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Anupama K.S.S.,VR Siddhartha Engineering College | Gowri S.S.,SRK Institute of Technology | Rao B.P.,Jawaharlal Nehru Technological University Kakinada | Murali T.S.,VR Siddhartha Engineering College
Advances in Intelligent Systems and Computing | Year: 2014

The next generation wireless systems will consist of heterogeneous networks from cellular, Wi-Fi, WiMAX to other emerging access technologies. Vertical handoff occurs when a mobile terminal decides to switch between networks. One of the challenging problems during vertical handoff is the selection of an optimal network that maximizes end users satisfaction. This paper presents an intelligent vertical handoff decision algorithm that selects the target network based on the traffic class of the mobile user. The algorithm uses two modules, to estimate the handoff requirement and to select the optimal network. These modules utilize Fuzzy Logic and Genetic algorithm to make an intelligent vertical handoff decision.


Babu Ch.R.,SRK Institute of Technology | Rao B.P.,JNTUK
Procedia Computer Science | Year: 2015

Human beings can easily categorize a person's age group from a facial image where as this ability has not been promising in the computer vision community. To address this problem very important area of research, the present paper proposes a novel scheme of age classification system using features derived from co-occurrence parameters using Rank based Edge Texture Unit (RETU). The Co-occurrence Matrix (CM) on RETU characterizes the relationship between the neighbouring edge values, while preserving local information. The novelty of the proposed RETU is it classifies the age of human into seven categories i.e. in the age groups of 1-10, 11-20, 21-30, 31-40, 41-50, 51-60, and greater than 60. The TU of the proposed RETU ranges from 0 to 17 and thus reduces overall complexity in evaluating features from CM. The co occurrence features extracted from the RETU provide complete facial image information for age classification purpose. The RETU reduces each 3×3 sub image into 2×2 sub image while preserving the texture features and thus reduces the overall dimensionality of the image. © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.


Anupama K.S.S.,VR Siddhartha Engineering College | Gowri S.S.,SRK Institute of Technology | Rao B.P.,JNTUK | Murali T.S.,Tata Consultancy Services Ltd.
Proceedings of the 2014 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2014 | Year: 2014

In a heterogeneous wireless network environment always best connected concept requires the selection of an optimal access network. Selection of a non-optimal network can result in undesirable effects such as higher costs and poor service experience. In this paper an attempt is made to find a solution for network selection by using two multiple attribute decision making (MADM) methods namely Preference Ranking Organization Method for Enrichment Evaluations (PROMETHEE ) and Analytic Hierarchy Process (AHP). The AHP method is used to determine weights of the criteria and the PROMETHEE method is used to rank the networks. Four traffic classes namely conversational, streaming, and interactive and background are included to illustrate the method. The performance of PROMETHEE is validated by comparing with AHP in terms of consistency, ranking abnormality, robustness and accuracy. Simulation results show that PROMETHEE is slightly preferable to AHP in network selection. © 2014 IEEE.


Satyanarayana Murthy N.,VR Siddhartha Engineering College | Sri Gowri S.,SRK Institute of Technology | Prabhkara Rao B.,Jntuk
International Journal of Applied Engineering Research | Year: 2014

For using in multiple transmits antennas systems, a number of Quasi- Orthogonal Space-Time Block Codes (QOSTBC) has been proposed. Based on circulant matrix, in this paper, we propose a novel method of extending any QOSTBC constructed for 8 transmit antennas to a closed-loop scheme. We prove that the proposed scheme can improve its transmit diversity with one bit feedback, with the aid of multiplying the entries of QOSTBC code words by the appropriate phase factors which depend on the channel information. The optimal constellation rotated schemes as well as performances of the proposed scenario 8 transmit antennas QOSTBC are analyzed. The simulation results suggest that there is a significant Eb/No advantage in the proposed scheme which is able to be designed easily. © Research India Publications.


Nimmagadda S.M.,Vr Siddhartha Engg College | Sajja S.G.,SRK Institute of Technology | Bhima P.R.,JNTUK
International Conference on Communication and Signal Processing, ICCSP 2014 - Proceedings | Year: 2014

For using in multiple transmits antennas systems, a number of Quasi-Orthogonal Space-Time Block Codes (QOSTBC) has been proposed. Based on circulant matrix, in this paper, we propose a novel method of extending any QOSTBC constructed for 8 transmit antennas to a closed-loop scheme. We prove that the proposed scheme can improve its transmit diversity with one bit feedback, with the aid of multiplying the entries of QOSTBC code words by the appropriate phase factors which depend on the channel information. The optimal constellation rotated schemes as well as performances of the proposed scenario 8 transmit antennas QOSTBC are analyzed. The simulation results suggest that there is a significant Eb/No advantage in the proposed scheme which is able to be designed easily. © 2014 IEEE.


