This page consists of various works done by me; mainly my programming works, research works etc. Check these out. For any help please contact [email protected].

Thesis Work My thesis was on "An Approach to Increase Data Transmission Capacity in Coaxial Cable Communication System". Abstract: In this thesis work, an attempt has been made to investigate the performance of a Coaxial Cable Communication System. The whole work is done in three stages. In the first part, performances with various sampling rates, line codes, error correction codes and noises have been experimentally investigated using a baseband digital data transmission simulator. In the second part, a MATLAB simulator is developed to analyze a baseband signal transmission system which employs coaxial cable as a transmission channel. At this stage, effects of various line-codings on bit rate are observed at a bit error rate of 10-6 for the Matched and Butterworth filters. In the last part of this thesis, Code Division Multiple Access (CDMA) has been utilized to analyze the effect of providing multiple access in a coaxial cable system. In this part MATLAB simulation is extensively employed to investigate various aspects of a Coaxial Cable Direct Sequence (DS) CDMA system. It is found that the ultimate channel capacity can be increased by about 2.26 times, using DS – CDMA technique with high chipping rate. The simulators developed in the present thesis can simulate most of the phenomena which arise in a coaxial cable based digital communication system including Inter Symbol Interference, Channel Impairments, effects of noises, effects of line codes and multiplexing techniques etc. This software can evaluate the time and frequency domain representations and eye patterns at various stages as well as can plot various graphs of a coaxial cable based digital communication system. get full report in .pdf format MATLAB code used in this thesis work

The main part of my thesis is summerized in this unpublished paper "An Approach to Increase Data Transmission Capacity in Coaxial Cable using DS–CDMA" Abstract: In this paper an attempt has been made to improve the performance of a Coaxial Cable Communication System using direct sequence code division multiple access (DS – CDMA). To do this, the performance of a simple coaxial cable based baseband signal transmission system is evaluated and compared with the CDMA system keeping all the cable and system parameters unaltered. In this analysis, NRZ line code is used, 3rd order Butterworth filter is utilized as receiving filter and the receiver is considered as thermal noise limited. Bit error rate (BER) is calculated using the Gaussian Approximation. The effect of ISI, multiple access interference (MAI) and thermal noise is considered. The numerical results show that with increasing spreading factor, BER reduces when bit rate and number of simultaneous user is kept constant. At a BER of 10-6, the overall bit rate of the channel can be increased upto 6 times or further depending on the CDMA parameters. get full text in .pdf format MATLAB code

Project Work 8BIT DIGITAL CODE SWITCH (with voice operation) The objective of this project is to design and implement a device that will act as a switch which is able to be protected by a password. Only the person who knows the password can be able to turn the switch on. The password can be given by voice command using a computer. get full text in .pdf format Software to drive this device (I don't have enough space to upload it. To get it, email me.)

Other Works Fourier Plotter I made this program when I was in 2nd year 2nd semister. This program plots a periodic function if the expression of its Fourier components are given. The number of Fourier terms to be considered can be specified. It is a very nice program to understand the basics of Fourier Transform. Download Turna Sajja This is a Bengali word sorting program. Bengali word sorting follows a very complex algorithm due to the complexity in scripts. In this program even the compound letters and the 'kar's are handled with care. It is applicable to Bijoy Scripting system only. Download