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Electronics, Communications and Photonics Conference (SIECPC), 2011 Saudi International

Date 24-26 April 2011

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Displaying Results 1 - 25 of 138
  • [Front cover]

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    Freely Available from IEEE
  • [Copyright notice]

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    Freely Available from IEEE
  • An emerging concept for 4G+ wireless cellular networks: Terminal relaying

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (58 KB) |  | HTML iconHTML  

    We identify relaying as one of the most effective and enabling components of the LTE-A standard. However, this standard suffers from a major weakness that results from the assumptions that the relaying nodes are static, their locations are known and their number is fixed. While these assumptions facilitate the design of the cellular system, they limit the scope of relay usability. As an alternative, we consider a cellular system in which the wireless terminals (WTs), in addition to transmitting their own signals, act as relays to assist other WTs. In such a system the number of relays scales with the number of WTs offering the system designer significantly more degrees of freedom. However, using WTs as relays presents a number of challenges, including: the mobility of the relaying WTs, the incidental manner in which the relays access the network, the resource blocks (RBs) to which each relay is entitled, the relaying mechanism used by each relay, and the way in which the power is allocated across frequency bands. View full abstract»

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  • Wireless Sensor Networks for smart grid applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB) |  | HTML iconHTML  

    Electrical power grid is among the critical infrastructures of a nation. In the past several years, the power grids have experienced several major failures which have caused large financial losses in various countries around the globe. In a close future, the imbalance between the growing demand and the diminishing fossil fuels, aging equipments, and lack of communications are anticipated to negatively impact the operation of the power grids. For this reason, governments and utilities have recently started working on renovating the power grid to meet the power quality and power availability demands of the 21st century. The opportunities that have become available with the advances in Information and Communications Technology (ICT) have paved the way to this modernization. The new grid empowered by ICT is called as the smart grid. The natural extension of the smart grid applications to the consumer premises can be through Wireless Sensor Networks (WSNs) which are able to provide pervasive communications and control capabilities at low cost. WSNs have broad range of applications in the smart grid. In this paper we discuss the application of the WSNs in the home energy management services. We evaluate the performance of WSNs in terms of delivery ratio, delay and Packet Delay Variance (PDV) for varying interarrival times and varying network sizes. We also provide numerical results on the reduced cost, load and carbon emissions by our home energy management application. View full abstract»

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  • Optimization of interconnect architectures through coding: A review

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (101 KB) |  | HTML iconHTML  

    Interconnects are becoming a major bottleneck in the design of modern Systems-on-Chip. Power consumption, propagation delay, statistical variability, and reliability are some of the key challenges that must be addressed to fully optimize the interconnect architecture. This work provides a thorough review and analysis of the advantages and possibilities of coding for addressing the aforementioned challenges during the optimization of the communication architecture of a System-on-Chip. An outlook into future research directions is also presented. View full abstract»

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  • An introduction to reversible circuit design

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    After decades of continuous improvements and shrinking feature sizes, the development of conventional computing technologies faces enormous challenges. In particular, power dissipation in today's computer chips becomes crucial. Reversible computation is a promising alternative to these technologies, where power dissipation can be reduced or even eliminated. Furthermore, reversible logic builds the basis for quantum computation - a completely new way of processing which enables to solve certain problems exponentially faster compared to conventional methods. However, the design of reversible and quantum circuits is significantly different. Thus, new methods e.g. for synthesis, optimization, or verification are needed. This paper provides a brief introduction into reversible circuits and their respective design methods that have been proposed within the last years. View full abstract»

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  • Design of Wide Band PVGA for UWB applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (118 KB) |  | HTML iconHTML  

    A large dynamic range Programmable Variable Gain Amplifier (PVGA) suitable for Ultra Wide Band (UWB) applications is presented. The PVGA is composed of three variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows our proposed PVGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. The PVGA circuit is designed and simulated in a 0.13 um IBM-CMOS technology; it consumes 21 mA from a 1.5 V supply. The PVGA achieves 46 dB maximum gain with 48 dB gain dynamic range, a -43 dB THD at peak-to-peak differential output voltage of 800 mV and frequency 400 MHz. Moreover; the proposed circuit reports a good noise performance; the average integrated noise is 141 nV/vHz at minimum gain of -2 dB. View full abstract»

