Master of Engineering in Electronics and Telecommunications

Permanent URI for this collectionhttp://192.248.9.226/handle/123/231

Browse

Now showing 1 - 20 of 22

item: Thesis-Abstract
Linear Stirling Generator Feasibility Study for Distributed Power Generation
(2014-08-06) Gunawardana, KIM; Munindradasa, AMI; Munasinghe, R
The Stirling engine was originally patented 1816 by the Reverend Robert Stirling, and was eighteen years before Carnot's ideas were published. It is a reciprocating engine that has proved reversible both practically and, thermodynamically [l]. The ideal Stirling cycle has the Carnot efficiency [2]. The Stirling engine is a closed cycle external combustion engine that employs a gaseous working fluid inside the engine.
item: Thesis-Abstract
An Island-wide SDH transmission network for the Ceylon Electricity Board
(2014-07-07) Sharifdeen, MNSS; Samarasinghe, ATLK
Optical fibers are the choice of transmission medium for the high capacity telecommunication transmission systems of today such as Synchronous Digital Hierarchy (SDH), giving a very high yield for the investment made. With the already established highly reliable power transmission infrastructure, together with the advancement of technology, the utilities have a very high potential market in the telecommunication carrier service. By replacing the ground wires of the overhead high tension transmission lines with Optical Ground Wires (OPGW), utilities can build-up a country-wide high capacity transmission network over a relatively very short time frame and a very low investment. This paper analyses the possibility of establishing an island-wide optical fiber transmission network for the Ceylon Electricity Board based on the OPGW technique
item: Thesis-Abstract
Review of transmission network and grid capacity limitations for absorption of distributed energy generation
(2014-05-31) Perera, KKP; Perera, Prof. R; Banda, Dr. HMW
Grid connection of small generators to the distribution network to sell electricity to CEB has developed into a major business in Sri Lanka. Power purchase agreements, grid connection guidelines were also developed with the development of the industry. Limitations on the grid connection capability were also laid down. Two of the main limitations are as follows; a) Maximum capacity of generation that can be connected to a Grid Substation with 2*31.5 MVA transformers is limited to 25MW. b) Maximum capacity of total generators that may be connected to the system be limited to the lower of either, 6% of the peak power demand or 15% of the Off Peak power demand. It is stated that these limitations are to be revised with time to be in line with the latest system parameters and configurations. Since no study has yet been made to review these, an attempt is made to review the above limitations. This study is mainly forcussed on the first limitation. On analyzing the grid substation capacity limitation, it is noted that a detail study of the pattern of generation and the details of the individual feeder loads need to be made. Since there is a minimum (guaranteed load) at each GSS, this load can be considered in arriving at the maximum amount of DGs that can be connected at each GSS. Accordingly it is noted that the maximum capacity of DGs that can be connected at Balangoda and Ratnapura grid substations with (n-1) reliability criteria amount to 40 and 38 MVA respectively. These values are calculated with load values at each of the grid substations relating to year 2010. As the demand for electricity has been increasing at around 9% annually in Sabaragamuwa province these values will also subject to revision annually. It is noted that transmission system is having its limitations mainly on the Lynx single circuit line from Polpitiya to Seethawaka. Present situation need to be analyzed further before any more DGs are to be connected to the system.
item: Thesis-Abstract
Stirling cooler and controller
Gunaseela, JU; Munindradasa, AI; Munasinghe, SR
With the exposure of harmful effects of chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) on the ozone layer and also more recently even the latest alternative hydrofluorocarbon (HFC) refrigerants have also been found to be formidable global warming agents and are now under scrutiny for potential banning, The immediate need for alternative refrigeration cycles erupted. Free Piston Stirling Cooler (FPSC) is one of the solutions to this problem. A FPSC was developed along with the electrical driver system and the driver control circuit. The aim of this work is to develop an environment friendly, high efficiency, low weight cooling system suitable for the present day industrial/commercial requirements i.e. cool boxes, and also to develop it further to be utilized in advanced military applications. The working air volume and associated measurements were decided taking into consideration an operational cooler available in a thermal detection system. Further it was also intended to analyze the behaviour of cooler in different working gasses and under different pressures. Since the main objective of the project is the development of the cooler, a commercially available solenoid was used to drive the power piston and a timer was utilized to control the driver system.
