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Applications of Particle Swarm Optimization to Digital Communication

Thesis Info

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Author

Zubair, Muhammad

Program

PhD

Institute

International Islamic University

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2008

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/413

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725524651

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The whole class of evolutionary computing algorithms is inspired by the process of evolution in nature. Compared to the traditional optimization algorithms, a few striking features of these algorithms include their ability to address non-differentiable cost functions, robustness to the dynamically changing environment, and implementation on parallel machines. However, it was not until one and half decade ago, when these algorithms attracted researchers and got acknowledgement in terms of their application to the real world problems. The main reason behind this increased interest of the researchers owes to the ever increasing computing power. As a result evolutionary computing algorithms have been widely investigated and successfully applied for a number of problems belonging to diverse areas. In this dissertation the standard binary particle swarm optimization (PSO) and its soft version, namely soft PSO (SPSO) have been applied to four different problems of digital communication. Due to the exponentially growing computational complexity with the number of users in optimum maximum likelihood detector (OMLD), suboptimum techniques have received significant attention. We have proposed the SPSO for the multiuser detection (MUD) in synchronous as well as asynchronous multicarrier code division multiple access (MC- CDMA) systems. The performance of SPSO based MUD has been investigated to be near optimum, while its computational complexity is far less than OMLD. Particle swarm optimization (PSO) aided with radial basis functions (RBF) has been suggested to carry out multiuser detection (MUD) for synchronous direct sequence code division multiple access (DS-CDMA) systems. The MUD problem has been taken as a pattern classification problem and radial basis functions have been used due to their excellent performance for pattern classification. The two variants of PSO have also been used in a joint manner for the task of the channel and data estimation based on the maximum likelihood principle. The PSO algorithm works at two different levels. At the upper level the continuous PSO estimates the channel, while at the lower level, the soft PSO detects the data. The simulation results have proved to be better than that of joint Genetic algorithm and Viterbi algorithm (GAVA) approach.
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حکیم محمد اسمٰعیل

حکیم محمداسماعیل
حکیم محمداسماعیل صاحب کے انتقال کی خبرسے بڑاصدمہ ہوا،مرحوم نے بڑی تکالیف اٹھائیں،اﷲ تعالیٰ مغفرت فرمائے۔ [اکتوبر ۱۹۶۲ء]

 

سیرت نبویﷺ کے منتخب موضوعات (نبوت، وحی اور معجزات) سے متعلق لزلے ہزلٹن کے آراء کا تحقیقی جائزہ

All mighty Allah (SWT) has created man and made him crown of the nature. For the physical needs of human being, Allah provided him all the needful things. In the same way, Allah (SWT) sent his prophets for the spiritual guidance of mankind. Prophet Muhammad (SAW) was the last messenger of this chain of the prophets. The Prophet hood of Muhammad (SAW) was for the whole of the mankind, for all the people till the day of judgment. Because Allah (SWT) called him the “Seal of the prophets”. And it the gift of Allah to whom he wants to give, he gives. Nobody can achieve this (prophet hood) by its struggle. All the prophets of Allah (SWT) were given instructions through revelation. Some people, who were unable to accept Islam, would make jokes of the teachings of the Prophet (SAW), but he continued his mission and the world witnessed a day when Islam spread all over the world. Some non-Muslims, specially the orientalists, tried to pin point some aspects of the life of the Holy Prophets (in their thinking) but as Allah (SWT) said: And we raised high your name. (Al-Quran: 94: 4) Lesley Hazelton is one of those orientalists. She wrote many books about Islam. Her famous book is “The First Muslim-The Story of Muhammad” in which she has targeted many aspects of the Holy Prophet Muhammad (SAW). This article discusses her views about the Prophet hood, Revelation and the Miracles of the Holy Prophet (SAW). It is out of the human mind to understand the reality of the Prophet hood and revelation. It is the gift of Allah to whom he wants, He gives prophet hood. The family, fame, wealth and physical strength cannot be the reasons for the achievement of Prophet hood. The human mind cannot grab the reality of the revelation. 

Synthesis of Novel, Hybrid Polymer Nanocomposite Adsorbent by Graft Polymerization and its Environmental Applications

Two different synthesis approaches were utilized with the ambition for the development of efficient and cost effective adsorbents. These methods were simultaneous radiation grafting and emulsion graft polymerization. Poly(acrylonitrile) grafted sepiolite nanohybrid (MS-g-PANγ) has been synthesized using acrylonitrile via simultaneous radiation grafting. The grafting yield was measured by varying the absorbed dose, dose rate and monomer concentration. The acrylonitrile group was chemically modified into amidoxime (MS-g-aoPANγ). The structural and morphological investigations of these nanohybrids were performed by Fourier transform infrared (FT-IR), x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Batch adsorption studies were carried out for copper uptake onto amidoximated nanohybrid adsorbents to envisage the effects of pH, adsorbent dose, contact time and initial concentration. Equilibrium was attained within 30 minutes following pseudo-second order kinetics and was well described by the Langmuir isotherm model. The maximum adsorption capacity was found to be 278 mg/g for 5 kGy sample. This environmental friendly and cost effective adsorbent can be used for the removal of copper ion. Same technique was exploited for the synthesis of sepiolite-g-polystyrene nanohybrid (MS-g-PSγ) using Co-60 irradiator in the presence of dichloromethane (DCM) under nitrogen atmosphere and room temperature. The grafting yield was affected by absorbed dose and monomer concentration in the mixture. Sulfonation of synthesized nanohybrid (MS-g-sPSγ) was carried out with sulfuric acid. Both the grafting of styrene and its sulfonation were verified by FT-IR, XRD and FESEM. The gravimetric investigations showed that grafting increased with the absorbed dose. Results showed that the system allowed successful grafting of styrene onto modified sepiolite. Sepiolite-g-polyacrylonitrile nanocomposites (MS-g-PAN) were also synthesized using emulsion graft polymerization. The influence of synthesis parameters (concentrations of monomer, initiator and surfactant) on grafting yield was studied. The nitrile group was chemically modified into amidoxime (MS-g-aoPAN). Maximum grafting of 373% was achieved at 5% acrylonitrile, 1% surfactant and 0.1% initiator xvii concentrations. The structural and morphological changes were observed by FT-IR, XRD, FESEM and TEM. Similar technique was applied for the synthesis of sepiolite-g-polystyrene nanocomposites (MS-g-PS) using styrene. Maximum grafting of 85% was achieved at 3% styrene concentration (w/v). FT-IR, XRD and FESEM confirmed the presence of polystyrene grafts but grafting yield was low (85%). So it can be established that radiation grafting is better route for the synthesis of sepiolite-g-polystyrene nanocomposites as compared to emulsion graft polymerization. The intention of this project was to develop organic-inorganic nanohybrid materials having the aptitude to adsorb toxic metals from waste water. The ambition was successfully achieved by adopting two routes of synthesis i.e. radiation grafting and emulsion graft polymerization.