Performance of Different Concatenated Coding Schemes for CDMA System

Zainab Majeed Abid

doi:10.31026/j.eng.2018.12.06

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Publication Date

Mon Dec 03 2018

Journal Name

Journal Of Engineering

Volume

24

Issue Number

12

DOI

10.31026/j.eng.2018.12.06

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Performance of Different Concatenated Coding Schemes for CDMA System

CDMA

concatenated coding

Reed-Solomon code

differential coding

a rake receiver

Zainab Majeed Abid

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In this paper different channel coding and interleaving schemes in DS/CDMA system over multipath fading channel were used. Two types of serially concatenated coding were presented. The first one composed of Reed-Solomon as outer code, convolutional code as inner code and the interleaver between the outer and inner codes and the second consist of convolutional code as outer code, interleaved in the middle and differential code as an inner code. Bit error rate performance of different schemes in multipath fading channel was analyzed and compared. Rack receiver was used in DS/CDMA receiver to combine multipath components in order to enhance the signal to noise ratio at the receiver.

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Publication Date

Sat Feb 01 2014

Journal Name

Journal Of Economics And Administrative Sciences

Strategic Human Resource Management Practices and their reflections for Organizational Performance Improvement A Survey Study of the views of a sample of Managers Baghdad Soft Drinks company/ Zafaraniya

: strategic human resource management practices- strategic human resource management- human resources management strategy- organizational performance- Baghdad soft drinks company.

خالد سلمان

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The aims of research is to identify the role of strategic human resource management Practices in organizational performance improvement in the Baghdad soft drinks company, as well as the implications of the results for both managers and practitioners.

In order to achieve the objectives of the research, the researcher designed questionnaire included (40) items to collect the initial data from the research sample consisting of (53) Single. In light of that has been collecting and analyzing data and test hypotheses using the statistical package for Social Sciences (SPSS21), and use a number of statistical methods to achieve the goal of the research, including the means, standard deviations and simple correla

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Publication Date

Tue Dec 29 2020

Journal Name

Journal Of Accounting And Financial Studies ( Jafs )

Personal tax exemptions "a comparative study with some Arab and European system legislations

Personal tax

Exemptions

Tax

A comparative study

أستاذ مشارك.د. طارق

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This research aims primarily to highlight personal tax exemptions A comparative study with some Arab and European regulations. And by conducting both theoretical comparative analyses. Most important findings of the study is the need to grant personal and family exemptions that differ according to the civil status of the taxpayer (single or married). In other words, the exemption increases as the number of family members depend on its social sense. Also taking into account some incomes that require a certain effort and looking at the tax rates, it is unreasonable for wages to be subject to the same rates applied to commercial profits.

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Publication Date

Sat Oct 01 2016

Journal Name

Journal Of Theoretical And Applied Information Technology

Factors affecting global virtual teams’ performance in software projects

Today the trend is to perform software development work via distributed geographical area among team

individual or even as an organization. However

due to the global market and international presence of many companies

there is a need to implement a global virtual teams. The global virtual team members are gradually engaged in globalized business environments across space

time and organizational boundaries via information and communication technologies. A global virtual team relies on communication

collaboration

and information exchange are the most important criteria in global virtual teams’ operations. The purpose of this paper is to answer two research questions. The first research question is to identify the factors affecting global virtual teams’ performance. A systematic literature review was conducted to answer the first research question. The second research question is on what the rank of the factor affecting the global virtual teams’ performance according to their level of effect on global virtual teams’ performance. Online survey was conducted within 103 developers and IT managers from eight IT companies to answer the second research question. The Statistical Package for Social Science (SPSS 22) was used to analyze the collected data. In this study

we investigated factors that affect global virtual teams’ performance

factors considered include cultural differences

language problems

time-zone differences

team size

technical problems

lack of trust

lack of sufficient training

and ICT problems. Also the findings indicated that lack of sufficient training is the highest level of effect on global virtual teams’ performance. On the other hand

Ali Yahya Gheni

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(23)

Publication Date

Tue Jan 01 2008

Journal Name

J Bagh College Of Dentistry

Assessment of consistency and compressive strength of glass ionomer reinforced by different amount of hydroxyapatite

