2007 International Bhurban Conference on Applied Sciences & Technology

8-11 Jan. 2007

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Displaying Results 1 - 25 of 38
  • [Front cover]

    Publication Year: 2007, Page(s): C1
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  • Proceedings of International Bhurban Conference on Applied Sciences & Technology

    Publication Year: 2007, Page(s): ii
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  • [Copyright notice]

    Publication Year: 2007, Page(s): iii
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  • Preface

    Publication Year: 2007, Page(s): iv
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  • Table of contents

    Publication Year: 2007, Page(s):v - viii
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  • [Breaker page]

    Publication Year: 2007, Page(s): nil1
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  • [Breaker page]

    Publication Year: 2007, Page(s): nil2
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  • High Power LDMOS Transistor for RF-Amplifiers

    Publication Year: 2007, Page(s):1 - 4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1414 KB) | HTML iconHTML

    We designed simulated and optimized laterally diffused Si-MOSFET (LDMOS) transistors in Sentaurus TCAD software. By introducing excess interface charge density at the RESURF (reduced surface field) region, a power density 1.5 W/mm with a PAE (power added efficiency) of 45% at 3 GHz were obtained. The gain was 20.3 dB. These results show the enhancement in RF performance by introducing excess inter... View full abstract»

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  • On the Effect of Mutual Interaction between the Walls for Modelling Radio Propagation in Indoor Environment

    Publication Year: 2007, Page(s):5 - 9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1563 KB) | HTML iconHTML

    Study of radio-wave propagation into and through buildings has become important with the increase in the broadband mobile services. Currently ray tracing and ray launching techniques are used for modeling radio transmission but due to unavailability of detailed building databases, it is not possible to take into account all the edges and discontinuities in the buildings. To overcome this limitatio... View full abstract»

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  • Design and Implementation of an X-Band Frequency Synthesizer for Radar Applications

    Publication Year: 2007, Page(s):10 - 14
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1192 KB) | HTML iconHTML

    This paper describes the design, development and testing of an X-band frequency synthesizer. The synthesizer consists of a voltage-controlled oscillator (VCO), a phase-locked loop (PLL) circuit and a reference oscillator. Commercially available components used in the design provide a low cost and short time to market solution. Typical output power of the synthesizer is +10 dBm. Loop filter is desi... View full abstract»

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  • S-Band MESFET Linear High Power Amplifier for OFDM Applications

    Publication Year: 2007, Page(s):15 - 18
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1271 KB) | HTML iconHTML

    One of the critical blocks in OFDM based transmitter is its power amplifier and the design is aimed for high linearity with maximum power efficiency. This paper describes the design and fabrication of S-band solid state high power amplifier using GaAs power MESFET device for OFDM transmitters. The amplifier operates at center frequency of 2.3 GHz with a bandwidth of 200 MHz. The typical output pow... View full abstract»

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  • Dual Band Tunable LNA for Flexible RF Front End

    Publication Year: 2007, Page(s):19 - 22
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2296 KB) | HTML iconHTML

    This paper presents a dual band LNA that can be switched between two bands (2.4 GHz & 5.2 GHz) for IEEE 802.1 la/b/g WLAN applications. The LNA is also tunable within each band and the tuning is incorporated by on-chip varactors. The test chip consists of two fully integrated narrow-band tunable LNAs along with SPDT switch. For power saving one LNA can be switched off. The technology process i... View full abstract»

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  • Design and Development of an Offset-Beam Slotted Waveguide Antenna

    Publication Year: 2007, Page(s):23 - 26
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2130 KB) | HTML iconHTML

    Planar slotted waveguide antennas usually have their main-beam pointed perpendicular to the antenna aperture. While this arrangement is most practical and convenient from design point of view, it suffers a serious setback in that it offers large RCS in the direction of antenna main-beam. This paper presents the design and testing of an offset-beam antenna for low RCS applications. A linear traveli... View full abstract»

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  • VLSI Implementation of an Efficient Pre-Trace Back Approach for Viterbi Algorithm

    Publication Year: 2007, Page(s):27 - 30
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1135 KB) | HTML iconHTML

    This article focuses on trace back unit of Viterbi algorithm for constraint length K = 7. Conventional trace back unit comprises of three types of memory operations: decision bits write, trace back read & decode read whereas the pre-trace back approach exploits the inherent parallelism between the decision bits write & decode traceback operation. This approach results in reduction in laten... View full abstract»

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  • Design of a Low Side Lobe Slotted Waveguide Planar Array

    Publication Year: 2007, Page(s):31 - 34
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (978 KB) | HTML iconHTML

    In this paper, characterization of waveguide slots in an FEM based EM analysis software has been discussed. Characterization has been done for longitudinal broad wall radiating slot and centered-inclined broad wall coupling slot. Using this characterization, a Ku band 8 times 8 planar array antenna has been designed with Elliot's design equations. Its performance was first checked in an FEM analys... View full abstract»

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  • Digital Implementation of Pulse Compression Technique for X-band Radar

