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Modeling of Mimo Radio Channels for Mobile-To-Mobile and Umbrella Cell Based Cellular Communication Systems

Thesis Info

Access Option

External Link

Author

Wani, Mohd Yaqoob

Program

PhD

Institute

Capital University of Science & Technology

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2017-09

Thesis Completion Status

Completed

Subject

Electrical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9225/1/Mohd_Yaqoob_Wireless_Communication_HSR_2017_CUST_23.01.2018.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727791534

Similar


Mobile-to-mobile (M2M) andxed-to-mobile (F2M) communication technology has shown astonishing intrusion in battle- elds, cellular and vehicular networks, intelligent transportation systems and internet of things. Mobile nodes involved in these infrastructures demand a high data rate connectivity over radio fading links. This dissertation concentrates on the geometrical modeling of the spatial characteristics of two-dimensional (2D) and three-dimensional (3D) radio fading channel for multiple-input-multiple-output (MIMO) M2M and MIMO F2M communication scenarios. Closed-form expressions for the joint and marginal space-time correlation functions among MIMO antenna array elements and probability density function (PDF) of angle-of-arrival (AoA) of the multipaths in nonisotropic environments are presented. Initially, the emphasis has been on the 2D propagation scenario; where, mobile subscribers are equipped with low elevated multiple antenna array structures and they intend to communicate on the move without any base station (BS). These mobile subscribers usually reside on structured-bounded highways or in the \long and narrow" streets and canyons; where, the distribution of scattering objects along the roadside regions are non-isotropic in nature. It is observed that elliptical geometry is an appropriate shape, which correlates more accurately the layout of such propagation environments than the circular shape. In the proposed model, it is assumed that the mobile stations reside at the centers of two di erent ellipses and the scatterers are distributed uniformly along the boundaries of the ellipses. The ellipses are independently rotatable along the horizontal plane corresponding to the direction of mobile stations. The lengths of major and minor axes and the eccentricities of the ellipses are assumed to be dependant on the physical measurement of the propagation environments. Using the proposed geometrical model, the closed-form expression of PDF of AoA/AoD is obtained for non-isotropic scattering environments. Based on this AoA/AoD, mathematical expression of joint and marginal PDFs of space-time correlations among the MIMO antenna elements are derived. The 2D eccentricity based channel model is then extended to 3D ellipticalbased cylindrical channel model to accommodate the high-rise structures present along the roadside premises of highways, streets or canyons. In this model, the scattering objects are assumed to be placed on the surfaces of the elliptical-based x cylinders around both transmitter and receiver nodes. The horizontal dimension of the physical propagation medium is modeled by eccentricity and height of the scatterers are modeled by the height of cylinders. Mobile stations are placed at the centers of the cylinders equipped with multiple antenna arrays. The dimension of cylinders are independently adjustable and rotatable according to the physical dimension of the propagation medium and the direction of motion of MS''s. Here again the mathematical expressions for correlations among MIMO M2M links are formulated and the obtained theoretical results are simulated and compared with the measured data. In the last part of thesis, a 3D elliptical based geometrical channel model is proposed to model umbrella-cell in a cellular communication environment, which provides trustworthy communication links for speedy vehicles on the highways. In the proposed model, mobile subscriber is assumed to be located at the center of the elliptical cylinder equipped with low-rise antenna array and the scatterers are assumed to be uniformly distributed on the surface of the cylinder; whereas, the BS is on the top of high-rise tower with multiple antenna structure and is assumed to be scatter-free. Using the proposed model an expression for space-time correlation among antenna elements is derived.
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استحکام خاندان میں زوجین کا کردار: سیرت طیبہ کا عملی و اطلاقی مطالعہ

In this universe, the most important relationship among the humans is marriage, other relations exist on the basis of this relationship. In the Holy Quran, the relationship of spouses has been mentioned as a source of mutual peace and love. In our society, it is said that women organize a home, but in reality a home can not be establish alone, spouses together make and adorn it with painstaking efforts. Man plays pivotal role in the relationship of spouses. So the responsibility of stability of the family lies on the man much more than the women and its reason is superiority. We find many examples from the marital life of our Prophet(S.A.W.W). This paper will highlight the teachings of Prophet Muhammad (S.A.W.W) about the role of spouses in the establishment of a family.

Studies of the Formulation and Evaluation of Controlled Release Matrix Tablets With Selected Anti-Diabetic Drugs

