한국해양대학교

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차세대 T-DMB 시스템의 부가서비스 제공을 위한 계층적 전송방식에 대한 연구

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dc.contributor.author 배종태 -
dc.date.accessioned 2017-02-22T07:05:59Z -
dc.date.available 2017-02-22T07:05:59Z -
dc.date.issued 2009 -
dc.date.submitted 56904-11-11 -
dc.identifier.uri http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002175933 ko_KR
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/10265 -
dc.description.abstract The quality of traditional analog radio broadcasting systems has significantly deteriorated in recent years, due to serious electromagnetic pollution in urban areas, especially in mobile environments. Among the new broadcasting systems, Digital Audio Broadcasting (DAB), which is based on the Eureka-147 standard, provides CD-quality audio broadcasting services for fixed, portable and mobile applications, and has been recognized as a promising solution. Recently, the DAB system was announced as the official transmission specification of the Digital Multimedia Broadcasting (DMB) system in Korea. The DMB system has a 1.7Mbps throughput, which is sufficient for multimedia broadcasting services as well as CD-quality digital audio services. However, the throughput is reduced to 1.152Mbps when we take into account the overhead such as bits needed for synchronization, error correction and multiplex configuration information. Therefore, multimedia broadcasting services have a low throughput. Recently, there is a need to upgrade the conventional T-DMB system, in order to provide additional services and a higher throughput for multimedia broadcasting services. In this thesis, we propose a structure for an advanced T-DMB (AT-DMB) system, which is based on Eureka-147, with UEP coding methods and hierarchical 16QAM/64QAM modulation, to provide additional services while maintaining the BER performance. A hierarchical modulation scheme, strong channel code and unequal error protection (UEP) are applied to the conventional T-DMB system, in order to enhance the conventional T-DMB system and provide additional mobile user services. Furthermore, this thesis proposes a non-uniform 16QAM/64QAM modulation scheme combined with various bit splitting methods and coding methods such as iterative codes. The conventional T-DMB system based on Eureka-147 has the approved serial concatenated coding scheme. This thesis also applies the serial concatenated coding scheme as an HP(High priority) stream coding scheme, in order to provide a continuous conventional T-DMB service to subscribers. The performance gap between HP and LP(Low priority) streams is very large. This means that the performance of the HP and LP streams involves trade-offs, when applying the same coding method. If the performance of the LP stream is poor, there is no point in providing the LP stream to subscribers. Therefore, this thesis focuses on reducing the performance gap between the HP and LP streams. This is why this thesis applies iterative codes to the LP stream. Among iterative codes, double binary turbo codes and LDPC (low density parity check) codes are good candidates for the AT-DMB system, because they approach the Shannon limit performance and involve a simple puncturing device and a flexible block size/coding rate combination. The proposed AT-DMB system model with the UEP coding method, hierarchical modulation and bit splitting method provides a means of achieving high performance, multimedia broadcasting via the conventional T-DMB system. -
dc.description.tableofcontents 제 1 장 서론 = 1 제 2 장 지상파 DMB 시스템 모델 = 3 제 3 장 차세대 지상파 DMB 시스템 모델 = 7 제 3-1 절 차세대 지상파 DMB 시스템 개발의 필요성과 개념 = 7 제 3-2 절 계층적 변조방식 = 10 제 3-3 절 UEP(Unequal Error Protection) 시스템 = 14 제 4 장 부가서비스 복조를 위한 비트분리방법 = 17 제 4-1 절 LLR 방법 = 18 제 4-2 절 MAX 방법 = 21 제 4-3 절 Center focusing 방법 = 22 제 4-4 절 복잡도 비교 = 24 제 5 장 부가서비스에 고려되는 채널 부호화방법 = 25 제 5-1 절 Double binary turbo 부호 = 26 제 5-2 절 DVB-S2 규격의 LDPC 부호 = 31 제 5-3 절 IEEE 802.16e에 적용된 LDPC 부호 = 37 제 6 장 시뮬레이션 결과 = 40 제 6-1 절 시뮬레이션 파라메터 = 40 제 6-2 절 비트분리 방법에 따른 시뮬레이션 결과 = 42 제 6-3 절 부가서비스의 부호화 방식에 따른 시뮬레이션 결과 = 44 제 7 장 결론 = 54 참고문헌 = 56 -
dc.language kor -
dc.publisher 한국해양대학교 대학원 -
dc.title 차세대 T-DMB 시스템의 부가서비스 제공을 위한 계층적 전송방식에 대한 연구 -
dc.title.alternative A Study on Hierarchical Transmission Method for Additional Service of Advanced T-DMB System -
dc.type Thesis -
dc.date.awarded 2009-02 -
dc.contributor.alternativeName Bae -
dc.contributor.alternativeName Jong tae -
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전파공학과 > Thesis
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