DSpace Collection:http://hdl.handle.net/10266/39022017-09-26T04:24:02Z2017-09-26T04:24:02ZDesign of Circular and Concentric Circular Antenna Array Using an Improved Flower Pollination AlgorithmSingh, DeepikaSingh, Urvinder (Guide)http://hdl.handle.net/10266/48942017-09-25T22:21:04Z2017-09-25T00:00:00ZTitle: Design of Circular and Concentric Circular Antenna Array Using an Improved Flower Pollination Algorithm
Authors: Singh, Deepika; Singh, Urvinder (Guide)
Abstract: Flower pollination algorithm (FPA) is a novel meta-heuristic algorithm inspired from pollination
of flowers. It has been applied to various fields of research and proven its worth. But the algorithm
suffers from certain limitations which confines its scope to different field of applications. In
present work, a modified version of FPA namely an improved flower pollination algorithm (IFPA)
has been proposed to improve exploration, enhance local search and to maintain good balance
between intensification and diversification. Cauchy operator has been added instead of Levy flight
for improving the explorative capability. Secondly, a modified probability switching has been used
to balance exploration and exploitation. The last change considers the effect of current best for
enhancing the local search phase. The results of IFPA are tested on twenty benchmark functions
for different population sizes. The proposed approach is also tested on different dimension sizes
of benchmark problems. The results of IFPA are then compared with differential evolution (DE),
bat algorithm (BA), bat flower pollination algorithm (BFP) and flower pollination algorithm
(FPA). Experimental results show that IFPA algorithm is better when compared to other
algorithms. Further, statistical testing has been done to prove the significance of IFPA.
IFPA is then tested on an important real-world application in the field of antenna design. Two
different antenna synthesis design problem of circular antenna array (CAA) and concentric circular
antenna array (CCAA) has been done using IFPA. Three cases of both arrays are analysed and
then compared with different standard algorithms which shows the superiority of proposed
approach in reducing the side lobe levels and first null beam width.
Description: Master of Engineering -ECE2017-09-25T00:00:00ZImplementation of hebbian - LMS algorithmVartikaSakshi (Guide)http://hdl.handle.net/10266/48922017-09-22T22:21:03Z2017-09-22T00:00:00ZTitle: Implementation of hebbian - LMS algorithm
Authors: Vartika; Sakshi (Guide)
Abstract: In most of the engineered network systems, a set of operations interact with each other in
complex manners that can contain multiple types of relationships, depending on time and
include other types of complexities. Such network systems comprise multiple subsystems and
multiple layers of connectivity, and are generally called as multi-layer networks. There exist
multi-layer neural networks which are feed forward artificial neural network model that maps
sets of input data onto a set of appropriate outputs. it has multiple layers with each layer fully
connected to the next one. An artificial multi layers neural network contains three layers
broadly defined as input layer, hidden layer and output layer in the same order as written.
These network systems can be trained using both supervised and unsupervised algorithms.
The widely used supervised learning in these systems is LMS learning algorithm whereas the
unsupervised learning used is Hebbian learning. A form of LMS algorithm can be established
to achieve unsupervised learning. In this way LMS can be used to implement Hebbian
learning. This implementation of combined algorithms is called as Hebbian-LMS learning
algorithm. Combining the two algorithms creates a new unsupervised learning algorithm that
has application in practical engineering problems.
In this thesis, an artificial neural network is considered, whose hidden layer weights
are adjusted using Hebbian-LMS algorithm and the output layer is trained using the original
supervised LMS algorithm and the results are recorded for various datasets using this
approach as training algorithm in order to determine the feasibility of proposed algorithm in
networks required to solve some practical engineering problems.2017-09-22T00:00:00ZInvestigations on Inter-Satellite Optical Wireless CommunicationKaur, RavneetSingh, Hardeep (Guide)http://hdl.handle.net/10266/48902017-09-21T22:22:21Z2017-09-21T00:00:00ZTitle: Investigations on Inter-Satellite Optical Wireless Communication
Authors: Kaur, Ravneet; Singh, Hardeep (Guide)
Abstract: The lightwave communication systems are capable of transmitting the signals at very high speeds. Distances up to thousands of kilometers are covered using LASERS and LED‟s as light sources. Inter-satellite link (ISL) has great significance for the global coverage with high rate switching and processing abilities. This concept extents lightwave communication technology into the space technology and the Inter-satellite Optical Wireless Communication. Inter-satellite optical wireless communication link exploits the intermixed features of two most powerful communication technologies Wireless and Optics to transmit data between two points using lasers. This technology is useful where fiber optic cable is impractical. Investigations have been carried out of the system for different linearly polarized modes such as LP00, LP01 and LP02 with return-to-zero (RZ), non-return-to-zero (NRZ) and compressed-spectrum-return-to-zero (CSRZ) modulation formats at varied data rates in terms of Q-factor and eye diagram. A comparison of the three modulation formats is formulated. As the performance of IsOWC is extremely affected by system data rate because Q-factor decreases with increase in the data rate. So results are taken at varied data rates of 5-50 Gbps. The projected setup is simulated for three diverse modulation formats RZ, NRZ and CSRZ using LPnm modes with input power of 0 dBm and transmission distance of 1000 km at operating wavelength of 1550 nm. It has been observed that for any LPnm mode Q-factor increases with increase in Tx/Rx aperture diameter. Results demonstrate successful transmission of LP modes through IsOWC link.
Description: Master of Engineering -Wireless Communication2017-09-21T00:00:00ZImplementation of Sequential Decimal MultiplierGupta, SonalShakshi (Guide)http://hdl.handle.net/10266/48832017-09-19T22:20:46Z2017-09-19T00:00:00ZTitle: Implementation of Sequential Decimal Multiplier
Authors: Gupta, Sonal; Shakshi (Guide)
Abstract: Multiplication is the most important operation among all the four arithmetic operations during the last decade in various fields which is in the top list of research. Decimal multiplication is gaining very high popularity in recent years in the fields like analysis of finance, banking, income tax department, insurance and many more such fields. The hardware implementation of this has become a very important and interesting topic of research. There are a number of multipliers such as serial multiplier, parallel decimal multiplier, booth multiplier, Wallace tree multiplier, combinational decimal multiplier, sequential decimal multiplier, array multiplier and sequential multiplier. Each multiplier has its own advantages and disadvantages. Among all these multipliers, the implementation of parallel decimal multiplier is considered to be the hardest because of its high cost of area. The processor industries have implemented a new version of multipliers which is sequential decimal multipliers so as to reduce this high implementation cost. The problem with this sequential decimal multiplier is its high latency. In the reported work, the focus is to generate a sequential decimal multiplier with lowest possible area, delay and power consumption. The BCD-8421 coding mechanism is used to generate easy multiples and partial products.
Description: Master of Technology -VLSI Design2017-09-19T00:00:00Z