QoS 개선과 서비스 커버리지 확장을 위한 단일 주파수망 지상파 DMB 최적화 배치

다국어 초록 (Multilingual Abstract)

This paper suggests the method to extend service area by using the transmit offset delay in T-DMB single frequency network (SFN). In general, synchronization of the transmit time of all site can be done by using the reference clock of GPS, which dose not reflect the details geographical characteristics and transmit specifications of each site. Applying the site-specific transmit offset delay, we could extend the service area of SFN T-DMB. Applying the transmit offset delay, it is found that the signal quality in the region of weak receive field strength was improved and upto 4~8 km service area expansion was achieved by satisfying the minimum field strength (45 dB㎶/m) recommended by the Korea Communications Commission (KCC). Site-specific offset delay was calculated considering the geographic service area characteristics, distribution of electric field strength between neighboring sites and site-specific service target area. Experiments were carried out in order to analyze impact of calculated offset delay on the T-DMB SFN and also to confirm that the offset delay extends T-DMB service coverage. The experiment was done in metropolitan T-DMB service areas.

참고문헌 (Reference)

1 김병수, "지상파 DMB 데이터 서비스의 TPEG프로토콜을 이용한 Assisted GPS 항법 시스템의 설계 및 구현" 한국통신학회 35 (35): 1618-1623, 2010

2 박성익, "T-DMB의 SFN을 위한 등화형 동일채널 중계기" 한국방송∙미디어공학회 13 (13): 365-379, 2008

3 Joongkun, Lim, "Plan of construction Broadcast Transmission network of Terristial DMB" 9 (9): 1-3, 2004

4 Ligeti, Agnes, "Minimal cost coverage planning for single frequency networks" 50 : 78-87, 1999

5 In-hwa Choi, "Digest of Technical Papers" 1-2, 2009

6 Im Kwan-Chul, "Development of ETI Management System based on T-DMB" 845-848, 2006

7 Zhixing Yang, "Channel estimation of DMB-T" 2 : 1069-1072, 2002

8 Hyu- Sik Kim, "A study on the Hybrid Broadcasting System Using Data Communication in Local Area" 2007