REVIEW OF EFFICIENT COMBINATION OF DIGITAL MODULATION TECHNIQUES AND CODING SCHEMES FOR OPTIMIZED PERFORMANCE IN SATELLITE COMMUNICATION

Satellite system was traditionally believed to be power – limited on its downlink channels. However, today‟s increase in bandwidth – demanding application have also makes satellite system to be bandwidth – limited (spectrum). The fundamental strive for efficiency faced by design engineers is further reinforced by the challenge of striking balance between power and bandwidth which are the two critical communication resources of meeting the system performance requirements without severe financial implications. This paper expresses methodologies for making the most efficient combination of coding scheme and digital modulation technique under bandwidth – limited is and power – limited conditions in satellite link capacity. One of the method adopted in proving this solution is to poise a trade –off of the probability of error (PE) and the ratio of bit energy to noise-power spectral density (Eb/NO). Matlab was used to solve the huge mathematical complexities therein. The implementation of this mechanism in satellite industry will yield great financial saving whose second order effects are keeping satellite services providers in business, meet customers‟ demand and optimize satellite systems operations.