item: Thesis-Abstract
Use of ground penetrating radar for landmine classification based on artificial neural network
Fernando, PSL; Munindradasa, DAI
This research is mainly aimed at developing a technique based on neural networks to classifymetal and plastic objects buried within a range of soil conditions. In addition, the validity of this technique is also presented. The explosives in land mines are generally cased in metal or plastic containers. Identification of buried metal and plastic objects using a neural network and a sensing teclmique based on an electromagnetic method are discussed in this thesis. Neural network simulation results for plastics and metal objects in the range of soil condition are also reported. Finding the appropriate frequency window (FvV) for the Ground Penetrating Radar(CPR) operation and the development of a theoretical mathematical model is also presmted. Using this model, the appropriate FW for CPR operation is derived. Furthermore the estimation of important system parameters of CPR, modulation and detection techniques, modelling of CPR, and clutter reduction techniques are also discussed in the context of this thesis.
item: Thesis-Abstract
Content-based image retrieval using large centre regions
Senaratne, RS; Pasqual, AA
Among all the visual features used for content-based image retrieval, colour is perhaps the most dominant and distinguishing one in many applications. Therefore in this research project, the concentration was focused on the colour property of images. In this work, a new histogram refinement technique, Large Centre Regions (LCR) Refinement, and a new region representation technique, LCR Sets, based on colour regions are presented. These methods extract a selected number of largest regions around the centre of the image and match other images emphasizing this property. Two assumptions are made. First is, that it can be assumed that the significant objects oritems of an image are often located at the centre. These objects can often be characterized by their colour. Hence an image retrieval technique which extracts the colours of large centre regions of an image would improve the retrieval performance for images with significant objects at the centre. The second is, that the techniques were tested on an image data base predominantly consisting of red images, but they perform similarly for other colours as well. The presented histogram refinement descriptor, Large-Centre-Regions Vector, effectively represents large centre regions of an image. In addition to this, LCR Sets represent basic information about the shape of a region. In the prototype, firstly, all the regions in an image were extracted depending on the similarity of the colour of the pixels. A centre zone was defined on the image and a selected number of largest regions which overlap with this centre zone at least by 50% of the region area were selected as the Large-Centre-Regions for histogram refinement basis. In addition to large centre regions, LCR Sets represent the areas of a selected umber of largest regions lying outside the centre zone and the width to height ratio of the minimum bounding rectangle of each region. Since the largest regions at the centre are given the emphasis for matching, effect of the background can be minimized as well because most part of the background often lies outside the centre zone. Extra distinguishing capability among different images can be achieved with LCR Sets.Experimental results of LCR Refinement show much improved retrieval performance, especially for images with significant regions at the centre. Results show 20% average improvement in ranks with LCR Refinement compared to Histogram. By combining LCR Sets with either Histogram or LCR Refinement, this can be further improved upto 26% or 22%, respectively.
