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27,404 Article Results

Performance Analysis of Digital Modulation for Coherent Detection of OFDM Scheme on Radio over Fiber System

10.11591/ijece.v6i3.pp1086-1095
Fauza Khair , Fakhriy Hario P , I Wayan Mustika , Budi Setiyanto
Radio over fiber (RoF) system with the coherent detection offers high linearity for the transparent transport of high-frequency microwave signals, and better receiver sensitivity compared with intensity-modulated direct detection systems. The purpose of this paper is to analyze the performance of digital modulation for coherent detection of orthogonal frequency division multiplexing (OFDM) scheme on RoF system at 10 Gbps up to 100 km fiber length. The results show that coherent detection of OFDM-RoF system with 16 quadrature amplitude modulation (16-QAM) has the value of  bit error rate (BER) and the symbol error rate (SER) is very low and its constellation is better compared with other modulation formats (4-QAM, quadrature phase shift keying (QPSK), 8-PSK and 16-PSK), which BER 16-QAM is 0.053 and SER is 15.7%. The results also show that BER value of 4-QAM and QPSK relatively similar to fiber length variations. In general, an increasing value of the BER and SER for each modulation format are almost equal to the fiber length of 60-70 km (Region I and II). However, there is a significant increase in the value of BER in fiber length of 80-100 km (Region III. A and III. B) for the modulation of 4-QAM, QPSK, 8-PSK, and 16-PSK.
Volume: 6
Issue: 3
Page: 1086-1095
Publish at: 2016-06-01

Estimation of Excitation Capacitance Requirement of an Isolated Multi-phase Induction Generator for Power Generation

10.11591/ijpeds.v7.i2.pp561-567
Alok Kumar Mohanty , K B Yadav
Self Excited induction generators are used in remote places for electrical power generation from both conventional as well as non-conventional sources. An Induction generator can operate as a capacitor excited machine provided the machine is driven beyond synchronous speed and a suitable capacitor is connected across its terminals. In this paper a technique has been proposed to estimate the values of excitation capacitances to maintain desired terminal voltages in a multi-phase induction generator. A mathematical model using nodal admittance technique of a six-phase induction generator has been analyzed. Genetic algorithm technique is applied here to obtain the unknown parameters and the capacitance requirements to obtain desired terminal voltages under various operating conditions.
Volume: 7
Issue: 2
Page: 561-567
Publish at: 2016-06-01

Referenced Approximation Technique for a Rom-Less Sweep Frequency Synthesizer

10.11591/ijece.v6i3.pp1213-1222
Atman Jbari , Larbi Bellarbi , Abdelhamid Errachid
The main goal of this paper is to present a novel ROM-less direct digital frequency synthesizer for sweep instrumentation systems. It provides a main sweep channel for frequency analysis and a reference channel for phase and amplitude measurement block operating at constant frequency. For phase to amplitude converter, we propose a new trigonometric approximation technique based on a set of reference angles. In addition, we present the design of the proposed synthesizer and its evaluation in Matlab-Simulink environment. The simulation results illustrate the performances and demonstrate the effectiveness of our proposed circuit.
Volume: 6
Issue: 3
Page: 1213-1222
Publish at: 2016-06-01

Permanent Magnet Synchronous Motor Design using Grey Wolf Optimizer Algorithm

10.11591/ijece.v6i3.pp1353-1362
Yannis L Karnavas , Ioannis D Chasiotis , Emmanouil L Peponakis
Common high-torque low-speed motor drive schemes combine an induction motor coupled to the load by a mechanical subsystem which consists of gears, belt/pulleys or camshafts. Consequently, these setups present an inherent drawback regarding to maintenance needs, high costs and overall system deficiency. Thus, the replacement of such a conventional drive with a properly designed low speed permanent magnet synchronous motor (PMSM) directly coupled to the load, provides an attractive alternative. In this context, the paper deals with the design evaluation of a 5kW/50rpm radial flux PMSM with surface-mounted permanent magnets and inner rotor topology. Since the main goal is the minimization of the machine's total losses and therefore the maximization of its efficiency, the design is conducted by solving an optimization problem. For this purpose, the application of a new meta-heuristic optimization method called “Grey Wolf Optimizer” is studied. The effectiveness of the method in finding appropriate PMSM designs is then evaluated. The obtained results of the applied method reveal satisfactorily enhanced design solutions and performance when compared with those of other optimization techniques.
Volume: 6
Issue: 3
Page: 1353-1362
Publish at: 2016-06-01

Two-way Mechanism to Enhance Confidentiality and Accuracy of Shared Information

10.11591/ijece.v6i4.pp1785-1791
Manash Pratim Dutta , Subhasish Banerjee , Swarnendu Kumar Chakraborty , Chandan Tilak Bhunia
As such internet and information technology have influenced the human life significantly thus the current technology cannot solely assure the security of shared information. Hence, to fulfil such requirements mass amount of research have been undertaken by various researchers among which one of the mechanisms is the use of dynamic key rather than static one. In this regard, we have proposed a method of key generation to provide the dynamic keys. The scheme not only can change the key but also provide the error control mechanism. At the end of this paper, a comparison with the existing techniques has also been made to prove the efficiency of the proposed scheme.
Volume: 6
Issue: 4
Page: 1785-1791
Publish at: 2016-05-14