    Publication Year: 2007, Page(s):35 - 39
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1570 KB) | HTML iconHTML

    The performance of conventional pulsed radars is limited by its "time-bandwidth" product. In order to get high range resolution, a narrow pulse is required to be transmitted. However, this reduces the average transmit power resulting into shorter detection range. To mitigate this limitation of "time-bandwidth" problem, pulse compression technique is used. Pulse compression technique can be broadly... View full abstract»

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  • Designing of High Efficiency Power Amplifier Based on Physical Model of SiC MESFET in TCAD

    Publication Year: 2007, Page(s):40 - 43
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1874 KB) | HTML iconHTML

    The pulse input Class C power amplifier response of an enhanced version of a previously fabricated and tested SiC MESFET 11 are studied using a new technique to its physical model in TCAD. The device is simulated at 5% duty cycle pulse for Gain (dB), Power density (W/mm), power loss and power added efficiency (PAE %) at 500 MHz and 1 GHz. The results are then correlated to the device features in D... View full abstract»

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  • Hand Off Issues in 3G UMTS Networks

    Publication Year: 2007, Page(s):44 - 48
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2559 KB) | HTML iconHTML

    Universal Mobile Telecommunication System (UMTS) is a third generation mobile communication technology based on wideband CDMA (WCDMA) and can facilitate the users in much better way as compared to the second generation of mobile communication. UMTS is superior to second generation in terms of bandwidth efficiency, quality of service, speech quality, speed and capacity. At present, more than 60 cou... View full abstract»

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  • Narrowband Beamforming Algorithm for Smart Antennas

    Publication Year: 2007, Page(s):49 - 54
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2972 KB) | HTML iconHTML

    The multidisciplinary field of smart antennas has become significantly important over the past two decades. In this paper constrained least mean square (CLMS) algorithm for narrowband adaptive beamforming has been derived. This algorithm is capable of efficiently adapting according to the environment and able to maintain the chosen frequency response in the look direction always while minimizing t... View full abstract»

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  • Design, Fabrication and Testing of a Millimeter Wave Slotted Waveguide Antenna

    Publication Year: 2007, Page(s):55 - 57
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1320 KB) | HTML iconHTML

    The ever-growing demand of higher data rates is pushing the modern wireless communication systems towards millimeter wave frequency band (30-300 GHz). At these frequencies the available bandwidth is much larger, resulting into increased data rates. Thus, there is a growing demand of efficient antennas operating at these high frequencies. This paper deals with the design of linear and planar resona... View full abstract»

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  • A Novel Nonlinear Controller Design for the Inertia Wheel Pendulum

    Publication Year: 2007, Page(s):58 - 62
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (940 KB) | HTML iconHTML

    This paper considers the stabilization problem of inertial-wheel pendulum, a widely studied nonlinear mechanical system. Inertial wheel pendulum is classical example of a flat underactuated mechanical system. The design of control laws for underactuated mechanical systems are challenging because of their underactuated nature, posing problems in exact feedback linearization. A novel nonlinear contr... View full abstract»

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  • Bond Graph Modeling and Simulation of Impact Dynamics of a Car Crash

    Publication Year: 2007, Page(s):63 - 67
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1622 KB) | HTML iconHTML

    The crashworthiness of an automobile and the survivability of its passengers in road accidents are of paramount importance to the automobile industry. Thus the designers in making automobiles have focused increased attention on designing a car, which provides greater protection for the drivers and the passengers in case of an accident. Before a new model is launched into the market, a complete col... View full abstract»

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  • Comparative Study of Speed Control Algorithms for UAV Applications

    Publication Year: 2007, Page(s):68 - 72
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2175 KB) | HTML iconHTML

    This paper presents performance comparison of three speed control schemes (engine throttle control) for LAV applications. First scheme uses fixed throttle levels (three levels for cruise climb and descend) however no speed feedback was used in the control loop. Second scheme also uses fixed throttle levels however number of levels are increased and switching is performed based on speed feedback us... View full abstract»

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  • Fuzzy Expert System for Defect Classification for Non-Destructive Evaluation of Petroleum Pipes

    Publication Year: 2007, Page(s):73 - 77
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2472 KB) | HTML iconHTML

    In this paper, an expert system has been outlined to classify the defects in metallic petroleum pipelines using acoustic techniques with non-destructive evaluation (NDE) protocols, the proposed system maps the quantitative defect data through a novel perception-based kernel that has its roots in multidimensional fuzzy set theory to map the relative weights given to various features; mathematical o... View full abstract»

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  • RTLinux based Simulator for Hardware-in-the Loop Simulations

    Publication Year: 2007, Page(s):78 - 81
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1852 KB) | HTML iconHTML

    Hardware in the loop (HIL) simulations are being increasingly employed for rapid control prototyping, calibration and validation of the electronic control units. The stringent timing requirements and high development time arc the main challenges in HIL simulation. The strict timing requirements demand a hard real-time operating system which is reliable, robust and deterministic in nature. In this ... View full abstract»

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