item: Thesis-Abstract
Aircraft locating system
Pathirage, RJ
This research project is to design and develop a Centre for the Aircraft data locating system utilizing Air Craft Instruments and GPS with existing voice network belongs to Sri Lanka Air Force. Currently, Air Traffic Controllers of the Sri Lanka Air Force do not have an automated system (our own system) to monitor the air craft movements within their field of range. Hence, implementation of our (SLAF) owns system was a long felt need .Availability of separate IFF radar systems will be a solution; however it will be an expensive option for the government of Sri Lanka at this juncture. The main reason is that it is not only the Radar, but the entire fleet of the Sri Lanka Air Force Air Craft that are required to be equipped with IFF transponders. Hence this project is to develop a dynamic solution which is effective, efficient and affordable in the present context. The outcome of the research would provide an aircraft location on a corresponding ground map in a viewing terminal available in front of the Air Traffic Controller. This timely information to the air traffic controller will be useful to establish a proper accurate air traffic controlling. Also, this will be a good source for the Sri Lanka Air Force to track whether the air craft movements are in accordance with the flight plans. This project consists of three main subsystems such as Onboard processing sub system. Onboard sensor subsystem and Ground Monitoring Station. In here Sensor information of the air craft have been gathered by using On board sensor subsystems and gathered information have been processed and taken decisions by using onboard processing subsystem. Finally all the gathered information have been transferred to the Ground Monitoring Station by using existing secure voice communication network available at Sri Lanka Air Force. It provides a very user friendly display provisioning Air Craft speed. Height and Location.
item: Thesis-Abstract
Mobile user behaviour determination in WCDMA using hidden markov models
Dampage, U; Dias, D
The vision of this research paper is that the mobile phone is aware of its LIS T'S motion stale and surroundings and modifies its behaviour especially the characteristics of Location-Based-Services based on this information. In the research it is evaluated and implemented ,a methodology which can identify individual user slates. This learning is expected to occuron line and docs not require any external supervision. The proposed system relies on Hid-den Markov Modelling and Log Likelihood Method. The underlying assumption of the statistical model is that the signal can be well characterized as a parametric random proc- ess. and that the parameters of the stochastic process can be determined (estimated) in aprecise, well defined manner. The basic philosophy of Hidden Markov model is that an ob-servation sequence can be well modelled if parameters of a Hidden Markov Model are carefully and correctly chosen. The problem with this philosophy is that it is sometimes inaccurate, either because the signal does not obey the constraints of the Hidden Markov Model, or because it is too difficult to get reliable estimates of all Hidden Markov Model parameters The implementation of the methodology is performed by first iraminL, tlu Hid-den Markov Model for the required number of speed states by the intended network trace.T he log likelihood value of the data for each hidden markov model in the set is computed and identifies the motion state-speed, by choosing the Hidden Markov Model that pro-duced the highest value. The method of maximum likelihood provided estimators that have both a reasonable intuitive basis and many desirable statistical properties, i lie main reason for the selection of maximum likelihood method is that it is very broadh applicable and simple to apply. The results of simulations indicate that the proposed method is able to as-sist to create a meaningful user context model at various propagation conditions defined by both 3rd Generation Partnership Project (3GPP) and Wireless World indicate New Radio(WINNER) propagation scenarios while only requiring a network trace-i.c. a received bitlength, without having an integrated sensor onboard cellular phone or an other wearablesens or device.
item: Thesis-Abstract
Capacity improvement of CDMA systems by adaptive beam forming using GRNN techniques
Jayawardena, C.S.
The objective of this work is to demonstrate a method of improving the capacity of a Code Division Multiple Access (CDMA) system by employing Neural Network based Adaptive Beam forming. A Generalized Regression Neural Network was used for this purpose. First, the Neural Network was designed, which could accurately predict the phase angle of the feed current to a ten-element antenna array in order to form a directional beam towards a given signal source direction while forming a null towards a given interfering source. Then, the model was developed to form multiple beams to wards different signal sources. Next, using the multiple beam forming technique, a new Space Division Multiple Access (SDMA) model was developed to improve the capacity of an existing CDMA system that has already become saturated. This SDMA model is based on the statistical distribution of the mobile users within a sector. It assumes that the user distribution within a sector is non-uniform. More densely populated areas within a sector are identified and the users in a particular area are grouped together. One such group is called a cluster. Similarly, a number of clusters are selected and the three most populated clusters are served with three isolated directional beams operating on the same frequency achieving SDMA. It was observed that this new SDMA model could improve the capacity of existing CDMA systems up to a maximum of 20% with three directional beams.
