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    Volume-4 Issue-3

    Title: Adhoc Wireless Networks for maximizing the number of Broadcast Operation

    Authors: T.Manochandar and T.Pandiyavathi

    Abstract: In order to maximize the broadcast operation were consider the static adhoc wireless network where nodes are equipped with the same initial charge which changes their transmission range dynamically. The goal is to provide a range assignment schedule that maximizes the number of broadcast operations from a given source. This maximization problem, denoted by MAX LIFETIME, is known to be NP-hard and the best algorithm yields worst-case approximation ratio ?(log n), where n is the number of nodes of the network. We consider random geometric instances formed by selecting n points independently and uniformly at random from a square of side length ?n in the Euclidean plane. We present an efficient algorithm that constructs a range assignment schedule having length not smaller than 1/12 of the optimum with high probability. Then we design an efficient distributed version of the above algorithm, where nodes initially known. The resulting schedule guarantees the same approximation ratio achieved by the centralized version, thus, obtaining the first distributed algorithm having provably good performance for this problem.

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    Title: FPGA Implementation of Pulse Compression Using LFM and Poly Phase P4 coding in Radar Systems

    Authors: Mrs.Latha.S and Dr. Srividya.P

    Abstract: As the time response for a given filter increases, frequency-domain implementation becomes attractive from a hardware resources point of view. This paper shows the FFT based pulse compression using linear frequency modulation and polyphaser P4 code in radar systems. FPGAs are enhancing radar system performance levels through optimized intellectual property core implementations for critical compute-intensive digital processing algorithms such as pulse compression and Fast Fourier Transform. The focus is on the design of efficient and reconfigurable FPGA implementations of frequency-domain filters. Also the pulse compression is modelled using MATLAB Simulink and Xilinx.

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    Title: Development of an Irregular shaped Microstrip Patch Antenna

    Authors: Monika Kiroriwal

    Abstract: This paper introduces a new geometry of an irregular shaped microstrip patch Antenna using some modifications in the shape like, slot, air gap and truncation, which results in enhancement in axial ratio bandwidth upto 3.47% with little improvement in impedance bandwidth upto 15.68% in comparison with conventional design and there is also improvement in other radiation parameters like gain, efficiency and return loss.

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    Title: Realization and Performance Evaluation of New Hybrid Speech Compression Technique

    Authors: Javaid A. Sheikh and Sakeena Akhtar

    Abstract: A new technique for speech compression using combination of Linear Predictive Coding (LPC) with transform coding has been proposed and evaluated in this paper. The conventional compression technique based on LPC has been replaced with two hybrid models; LPC and Discrete Cosine Transform (DCT), LPC and Discrete Wavelet Transform (DWT). Three different speech signals are compressed by linear prediction, DCT and DWT. We compare the performance of different speech compression techniques on test recorded speech signals. It has been found that hybrid technique of Linear Prediction and Discrete Wavelet Transform outperforms other techniques used in the paper. The proposed scheme has lot of significance in wireless communication in general and mobile communications in particular.

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    Title: Minimization of Degeneracy Problem by Roughening Particle Filter

    Authors: A.Sampath Dakshina Murthy and Dr.A.Naga Jyothi

    Abstract: In tracking ballistic target for radar, the range 2000 is taken up for estimation .Such particle situations arise in many tracking positions for sonar &radar .sampling impoverishment resulting from re-sampling is used to derived predisposition .Degeneracy problem is solved by coupling roughening with particle filter. The state of goal is located by use posterior chance during, Kalman filter are used to comply with the steps of monitory. Approximation of nonlinearities is another technique in the roughening problem. Simulation to guess estimate the objects altitude, velocity & ballistic coefficient can be done for noisy object altitude measurements Kalman recurrence tips for implementation are completely matching with Gaussian patterns. Accuracy of particle filter is improving by the technique adopted in this paper .This is of great use in practical simulations of radar and sonar .Basically, roughening techniques have the capability of improving the results by substantial percentage .Overall ,degeneracy problem is minimized because of roughening of particle filter .

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    Title: A Study on the Linear Algebra & Matrix in Mathematics

    Authors: Manoj Kumar, Arjit Tomar and Gyan Shekhar

    Abstract: In this we are presenting a study on the linear algebra and matrix in mathematics. Linear algebra is the branch of mathematics concerned with the study of vectors, vector spaces (also called linear spaces), linear maps (also called linear transformations), and systems of linear equations. Vector spaces are a central theme in modern mathematics; thus, linear algebra is widely used in both abstract algebra and functional analysis. Linear algebra also has a concrete representation in analytic geometry and it is generalized in operator theory. It has extensive applications in the natural sciences and the social sciences, since nonlinear models can often be approximated by linear ones.

