Satellite-DMB applied to the 8PSK hierarchical modulation

Satellite digital multimedia broadcasting (S-DMB) system is a service for private users with characteristics of personal concept that broadcasting service is taken by the mobile phone or terminals of vehicle anytime and anywhere. We need to modify the modulation scheme in order to increase more transmission capacity and maintain the channel bandwidth. In this paper we present the primary S-DMB system and the transmission schemes for backward compatibility (BC) mode that exploits the hierarchical modulation to improve the channel capacity and maintain performance of the currently deployed system. And we propose the new total S-DMB system block diagram and channel coding for efficient performance of BC mode and analyze the log likelihood ratio (LLR) algorithm for demapping of the hierarchical modulation of BC-8PSK.