Telecommunication Engineering

Permanent URI for this collectionhttp://repository.futminna.edu.ng:4000/handle/123456789/752

Telecommunication Engineering

Browse

Start date: 2012End date: 2019

Search Results

Now showing 1 - 8 of 8
  • No Thumbnail Available
    Item
    An Improved Rain Activated Automatic Window
    (Biennial Engineering Conference, School of Engineering and Engineering Technology (SEET), 2013) Oyewobi S. Stephen; Okwori M; Achonu A. O; Waheed A. M
    Meteorological conditions like temperature, wind, clouds, and precipitation (rainfall) influence the condition of comfort inside a house, especially through wind doors and windows; hence the need for proper control activator (either to is close aimed or at open) having of window control made convenient to home owners by the use of a switch to open windows in a an improved automatic window with rain or close the window. The design was conceived after observing the stress mechanical windows give us in our control of it to let air and light come into the house; therefore, advancement in electronics technology was used to design this automatic window. However, unlike existing automatic windows, a rain sensor has been included in this work to help shut the window automatically when rain is falling. To achieve this, a moisture sensor is incorporated in the design to sense rainfall, a forward and reversing DC Motor to move the window pane back and forth, a bistable circuit to control the movement of the DC Motor and a power supply to power the system.The design of ble circult to control work effectively in convenient control of windows for the comfort of the homes and in protecting the homes from rainfall. Keywords: Automatic window, rain activator, mechanical window, electronics, DC motor.
  • No Thumbnail Available
    Item
    An Improved GSM Technology-Based Microcontroller Multi-Sensor Home Security and Monitoring System
    (International Engineering Conference (IEC), School of Engineering and Engineering Technology (SEET), 2015) Oyewobi S. Stephen; M. Okwori; E. U. Mpkuma; W. M. Audu
    With increasing rate of crime all over the world, and with no pointer to this rate of crime abating anytime soon, home security has now become a major concern. Therefore most people; rich or poor are taking measures from highly sophisticated to very crude methods to prevent intrusion. This work presents a GSM technology-based home security and monitoring system. However, unlike the traditional magnetic switch alarms equipped on doors and windows, this system has incorporated a fire detector, a motion sensor and a moisture (rainfall) sensor. On any attempt of a break in, rainfall or possible smoke or fire a short message service (SMS) is sent to the house owner. The system is built using a programmed microcontroller interfaced with mobile phone (NOKIA 1209) such that the three major buttons of the mobile phone are switched at intervals to send a message to the owner of the house anytime there is an intruder, rainfall or fire accident. The system was tested and it worked on attempt of intrusion, rainfall (water) and smoke.
  • No Thumbnail Available
    Item
    Performance of the Recursive One-Sided Hypothesis Testing Technique under varying Signal to Noise Ratio Conditions in Cognitive Radio
    (Conference on Global and Emerging Trends (ICGET), 2018) JO Okonkwo; AJ Onumanyi; BA Salihu; HB Salau; Oyewobi S. Stephen
    The recursive one-sided hypothesis testing technique (ROHT) is one example of an adaptive threshold estimation technique for energy detection in cognitive radio. In this paper, a preliminary study of the ROHT algorithm is carried out to examine the effect of varying SNR conditions on the performance limit of the algorithm
  • No Thumbnail Available
    Item
    Optimized Forward Consecutive Mean Excision Algorithm for Adaptive Threshold Estimation in the Energy Detector
    (International Conference on Global and Emerging Trends (ICGET), 2018) H Abdullahi; AJ Onumanyi; S Zubair; HB Salau; H Ohize; Oyewobi S. Stephen
    In this paper, we provide a new model for optimizing the parameters of the FCME algorithm for autonomous threshold estimation in cognitive radio . our new model ensure that FCME is made capable of autonomously adjusting its parameters value based on the cuckoo search optimization algorithm
  • No Thumbnail Available
    Item
    Conservation of Mobile Terminal’s Battery Life Using Dynamic Power Control Algorithm
    (SAP, Journal of Wireless Networking and Communications, 2012) Oyewobi S. Stephen; Elizabeth N. Onwuka
    Most of our activities today are tied around being able to make a call or connect to the Internet with our Mobile devices. However, to optimally utilize the network and deliver the needed satisfaction to the user the mobile device needs to be powered. Sadly most mobile devices are powered by energy-limited batteries, which impose a constraint on the mobile terminal optimal performance and on the network utility. As a result, special emphasis is now being laid on extending the battery life of mobile devices. In this work, we present a simple and effective power control algorithm, which conserves battery power by dynamically responding to real-time network conditions to adjust mobile terminal’s transmit power. BER (bit error rate) in measurement reports obtained from signals received from the mobile terminal were used to estimate signal quality that helps to determine the network conditions and adjust mobile terminal’s transmit power accordingly. Our algorithm was tested using simulation models, and our results were compared with the Stepwise algorithm, which is a popular power control algorithm in literature. A reasonable improvement was recorded for length of operation time and battery-energy saved for the mobile terminal over stepwise algorithm.
