Author : Bhaskar Nandy

This paper focuses on the analysis of convolutional encoder with different constraint lengths ,different modulation techniques, different circuit configurations till we find the best possible circuit. The analysis is performed using MATLAB &SIMULINK. Circuit is then designed using PSPICE Schematic design suite to operate as an non systematic, convolutional encoder a code rate of 0.5 and constraint length 3. Random errors in any communication system is the most concerning factor since it makes the system vulnerable to security threats. A system being designed to prevent such treats consisting of the proposed encoder with Viterbi decoding using MATLAB Programming.

Keywords: PSPICE Schematic Design Suite; MATLAB &SIMULINK verR2013a; MATLAB Communication Tool box; Convolutional Encoder ;Code Rate; Constraint length; Generator Polynomial; Poly2trellis structure; State diagram; Trellis diagram ;Viterbi decoding

Article published in International Journal of Current Engineering and Technology, Vol.6, No.2 (April-2016)