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http://dx.doi.org/10.9717/kmms.2012.15.1.032

Implementation of Location Based Services Using Satellite DMB System  

Kwon, Seong-Geun (경일대학교 전자공학과)
Lee, Suk-Hwan (동명대학교 정보보호학과)
Kim, Kang-Wook (삼성전자 무선사업부)
Kwon, Ki-Ryong (부경대학교 IT융합응용공학과)
Publication Information
Journal of Korea Multimedia Society / v.15, no.1, 2012 , pp. 32-39 More about this Journal
Abstract
In this paper, the implementation of location based services (LBS) using S-DMB (satellite-digital multimedia broadcasting) system was proposed. In S-DMB System, the frequency of transmitted signal is about 2 GHz which has a characteristics of strong straightness but weak diffraction so that there are many shade areas such as indoors and underground spaces. Therefore the signal transmitted from the satellite should be retransmitted by the earth repeaters called as gap filler. Because each gap filler has its own identification value, the gap filler ID introduces the area in which the gap filler was installed. Generally, the 51st data symbols of S-DMB pilot signal transmitted from the satellite are padded by dummy value and gap filler ID is embedded in this pilot symbol by the gap filler when S-DMB signals are retransmitted by gap fillers. So using gap filler ID of S-DMB system, LBS such as region registration, distance and time to destination, alarm of local area information could be implemented. In the experiment to prove the performance of the proposed LBS system using the gap filler ID of the S-DMB system, the firmware of S-DMB chip composing of RF and baseband parts was lightly modified so that application processor was able to manipulate the gap filler ID and the its related regional information.
Keywords
DMB; Pilot Channel; Gap Filler;
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