  • No Thumbnail Available
    Item
    Polynomial based Channel Estimation Technique with Sliding Window for M-QAM Systems
    (The Science and Information Organisation, International Journal of Advanced Computer Science and Applications, 2016) O. O. Ogundile; M. O. Oloyede; F. A. Aina; Oyewobi S. Stephen
    Symbol Assisted Modulation (PSAM) channel estimation techniques over Rayleigh fading channels have been analysed in recent years. Fluctuations in the Rayleigh fading channel gain degrades the performance of any modulation scheme. This paper develops and analyses a PSAM Polynomial interpolation technique based on Least Square (LS) approximations to estimate the Channel State Information (CSI) for M-ary Quadrature Amplitude Modulation (M-QAM) over flat Rayleigh fading channels. A Sliding window approach with pilot symbol adjustment is employed in order to minimize the computational time complexity of the estimation technique. The channel estimation performance, and its computational delay and time complexity is verified for different Doppler frequencies ( fd), frame lengths (L), and Polynomial orders (P-orders). Simulation results show that the Cubic Polynomial interpolation gives superior Symbol Error Rate (SER) performance than the Quadratic Polynomial interpolation and higher P-orders, and the performance of the Polynomial estimation techniques degrade with increase in the P-orders
  • No Thumbnail Available
    Item
    A survey of cognitive radio handoff schemes, challenges and issues for industrial wireless sensor networks
    (Elsevier, Journal of Network and Computer Applications, 2017-08-25) Oyewobi S. Stephen; Gerhard Hancke
    Industrial wireless sensor network (IWSN) applications are mostly time-bound, mission-critical and highly delay sensitive applications therefore IWSN defines strict, stringent and unique QoS requirements such as timeliness, reliability and availability. In IWSN, unlike other sensor networks, late arrival of packets or delay or disruption to an on-going communication are considered as critical failure. Also, because IWSN is deployed in the overcrowded industrial, scientific, and medical (ISM) band it is difficult to meet this unique QoS requirements due to stiff competition for bandwidth from other technologies operating in ISM band resulting in scarcity of spectrum for reliable communication and/or disruption of ongoing communication. However, cognitive radio (CR) provides more spectral opportunities through opportunistic-use of unused licensed spectrum while ensuring minimal interference to licensed users. Similarly, spectrum handoff, which is a new type of handoff in cognitive radio, has the potential to offer increase bandwidth, reliable, smooth and interference-free communication for IWSNs through opportunistic-use of spectrum, minimal switching-delays, and efficient target channel selection strategies as well as effective link recovery maintenance. As a result, a new paradigm known as cognitive radio industrial wireless sensor network (CR-IWSN) has become the interest of recent research efforts. In this paper, we highlight and discuss important QoS requirements of IWSN as well as efforts of existing IWSN standards to address the challenges. We discuss the potential and how cognitive radio and spectrum handoff can be useful in the attempt to provide real-time reliable and smooth communication for IWSNs.
  • No Thumbnail Available
    Item
    Survey of Cellular Signal Booster
    (Mecs, Information Engineering and Electronic Business, 2018-11-08) Michael Okwori; Salihu O. Aliyu; Oyewobi S. Stephen; Caroline Alenoghena; Habeeb Bello-Salau; Sani S. Makusidi; Victor Asuquo
    The development of wireless technology has facilitated the wide deployment of mobile communication systems. The beauty of wireless communication is that all nooks and corners can be reached at a cheaper and faster rate when compared with wireline. Wireless is now dominating the telecommunications market. Initially, the dawn of wireless was seen as the dawn of communications to poor countries and rural areas which were poorly covered by wireline devices due to high cost. Currently, the story has changed. Both the wired and unwired environments are clamoring for wireless connectivity. Considering the hype of R&D in broadband technologies and easy acceptance in the market place, wireline communications may soon die a natural death. However, wireless communications faces a few challenges. One of them is that the radio frequency (RF) carrier signals used in these communication systems degrades as it travels through the air interface due to attenuation and interference. As a result, the range of coverage may not be as planned leading to very weak reception or even dead zones where no communication can be done. This problem has resulted in the development of cellular signal boosters that help in receiving the weak signal, amplifying and then re-transmitting it to reach the uncovered areas. Boosters are now giving hope to the frustrated wireless users such as indoor users and those at the fringes of a cell site. These boosters are diverse in make, range, method of operation, deployment and cost. In this paper, a survey of various signal booster designs, deployment and performance is presented. It is hoped that this will serve as a one-stop shop for researchers and developers in the important field of wireless signal boosters and extenders, who wish to know what is available and existing challenges