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Search Results: 1 - 10 of 401999 matches for " M. Geetha Priya "
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Frequency Synchronization in OFDM System  [PDF]
C. Geetha Priya, A. M. Vasumathi
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B024

An accurate frequency synchronization method using the zadoff-chu (ZC) constant envelop preamble is analyzed, and a new preamble weighted by pseudo-noise sequence is used for orthogonal frequency division multiplexing (OFDM) systems. Using this method, frequency offset estimator range is greatly enlarged with no loss in accuracy. The range of the frequency estimation is ±30 of subcarrier spacing using ZC sequence as preamble. Simulations in the MATLAB for an AWGN channel show that the proposed method achieves superior performance to existing techniques in terms of frequency accuracy and range.

International Journal of Engineering Science and Technology , 2011,
Abstract: Under ideal conditions, Reversible logic gates produce zero power dissipation. So these can be used for low power VLSI design. This paper proposes a new reversible parallel adder/subtractor using 4*4 Reversible DKG gate that can work singly as a reversible full adder and a full subtractor. A serial adder/subtractor is also designed in this paper using Reversible Universal Shift registers and DKG gate.This paper provides a threshold to build more complex arithmetic systems using reversible logic.
Power Management During Scan Based Sequential Circuit Testing
Reshma.P,M.Geetha Priya
Advanced Computing : an International Journal , 2011,
Abstract: This paper shows that not every scan cell contributes equally to the power consumption during scanbased test. The transitions at some scan cells cause more toggles at the internal signal lines of a circuitthan the transitions at other scan cells. Hence the transitions at these scan cells have a larger impact onthe power consumption during test application. These scan cells are called power sensitive scan cells.Averilog based approach is proposed to identify a set of power sensitive scan cells. Additional hardware isadded to freeze the outputs of power sensitive scan cells during scan shifting in order to reduce the shiftpower consumption.when multiple scan chain is incorporated along with freezing the power sensitivescan cell,over all power during testing can be reduced to a larger extend.
A New Leakage Power Reduction Technique for CMOS VLSI Circuits
M. Geetha Priya,K. Baskaran,D. Krishnaveni,S. Srinivasan
Journal of Artificial Intelligence , 2012,
Abstract: A robust method which is equally effectual for static power control in CMOS VLSI circuits for System on Chip (Soc) applications in deep submicron technologies is proposed. Referring to the International Technology Roadmap for Semiconductors (ITRS), the total power dissipation may be significantly contributed by leakage power dissipation. To reduce leakage the proposed method introduces two self controlled stacked leakage control transistors (LT) between Vdd and ground, which offers high resistance, when it is in off state. The gate and substrate of each LT’s are tied together to introduce Dynamic Threshold voltage MOSFET (DTMOS). This proposed method is intuitively momentous and leads to better performance measure in terms of dynamic power, leakage power propagation delay and Power Delay Product (PDP) with standard threshold devices. The experiment and simulation results show that the proposed method effectively outperforms than the base case with little area overhead.
Design and Optimization of Log Periodic Toothed Antenna for UWB Applications
L. Franklin T elfer,T. R. Geetha Ramani,P. Catherine Beaula,M. S. Divya Priya
International Journal of Engineering Innovations and Research , 2013,
Abstract: The aim of this paper is to design and optimize the performance of log periodic toothed antenna for Ultra Wideband (UWB) Applications. The operating frequency of the antenna is 4-10GHz. The proposed method focuses to optimize the performance of the antenna by achieving the gain of 4.5dB, VSWR This antenna is simulated using ANSOFT-HFSS and the results are presented.
A Novel Approach of Energy Optimization in WSN
S. Geetha Priya,A.R. Arunachalam
International Journal of Computer Science and Mobile Computing , 2013,
Abstract: The wireless link can be unreliable in realistic wireless sensor networks (WSNs). Energy efficientand reliable data forwarding is important because each node has limited resources. Therefore, we mustsuggest an optimal solution that considers using the information of the node’s characteristic A wirelesssensor network is composed of a large number of low-cost devices distributed over a geographic area. Sensornodes have limited processing capabilities therefore simplified protocol architecture should be designed so asto make communications simple and efficient. Moreover, the power supply unit is based on an energy-limitedbattery the networks should be aimed at minimizing the energy consumption. A forwarding scheme for WSNaimed at combining low computational complexity and high performance in terms of energy efficiency andreliability. The approach relies on a packet-splitting algorithm based on the BURST algorithm. Theperformance of burst is to be obtained by Shortest Path with Load Balancing (SP).The energy efficiency islow in this splitting process compare to those shortest paths. To estimation of the mean energy reductionfactor achievable with the forwarding scheme should be derived and the reassembling is done in destinationside, the values to be coded in code block and simulated using MATLAB simulator. The proposed algorithmoutperforms in terms of energy saving and increases the network lifetime.