Analysis and Design of High Gain NRI Superstrate Based Antenna for RF Energy Harvesting System

10.11591/ijeecs.v2.i3.pp647-656
K.K.A. Devi , C. H. Ng
A high gain patch antenna inspired by 4 layers of negative refractive index (NRI) metamaterial superstrate is proposed to operate at downlink radio frequency (RF) band (935 MHz to 960 MHz of GSM 900). The metamaterial unit cell consists of a nested split ring resonator (SRR) and strip line laminated on other side of FR4 substrate. The effective permittivity and permeability of the proposed unit cell are designed synchronously to approach zero, which leads the NRI superstrate to have impedance match with zero and negative refractive index.The NRI superstrate is studied using Fabry-Perot (F-P) resonant cavity. The gain is improved by 82.48% at the air gap of 55 mm in the desired frequency band.Therefore, the gain of the antenna is effectively enhanced based on the negative refractive index metamaterial. The measured radiation pattern and S parameter results also showed that it has good agreement with the simulation results.
Volume: 2
Issue: 3
Page: 647-656
Publish at: 2016-05-07

Hardware Implementation of Induction Motor using ANN Controller under Low Speed Operation

10.11591/ijeecs.v2.i3.pp522-529
Saranya R , Thangavel S
For the high performance drives the artificial neural network based Induction motor is proposed. During the load variation, the performance of the Induction motor proves to be low. Intelligent controller provided for controlling the speed of induction motor especially with high dynamic disturbances. An effective sensorless strategy based on artificial neural network controller is developed to estimate rotor’s position and to regulate the stator flux under low speed, helps to track the motor speed accurately during the whole operating region. The overall combination of this setup is simulated in the MATLAB/SIMULINK platform. Finally an experimental prototype of the proposed drive has been developed to validate the performance of Induction Motor and the dynamic speed response of Induction motor with proposed controller was estimated for various speed and found that the speed can be controlled effectively.
Volume: 2
Issue: 3
Page: 522-529
Publish at: 2016-05-07

Reducing Computational Complexity and Enhancing Performance of IKSD Algorithm for Encoded MIMO Systems

10.11591/ijeecs.v2.i3.pp636-646
Mohammed Qasim Sulttan
The main challenge in MIMO systems is how to design the MIMO detection algorithms with lowest computational complexity and high performance that capable of accurately detecting the transmitted signals. In last valuable research results, it had been proved the Maximum Likelihood Detection (MLD) as the optimum one, but this algorithm has an exponential complexity especially with increasing of a number of transmit antennas and constellation size making it an impractical for implementation. However, there are alternative algorithms such as the K-best sphere detection (KSD) and Improved K-best sphere detection (IKSD) which can achieve a close to Maximum Likelihood (ML) performance and less computational complexity. In this paper, we have proposed an enhancing IKSD algorithm by adding the combining of column norm ordering (channel ordering) with Manhattan metric to enhance the performance and reduce the computational complexity. The simulation results show us that the channel ordering approach enhances the performance and reduces the complexity, and Manhattan metric alone can reduce the complexity. Therefore, the combined channel ordering approach with Manhattan metric enhances the performance and much reduces the complexity more than if we used the channel ordering approach alone. So our proposed algorithm can be considered a feasible complexity reduction scheme and suitable for practical implementation.
Volume: 2
Issue: 3
Page: 636-646
Publish at: 2016-05-07

Model Predictive Current Control of Grid Connected PV Systems

10.11591/ijeecs.v2.i2.pp285-296
Satya Ravi Rai , Jaya Kumar S V , Keerthi Deepika K
This paper deals with the design and simulation of an efficient solar photovoltaic system with a maximum power point tracking system (MPPT). Maximum power point (MPP) is obtained by using Perturb and Observe (P&O) algorithm. The output from solar panel is fed to the DC-DC (Boost) converter which steps up the output voltage. It is then fed to a 3-phase inverter. The inverter used is a 3-phase two-level inverter implemented with a Model Predictive Control strategy. Model of the system is considered in order to predict the control variables. Optimum switching state is selected by minimizing the cost function for each sampling period. This is achieved through modelling and MATLAB simulation of various stages that constitute the overall system.
Volume: 2
Issue: 2
Page: 285-296
Publish at: 2016-05-01

Capacitor Voltage Balancing of Five Level Diode Clamped Converter based STATCOM

10.11591/ijeecs.v2.i2.pp259-267
D. Sindhuja , V. Yuvaraju M.E.
The power quality determines the fitness of the electrical power to the consumer devices. To improve the quality of the power delivered many compensating devices are used. The FACTS devices are normally used to reduce the power quality problems by inducing one or more AC transmission parameters. The static synchronous compensator (STATCOM) can act as either a source or sink of reactive AC power to an electricity network. The basic electronic block of the STATCOM is the voltage-source inverter that converts an input dc voltage into a three-phase output voltage. The STATCOM employs an inverter in order to obtain the voltage source of adjustable magnitude and phase from the DC link voltage on the capacitor. In this model, the STATCOM is designed with the five level diode clamped converter (DCC) controlled by space vector pulse width modulation (SVPWM) technique. The space vector technique with α, β frame is referred here. The dc link capacitor voltage equalization for the five level diode clamped converter was explained. The Total Harmonic Distortion of the source current will be considerably reduced.
Volume: 2
Issue: 2
Page: 259-267
Publish at: 2016-05-01

