(JBE Vol. 21, No. 5, September 2016) (Special Paper) 21 5, (JBE Vol. 21, No. 5, September 2016) ISS
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1 (JBE Vol. 21, No. 5, September 2016) (Special Paper) 21 5, (JBE Vol. 21, No. 5, September 2016) ISSN (Online) ISSN (Print) VHF T-DMB a), a), b), c) A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency Sung-Kyu Park a), Sang-Un Lee a), Su-Hyun Chae b), and Gooman Park c) T-DMB VHF, UHDTV VHF. DMB/FM CAR Radio DAB T-DMB. UHDTV SFN UHDTV OFDM T-DMB. VHF UHDTV SFN VHF. Abstract This study analyzed the properties of VHF band and suggested an efficient VHF band application plan for digital radio and UHDTV broadcasting through the experiment by the house T-DMB device in practical user environment. In order to find an efficient frequency band for digital radio broadcasting, this study examined first, to check the times of drop-out receive occurring in the audible area using a DMB/FM CAR Radio for T-DMB that has the characteristics of DAB. Second, this article explored the phenomenon of feedback loops in the same channel using a T-DMB house gap filler transmitting the signal by the same OFDM modulation scheme with UHDTV for configuring suitable SFN transmission network of the UHDTV broadcasting. Based on these experiments, this study suggested a suitable VHF band for digital radio and an efficient utilization of the VHF frequency band for the SFN network configuration of UHDTV. Keyword : Digital Radio, UHDTV, VHF, Feed Back, T-DMB a) (Dong-Ah Institute of Media and Arts, Division of Broadcasting Engineering) b) SBS (SBS, Radio Engineering Team c) IT (Seoul National University of Science and Technology, Dept Electronics and IT Media Engineering) Corresponding Author : (Gooman Park) gmpark@seoultech.ac.kr Tel: ORCID: Manuscript received July 27, 2016; Revised September 2, 2016; Accepted September 2, 2016.
2 3 : VHF T-DMB (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) TV, UHF(Ultra High Frequency) 700 (698~806) VHF(Very High Frequency) (54~216) TV TV. UHF (470~698) HDTV(High Definition Television), VHF T-DMB(Terrestrial Digital Multimedia Broadcasting). VHF (L-VHF) VHF (H-VHF) FM (88~108) FM(Frequency Modulation). [ 1] VHF UHF 700 UHDTV(Ultra HDTV). TV HDTV UHDTV, FM [1]. FM,,, Delay.., [2]. Delay., FM CD. TV DRM + Digital Radio UHDTV HDTV HD-Radio DAB/DAB+ / LTE (M Hz) (M Hz) L-VHF TV CH2~CH4 L-VHF TV CH5~CH6 L-VHF FM 88 ~ 108 H-VHF TV / DM B CH 7~ CH 13 UHF TV/HDTV CH 14~ CH M Band TV/HDTV CH 52~ CH 68 Ch 7 Ch 8 Ch 9 Ch10 Ch11 Ch12 Ch 13 DM B A DM B B DM B C DM B M BC DM B KBS DM B SBS M Hz 6 M Hz UHD TV 12 Guard Band 8 EM G Tele 10 M obile Tele 20 Gud Band 8 UHD TV 18 Gud BW 2 EM G Tele 10 M obile Tele 20 Gud BW (M Hz) VHF/UHF Fig. 1. VHF/UHF frequency diagram in Korea & the mode of digital radio
