Index of EWU Authors - East West University

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Abstract of Published Papers 2008Sciences and EngineeringJournal of Discrete Mathematical Sciences and Cryptography, Vol. 11 No. 3, pp. 267-279,New Delhi, India, June 2008, (ISSN 0972-0529), http:// www.connectjournals.com/jdmscPerformance Evaluation of Rake Receiver of DS-CDMA under AWGNEnvironmentsM. Imdadul Islam*, M. Zulhasnine*, M.R. Amin**AbstractHigh speed data, particularly, direct sequence code-division multiple access (DS-CDMA)experiences inter symbol interference (ISI) in wireless communications due to delaydifferences of multipath propagations. Rake receiver is an effective method of recovery ofbaseband signal for wideband CDMA (WCDMA) under multipath environments. This paperdeals with bit error rate (BER) performance of a Rake receiver for multipath wireless CDMAcontaminated by additive white Gaussian noise (AWGN), and impact of fingers on receptionof fading channel signal.Keywords – DS-CDMA, PN sequences, AWGN, BER, ISI and Multipath channel.* Department of Computer Science and Engineering, Jahangirnagar University, Savar, DhakaEmail address: imdad@juniv.edu** Department of Electronics and Communications Engineering East West University, 43Mohakhali Dhaka-1212. Email address: ramin@ewubd.edu35
Abstract of Published Papers 2008Sciences and EngineeringJournal of Discrete Mathematical Sciences and Cryptography, Vol. 11 No. 6, pp. 705-714,New Delhi, India, Dec.2008, (ISSN 0972-0529), http:// www.connectjournals.com/jdmscDynamic Channel Allocation in Mobile Cellular NetworksShahrina Mou *, Md. Imdadul Islam**, M.R. Amin*AbstractChannel assignment problem is one of the main issues in radio networks. Having limitednumber of possible channels and unlimited demands it has become a challenge for thenetwork planners to allocate channels in optimize ways. In the early days of radio technology,conflict free fixed channel assignment was the main target. But in the present days, dynamicchannel allocation is used. In this paper, an algorithm has been developed, which will be ableto allocate channels dynamically. In a certain area, there can be different demands; in themorning the demand may be increased and in the evening the demand may be reduced. Thisalgorithm, based on Greedy method, is able to assign the radio channels dynamicallyaccording to dynamic demands.Keywords – Dynamic channel allocation, co-channel constraint, adjacent channel constraintcomposite channel constraint.* Department of Electronics and Communications Engineering, East West University 43Mohakhali Dhaka-1212. Email address: ramin@ewubd.edu** Department of Computer Science and Engineering, Jahangirnagar University, SavarDhaka. Email address: imdad@juniv.edu36
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