Energy Preservation in Heterogeneous Wireless Sensor Networks through Zone Partitioning

10.11591/ijeecs.v2.i2.pp390-395
Shahzad Hassan , Muhammad S.Nisar , Hongbo Jiang
Energy preservation is critical task in the wireless sensor networks and the energy cost increases proportionally as the transmission distance increases. Since nodes are equipped with limited energy it is very crucial to decrease the energy consumption by decreasing the communication distance between the nodes. In clustering protocols inter-cluster and intra-cluster communication is most neglected part. We have proposed a new zone based clustering protocol which reduces the intra- clustering and inter-clustering transmission distance between the communicating nodes. Experimental results reveal that our proposed protocols have outperformed the compared protocols in terms of stability period, instability period and throughput.
Volume: 2
Issue: 2
Page: 390-395
Publish at: 2016-05-01

Extension of Linear Channels Identification Algorithms to Non Linear Using Selected Order Cumulants

10.11591/ijeecs.v2.i2.pp334-343
Mohammed Zidane , Said Safi , Mohamed Sabri
In this paper, we present an extension of linear communication channels identification algorithms to non linear channels using higher order cumulants (HOC). In the one hand, we develop a theoretical analysis of non linear quadratic systems using second and third order cumulants. In the other hand, the relationship linking cumulants and the coefficients of non linear channels presented in the linear case is extended to the general case of the non linear quadratic systems identification. This theoretical development is used to develop three non linear algorithms based on third and fourth order cumulants respectively. Numerical simulation results example show that the proposed methods able to estimate the impulse response parameterswith different precision.
Volume: 2
Issue: 2
Page: 334-343
Publish at: 2016-05-01

The Gender Effects of Heart Rate Variability Response during Short-Term Exercise using Stair Stepper from Statistical Analysis

10.11591/ijeecs.v2.i2.pp359-366
Nor Aziyatul Izni Mohd Rosli , Mohd Azizi Abdul Rahman , Malarvili Balakrishnan , Takashi Komeda , Saiful Amri Mazlan , Hairi Zamzuri
This study is aimed to explore the Heart Rate Variability (HRV) response during short-term exercise by stair stepper and to compare the finding between young healthy male and female subjects. The responses were statistically analyzed by applying independent-samples t-test statistical method. The calculation of Coefficient of Variation (CoV (%)) and the slope of the linear regression is used to assess the steadiness of the HRV. Furthermore, the results also demonstrated that female subjects had greater significant p-value of RMSSD feature and significance p-value in a LF feature is greater in male. Thus, the ongoing results demonstrated that males have the sympathetic drive and females have predominant parasympathetic drive using short-term exercise by stepper. Thus, the experiment results indicate the suitability of developing rehabilitation devices in the field of Autonomic Nervous System (ANS), research, control system and rehabilitation enginering, which may help to isolate males and females.
Volume: 2
Issue: 2
Page: 359-366
Publish at: 2016-05-01

A Power Efficient Trust Based SecureRouting Scheme for Mobile Ad-Hoc Networks

10.11591/ijeecs.v2.i2.pp417-425
M V Rathnamma , P. Chenna Reddy
MANETs are self-organizing, infrastructure less ad-hoc networks with many challenges like low power, limited storage and limited processing devices. Among all the parameters that affect the network efficiency accuracy, scalability, and power consumption are main challenges in the routing of Mobile ad-hoc networks. The network lifetime is dependent on the power efficiency of the nodes in the network. The protocols have to provide the energy efficient route through intermediate nodes in the network. The trust based routing approach is one of the best mechanisms to establish an energy efficient route between source and destination. In this paper we first propose the family relationship based trust model and then propose a new energy efficient trust based routing protocol to reduce the routing overhead, delay and provides better packet delivery ratio that performs better than the existing routing protocols.
Volume: 2
Issue: 2
Page: 417-425
Publish at: 2016-05-01

Reconfiguration of Distribution Networks with Presence of DGs to improving the Reliability

10.11591/ijeecs.v2.i2.pp241-247
Amir Sabbagh Alvani , Seyed Mehdi Mahaei
In this paper, the network reconfiguration in the presence of distributed generation units with the aim of improving the reliability of the network is studied. For this purpose four reliability parameters in the objective function are considered, which is average energy not supplied system average interruption frequency index, system average interruption duration index and momentary average interruption frequency index. The new method will be normalized objective function. Another suggestion of this paper are considering the different fault rates, locating time of faults type and prioritization of customers based on their importance. This nonlinear problem has optimized by particle swarm optimization (PSO) algorithm.
Volume: 2
Issue: 2
Page: 241-247
Publish at: 2016-05-01
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