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    Title: Comparative analysis of diversity combining over TWDP fading channel

    Authors: Prabhpreet Kaur and Kiranpreet Kaur

    Abstract: Fading is the crucial statistical characteristic of the fading channel as it degrades the system performance to a larger extent. It is a random process that occurs due to multipath propagation or shadowing. Modelling is the most convenient approach for evaluating fading channel that deals with conceptual and mathematical representation of the system. Of various models available, TWDP is the locus of interest ?being latest and scanty work done in this field. TWDP analysis is based on the expressions such as signal strength which is received at the receiver end and the specular power. For coherent and non- coherent phase modulation techniques, an expression of average Symbol Rate is extracted which is based on probability Distribution function. It results the Probability Density Function of SNR (Signal-To-Noise Ratio). Outage probability and average bit error rate are also compared. Further modification in the wireless system is made by using two different diversity combining techniques wiz SC and MRC. The results are obtained after simulation in MATLAB. It verifies that proposed technique is an efficient one.

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    Title: Comparative Analysis between NRZ and RZ coding of WDM Systems in Optical Wireless Communication

    Authors: Supinder Kaur and Simarpreet Kaur

    Abstract: For the transmission of the signal from the earth station to the satellites and for the satellite to satellite communication the Inter Satellite links are required. The optical Inter Satellite communication (IsOWC) uses the laser source for the data transmission. The Inter satellite optical link were based on the line of sight. Though these systems were reliable, but it was observed that the performance of the system degraded. So there is a need to develop a new system so that the performance of the optical wireless transmission is increased. So in this paper the problem of the traditional system is consider and a new system is proposed. Earlier the system uses the static link and that can be used for single user. WDM the multiplexing is used that will leads the system to work for multiple user rather than the single user. Along with this the different coding format are used, the NRZ and RZ coding format are used and a comparison is done. From the results obtained it is concluded that this proposed system is efficient and better than the existing system.

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    Title: Brain Tumors Frequency Image Mining Used Detection Time Technique in Medical Images

    Authors: Prof P.Senthil

    Abstract: This article establishs a new algorithm which acquires the incline disparity as precise criterion for classification and detection of brain tumors in magnetic resonance images(MRI). This algorithm eradicates the areas of Brain that doesn?t matches the criteria of maximum spatial frequency, intensity since these are the two specified characteristics for finding the tumor part. The basic concepts of image processing are some noise removing functions such as median filter. At last by applying extension of maximal transformation and Regional transformation and by collecting the properties region wise we noticed the most specific part of tumor.This article test the approach in Two image sets: the publicly available BRATS set of glioma patient scans, and multi layer modal brain images of patients with acute and subacute ischemic stroke. We find the generative model that has been designed for tumor lesions to generalize well to stroke images, and the extended discriminative -discriminative model to be one of the top ranking methods in the BRATS evaluation.Experimental results on several medical images containing brain tumor verifies that the proposed Ring algorithm takes seconds on an average to detect the tumor part which is good when compared with existing methods.

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    Title: Simulative Investigation of 64x60Gbps WDM PON Using Dispersion Compensation Technique (FBG)

    Authors: Khushboo Arora and Himali Sarangal

    Abstract: This Research Paper Evaluates the performance of Wavelength Division Multiplexing Passive Optical Network (WDM PON) with 64 Users up to a distance of 101 Km using Dispersion Compensation Technique. Here, Amplifiers are used as a booster and splitters are considered as an PON element to distribute the data signal and makes a link between CO and Users. The architecture of WDM PON is investigated with dispersion compensation technique i.e. Fiber Bragg Grating (FBG) is used to compensate the dispersion as well as to increase the number of Users. Performance is evaluated in terms of Quality Factor and BER.

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    Title: Synthesis of Signed Reversible Multiplier

    Authors: M. Sirisha, M. Kalpana Chowdary and E. Purushottam

    Abstract: A systems performance is generally determined by the speed of the multiplier since multiplier is one of the key hardware components in high performance systems such as FIR filters, digital signal processors and microprocessors etc. Multipliers have large area, long latency and consume considerable power. Hence good multiplier architecture increases the efficiency and performance of a system. Reversible logic has become one of the most promising research areas in the past few decades and has found its applications in several technologies, such as low power CMOS, Nano-computing and optical computing. Reversible logic gates are widely known to be compatible with future computing technologies which virtually dissipate zero heat. Reversible logic gates produce zero power dissipation. So these can be used for low power VLSI design. Hence a signed multiplier using reversible logic gates will play an important role in every vlsi circuit.

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    Title: Determination of convective cloud parameters using WRF and DWR data

    Authors: Puli Anil Kumar and Dr. B. Anuradha

    Abstract: In the present study, the reflectivity values for different locations within the Doppler Weather Radar (DWR) range are extracted on 29th November 2015 from the DWR-MAX (Z) product from the DWR located at Indian Meteorological Department Chennai using MATLAB. The reflectivity values were extracted for Tirupati location using the Weather Research and Forecast (WRF-ARW) model with different microphysics parameterization namely, Kessler Scheme, Lin et al. Scheme, WSM-3 scheme, WSM-5 scheme and Thompson Schemes in combination with cumulus parameterization schemes, namely BMJ (Betts-Miller-Janjic), GD (Grell-Devenyi), G3D (improved Grell-Denenyi) and KF (Kain-Fritsch). Simulations were performed with a nested domain, with a resolution of 18Km, 6Km and 2Km respectively, during the period of 28th to 20th November 2015 with a spin-off of first twelve hours. The reflectivity values extracted from DWR at Tirupati location are compared with the WRF model with a suitable Microphysics and cumulus combination.

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