Master of Science in Electronics & Telecommunications

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Browsing Master of Science in Electronics & Telecommunications by Author "Samarasinghe, ATLK"

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    item: Thesis-Abstract
    Broadband connectivity using optical Access for the eastern province of Sri lanka
    (2015-08-27) Alakurajah, B; Samarasinghe, ATLK
    In Sri Lanka the widely used wired technology for broadband access is Asymmetric Digital Subscriber Line (ADSL).Fiber access is available in the Western Province with limited usage such as for business purposes. The Eastern Province is the focus for this research because it is one of the affected areas during the last two decades ofwar and therefore has limited facilities for the people living in that part of the country.The development work in the Eastern Province is in progress at present and it also includes facilities for broadband access. ADSL broadband usage within Eastern Province is available but limited to city areas only. This work focuses on a system to implement Fiber to the Home (FTTH) for the Eastern Province and thus provide efficient broadband access for its people. The available Fiber Access technologies are analyzed and the most suitable one is selected for implementation. The thesis proposes a network based on Passive Optical Network (PON) technology to be employed with Gigabit PON (GPON) in order to provide FTTH to a wider area of the Eastern Province. The GPON technology includes Coarse Wavelength Division Multiplexing (CWDM) with Time Division Multiple Access (TDMA); known as Hybrid PON. For the selected four cities Optical Line Terminal (OLT) locations are identified and Ring topology access is used with Remote Nodes which can be expandable when customer number increased. A cost estimate using the current equipment prices and the payback of the capital are calculated and presented in the thesis. The performance of the proposed network is analyzed which includes the Link Power Budget and the Bit Error Rate(BER). The performance analysis shows that the proposed Optical Access Network using GPON is feasible for implementation in the Eastern Province.
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    item: Thesis-Abstract
    Indoor signal propagation : a case study for Sri Lanka
    Chandraguptha, GLR; Samarasinghe, ATLK
    Mobile communication radio channel vanes very rapidly at times and causes very hard to predict its behavior and characteristics. Even if the channel does not explicitly change, speed of the mobile user and the surrounding will contribute to these variations causing many problems for mobile communication. Therefore study of Indoor signal propagation is an important factor in arriving at a good mobile network design. Most of the work carried out in this area is specific for a particular country, region or area as evident by previous researches. Research specific to an area is essential since deals with surrounding buildings, environment and especially in the case of indoor propagation building material used for construction. In this research the radio signal strengths inside a building were measured for two cases; one where the transmitter is an outdoor antenna installation and the other where the transmitter is an indoor antenna installation. Literature surveyed propagation models, equations and other graphs were used to map the measured and analyzed signal strength values, attenuation characteristics, propagation characteristics. Principal objectives of the research were to determine how these parameters fit into best model(s) and determine the parameters appropriately to suit the conditions in Sri Lankan context. The parameters obtained are of similar range with other literature surveyed values such as path loss exponent, floor attenuation factor and partition attenuation factor values. The parameters obtained can be used for any commercial software used in indoor signal strength estimations as the starting values for signal strength optimization and in order to obtain better results in terms of optimum signal coverage and optimum antenna placement. Generalization of these parameters for Sri Lankan context can be done once similar type of analysis is carried out in many buildings in Sri Lanka