Mitotic index in down syndrome - Is it an indicator of immunological status
Ranganath Priya,Suresh Geetha,Subramaniam Amudha,Rajangam Sayee
Indian Journal of Human Genetics , 2004,
Abstract: Down syndrome (DS) is a condition in which the genes on chromosome 21 occur in three copies. This is supposed to influence the growth in the tissues of the body and this could lead to a decreased mitotic index. In view of this, the present investigation was carried out using peripheral lymphocyte culture to find out whether there is a change in mitotic index in DS patients. Mitotic index in male and female patients was reduced to an average of 3.64 and 3.82 respectively. Thus, the index could be an indicator of the reduced immunological status of the individual with DS.
Identification of a differentially expressed thymidine kinase gene related to tapping panel dryness syndrome in the rubber tree (Hevea brasiliensis Muell. Arg.) by random amplified polymorphic DNA screening
Perumal Venkatachalam,Natesan Geetha,Padmanabhan Priya,Arjunan Thulaseedharan
International Journal of Plant Biology , 2010, DOI: 10.4081/pb.2010.e7
Abstract: Tapping panel dryness (TPD) syndrome is one of the latex yield affecting factors in the rubber tree (Hevea brasiliensis Mull. Arg.). Therefore, identification of a DNA marker will be highly useful for screening progenies in breeding programs. The major goal of this study was to detect genetic variations and/or identification of gene fragments among 37 Hevea clones by the random amplified polymorphic DNA “fingerprinting” technique. Different levels of DNA polymorphism were detected with various primers and a distinct polymorphic band (2.0 kb) was obtained with OPA-17 primer. It was cloned into a plasmid vector for further sequence characterization and the nucleotide sequence shows homology with a novel putative plant thymidine kinase (TK) gene, designated as HbTK (Hevea brasiliensis thymidine kinase; GenBank accession number AY130829). The protein HbTK has 67%, 65%, 64%, and 63% similarity to TK genes of Medicago, Oryza, Arabidopsis, and Lyco- persicon, respectively, and it was highly conserved in all species analyzed. The predicted amino acid sequence contained conserved domains of TK proteins in the C-terminal half. Southern blot analysis indicated that HbTK is one of the members of a small gene family. Northern blot results revealed that the expression of the HbTK gene was up-regulated in mature bark tissues of the healthy tree while it was down-regulated in the TPD-affected one. These results suggest that this gene may play important roles in maintaining active nucleotide metabolism during cell division at the tapped site of bark tissues in the healthy tree under stress (tapping) conditions for normal latex biosynthesis.
A Novel Cosine Approximation for High-Speed Evaluation of DCT
Geetha Komandur, M. UttaraKumari
International Journal of Image Processing , 2011,
Abstract: This article presents a novel cosine approximation for high-speed evaluation ofDCT (Discrete Cosine Transform) using Ramanujan Ordered Numbers. Theproposed method uses the Ramanujan ordered number to convert the angles ofthe cosine function to integers. Evaluation of these angles is by using a 4thdegree polynomial that approximates the cosine function with error ofapproximation in the order of 10-3. The evaluation of the cosine function isexplained through the computation of the DCT coefficients. High-speedevaluation at the algorithmic level is measured in terms of the computationalcomplexity of the algorithm. The proposed algorithm of cosine approximationincreases the overhead on the number of adders by 13.6%. This algorithmavoids floating-point multipliers and requires N/2log2N shifts and (3N/2 log2 N)- N+ 1 addition operations to evaluate an N-point DCT coefficients therebyimproving the speed of computation of the coefficients
A study on relevance of demographic factors in investment decisions
N. Geetha,M. Ramesh
Perspectives of Innovations, Economics and Business , 2012,
Abstract: This study attempts to find out the significance of demographic factors of population such as gender, age, education, occupation, income, savings and family size over several elements of investment decisions like priorities based on characteristics of investments, period of investment, reach of information source, frequency of investment and analytical abilities. The study was made by conducting a survey in Nagapattinam district of Tamilnadu, South India and the statistical inferences were deduced using computer software tools. The study reveals that the demographic factors have a significant influence over some of the investment decision elements and insignificant in others elements too. The study also discloses a general view of investors perception over various investment avenues.
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