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  • A design methodology for system level synthesis of multi-core system architectures

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (799 KB) |  | HTML iconHTML  

    A multi-core system is an integrated circuit containing multiple processor cores that implements most of the functionality of a complex electronic system and some other components like FPGA/ASIC on a single chip. In this paper, we present a novel approach to synthesize multi-core system architectures from Task Precedence Graphs (TPG) models. The front end engine applies efficient algorithm for scheduling and communication contention resolving to obtain the optimal multi-core system architecture in terms of number of processor cores, number of busses, task-to-processor/channel-to-bus mapping, optimal schedule, and HW/SW partition. The back end engine generates a SystemC simulation model using a well-known commercial tool model generation library. The viability and potential of the approach is demonstrated by a case study. View full abstract»

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  • Long reach PON management and protection system based on optical coding

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    We propose a fault management and protection system for the ring-and-spur long reach PON. We exploit an adapted, enhanced performance, and inexpensive passive optical components in the field and electronic switches in the central office (CO). Our system allows detecting and localizing not only faulty segments but also faulty nodes, hence alleviating the false alarm probability encountered in previous systems. We show that using ring duplication protection in LR-PON can save half the cost compared to full duplication protection with relatively high reliability (99.9925). We derive an expression for the upper bound notification and recovery times. Moreover, we found that our system can recover from a fault in about 0.5ms as an upper bound. View full abstract»

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  • Improvement of the performances MPPT system of wind generation

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (378 KB) |  | HTML iconHTML  

    The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated. There are two families from control structures, the strategy from maximizing the power with and without velocity control. The aim of this paper is to evaluate the performances of two types of MPPT controllers mentioned on an 7.5 kW test bench containing a DFIG and we interested to compare this two strategies from maximizing the power extracted for a wind generation system with a horizontal axis The corresponding simulation model are described in section III. The studied MPPT controllers are presented results are given, analyzed and discussed in part in part IV. Finally, In last part, extracts some conclusions on this paper. View full abstract»

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  • Adaptive UWB-OFDM Synthetic Aperture Radar

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (518 KB) |  | HTML iconHTML  

    This paper presents an empirical study of high resolution potentially jamming-resistant Synthetic Aperture Radar (SAR) system based on UWB-OFDM architecture. The Range-Doppler Algorithm (RDA) was used to construct a high resolution SAR image for simulation purpose. Suitable waveforms to achieve high resolution SAR imaging are proposed for both friendly and hostile environments. The proposed waveforms were tested for a point scatterer and for full 2-D SAR image construction. Simulation results demonstrate the benefits of using UWB-OFDM waveforms for SAR system, such as dynamic spectrum allocation, antijamming potential through pulse diversity-while having a potential to produce high resolution target images. The use of UWB-OFDM waveform for SAR system proves useful for high resolution image data collection for civilian purposes and provides significant anti-jamming capabilities for military purposes. View full abstract»

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  • Metamaterial for gain enhancement of printed antennas: Theory, measurements and optimization

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (634 KB) |  | HTML iconHTML  

    Metamaterials have been shown to enhance specific performance parameters of low profile and high-profile antennas. Our focus in this paper on specifically increasing the gain of low-profile antennas and in particular the microstrip patch antenna. By placing a metamaterial slab above a microstrip patch antenna (as a superstrate), we show that the gain of the antenna can be enhanced appreciably. The key advantage of using the superstrate is to maintain the low-profile advantage of microstrip patch antennas. In previous works, different types of superstrates were proposed to enhance the gain of microstrip antennas, however, to the best of our knowledge, no theory was developed to understand the mechanism behind the enhancement in the gain. In this paper, we present a simple analytical formulation that provides a very accurate prediction of the gain when a superstrate is used. In fact, our analytical technique is capable of predicting the gain when a multilayer superstrate structures is used. To validate the theory of gain enhancement, antennas and superstrates using metamaterials were fabricated and tested in an echoic chamber. The metamaterials developed were based on split-ring resonators. Strong agreement was found between the measurements and full-wave simulation using commercial tools. Finally, we present optimization results to demonstrate the maximum gain enhancement potential that can be achieved when superstrates are used. View full abstract»

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  • Modelisation and simulation of the transmission properties in Dimer Fibonacci Superlattices

