A RELIABLE AND ROBUST IMAGE TRANSMISSION OVER WIRELESS NETWORKS

abstract

Reliable data transmission in wireless mobile networks is one of the most significant features in order to guarantee efficient delivery of information. Cryptographic algorithms ensure secure communications across wireless networks and channel coding helps in reliable communication.

In this project we proposed a new approach which guarantees a highly reliable and secured information data transfer using modified AES algorithm along with error control coding techniques.

              Further we have included the source encoding for achieving bandwidth reduction which improves BER performance of the system. The error control coding has been realized using turbo encoding with random interleaver. The proposed hybrid system is found to be more robust and reliable in noisy and fading channels. The BER performance of the proposed system is analyzed with AES scrambler and channel encoder for better BER performance.

for details contact :-saikrishna504@gmail.com

MODELING OF PHOTOVOLTAIC-DISTRIBUTED GENERATION SYSTEM

abstract

With a global energy situation characterized by an ever-increasing demand, distributed generation becomes a solution that raises a lot of hopes. Many countries that lack the generation facilities to meet their demand consider distributed generation as a means to support their electric distribution systems. These distributed sources are indeed used to provide the needed power to local loads.

            Photovoltaic(PV) technology is offering one of the best DG power production options because of simplicity of allocation, high dependability, absence of fuel cost, low maintenance etc. Today the grid integration of PV systems is gaining interest over traditional stand-alone systems. This condition impose the necessity of having a good model to accurately predict the dynamic performance of PV systems under different operating conditions in order to make a sound decision on whether or not to incorporate this technology into the electric grid.

            The objective of our project is to design and develop a dynamic model of a PV energy conversion system used as a distributed generator. All the components involved are modeled separately using mathematical equations, taking into consideration the effect of environmental conditions. The models are simulated in the MATLAB/SIMULINK environment. The simulation models are then tested for different critical operating conditions.

for details contact :-saikrishna504@gmail.com

Implementation of Advanced Encryption Standard (AES) algorithm for secured wireless transmission of data using RFID

abstract

The intention of the project is to develop an embedded system for secured transmission of data. Data is retrieved from an RFID tag using RFID reader. The data is acquired as per the requirement from the sensor and sent to the microcontroller system. Microcontroller controls the data acquisition as per the requirements of the user. Then the data is processed in an embedded system and sent to the PC for encryption using one of the advanced standard algorithms. 

Encryption is the process of converting a plaintext message into cipher text which can be decoded back into the original message. An encryption algorithm along with a key is used in the encryption and decryption of data. There are several types of data encryptions which form the basis of network security. Encryption schemes are based on block or stream ciphers. The type and length of the keys utilized depend upon the encryption algorithm and the amount of security needed.

The encrypted data is sent to the server through an RF modem as the transmitter. At the receiver end, for servers, a microcontroller based decryption circuit is employed. The data can be processed and analyzed as per the requirements. For the security and attendance systems, can be preceded for further action.

 for any details please contact:- saikrishna504@gmail.com

robot control system

abstract

Modern electronic devices and gadgets require a constant, unfluctuating power supply as per their design and manufacturing. This task is accomplished by Switched Mode Power Supply, in short, SMPS. It provides a constant dc output for the working of the device. Generally, in SMPS, a flyback converter topology is used. There are some disadvantages with this flyback topology like high RMS and peak currents in the design, high flux excursions in the inductor, low efficiency, high cost, complicated control of the converter, lower bandwidth due to a zero in the response of the converter, the current feedback loop used in current mode control needs slope compensation in cases where the duty cycle is above 50% etc. Due to this, we go for forward topology in SMPS. In the forward converter, the power switch is turned on and off quickly at the given frequency because the transformer cannot operate on dc. So the pulses have to be generated by the driver IC like SG 3524 and its output is used to drive the switch. The switch output (pulsating dc) is connected to transformer. So, the input is transferred to the secondary side of the transformer.  In the secondary side, the rectifying and free wheeling actions take place and the ripple in the output is eliminated by the use of a large capacitance. The continuity in the circuit is maintained by the inductor so that a constant current is carried to the load from the rectifying and free wheeling actions. The load is resistive in nature and constant dc output is obtained. By varying the on- time and the duty cycle using potentiometer, the output voltage can be adjusted to the required level.  

for any details contact:-saikrishna504@gmail.com

design and implementation of forward converter

ABSTRACT

Modern electronic devices and gadgets require a constant, unfluctuating power supply as per their design and manufacturing. This task is accomplished by Switched Mode Power Supply, in short, SMPS. It provides a constant dc output for the working of the device. Generally, in SMPS, a flyback converter topology is used. There are some disadvantages with this flyback topology like high RMS and peak currents in the design, high flux excursions in the inductor, low efficiency, high cost, complicated control of the converter, lower bandwidth due to a zero in the response of the converter, the current feedback loop used in current mode control needs slope compensation in cases where the duty cycle is above 50% etc. Due to this, we go for forward topology in SMPS. In the forward converter, the power switch is turned on and off quickly at the given frequency because the transformer cannot operate on dc. So the pulses have to be generated by the driver IC like SG 3524 and its output is used to drive the switch. The switch output (pulsating dc) is connected to transformer. So, the input is transferred to the secondary side of the transformer.  In the secondary side, the rectifying and free wheeling actions take place and the ripple in the output is eliminated by the use of a large capacitance. The continuity in the circuit is maintained by the inductor so that a constant current is carried to the load from the rectifying and free wheeling actions. The load is resistive in nature and constant dc output is obtained. By varying the on- time and the duty cycle using potentiometer, the output voltage can be adjusted to the required level. 

if u want more information send me reguest to saikrishna504@gmail.com