3 (JBE Vol. 21, No. 5, September 2016) TV 2~6 VHF (54~88) TV 7~13 VHF (174~216) DMB. VHF VHF FM (88~108 ) FM [3].., [4].. DAB(digital Audio Broadcasting) OFDM(Orthogonal Frequency Division Modulation) T-DMB [2][3]., UHDTV. T-DMB [3]. T-DMB CAR Radio VHF T-DMB. T-DMB SFN(Single Frequency Network) OFDM UHDTV (Gap Filler) Feedback. VHF UHF UHDTV SFN.. VHF 1. VHF VHF VHF VHF FM. VHF 174~216, TV 7~13. TV [5]. TV TV TV. TV. VHF LOS(line of sight) [1][6].. VHF UHF LOS VHF [7]. TV VHF. [ 1] VHF 10. T-DMB TV 15 T-DMB. T-DMB SFN
4 3 : VHF T-DMB (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) 1. TV TV DMB ( : SBS) Table 1. Compare the Frequency assignment of Analog TV & Digital TV with DMB in Capital Region. (source: SBS) Analog TV Digital TV T-DMB TX TX Physical Pos. Channel Power Power Pos. Frequency Power Channel. Ch KW Ch.16(6-1) 2.5KW 2KW CH. 6 50KW Ch.68(6-1) 5KW 2KW Ch.55 10KW Ch.29(6-1) 1Kw 1KW - 90W 20W Ch W - SFN 90W Ch W Ch.58(6-1) 90W Freq. 20W - Ch.54(6-1) 90W 1KW Ch W - Ch.12C 90W Ch.60 10W W Ch.39 10W - 20W - 1KW 100W Ch W Ch.58(6-1) 90W 20W Ch44 10W - 20W 20W - Ch.26(6-1) 200W 90W Ch W Ch.29(6-1) 20W 90W VHF. VHF DMB (DMB Ensemble) 1, DAB+ [3]. DAB T-DMB FM FM VHF VHF 54~88. TV 2~6. VHF (174~ 216 ), FM (88~108 )., TV Long Yagi Antenna. FM TV Ch. 5~6 FM. DRM+ Out of Band [3]. FM FM All Digital Radio. VHF DAB DAB+ VHF FM. 3. FM FM VHF VHF. FM. FM. FM 10KW 1 [9]. (2015) 5 TV
5 (JBE Vol. 21, No. 5, September 2016) (76.2%) (73.7%) PC/ (29.5%), (8.9%), (7.1%). 22.8% 2010 (30.7%), 30~ %, 32%. 1 21, 1 40 [10].... DAB+(Digital Audio Broadcasting) IBOC(In Band On Channel) DRM+(Digital Radio Mondial). OFDM T-DMB UHDTV SFN. T-DMB Feedback UHDTV SFN VHF. 2.. III. 1. TV VHF T-DMB UHDTV. VHF DMB/FM CAR Radio DMB Gap Filler VHF FM. VHF. DAB T-DMB 1.,, DAB? 2. Feedback, UHDTV, SFN? 3. DAB.
6 3 : VHF T-DMB (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) DAB T-DMB DMB/FM CAR Radio DAB VHF L-Band. : ~ :,,, : T-DMB, 12C Ensemble, SBS V-Radio Channel : T-DMB DMB/FM CAR Radio [ 2] T-DMB 2. - T-DMB Table 2. Seoul-Ansung Mobile Receive Test to check the Number of Silent on T-DMB Radio Channel Mobile Recv. Course (Seoul Ansung) 150Km Silent(Drop out) Times 1 Sec. 3 Sec. 5 Sec 10 Sec more than 20s Total Kyung Boo Exp.Way Joong Boo Exp.Way Seahaeann Exp.Way Yangjee National Road (Analog FM Radio) No No No No No No. FM FM. SBS SBS Love FM SBS Power FM SBS T-DMB V-Radio(visual Radio) 2. SBS T-DMB Ensemble ( : DABAIR II (SMCNS )) Fig 2. The Structure of The SBS T-DMB Ensemble Stream (TESTER : DABAIR II (SMCNS Co.))
![3 7 2 방송공학회논문지 제21권 제5호, 2016년 9월 (JBE Vol. 21, No. 5, September 2016) 운용하였으므로 서로 비교 V-Radio채널에서 측정이 가능했다. 지금은 SBS 별도의 음악만 방송하고 있다. [그림 2]는 전문가용 장비를 사용하여 SBS T-DMB 블의 스트림 구조를 보여주고 있다. 4.](/docs-images/101/151325638/images/7-0.jpg "T-DMB Gap Filler Feed Back 앙상 실험 째 실험의 목적은 하나의 채널로 SFN 전송망 구현 시 소출력 중계기 및 가정용 갭 필러 사용에서 송ㆍ수신 안 두번 테나 위치 선정과 단일채널 송신주파수 Feed Back 현상 차 단이 매우 어려운 점을 확인하기 위한 실험이다.")
