This paper represents a new active phase array antenna for Ku-band mobile service that will be possible in satellite broadcasting service. The main idea for the antenna is to use minimum active array element with cost-effective one-dimensional subarrays with inclined pencil beam structure for 34 dBi gain. For this antenna, we also used the squint beam tracking algorithm. This tracking gives different way to the traditional monopulse tracking method in tracking capability. Electronic scanning angle of beam peak in this antenna is over 12 wide only with 20 phase shifter elements for its scan ranges. This antenna with the attractive hybrid-tracking concept has about 142 times less array element than antennas with two-dimensional array.
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.
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