item: Thesis-Abstract
Laboratory generation of rayleigh fading
Rathnayake, LN; Dias, D
Mobile radio channel simulators are essential for repeatable system tests in a development, design, or test laboratory. Due to the random, uncontrollable nature of the mobile propagation path, it is difficult to generate repeatable Held test results. Also doing Held tests in a mobile environment is considerably more expensive. An approach for hardware simulation of Rayleigh lading is presented in this thesis. The heart of the simulator is a Digital Signal Processor (DSP), which implements the random noise and the digital filtering necessary for the generation of a Rayleigh faded signal. The results indicate that the proposed hardware simulator can simulate Rayleigh fading with a high degree of accuracy. The envelope of the generated Rayleigh fading had been observed by an Oscilloscope. I lie observations have been done also for carrier frequency of 900MHz..
item: Thesis-Abstract
Implementation of a full-featured IP telephony system
Ariyarathna, SMWPK; Dias, D; Dias, G
Traditionally, voice traffic has been carried on circuit-switched networks. However, in recent years great interest has been generated in carrying voice over a variety of non traditional packet-switched networks. These techniques are known generally as Voice over Packet (VoP).The most popular implementation of VoP has been VoIP on the P- based Internet. Other VoP technologies comprise those such as voice over Frame Relay (VoFR),Voice Over ATM (VoATM)and voice over Digital Subscriber Loop (VoDSL).IP is the dominating technology in end user level deployments, carrying millions of minutes of voice traffic today. This thesis describes the implementation of an Internet Telephony (Voice over IP, VoIP) system within the University's voice and data networks. The deployment of VoIP can reduce costs by combining all types of traffic onto a single network infrastructure, eliminating the need to maintain and pay for several different services. The University has its internal telephone network implemented via several PABXs, and its computer network consisting of several departmental networks. Implementation of the VoIP system enables the integration of the two, and through that, the extension of telephone facilities to a larger group of people, as well as the development of value-added services. ITU-T Recommendation H323 is the most widely used standard facilitating VoIP. Further this details the hardware and the software aspects of the designed H.323- based VoIP system, and their integration for implementation in the university-wide network.
item: Thesis-Abstract
Study and implementation of modern noise cancellation techniques
Anandarajah, T; Dias, D
"Study and Implementation of Modem Adaptive Noise Cancellation Technique" consists of two major parts: "analysis and simulation" of noise cancellation algorithms and implementation of one of the algorithm using DSP hardware. The analysis and simulation work is divided into two major categories: LMS algorithms and RLS algorithms. In this project, three variants of the LMS algorithm and standard RLS algorithm are analyzed. The simulation results and the program listing are listed in the appendices. An evaluation kit with the ADSP 2181 processor is used to implement the algorithm. The assembly language code for implementation is listed in the Appendices.// Adaptive Noise Cancellation is used to remove background noise from useful signals. This is an extremely useful technique where a signal is submerged in a very noisy environment. The usual method of estimating a signal corrupted by additive noise is to pass the distorted signal through a filter that tends to suppress the noise while leaving the signal relatively unchanged. Adaptive noise cancellation is performec when there is no prior knowledge of the signal and the noise sources or when the noise is within the signal bandwidth.
