Low Complexity Multi User Detection Using Decision Feed Back Equalizer

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: Low Complexity Multi User Detection Using Decision Feed Back Equalizer 

Author Name: Ravindrababu, P. Venumadhav , Krishnarao 

Synopsis: 

This paper implements the transmission and reception of different number of user signals modulated by Binary Phase Shift Keying (BPSK) using CDMA. The transmitting signal goes through the communication channel. It is a medium that is between the transmitter and receiver and is modeled by the impulse response of multi path fading channel and it consists of additive White Gaussian Noise that is AWGN channel. The Decision Feed Back Equalizer (DFE) used to identify different user signals and then demodulates them to get all different user signals. Simulations shows the Decision feedback equalizers (DFE), compared with the Linear equalizers is simulated using MATLAB.

Anfis Controlled Solar Pumping System

Vol.1 No. 3

Year: 2011

Issue: March-May

Title: Anfis Controlled Solar Pumping System 

Author Name: Farhat Mayssa, Sbita Lassaad 

Synopsis: 

This paper deals with a Photovoltaic (PV) controlled pumping system. The topology is a sunshine PV pumping system which consists of a PV generator (PVG), a DC_DC power electronics converter and a DC motor coupled to a positive displacement pump. The proposed PV pumping system works without storage batteries. Water tank can be used as a storage one such as for irrigation use. The proposed system topology consists of a simple electronic design which is suitable for remote areas. The overall proposed algorithm is built around a Neuro-fuzzy Inference System (ANFIS) DC-DC converter controller yielding to a high efficiency solar pumping system. The purpose of this work is to present a new ANFIS-PV which is designed as a combination of the concepts incorporating Sugeno fuzzy model and neural networks. This last uses directly the PVG current and power as the MPPT controller inputs. Matlab Simulation results are selected and presented to highlight improvement for the overall proposed pumping scheme.

Steganalysis of the Image by Visual & Statistical Attacks

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Steganalysis of the Image by Visual & Statistical Attacks 

Author Name: Manisha Sharma, Swagota Bera 

Synopsis: 

Steganography is the technique for hiding secret information in any ordinary image. Such image in which secret information is hidden is known as stego image. Where as Steganalysis is the reverse technique in which detection of the secret information is done in the stego images .In this paper, various visual and statistical attack techniques are implemented for the detection of the secret data in the stego image. There are two ways of doing visual attack: 1. The technique in which detection is done by knowing the cover image without the knowledge of the coding algorithm for the formation of stego image. This technique can be named as visual attack: known cover image. 2. Another technique in which detection is applied to the incoming image without any information known as universal attack .This technique can be named as visual attack: Enhanced LSB technique. With these two techniques the area of hidden data is detected on the basis of the difference in visual texture of the stego image. Similarly two ways of doing statistical attack: 1. The technique in which detection is done by comparing the stego & cover image in which first order statistical analysis is applied without the knowledge of the coding algorithm of the stego image. This technique can be named as histogram analysis. 2. Another technique in which detection is done by the image smoothening technique by using probability distribution function. This technique can be named as statistical attack: image smoothening. With these two technique based on the difference in statistical parameter of the stego image with cover image detection is done. Further the comparison of the techniques of both the attacks is done on the basis of time, memory requirement and information requirement.

Printed Band-Pass Filter At S Band

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Printed Band-Pass Filter At S Band 

Author Name: V. Saravanan 

Synopsis: 

This paper presents a design of miniaturized band pass filters with capacitive coupled resonators applied for realization of a printed filter for a frequency range of 2.4 to 2.5 GHz which lies in the S-band frequency range. A design technique using an approximation polynomial and a filter prototype is proposed. Circuit is simulated using agilent ADS software and its performance is determined. Correspondingly the circuit is fabricated and its output is tested. The main goal of this paper is developing a printed filter of small size at frequencies from 2.4 to 2.5 GHz. The significant size reduction is achieved by the proposed method and it allows smaller filter realization at low microwave frequencies. Other known filter configurations occupy more space for the same specifications. The simulation results are excellent and the filter is suitable for integration within various microwave subsystems.

Colour Image Compression Using Quaternion Principal Component Analysis

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Colour Image Compression Using Quaternion Principal Component Analysis 

Author Name: Venkatramana Reddy B.D, T. Jaya Chandra Prasad 

Synopsis: 

In this paper, we first discuss the quaternion representation of colour images and quaternion matrix algebra. Colour images consisting of the three RGB channels can be represented using pure quaternion-valued pixels. Then, to perform the decomposition of such colour images, we introduce the singular value decomposition of a quaternion matrix which represents a colour image. Finally, based on this decomposition we propose a method for colour image compression without separating the colour image into three channel images. Results of the compression on three different colour images are presented.

Modelling and Simulations of Wireless Mobile Multiple Phase Transmission Protocol Using Tandem Queues With BAS Blockings

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: Modelling and Simulations of Wireless Mobile Multiple Phase Transmission Protocol Using Tandem Queues With BAS Blockings 

Author Name: basudeba behera, Dr. Purna Chandra Mishra, Barsha Pattanaik 

Synopsis: 

In this paper, we have investigated the waiting time/delay of a broad class of mobile communication system-oriented queuing models. Both exact analytic and approximation algorithm techniques are employed in order to obtain the exact and approximate waiting/delay distribution of those models. We concentrate on probability distribution instead of mean value because a one-point estimate is not sufficient to provide a good performance evaluation. We propose different queuing models in order to describe different characteristics of mobile systems. Different server control mechanisms are implemented in order to optimize channel (or server) utilization. Here the tandem queues with BAS blocking policy are investigated.

A Novel Output Vector Monitoring Online Concurrent BIST Architecture For VLSI Circuits

Vol.1 No. 2

Year: 2011

Issue: Dec-Feb

Title: A Novel Output Vector Monitoring Online Concurrent BIST Architecture For VLSI Circuits 

Author Name: Philemon P. Daniel, Rajeevan Chandel 

Synopsis: 

Online concurrent testing of VLSI circuits continues to be a challenge because of the need to test circuits during their normal operation. As offline test techniques and online non-concurrent BISTs cannot be used, new techniques like input vector monitoring concurrent BIST schemes were attempted. But the best of the techniques suffer from major limitations like extremely high concurrent test latency, exponential area overhead, limited fault models and therefore are not a viable solution. In this paper a novel output vector monitoring concurrent BIST scheme is presented. The proposed scheme uses the advantage of an embedded system application and tests only for faults that can occur for the currently loaded application using the run time vectors. This method brings down concurrent test latency to a small fraction, tests for all at-speed fault models, uses a scalable BIST architecture without a noticeable increase in overhead. It eliminates aliasing completely because of double vector compactors. The BIST can also be used for offline concurrent tests which can provide additional coverage to a SBST method. The applicability is validated by implementing the scheme for ALU and decoder in OC8051. To the best of our knowledge the concurrent online BIST using output vector monitoring which works for both online and offline tests is presented for the first time in the open literature.