7 3 7 2 방송공학회논문지 제21권 제5호, 2016년 9월 (JBE Vol. 21, No. 5, September 2016) 운용하였으므로 서로 비교 V-Radio채널에서 측정이 가능했다. 지금은 SBS 별도의 음악만 방송하고 있다. [그림 2]는 전문가용 장비를 사용하여 SBS T-DMB 블의 스트림 구조를 보여주고 있다. 4. T-DMB Gap Filler Feed Back 앙상 실험 째 실험의 목적은 하나의 채널로 SFN 전송망 구현 시 소출력 중계기 및 가정용 갭 필러 사용에서 송ㆍ수신 안 두번 테나 위치 선정과 단일채널 송신주파수 Feed Back 현상 차 단이 매우 어려운 점을 확인하기 위한 실험이다. 향 후 지상 트 파 UHDTV방송 구현 시 저비용으로 아파 나 오피스 출 그림 3. T-DMB 갭 필러 수신 상태 실험 위치 Fig 3. Position of the Receive test by T-DMB gap filler 건물 설치하거나 가정에서 소규모 갭 필러를 이용하어 가정 내 무선 수신환경을 구성 하고자 할 때 Feedback 발생은 출력 저하나 송ㆍ수신 안테 나 분리 등 많은 숙제를 남기게 된다. 등 전파 음영지역에 소 력중계기를 [11] 이 실험은 현재 국내 방송환경에서 OFDM 변조를 사용 룰 수 있는 특징을 이용하고 있다. 실험 방법으로 가정용 초소형 중계기인 갭 필러(Gap Filler)를 이용하여 아파트 베란다와 거실에서 갭 하고 있는 T-DMB가 SFN 전송망을 이 필러의 위치와 송수신 안테나 분리 여부에 따라 Feedback 측정한다. 이 실험의 목적은 현재 추진되고 있는 UHDTV 이용 환경을 하나의 채널 할당만으 로 어느 정도 원활한 SFN 망 구성과 편리한 수신환경을 그림 4. 실험에 이용된 T-DMB 수신기와 가정용 갭 필러 Fig 4. The T-DMB Receiver & Gap Filler for these test 현상과 수신환경 변화를 구성할 수 있는지 확인하는데 있다. 처음에는 갭 필러의 송ㆍ수신 안테나를 분리하지 않고 동일한 위치에 두고 실험하였다. 창가에서 거실 내부로 들어가면서 1.5m 간격으로 갭 필러를 이동하면서 파워 ON OFF 절체 시 각각 DMB 수신기의 수신 상태의 변화를 파악하였다. 두 번째는 갭 필러의 송ㆍ수신 안테나를 서로 격리시 킨 후 실험을 하였다. 창가에서 거실 내부로 1.5m 간격으로 갭 필러를 이동 하면서 파워 ON OFF 절체 시 각 각 DMB 수신기의 수신 상태의 변화를 파악하였다. 그림 5. 갭필러 송ㆍ수신안테나 동일위치(좌), 이격위치(우) 사진 Fig 5. Same position(left) & Isolated(Right) of the RX,TX ANT for the T-DMB Gap Filler [그림 3]과 [그림 4]는 측정 위치와 실험 장비 사진이 며, [그림 5] 송.수신 안테나와 격리 유무를 보여준다.
8 박성규 외 3인: VHF대역의 효율적 재활용을 위한 T-DMB 수신환경 조사 (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) 33 7 그림 6. 송수신 안테나 동일위치 시 갭 필러와 수신기 동작상태 Fig 6. State of the DMB Receiver at Gap Filler ON/OFF when Tx & Rx Antenna is same position 그림 7. 송수신 안테나 격리 시 갭 필러와 수신기 동작상태 Fig 7. State of the DMB Receiver at Gap Filler ON/OFF when Tx & Rx Antenna is isolated [그림 6]을 보면 송ㆍ수신 안테나를 동일위치에 놓고, 갭 필러의 전원을 켰을 때, 수신기의 수신 상태를 알려 주는 눈금수가 오히려 줄어드는 것을 확인할 수 있었 [그림 7]을 보면 송ㆍ수신 안테나를 서로 격리 시키고 갭 필러의 전원을 켰을 때, DMB 수신기의 수신 상태 를 알려주는 눈금이 이번에는 증가하였음을 확인할 수 두 번째 측정 때에는 송ㆍ수신 안테나를 서로 격리시 키고 실험을 하였다. [그림 6]과 [그림 7]의 결과를 [표 3]으로 정리하여 보 다. 있었다. 여주고 있다.