item:
Estimation of propagation characteristics in the FM environment
Ratnapala, ENPK
Electromagnetic Compatibility (EMC) analysis involved in the planning process of a FM broadcasting service is an intricate and complex procedure, which is dependant fully on the propagation prediction models. For these predictions theoretical and empirical models are used. But the applicability, approach, complexity and the accuracy of each of these models can differ by a wide margin, producing lack of confidence and higher degree of uncertainty. Therefore choosing a model for a specific EMC Analysis with the required accuracy is of primary concern.// Most of these models have been developed in many parts of the world. Stringent validation of these models as distinct to the Sri Lankan environment is an essential requirement by testing on locally collected data. But apparently due to the extent of measurement and analysis facilities required this had been a minority activity.// In this research work the applicability of generally acceptable empirical and theoretical propagation models such as free space(L,..). plane earth (L,,) modified plane earth (/,,,), Max (L,.,LP) Max (LF,Lr), ITU PN 370-6, FCC are compared for their performance for typical rough and irregular terrain commonly found in Sri Lanka by observing the received signals of FM sound broadcast transmissions originating from Nuwara Eliya and Colombo.// The results show that theoretical model Max (LF,LP). is the most accurate model for FM broadcast environment in Sri Lanka. It is seen that this model, yields most accurate results even in irregular terrain with Epstein Peterson diffraction correction
item: Thesis-Abstract
Estimation of propagation characteristics in mobile environment
Vishakha, KSM; Dias, D; Dayawansa, IJ
Propagation in land mobile services including cellular is affected in varying degrees by topography, vegetation, man made structures, ground constants, the troposphere and the ionosphere. Also propagation of energy is strongly influenced by several factors including the natural and artificial relief, propagation frequency, antenna heights and others. The mobile radio signal varies in time and with spatial displacement. Even in the static case where the transmitter and receiver are fixed, the channel can be dynamic, since scatterers and reflectors are likely to be in motion. Thus multi path arises from the fact that through reflection, diffraction and scattering radio waves can travel from a transmitter to a receiver by many paths. Hence a precise estimation of signal characteristics in this environment constitutes a hard task. The thesis describes exercises in the estimation of the characteristics of cellular mobile signals operating in 900 MHz band through the real measurements obtained in different environments in Sri Lanka and the results of these exercises. Even though similar researches have been conducted in places like Europe, North America and Japan to derive empirical formulae such as Okomura- Hata Model, ITU-Rp.529, COST231, no study has been done as yet to check the suitability of these models to the Sri Lankan environment
item: Thesis-Abstract
DSP based speech training of hearing impaired children
Weerasinghe, DG; Dias,D
A study based on several digital signal processing (DSP) techniques to be used in the development of a computer-based speech trainer for hearing impaired children is presented. Children with congenital hearing impairments have difficulties in speaking, and even in making the basic sounds associated with speech. Speech therapists use specialized training methods to train such children. The dearth of qualified speech therapists and other facilities hinder the speech development of many children in need of such training in most of the third world countries. The speech trainer described in this dissertation was developed as an alleviation to the above problem. The training tool developed, will aid a child with initial guidance from an adult, to master the pronunciation of initial sounds taught in a speech therapy programme, in a game-like environment, with only a PC having multimedia facilities. Three DSP techniques were studied for application to the trainer. The objective was to identify whether an utterance by a trainee was acceptable or not compared to an utterance by a normal person. The three techniques were based on spectral analysis, for mam analysis and neural networks. The results with the spectral technique were found to be superior and were selected for use in the development of the training tool.// In its current status, the training tool can guide children in pronouncing the five vowel sounds, the first step in a speech therapy course
item:
Enabling wireless banking
Kuladinithi, WKK
This dissertation presents the work carried out to design and develop a mobileinternet- based banking application for a commercial bank.// In today's fast-paced world, people require connectivity while mobile or when remotely located. Today, individuals expect their mobile devices to be more than just a means of verbal communication. Checking bank accounts, settling bills, making money transfers are some of the activities that individuals would require to perform through their mobile devices. These requirements have brought about many different technologies and solutions to individual needs.// One such technology is the Wireless Application Protocol (WAP), which makes the Internet available on mobile devices. Having the capability to provide the Internet services on a mobile device has brought about many possibilities for businesses.// The Commercial Bank of Ceylon is a pioneer bank in Sri Lanka which has decided to identify the feasibility of providing their services on a WAP based environment. This research project was carried out after identifying their requirements.// The Preliminary Study phase of this project identified and evaluated the technologies on which the application would be developed and deployed. Emulation tools, WML, WML Scripts, Java Servlets, JDBC, ODBC, the Commercial Bank's requirements and the WAP architecture were the main areas of study and evaluation during this phase.// The application was designed based on the requirements of the bank. It consisted the identification of the relevant entities, processes and data dictionary items. Based on this design, the application was developed using a set of Java servlets. These servlets generated the WML code to display information and accept user interaction on the mobile device. A system test was undertaken once the application was developed on a simulated environment. This simulated environment comprised of the software based mobile device, the web server and the WAP gateway. The back end of the application contained a Microsoft Access based environment replicating the same data structures as found on the bank's DB/2 database.// Finally, two deployment options of the developed solution were identified. The first option was to base the WAP gateway with the mobile operator. The second wds where the bank could use an in house WAP gateway. These two deployment options were evaluated in terms of commercial as well as technical feasibility. The first option was tested successfully on a real environment made available by the mobile operator, Dialog GSM in Sri Lanka.// This research project shows that WAP based wireless banking is viable and also it makes a case for any bank or financial institution to adopt this technology in the future.