Murthy N.S.,Vr Siddhartha Engg College | Srigowri S.,SRK Institute of Technology
2012 International Conference on Devices, Circuits and Systems, ICDCS 2012 | Year: 2012

Space -time block codes from orthogonal design have two advantages, namely, fast maximum - likelihood (ML) decoding and full diversity. Rate 1 real space -time codes (real orthogonal design) for multiple transmit antennas have been constructed from the real Hurwitz - Radon families, which also provides the rate 1/2 complex space -time codes(complex orthogonal designs) for any number of transmit antennas. Rate 3/4 complex orthogonal designs (space - time codes) for three and four transmit antennas have existed in the literature but no high rate (>1/2) complex orthogonal designs for other numbers of transmit antennas exist. In this correspondence, we present rates 3/7, 4/8 and rate 6/8 generalized complex orthogonal designs for three, four and four transmit antennas, respectively. © 2012 IEEE.


Murthy N.S.,VR Siddhartha Engineering College | Sri Gowri S.,SRK Institute of Technology
Procedia Engineering | Year: 2012

The need for mobile communication systems with high data rates and improved link quality for a variety of application has dramatically increased in recent years. Multiple antenna systems are an efficient means for increasing the performance. To utilize the huge potential of multiple antennas it is necessary to choose transmit strategies, referred to as space-time block code (STBC). For real orthogonal STBC design the code rate 1 can be achieved, for any number of transmit antenna. For complex orthogonal STBCs of two, three, and four transmit antennas have achieved rate of 1, 3/4 and 3/4 respectively. Complex orthogonal designs STBCs for other numbers of transmits antennas exhibit rates of 1, 7/11 and 3/5 for four, five and six antennas respectively. In this paper we achieved full rate, generalized complex orthogonal space time block code for 8 transmit antenna. © 2011 Published by Elsevier Ltd.


Vemulakonda R.,Mother Teresa Institute of Science and Technology | Kapalavayi R.Y.,SRK Institute of Technology
Communications in Computer and Information Science | Year: 2012

To make banking more comfortable, Banks make the Interbank Networks, by that the usage of ATMs of the non native users also increases. Interbank Network provides so many services, in them the effective one is usage of non native ATM service up to certain times without paying the surcharge, which is better service and not fulfilling due to missing of some elementary representation. This paper informs the problem along with the solution, which is in the form of Transaction counter. © 2012 Springer-Verlag.


Rao K.M.,Andhra University | Subbarao G.V.R.,SRK Institute of Technology
Natural Hazards | Year: 2012

Numerous studies demonstrated the possibility of utilizing fly ash in the construction of embankments, road subgrades and stabilization of a wide range of soils. The present investigation aims at determining the optimum fly ash (OFA) for mechanical stabilization of expansive soils. Four different soils were tested for compaction characteristics and unconfined compressive strength with and without the addition of fly ash to determine the OFA. The liquid limit (LL) and the fraction coarser than 425 μ (CF) of these soils range from 50 to 120 and 25 to 70%, respectively. An experimental strategy called two-factor factorial design was adopted in the conducting experiments. LL and CF present in the soil are the two factors considered to influence the OFA content. Factorial experimentation enables relative quantification of the effect of each factor as well as their interaction with the OFA. The OFA was found to range from 5 to 40% depending upon the two factors. The LL and the CF were found to have dominating influence on OFA content in that order, whereas the interaction effect of these two factors was marginal to fair. A statistical regression model was developed for determination of the OFA in terms of the influencing factors. The validity of the model developed was verified by conducting laboratory tests on two more soils that were not used in the development of the model. Swell potential and swelling pressure of expansive soils were reduced to non-critical levels when treated with OFA. © 2011 Springer Science+Business Media B.V.


Murthy N.S.,Vr Siddhartha Engg College | Sri Gowri S.,SRK Institute of Technology | Saileela J.N.V.,Vr Siddhartha Engg College
Communications in Computer and Information Science | Year: 2011

The increasing demand for higher data rates and higher quality in wireless communications has motivated the use of multiple antenna elements at the transmitter and single antenna at the receiver in a wireless link. Space-time block coding over Rayleigh fading channels using multiple transmit antennas was introduced. In this work Data is encoded using a space-time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbed by noise. Maximum likelihood decoding is carried out by dividing the signals transmitted from different antennas. This uses the orthogonal structure of the space-time block code and gives a maximum-likelihood decoding algorithm, which is based only on linear processing at the receiver. Space-time block codes are designed to achieve the maximum diversity order for a given number of transmit and receive antennas subject to the constrain of having a simple decoding algorithm. This paper presents a simple two-branch transmit diversity scheme. Using two transmit antennas and one receive antenna using QAM modulation technique the performance of OSTBC with Alamouti is compared with no STBC scheme at lower as well as higher SNRs. This paper evaluates the performance of the system by increasing data lengths in terms of blocks. © 2011 Springer-Verlag.

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