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    In this study, we have numerically examined the effect of applied bias on the transmission across Dimer Fibonacci Height Barrier Superlattices (DFHBSL) by using the exact airy function formalism and the transfer matrix technique. We have observed the formation of miniband structure and disappearance of the singularly localised states in the Structure of Dimer Fibonacci in height barrier superlattices (DFHBSL), Its due to the interaction between the states of the dimer wells inside the potential, the electron sees the system like two structure ordered imbricate one in the other, therefore, one tends more towards the order than the disorder related to the structure of Fibonacci. View full abstract»

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  • Nahrainfish: A green cryptographic block cipher

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (107 KB) |  | HTML iconHTML  

    In this work, we propose a new block cipher that is called Nahrainfish, which we believe that it offers the required security level for present and foreseeable future without a big sacrifice in efficiency and other related criteria. Instead of building Nahrainfish totally from scratch, we have made a benefit from the concepts of green cryptography and some AES (Advanced Encryption Standard) finalists to develop the new cipher in such a way to obtain the required higher security level. Nahrainfish is a classical Feistel network based on a novel combination of both key-dependent S-boxes and data-dependent rotations. It operates on 128-bit blocks and accepts a variable key length up to 1024 bits. The paper also includes some important notes on the security and performance of the cipher. View full abstract»

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  • Model-based hardware/software synthesis for wireless sensor network applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    In recent years the spectrum of wireless sensor network applications has grown dramatically. Sensor nodes range from very cheap nodes for control dominated applications like temperature, pressure, area and health monitoring to more powerful and sophisticated nodes used for audio and video surveillance. Implementing a low power hardware/software platform for computationally intensive applications such as video surveillance becomes challenging. Fast analysis of hardware/software trade-offs and accurate estimation of different cost functions becomes essential to improve the final quality of results and time to market. In this paper we start from a realistic application domain, namely sound-triggered wireless security cameras, and we show how one can start from an algorithm modeled and validated using Simulink and using commercial state-of-the-art tools explore various possible implementations for a key component, an FFT module. We show how rapid estimations of the various aspects of the cost function can be obtained quickly, using directly the C code generated from Simulink. Implementation results that we obtained are close to previously reported hand optimized results, showing the feasibility of our approach for trade-off analysis. View full abstract»

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  • Crisp commitment scheme based on noisy channels

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    In a crisp commitment schemes, a commitment must be opened using a unique opening key. However in such schemes, there could be many instances where the transmission medium or channel is corrupted by some kind of communication (transmission) noise. In this paper, we proposed a new scheme that enables the injection of fuzziness property to current ordinary crisp commitment scheme. In this way, the uncertainty occurring due to the noise presence is mitigated. It is a known fact that this kind of uncertainty naturally leads to the introduction of a fuzziness dimension to the commitment problem at hand. The security characteristic of our scheme relies on any cryptographic assumption unlike the fuzzy commitment scheme in the literature, which is based on hash function and should be strongly collision-free for the scheme to be secure. View full abstract»

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  • A note on the mathematical modeling of power amplifier/loudspeaker nonlinearity in acoustic echo cancellers

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    In this paper a new simple, three-parameter nonlinear mathematical model is proposed to represent the nonlinear characteristics of the power amplifier/loudspeaker nonlinearity in acoustic echo cancellers. The three parameters of the model are directly related to three distinct different sections of the nonlinear characteristic. The model and its first derivatives are continuous and stretch over the full range of input amplitudes. Using this model in conjunction with a conventional linear adaptive filter, the design of computationally efficient acoustic echo cancellers would be feasible. View full abstract»

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  • Predistortion linearization of GaN power amplifier in digital radio links

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    This paper investigates the feasibility of using diode-based predistortion for linearizing GaN power amplifier used in digital radio links. The predistortion linearizer circuit is built around diodes and resistors and can be operated from a DC supply voltage as low as 1 V. The proposed linearized amplifier is tested using QPSK signals. The results shows an improved performance for output powers up to 36 dBm. View full abstract»

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  • A study of V2O4-PEPC composite based resistance temperature sensors

