i-manager's Journal on Communication Engineering and Systems (JCS)


Volume 1 Issue 2 February - April 2012

Research Paper

Analysis Of Atmospheric Radar Echoes Using Fft And Matched Filter For Doppler Profile Detection

PADMAJA* , S. Varadarajan**
* Research Scholar, S.V.U College of Engineering, Tirupati
** Professor of ECE, S.V.U College of Engineering, Tirupati
Padmaja, N. and Varadarajan, S. (2012). Analysis Of Atmospheric Radar Echoes Using FFT And Matched Filter For Doppler Profile Detection. i-manager’s Journal on Communication Engineering and Systems, 1(2), 1-5. https://doi.org/10.26634/jcs.1.2.1769

Abstract

A new algorithm for Doppler profile detection of Radar echoes using Matched Filter is developed in this paper. The algorithm is applied to the time series radar data obtained from the mesosphere- stratosphere- troposphere (MST) region near Gadanki, Tirupati Matched filter is often referred to as optimum filter. The most unique characteristic of the matched filter is that it produces the maximum achievable instantaneous SNR at its output when a signal plus additive white noise is present at the input.  This presents a new technique adopted when information regarding all the range bins is available and the processing load can be handled. The results are compared with the traditional FFT technique and are presented for the performance evaluation. The merits and limitations of this method of detecting dopplers in comparison to FFT are discussed.

Research Paper

ROI Segmentation On DICOM Image In Presence Of Noise Based On Morphology

T. Surendra Nath* , V. Kalpana**, Vijaya Kishore***
* PG Student, Communication Systems, SITAMS, Chittoor
** PG Student, Communication Systems, SITAMS, Chittoor
*** Professor, Department of ECE, SITAMS, Chittoor
Nath, T. S., Kalpana, V., and Kishore, V. V. (2012). ROI Segmentation On DICOM Image In Presence Of Noise Based On Morphology. i-manager’s Journal on Communication Engineering and Systems, 1(2), 6-11. https://doi.org/10.26634/jcs.1.2.1770

Abstract

Various medical imaging available are MRI, CT, US and DICOM. Automated Computer Aided Diagnosing (CAD) system detects lung cancer with improved diagnostic radiology. Several approaches to lung CAD combine geometric and intensity models to enhance local anatomical structure. Two difficulties those are primarily associated with the detection of nodules include the detection of nodules that are adjacent to vessels or the chest wall when they have very similar intensity; and the detection of nodules that are non-spherical in shape. In such cases, intensity thresholding or model based methods might fail to identify those nodules. In this paper Region of interest segmentation of DICOM lung image is performed in the noisy environment such as Poisson and speckle using morphology and watershed algorithm. The ROI lung area blood vessels and nodules from the major lung portion are extracted achieved using different edge detection operators such as Sobel, Prewitt and LoG in presence of noise.  The results are helpful to study and analyse the influence of noises on the DICOM images in extracting region of interest.

Research Paper

Curvelets with New Quantizer for Image Compression

G. Jagadeeswar Reddy* , T. Jaya Chandra Prasad**, M. N. Giri Prasad***, M. Madhavi Latha****, T. Satya Savithri*****
ECE Department, EVMCET, AP, India
ECE Department, RGMCET, Kurnool, AP, India.
ECE Department, JNTUCE, Pulivendula, AP, India.
ECE Department, JNTUH, Hyderabad, A.P, India.
ECE Department, JNTUH, Hyderabad, A.P, India.
Reddy, G. J., Jayachandraprasad, T., Giriprasad, M. N., Latha, M. M., and Savithri, T. S. (2012). Curvelets With New Quantizer For Image Compression. i-manager’s Journal on Communication Engineering and Systems, 1(2), 12-16. https://doi.org/10.26634/jcs.1.2.1771

Abstract

This paper emphasizes on designing of a novice quantizer that is more suitable for compressing images through new transform known as curvelet transform. The new transform is believed to capture image information more efficiently than the wavelet transform by providing basis elements in addition to possessing the qualities of wavelet. It was designed to represent edges and other singularities along curves much more efficiently than traditional transforms, i.e. using many fewer coefficients for a given accuracy of reconstruction. This compression algorithm is tested on various images like plain, textured and building images. The results are compared with the existing techniques like curvelet with existing quatizer, wavelet with existing quantizer and wavelet with proposed quantzer. The proposed algorithm “curvelets with proposed quantizer” outperforms the existing techniques. The performance is evaluated through visual clarity, Peak Signal to Noise Ratio (PSNR) and compression metrics such as Compression ratio and Bit-rate.