item: Thesis-Abstract
Adaptive fuzzy systems
De Silva, GLPJ; Jayasingha, JAKS; Samarasiri, BS
Fuzzy sets offer a possibility to formally describe linguistic expressions. An adaptive fuzzy logic system not only adjusts to time or process phased conditions but also changes the supporting system controls. A real time target tracking system has been selected as a situation where an adaptive fuzzy controller can be implemented. The inputs to the system will be the Error, The rate of change of error and the previous velocity of the platform with respect to the target for elevation as well as for the azimuth. The output will be the velocity required for the platform to track the target. Target tracking systems have been designed in various methods, and in the project I have selected to use an adaptive fuzzy system to simulate the target tracking system. Objectives (a) to design a Matlab interface to study the behaviour of a fuzzy system. The inputs, outputs, term sets and the rules to be specified in the system and to be used subsequently to study the system behaviour. (b) to simulate a target tracking system and to design its controller. (c) to test an adaptive technique on the system and to compare the adaptive system with the normal fuzzy system to decide on the optimum controller. The interface was designed using Matlab version 4.00, and the inputs are the number of inputs and outputs, names of inputs and outputs, term sets and the rules. Separate Matlab in files were written to implement the controller. Adaptive techniques can be used in the system with modifications to the controller implementation. The number of rules to be used can also be increased by modifying some of the functions. It can be shown that when an adaptive technique is used the target can be tracked with a minimum error.
item: Thesis-Abstract
Tropospheric range error corrections for the global positioning system in Sri Lanka
Seneviratne, A; Dayawansa, IJ; Dias, D
The Global Positioning System is the most accurate positioning and navigation system in use today. It uses the time of arrival of radio signals transmitted from satellites placed in high altitude orbits around the globe. The ideal GPS theory assumes free space radio propagation whereas in reality, the signals have to propagate through the atmosphere. When propagating through the atmosphere the finite refractive index of the various layers of the atmosphere causes the electromagnetic waves to travel distances that are longer than the corresponding free space distances. This causes an error in the observed time of arrival which is carried on to the positional computation. The error due to refraction in the troposphere is of particular interest. Unlike the ionosphere, the troposphere is non-dispersive. Its refractive properties depend more on physical parameters such as pressure and temperature. Due to this reason, the refractivity tends to depend on the location as well. It has been shown that a good correlation exists between the refractivity at the surface of the earth and the range error. Hence this error may be determined using the refractivity at the surface of the earth. In this dissertation, the effect of the troposphere on GPS observations made within the geographical extent of Sri Lanka is studied. The range errors at reference locations within Sri Lanka are determined for different parts of the year. The results are compared with established results for the region and reasons for discrepancies are briefly discussed. The design of a conceptual GPS receiver processor that can self-correct tropospheric range errors at the surface of the earth by sensing the pressure and the temperature is proposed. A computer program is used to simulate the operation of this receiver.
