4D-8PSK trellis coded modulation for high speed satellite communication

Abstract

In this paper unique approach of new digital communication system, 4D 8 PSK TCM Encoder design and simulation is presented. TCM Encoder with 11/12 code rate and 2.75 spectral efficiency has been implemented, Modulator specifications are same as given in Consultative Committee for Space Data System (CCSDS) used for satellite application[2]. TCM is combination of Encoding and Modulation, which improve noise performance of digital communication by 3 dB without any data rate loss or expansion of bandwidth. As the complexity of system increases coding gain of 6 dB can be achieved. That's why TCM referred as a bandwidth efficient modulation preferred by CCSDC. Specialized software for communication system simulation MATLAB Simulink is used for simulation; preferably communication and signal processing tools boxes are used.