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Acapulco de Juárez, Mexico

Karpagam M.,SKCET | Nagarajan N.,CIET
Journal of Theoretical and Applied Information Technology | Year: 2014

In this paper, we propose a novel bandwidth allocation scheme that will guarantee quality-of-service (QoS) support in the downlink (DL) of a LTE-A system. The proposed scheme is developed based on a queuing model that links important performance metrics of DL service flows of LTE-A systems to a set of tunable parameters. Based on the outcome of the results of the queuing model, the performance metrics are set. The bandwidth allocation scheme then uses the pre-determined performance parameters in making the scheduling decisions. In order to achieve the best results from the proposed scheme, the scheme is integrated with the slot allocation process that is carried out in the physical layer. LTE-A systems uses orthogonal frequency-division multiple access (OFDMA) slot allocation mechanism that adapts to channel conditions at the destination mobile stations (MSs). The proposed scheme performs better than the conventional approach in terms of system throughput, delay and packet dropping ratio, thereby, improving the QoS of the overall system. Further the proposed system is simple in design and its cross-layer approach guarantees improved resource utilization especially in the presence of link adaptations and channel fading. Simulation results have demonstrated that the proposed scheme provides better QoS support for both real-time and non-real-time applications in LTE-A systems. © 2005 - 2014 JATIT & LLS. All rights reserved.

Karpagam M.,SKCET | Nagarajan N.,CIET | Abiramiathavi J.,SKCET
Journal of Theoretical and Applied Information Technology | Year: 2014

This paper proposes an enhanced error node regaining algorithm to prolong the lifespan of a wireless sensor network when some of the sensor nodes power down. This algorithm is mainly based on the genetic algorithm. The efficiency of the energy can be enhanced by the sparse or compressive sensing feature. Our results show that compact sensing prolongs the network lifespan and is more useful for wireless sensor networks with a smaller coverage area. © 2005 - 2014 JATIT & LLS. All rights reserved.

Rajakumar C.,CIET | Shankar Kumar K.R.,REC
Journal of Theoretical and Applied Information Technology | Year: 2014

PCA and FLDA are mainly used in face recognition and feature extraction. PCA uses eigen vector and FLDA uses within class scatter matrix and between class scatter matrix. When within class matrix becomes singular, it cannot be evaluated. A new method called semi-discrete decomposition is used in single image per person problems. The performance of this method is tested on 4-data bases, namely ORL, UMIST, Poly u-NIR, YALE. The proposed method performs better than SVD based approach and QRCP based approach in terms of recognition rate with training times in two times higher than QRCP. © 2005 - 2014 JATIT & LLS. All rights reserved.

Ramkumar Raja M.,CIET | Arul Jothi S.,SREC
Journal of Theoretical and Applied Information Technology | Year: 2014

This RC4 is the most popular stream cipher in the domain of cryptology. In this paper, we present a systematic study of the hardware implementation of RC4, and propose the fastest known architecture for the cipher. We combine the ideas of hardware pipeline and loop unrolling to design an architecture that produces two RC4 key stream bytes per clock cycle. We have optimized and implemented our proposed design using Verilog description, synthesized with 45nm technology. The proposed design has a total area of 138459um2 and shows a power consumption of 382.0935mW.The proposed circuit has a higher operating frequency of 1.387GHz compared to 1.22GHz which is 8.37% higher than the conventional RC4 circuit. The throughput of the proposed RC4 circuit is found to be 22.192Gbps. © 2005 - 2014 JATIT & LLS. All rights reserved.

Angadi S.H.,Anna University | Mohan S.,CIET
Research Journal of Applied Sciences, Engineering and Technology | Year: 2015

In the direction of performance analysis form based web application development is reckoned in our work. User interface development part of web application development is further taken into consideration. Navigation aspect is emphasasised; to model navigation class diagram in Unified Modeling Language (UML) to Conceptual Data Model (CDM) mapping is carried through. For achieving transformation, in this study design document is parsed then CDM graph is drawn from parsed design data. Directed CDM graph generation using either critical use case or algorithm is conversed. © Maxwell Scientific Organization, 2015.

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