item: Thesis-Abstract
PC-based image reconstruction for MR imaging
Hettiwatte, SN; Jayasinghe, JAKSJ; Samarasiri, BS
Reconstruction is the abstract rebuilding of something that has been torn apart. In the medical imaging context, it is often necessary to acquire data from methods that essentially tear data apart in order to be able to view what is inside. Also, a big part of reconstruction is then being able to view, or visualise, all the data once it is been put back together again. In MRI, the imaging device acquires data of a cross-sectional plane of the tissue being studied. The process of reconstruction then involves rebuilding of the cross-sectional view of that plane from the acquired data. Usually, the imaging device acquires data from a number of cross-sectional planes of the tissue being examined. Then, in reconstruction, all these planes are stacked back together to obtain a complete picture of the tissue. Image reconstruction in MRI is usually performed by dedicated hardware. A typical system usually consists of multiprocessors, application specific integrated circuits (ASIC) and uses parallel processing techniques. These systems are capable of high speed image reconstruction, both 2D and 3D, high resolution image display and manipulation. Obviously, these systems are fairly expensive. In this project a general purpose PC operating on Microsoft® Windows" 98 operating system was used to reconstruct a 2D image of a slice through the human head, using head scan data available from a MRI scanner. The FID signals from the scanner were available as projection data, which have been collected by suitably rotating the magnetic gradients. The filtered back-projection algorithm with nearest neighbour interpolation scheme was used in the reconstruction program, which was written in Matlab ®. The resulting image from this system is acceptable. With the ever-increasing processor power of PC's and cost of PC's coming down, PC-based image reconstruction would find its way in a cost effective MRI system
item: Thesis-Abstract
Smart base station antenna
Punchihewa, SAS; Dayawansa, IJ
Telecommunications incur a strong impact on the society. Out of its many sectors, mobile communications experienced an unprecedented growth around the globe in recent times .Service providers will have to satisfy this increased customer need using a spectrum, which does not grow proportionately. Several multiple access systems such as frequency division multiple access, time division multiple access and code division multiple access are used at present to increase the efficiency of spectrum utilization. The smart antenna, consisting of an array of elements, monitors its signal environment and forms a beam towards the wanted signal. Thus, on top of the existing access methods it provides an additional multiple access method namely space division multiple access in which several users access portions of space simultaneously. There exist different methods or algorithms for formation of the beam towards the desired signal. Some of them form a beam and rotate while monitoring the satisfaction of certain conditions, which indicate the correct formation of the beam. Some others find the directions of arrival of signals (DOA) and then form the beam towards the desired direction of which the resolution is higher. In spite of high-resolution capability, these algorithms demand knowledge of the propagation characteristics of the mobile channel. This necessitates modeling of the channel after theoretical or empirical considerations. This dissertation presents the work carried out to determine the DOA of a desired signal which is to be used in an adaptive antenna in a variety of propagation channels. The suitability of MUSIC (Multiple Signal Classification) algorithm was investigated. It was necessary to find the ability of the algorithm to estimate the DOA of impinging signals. However, the channel modeling was also a necessity. To determine the accuracy of the estimation, the error between the actual and estimated DOA was determined and analyzed. MATLAB was used for simulations because of its capabilities to handle large amount of matrix related computational activities efficiently. An artificial channel with free space conditions was initially used to test the method of estimating the DOA, and to check the suitability of error analysis as a method of determining the accuracy. In this artificial channel, estimation of several DOA was performed for different conditions of environment monitoring and different antenna array geometry. Different number of signals was used with different angles of arrival. Hence, the dependence of errors on the above different conditions was determined and there by the suitability of the error analysis to determine the accuracy was examined. by European Union were used and the performance of the MUSIC algorithm in different channel conditions was analyzed. Using the measured signal value data in the Colombo Fort area, the channel was mathematically modeled and MUSIC algorithm was tested for Colombo Fort. MUSIC algorithm was found to be suitable for use in adaptive cellular base station antenna.