Research Paper

Performance Analysis Of CDMA System Using Power Control Algorithm With AWGN Channel

G. Brindha*
Assistant Professor, Lord Jegannath College of Engineering and Technology
G. Brindha (2012). Performance Analysis Of Cdma System Using Power Control Algorithm With Awgn Channel. i-manager’s Journal on Communication Engineering and Systems, 1(2), 17-22. https://doi.org/10.26634/jcs.1.2.1772

Abstract

Continuation of an active call is one of the most important quality measures in cellular communication systems. Handoff process in the cellular system  enables  to provide such  facility by transferring an active call from one cell to another cell.Signals transmitted over a multipath propagation channel can exhibits inter path interference and fading. To overcome the multipath effect, Rake receiver is used in CDMA technology. An important characteristic of a multipath channel is the time delay spread it causes to the received signal. This delay spread equals the time delay between the arrival of the first received signal component (LOS or multipath) and the last received signal component associated with a single transmitted pulse. Another characteristic of the multipath channel is its time-varying nature.Rake receiver is realized between the main path component and the local recovery carrier. In this paper the downlink performance parameters are estimated for a CDMA mobile system at the vertex of multiple adjacent cells. At the base station the received signal is coherently dispread and demodulated using a rake receiver. The effects of power control, error correction and rake receiver were also investigated and simulated based on the assumption that the received signals undergo Rayleigh fading.

Research Paper

Analysis of Planar Tapered Dielectric Optical Waveguides using Matrix Approach without Considering the Reflection of the Fields at the Taper Boundary

S. K. Raghuwanshi*
Department of Electronics Engineering
Indian School of Mines Dhanbad, India.
Raghuwanshi, S. K., and Kumar, S. (2012). Analysis of Planar Tapered Dielectric Optical Waveguides Using Matrix Approach Without Considering The Reflection Of The Fields At The Taper Boundary. i-manager’s Journal on Communication Engineering and Systems, 1(2), 23-26. https://doi.org/10.26634/jcs.1.2.1773

Abstract

Optical waveguides are the building blocks of photonics circuits. They are used as, couplers, switches, splitters, multiplexer and de-multiplexer for optical signals. During the last two decades extensive study on analytical/numerical method in the field of optical waveguide has been done by different researchers. In this paper the matrix method has been applied to analyze taper waveguide (or bend waveguide) while considering the normal incidence of light and assumed to be no reflection from the first medium, where the light is being launched. The waveguide is assumed to be taper (bend). This type of waveguide structure is used in WDM optical communication system as a power splitter device.

Research Paper

Comparative Study of Different Medical Images with Noise Based On Morphology

V. Kalpana* , T. Surendra Nath**, Vijaya Kishore***
* PG Student, Communication Systems, SITAMS, Chittoor.
** PG Student, Communication Systems, SITAMS, Chittoor.
*** Professor, Department of ECE, SITAMS, Chittoor.
Kalpana, V., Nath, T. S., and Kishore, V. V. (2012). Comparative Study Of Different Medical Images With Noise Based On Morphology. i-manager’s Journal on Communication Engineering and Systems, 1(2), 27-35. https://doi.org/10.26634/jcs.1.2.1774

Abstract

Medical images are diagnosed and demonstrated with their regional structures. Edge detection is a fundamental element in the field of image processing and computer vision for the extraction of features. Edge detection identifies and captures sharp intensity changes in an image. Medical image edge detection focus on object recognition of human organs. To detect the severity of disease several medical approaches like CT, MRI, PET, US and DICOM can be used. In this paper performance of CT and DICOM images using morphology and edge detection algorithms are evaluated in noisy environment. A comparision of different edge detecting algorithms by using several noises is performed and evaluated based on correlation coefficient and PSNR. The outcomes evaluate the resistivity of operators in presence of noise.

Review Paper

Evolutionary Approach of Adiabatic Logic Design on Low Power Solution –A Robust Survey

A. Kishore Kumar* , D. Somasundareswari**, V.Duraisamy*******
* Dean, Electrical Sciences, Adithya Institute of Technology, Coimbatore, India.
*** Professor & Principal, Hindustan College of Engineering & Technology, Coimbatore, India.
**** Assistant Professor, ECE Department, Coimbatore Institute of Technology, Coimbatore, India.
Kumar, A. K., Somasundareswari, D., Duraisamy, V. and Pradeepa, T. S. (2012). Evolutionary Approach Of Adiabatic Logic Design On Low Power Solution - A Robust Survey. i-manager’s Journal on Communication Engineering and Systems, 1(2), 36-49. https://doi.org/10.26634/jcs.1.2.1775

Abstract

Adiabatic Logic styles in low power VLSI design have been examined for many years to achieve predictable low power design success.  In this paper, we present a comprehensive literature review pertaining to the state-of-the-art issues in adiabatic logic designs and also focus on primary developments in this field that have taken place in the low power design. Various research papers and application notes have been referred to, for clear understanding of adiabatic logic designs on low power solutions. Major focus of this paper is to identify the gaps of the adiabatic logic designs and to narrow down the problems and requirements for its practical usage in semiconductor industries. Enough designs and methods have been proposed over last few decades, but the implementation of this logic, triggers the designer in various open points, which restricts further stems. This paper highlights the major open points and gives the solution for further design requirement to implement the adiabatic logic in semiconductor industries.