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    In this study V2O4-PEPC composite based temperature sensors were designed and fabricated by drop-casting the blend of V2O4-PEPC microcomposite into thin films between the gap of preliminary deposited electrodes on a glass substrates. The blend was prepared by mixing 10 wt.% vanadium oxide (V2O4) micro-powder and 2 wt.% poly-N-epoxypropylcarbazole (PEPC) in 1 ml of benzol. The thickness of the V2O4-PEPC films was in the range of 20-40 μm. The gap between silver electrodes was in the range 30-40 μm. The length of silver electrodes was equal to 15 mm. It was found that with increase in temperature from 33 °C to 90 °C the AC resistance of the samples decreases by 10-12 times. The resistance-temperature relationships were simulated. View full abstract»

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  • Economic load flow using Lagrange neural network

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    This paper proposed an artificial neural network (ANN) approach based on Lagrangian multiplier method (Lagrangian ANN) to solve the problem of economic load flow in a power system. Operational requirements and transmission losses are also taken care by the proposed approach. Power plant operating costs are represented by exponential cost functions. Simulation on a test example with six generating units shows that the proposed method can efficiently and accurately solve the problem of economic load flow. View full abstract»

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  • Characterization and simulation of optimized micro paddle bridge resonator for magnetic field measurements

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    A novel design of micro paddle bridge resonant magnetic field sensor based on electrostatic actuation and capacitive detection technique is characterized and simulated using CoventorWare. The sensor consists of Aluminum plus shape paddle bridge resonator with two proof mass arms, driving electrodes, sensing electrode and silicon substrate. Working in a resonant condition, the sensor's vibration amplitude is converted into the sensing capacitance change, which reflects the outside magnetic flux-density. Based on the simulation, the key structure parameters are optimized and the resonant frequency is estimated. The results of the device are in accordance with the theoretical values of the designed model. The results indicate its sensitivity 0.252 pA/uT, when operating at 10% of critical damping. The sensitivity and resolution can be enhanced through vacuum packaging. View full abstract»

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  • Fusion of multispectral palmprint images for automatic person identification

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    Reliability and accuracy in personal identification system is a dominant concern to the security world. Biometric has gained much attention in this subject recently. Many types of personal identification systems have been developed, and palmprint identification is one of the emerging technologies. This paper presents a novel biometric technique to automatic personal identification system using multispectral palmprint technology. In this method, each of spectrum images are aligned and then used to extract palmprint features using 1D log-Gabor filter. These features are then examined for their individual and combined performances. Finally, the hamming distance is used for matching of palmprint features. The experimental results showed that the proposed method achieve an excellent identification rate and provide more security. View full abstract»

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  • SIP overload control using automatic classification

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    As the Session Initiation Protocol (SIP) becomes more and more the core of the communication networks convergence, there is urgent need to manage the critical problem of SIP service availability under extreme overload. This paper proposes a novel solution to control SIP overload. We demonstrate the efficiency of the approach compared with a well known SIP overload control algorithm. The solution builds on monitoring a set of SIP servers' features and uses Support Vector Machines to classify traffic behavior as problematic or not. The validation of the proposed solution is performed through experiments. View full abstract»

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  • Effect of negative permittivity and permeability in the transmission of electromagnetic waves through a left-handed material waveguide

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    We investigate the characteristics of electromagnetic wave transmission by multilayered structures consisting of a pair of left-handed material (LHM) and dielectric slabs inserted between two semi-infinite dielectric media. The theoretical aspect is based on Maxwell's equations and matching the boundary conditions for the electric and magnetic fields of the incident waves at each layer interface. We calculate the reflected and transmitted powers of the multilayered structure taking into account the widths of the slabs and the frequency dependence of permittivity and permeability of the LHM. The obtained results satisfy the law of conservation of energy. We show that if the semi-infinite dielectric media have the same refractive index and the slabs have the same width, then the reflected power can be minimized and the transmittance-frequency curve shows no ripple. On the other hand if the semi-infinite dielectric media have different values of refractive indices and the slabs have different widths, then under certain conditions the reflected power can be maximized. View full abstract»

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  • Resistance strain sensors based on quasi-one-dimension Ph3MeP(TCNQ)2 crystals

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (91 KB) |  | HTML iconHTML  

    In this paper, the experimental results on the investigation of electric properties of organic semiconductor resistance strain sensors based on quasi-one dimensional ion-radical salts of tetracyanoquinodimethane and three phenyl methyl phosphonium [Ph3MeP(TCNQ)2] are described. It was observed that the sensitivity of the resistance strain sensors based on twinned crystals is significantly larger than that of uniform crystals. View full abstract»

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