9 (JBE Vol. 21, No. 5, September 2016) 3. DMB Table 3. Compare with the level of DMB Receiver by Gap Filler antenna is isolated or not. TEST POSITION ANT. POSITION Same Located Isolated Gap Filler Power OFF ON OFF ON Level of Received IV. 1. T-DMB SBS T-DMB Ensemble Stream SBS V-Radio (, ) 150Km,, Silent(Drop Out). DMB/FM. SBS T-DMB V-Radio DAB H.264, BSAC(Bit Sliced Arithmetic Coding). SBS FM. V-Radio FM SBS V-Radio. SBS T-DMB V-Radio 150Km 50. FM. FM T-DMB 3~5 Delay. FM (10KW ) 1, T-DMB [ 1] (2KW) 15., T-DMB 15 SFN ,, DAB? 1. VHF T-DMB. VHF DAB. 1 T-DMB Ensemble (1.536 BW) DAB+ 24, FM DAB+. 3. T-DMB Gap Filler Feedback COFDM UHDTV
10 3 : VHF T-DMB (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) T-DMB SFN Feedback. ON/OFF DMB Level.. ON DMB,., ON, DMB,. SFN, (DOCR, Digital On Channel Repeater). ICS(Interference Cancelation System) Feedback Canceler, Feedback. Feedback Feedback, UHDTV SFN? SFN.. UHDTV Feedback. VHF F1 UHF F2 UHF F2 UHF F2 UHF F2 F2 8. VHF F1 UHF F2, 2 SFN Fig 8. A diagram of SFN by two Frequency that are VHF F1 & UHF F2
11 (JBE Vol. 21, No. 5, September 2016) UHDTV. [ 8] VHF, UHF Feed Back., Feedback, F1 F2 SFN. UHDTV UHDTV. VHF T-DMB, DMB. V. DMB/FM CAR Radio DMB Gap Filler T-DMB Feedback UHDTV SFN. T-DMB Radio - 150Km 50. VHF. 1 FM VHF DAB VHF. VHF FM, FM.,. FM FM VHF. T-DMB Feedback Feedback,.,. UHDTV UHF SFN Feedback. UHDTV SFN., UHDTV F1 VHF, F1 UHF F2. [ 9] VHF
12 3 : VHF T-DMB (Sung-Kyu Park et al.: A Research On the T-DMB Received Environment For the Efficient Reuse of the Band of VHF Frequency) 9. VHF Fig 9. Suggested solution that the Efficient Reuse of the Band of VHF Frequency VHF UHDTV, VHF DRM+, FM.. TV. UHDTV. (References) [1] Sang-Woon Lee, 'Digital Radio Broadcast II', Broadcasting & Technology, vol 196, pp 152~159, Apr [2] Suhuyn Chae, A study on the Differenceces of Terrestrial Broadcasters on Transmission System Determinants of Digital Radio Broadcasting, a graduation thesis, Seoul National University of Science & Technology, pp.1~112, [3] Yong-Tae Lee,'The digital radio comparison experimental broadcasting business and digital radio technical brief', The digital radio comparison experimental broadcasting promoting council, Oct [4] ETSI ES V3.2.1,' Digital Radio Mondiale (DRM) System Specification', ETSI, Jun [5] Richard Paik, ' Digital Broadcast Technology And Digital Radio', KETI, Jul [6] Jung-Min Joo, 'The digital radio policy present condition and improvement plan', Korean Broadcaster's Association Magazine, Feb [7] Sang-Woon Lee, 'the introduction of digital radio and need for the frequency', vol.17, no.2, pp 83~93, Korea Society Broadcast Engineers Magazine, Apr [8] Yung-Jun Joe, 'The digital radio service trend using the broadcasting and Internet',Korea Society Broadcast Engineers Magazine, vol. 17. no.2, Apr [9] Seung-Kyu Park, Goo-Man Park, A Study on the AM/FM Digital Radio for Practical Use Based on DRM and DRM+, Journal of Broadcast Engineering,, vol 17, pp. 990~1003, [10] Korea Communication Commision, A Study on the Behavior of Using the broadcasting medium 2015, [11] Seung-Kyu Park, Goo-Man Park, A Study on Terrestrial UHDTV Broadcasting and Construction of Direct Reception Environment by DVB-T2, Journal of Broadcast Engineering,, vol 18, no. 4, pp. 572~588, [12] Goo-jae Gil, The Technic of DMB system, Jinhan M&B, : : : IT : ~1991 : KBS, ~2015 : SBS TV, ~ : - ORCID : - :,,
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