Consistency

compressive

Glass ionomer

Hydroxyapatite

Mohammed R

Raghad Abdulrazzaq

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Background: Glass ionomers have good biocompatibility and the ability to adhere to both enamel and dentin. However, they have certain demerits, mainly low tensile and compressive strengths. Therefore, this study was done to assess consistency and compressive strength of glass ionomer reinforced by different amount of hydroxyapatite. Materials and Methods: In this study hydroxyapatite materials were added to glass ionomer cement at different ratios, 10%, 15%, 20%, 25% and 30% (by weight). The standard consistency test described in America dental association (ADA) specification No. 8 was used, so that all new base materials could be conveniently mixed and the results would be of comparable value and the compressive strength test described by

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Publication Date

Sun May 10 2015

Journal Name

Al-academy

System formations in contemporary discourse theatrical: حارث حمزة الخفاجي

Harith

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System is one of the concepts that fused stages of human thought his contemplations , and the evolution of his ideas and know the universe and existence , was formed several systems and numerous multi- humanitarian field , for example : the political system , the economic system , the system of philosophical , scientific system ... etc. .The current research around trying to find the identity of the system aesthetic in general and theater in particular , the detection of compositions and how Cklath within shifts functional and conceptual , which confirms the importance of Altgria creative as characterized by the following heading towards experimentation and update ongoing , and in particular what we find in the discourse of postmodernism

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Publication Date

Tue Jul 01 2014

Journal Name

International Journal Of Artificial Intelligence And Mechatronics

Building a Three-Axis CNC Milling Machine Control System

CNC Milling Machine

Stepper Motors

Interpolation

Polylines

DXF

Hayder

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CNC machines are widely used in production fields since they produce similar parts in a minimum time, at higher speed and with possibly minimum error. A control system is designed, implemented and tested to control the operation of a laboratory CNC milling machine having three axes that are moved by using a stepper motor attached to each axis. The control system includes two parts, hardware part and software part, the hardware part used a PC (works as controller) connected to the CNC machine through its parallel port by using designed interface circuit. The software part includes the algorithms needed to control the CNC. The sample needs to be machined is drawn by using one of the drawing software like AUTOCAD or 3D MAX and is saved in a we

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Publication Date

Thu Dec 28 2017

Journal Name

Ibn Al-haitham Journal For Pure And Applied Sciences

Evaluating the Relationship Between GPS Output and Planimetry System

A. R. A.

A. J.

M.N.

K. A.

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. This rtsearch involveda a study of the relationship

between GPS coordinates and planimetry coordinates. It was found that there is a relation between GPS output coordinates and

the coordinates of a distance point from the positi on of the GPS point

. In order to pricist the direction of distance a reference point had been

used which is

( Greenwich Mean observatory) GMO.

The angles between the studying

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Publication Date

Mon Jun 01 2020

Journal Name

Journal Of Engineering

Pilot Based Channel Estimation and Synchronization in OFDM System

Channel estimation

Pilots

STO

Mahmood Mohmmmed saeed

Buthaina Mosa

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Channel estimation and synchronization are considered the most challenging issues in Orthogonal Frequency Division Multiplexing (OFDM) system. OFDM is highly affected by synchronization errors that cause reduction in subcarriers orthogonality, leading to significant performance degradation. The synchronization errors cause two issues: Symbol Time Offset (STO), which produces inter symbol interference (ISI) and Carrier Frequency Offset (CFO), which results in inter carrier interference (ICI). The aim of the research is to simulate Comb type pilot based channel estimation for OFDM system showing the effect of pilot numbers on the channel estimation performance and propose a modified estimation method for STO with less numb

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(3)

Publication Date

Sat Jan 01 2022

Journal Name

Proceedings Of International Conference On Computing And Communication Networks

Automatic Health Speech Prediction System Using Support Vector Machine

Husam

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(3)

Publication Date

Thu Dec 01 2022

Journal Name

Iraqi Journal Of Science

PLAGIARISM DETECTION SYSTEM IN SCIENTIFIC PUBLICATION USING LSTM NETWORKS

Mohammed S. H.

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(2)

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