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IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING

المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم

ISSN: 18119212
Publisher: University of Technology
Faculty: Control and Systems Engineering
Language: English

This journal is Open Access

About

The Iraqi Journal of Computers,Communications,Control and Systems Engineering (IJCCCE) is a quarterly engineering journal issued by the University of Technology /Baghdad ,aiming to enrich the knowledge in computer,communication and control fields .

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Contact info

IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING
University of Technology P.O.BOX. 18310
Baghdad,Iraq .
ijccce_uot@uotechnology.edu.iq
ijccce_uot@yahoo.com

Table of content: 2018 volume:18 issue:3

Article
Design and Implementation of a Pneumatic Servo System using Conventional Direction Control Valve

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Abstract

Pneumatic servo systems are widely used in industrial applications but they are expensive, so decreasing their cost contribute in decreasing products manufacturing cost. In this research a pneumatic servo system (PSS) was designed and implemented using cheap conventional directional control valve (CDCV) instead of expensive servo or proportional valves. The CDCV was driven using pulse width modulation (PWM) technique, which was generated in the LabVIEW program and send to the CDCV via Arduino uno microcontroller board. A fuzzy PI controller was designed and implemented to overcome the nonlinearity inherent in air systems, resulting from air compressibility and dry friction, and the nonlinearity resulting from the use of a CDCV which is a digital valve. It is found that getting acceptable results require using PWM technique with frequencies greater than 90 Hz. The results showed that increasing the applied pressure leads to a significant decrease in the rising time but accompanied with a noticeable increase in the ripple amplitude. So, getting accepted results require choosing the applied pressure experimentally to suit the applied load, since they are affected by the applied load.


Article
Design Of Speed Controller For Three Phase Induction Motor Using Fuzzy Logic Approach

Authors: Walaa H. Nasser --- Farazdaq R.Yaseen
Pages: 12-25
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Abstract

The use of Induction Motor (IM) has been increased becuase of it’s robust construction , simple design , and low cost . This paper presents a methodology for the application and performance of Fuzzy like PI Controller to set the frequency of Space Vector Pulse-Width modualtion (SVPWM) Inverter applied to closed loop speed control of IM. When the controller is used with current controller, the quadratic component of stator current is estimated by the controller. Instead of using current controller, this paper proposes estimating the frequency of stator voltage. The dyanamic modelling of the IM is presented by dq axis theory. From the simulation results, the superiority of the suggested controller can be observed in controlling the speed of the three-phase IM.


Article
Improve the Recognition of Spoken Arabic Letter Based on Statistical Features

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Abstract

The recognition and classification of languages represent a vital factor in the computer interaction. This paper presents Arabic Sign Language recognition, which is represented as an appealing application. The work in this paper is based on three steps; preprocessing, feature extraction and classification (Recognition). The statistical features have been used than the physical features, while Multilayer feed-forward neural network as classification methods. The recognition percent is 96.33% has been gained over-perform the earlier works. The simulation has been made by using Matlab 2015b.

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Article
PAPR Reduction in Coherent Optical OFDM System using Modified Sliding Norm Transformer

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Abstract

Orthogonal Frequency Division Multiplexing is one of the most important multiple carrier modulation format, which has many applications in wireless communication and optical communication. It is considered as an excellent method for fast optical communication inferable from its high spectral efficiency and its strength to path losses. Peak to average power ratio is regarded as one of the main problems that are experienced by the optical orthogonal frequency division multiplexing system, which directly affects the characteristics of the system. The current paper proposes an efficient technique to reduce Peak to Average Power Ratio by the modified Dursun’s method or the so called modified discrete sliding norm transformer in coherent optical orthogonal frequency division multiplexing system for the first time to the base of our knowledge consequently. The proposed technique does not need to send side information to the receiver; also, it does not degrade bandwidth. This algorithm lessens Peak to Average Power Ratio in the optical coherent Orthogonal Frequency Division Multiplexing system to about 4.15 dB at complementary cumulative distribution function (CCDF) probability of 10-3 and improves the system performance.


Article
Study the Effect of Spreading Factor value on the Performance of Chaotic Modulation Schemes

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Abstract

High data rate and bandwidth efficiency are the requirements of modern wireless systems. Most studies introduce different ways to develop communication systems to meet these requirements. The researches in the last few years focused on the chaotic system as a chaotic modulation due to its nature. So that the performances of various chaotic modulation schemes (Initial Condition Modulation (ICM) and Chaotic Shift Keying (CSK)) in terms of bit error rate (BER), for different spreading factors are implemented in this article and simulated using MATLAB 2016b simulation. The main objective of this paper is to make a comparison of various chaotic modulation schemes under AWGN channel and study the effect of the spreading factor (β) on the performance of different chaotic modulation schemes, where the spreading factor (β) is the number of generated chaotic signal samples during the bit period (Tb). Different values of spreading factor (12, 16, 20, 40, 60, 80, and 100) samples are selected to implement various chaotic modulation schemes. The results show that the spreading factor value of (100) achieves good performance for all types of chaotic modulation schemes which are implemented here. Increasing the value of spreading factor over (100) such as (120, 140, and 180) will add a little bit enhancement to the system, whilst the processing time will increase dramatically.


Article
Face Recognition Based on Viola-Jones Face Detection Method and Principle Component Analysis (PCA)

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Abstract

Face recognition is one of the most important research fields of the last two decades. This is due to the actual use of this technology in automatic detection and monitoring systems. Face attribute and features recognition from images is still a challenge. In this paper, face image recognition is proposed upon local face image rather than focusing on the whole image recognition by applying preprocessing techniques and Viola-Jones method. Principal Component Analysis (PCA) method is used in order to extract the needed features. Experiments show satisfied and more accurate results achieved by the proposed system comparing to the existing systems.


Article
Mitigate PAPR Effect in Optical Orthogonal Frequency Division Multiplexing Using Companding Technique

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Abstract

orthogonal frequency division multiplexing (OFDM) is emerging as the leading technology for high data rates. The OFDM based on multicarrier transmission that transforms a wideband channel into a group of thin-band channels. The high peak to average power ratio (PAPR) considers the main drawback factor in this system, so the companding technique modifies the amplitude of OFDM signal to reduce this factor. The proposed A-law companding technique has been implemented in intensity modulation/direct detection optical orthogonal frequency division multiplexing (IM/DDOOFDM). The proposed companding scheme guarantees the improved performance in terms of bit error rate (BER) and quality factor (QF) while reducing PAPR effectively and efficiently by modifying the amplitude of the transmitted signals. Our results confirm that the suggested scheme exhibits a good ability to reduce PAPR and a good BER performance based on the use the A factor. At the complementary cumulative distribution function (CCDF) of 10- 3, the PAPR value of our proposed scheme is about 4.4 dB lower than those of un-companded signal at best control factor used of A at 87.6, accordingly the QF is 2.5 dB and the BER is 6.2×10-3 at a distance 900km without any equalization technique or training sequence or any channel estimation.

Table of content: volume:18 issue:3