Volume 2, Issue 8, September 2012

The Performance of Optical CDMA Access Network for Point to Multipoint Configuration using Spectral Detection Technique [Download Paper]

M.M.Ismail, M.A.Othman, H.A.Sulaiman, M.H.Misran and M.A.Meor Said

Abstract—In this paper, we are proposing a detection scheme known as spectral direct detection technique implemented with Fiber Bragg Grating (FBG) act as encoder/decoder. This FBG based is used to encode and decode the spectral amplitude coding namely modified double weight (MDW) code in Optical Code Division Multiple Access (OCDMA). This code is used due to its flexibility where its weight can be any even number that greater than two. Moreover, it can maintain the cross-correlation parameter equal to one. The simulation will be carried out using OptiSystem version 7.0 and the performance is characterised through bit error rate (BER) and power received at various bit rate 


Designing of Low Loss Dielectric Resonator Filter [Download Paper]

Engr. Muhammad Yameen, Engr. Sharjeel Afridi and Engr. Jamil Ahmed

Abstract - Emerging wireless, space and satellite communication links require light weight, low loss, temperature stable and inexpensive communication devices. Microwave filters are the key element of any communication system or microwave link. Microwave filters are usually implemented by using waveguide, coaxial, microstrip or lumped element resonators. Only dielectric resonator filters provide best combination of volume versus insertion loss of filter. Dielectric resonator filters offer very high Q factors to provide lowest pass band insertion loss and higher selectivity with compactness and minimal power requirements. And satisfy vital demand of emerging space communication systems and cellular industry by offering very high-quality factor due to their inherent low loss material. This paper describes basic steps to design dielectric resonator filter with the help of a 3D finite-element method (FEM) simulation tool, Ansoft HFSS (High Frequency Structure Simulator). Dielectric disks are used to tune the filter response within a limited range. 

A Metric Suite for Requirement Based Test Effort Estimation using the role of IRBC and TCF [Download Paper]

Ganesh Kumar and Dr. Pradeep Kumar Bhatia

Abstract - The Software testing is one of the most important and critical activity of software development life cycle which ensures software quality and directly influences the development cost and success of the software. This paper presents a systematic and an integrated approach for the estimation of software development and testing effort on the basis of improved requirement based complexity (IRBC) and technical complexity factor (TCF) of the proposed software. The IRBC measure serves as the basis for estimation of these software development activities to enable the developers and practitioners to predict the critical information about the software development intricacies and obtained from software requirement specification (SRS) of proposed software. Hence, this paper presents an integrated approach, for the prediction of software development and testing effort using IRBC. The computation of proposed test effort estimation involves least overhead as compared to others.