify and mitigate RFI in wireless networks. However, most of these techniques are not generalized for all propagation environments due to varying geographical features from one environment to another. The need for extensive frequency scan measurements on the links to identify the available channels, evaluate the performances of the links, and detect RFI in the channels becomes imperative. This study presents a performance evaluation of frequency scan measurements from active microwave links comprising eighteen base stations. The measurements equipment included a spectrum analyzer and a 0.6 m antenna dish. The frequency scans were taken at 6 GHz, 7 GHz, and 8 GHz with full azimuth coverage of the horizontal and vertical polarization. Measured data were processed to determine the available frequencies and RFI in the ch...
Using a technique similar to Harrington's method of moments, this paper develops a very simpl... more Using a technique similar to Harrington's method of moments, this paper develops a very simple but remarkably efficient approach to the calibration of established (basic) mobile radio propagation pathloss models. First, the theoretical foundations of the process, here referred to as the 'Quasi-Moment-Method (QMM)', is succinctly presented. Thereafter, for validation purposes, pathloss predictions due to its use are compared with corresponding data reported in the open literature, for a model that derived from the application of the Adaptive Neuro-Fuzzy Inference System, ANFIS. Results of the comparisons reveal that the root-mean square error (RMSE) values for the QMM-models compare favorably with those reported for the more computationally involved ANFIS model; and that all the six QMM-calibrated models considered in the paper, provided better spread-correlated root-mean-square (SC-RMS) and standard deviation (SD) prediction errors. QMM cross-application prediction perfo...
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Papers by Adedosu Adelabu