Acarbose, an oral a-glycosidase inhibitor, is frequently employed for management of Non-Insulin dependent diabetes. Primarily it deeds by reducing plasma glucose level through slothful absorption of starches and sugars from intestine.Glipizide & Repaglinide, are 2nd generation sulfonyl-urea and act, by increasing insulin secretion, but binds to different betacell receptor sites. They are used alone / adjunct to diet to the management of type-II (non-insulin dependent) diabetes mellitus in patients whose hyper-glycemia cannot be controlled by diet and exercise alone.Owing to their short half life, dosage frequency / schedule, patient non-compliance, economic factors and adverse effects on GIT, they are wellthought-out to be good candidates for preparation into Modified release, dosage forms. Keeping this in view during pre-formulation work, emphasis was laid on detailed study of parameters such as optical-rotation, melting-point, %age-purity, particle-size, sizedistribution, solubility at different temperatures & pH, FTIR spectra for conformation, λ max determination, micro-meritic properties of selected drug(s), polymers and in-active ingredients used in this research work. DSC and FTiR studies were done to check interaction of drug with polymers and excipients.During this study attention was also concentrated on some contributing approaches to improve the dissolution rates of Glipizide & Repaglinide, which are insoluble/sparingly soluble drug(s). For this purpose solid dispersions of Glipizide & Repaglinide, were prepared by solvent evaporation technique, using Carbopole,, as dispersion carrier. The drug carrier interactions were studied through SEM, DSC, FTIR & X-ray diffraction analysis. The influence of proportional amount of the carrier on the dissolution rate of Glipizide & Repaglinide, were also investigated. The results did not show any chemical decomposition or well defined interaction between drugs and carrier, indicating a praiseworthy compatibility amid them. The solid dispersions with Carbopole, demonstrated an evident increase in the dissolution rate and solubility of Glipizide & Repaglinide. The boost in the dissolution rate and solubility of Glipizide & Repaglinide, could be attributed to several factors such as improved wettability, local solubilization, conversion from crystalline form to amorphous form and drugs particle size reduction. Directly compressed CR matrix tablets, using granular Ethocel® standard premium & Ethocel® standard F P premium were aimed, equipped and assessed invitro, in the first instance, followed by invivo evaluation of the best Dept. of Pharmaceutics, Faculty of Pharmacy, Gomal University, D.I.Khan, K.P. products. Physico chemical evaluation of the framed tablets was accomplished, using different physico.chemical, dimensional and QC-tests etc. Findings of all these experiments were found to be with in acceptable range and tablets met the pharmacotechnical requirments. The influence of different viscosity grades of Ethocel® on t h e t ab l et characteristics, drug release rates, release-patterns & release-kinetics were probed. Ethocel® with lower viscosity grades revealed good compressibility, resultant in harder tablets. Particle size and amount of polymer used were found to be the determining factors, in regulating the release rates of Acarbose, Glipizide & Repaglinide, from the tablets. The mechanism of drug release from the tablets seemed to differ from formulation to formulation, principally dependent on the amount of Ethocel® and particle size of the polymer used. More over the research concentrated on the consequence of partial replacement of primary active/ in-active ingredients (lactose) by various coexcipients such as HPMC, starch & CMC on the release rate and mechanism of drugs release from the matrix tablets. All of the coexcipients used improved the release.rates to different extent.Invitro studies revealed that tablet formulations containing polymer Ehocel® standard 7FP-premium, at D: P ratio 010: 3 & 01:3 were the best amidst the preparations for all three drugs (Acarbose, Glipizide & Repaglinide) singly, as they delivered boosted release patterns with optimum amount of the drugs released in 024 hrs, and due to their extended release rates, with either zero or near to zero-order release kinetics.The optimized Acarbose, Glipizide & Repaglinide matrix tablets designs were further used for invitro & invivo bio-availability, bio-equivalence & stabilities studies as compared to the comparative studies with available marketed, conventional tablets of Acarbose, Glipizide & Repaglinide. Stability studies were accomplished on the optimized preparation for a period of 1 year both in ambient and accelerated conditions and the tablets were re-assessed physicochemicaly at different intervals of time. The results attained demonstrated maximum stability for 1 year.The comparative invitro dissolution studies, revealed prolonged release rate of test formulations as 96.39%, 88.09% & 89.73% of Acarbose, Glipizide & Repaglinide released after 24 hours, correspondingly, while in all of the available marketed conventional formulations, drugs were released well before 24 hours. Invivo studies of the best formulated tablets were led by using HPLC based modified techniques meant at analysis of Acarbose, Glipizide & Repaglinide in rabbit’s-plasma. Measured plasma concentrations of the drug(s) were used in calculation of pharmaco-kinetic parameters for the CR, test tablets and reference marketed conventional preparations of Acarbose ,Glipizide & Repaglinide using PK Win Dept. of Pharmaceutics, Faculty of Pharmacy, Gomal University, D.I.Khan, K.P. Nolin, software(Win.Nolin®Ver 5.2.1 (Pharsight Corporation, Mountan.View, CA, USA). Intentionally prolonged Tmax, t1/2 and MRT0-t of the test CR matrix tablets of model drug(s) point toward smooth and extended absorption phase of the drugs under research. The test CR, tablets exhibited better and linear in-vitro & in-vivo correlation as compared to reference marketed, conventional tablet preparations. Conclusion: It is concluded that a good controlled release formulation of Acarbose, Glipizide and Repaglinide can be prepared without risk of possible interactions using Ethocel® standard 7FP and Ethocel® 7 Premium polymer to avoid risk of side effects of Acarbose, Glipizide & Repaglinide and to improve patient compliance. Hence it is determined that acarbose,Glipizide & Repaglinide can be loaded to controlled release matrix tablet for the treatment of diabetes mellitus with better compliance and improve efficacy.