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18㎓ 객실감시시스템의 터널구간에서의 영상전송특성 시험
정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),박종철(Park Jong-Chol) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The importance of broadband wireless communication implemented at subway tunnels is growing up. Specially, passenger monitoring system for the safety of the passenger is requested broadband transmission. The wireless transmission system for broadband video is request bandwidth of over 10 ㎒. Ministry of Information and Communication(MIC) Notifies 18㎓ wireless frequency for subway video transmission system. it is good that bandwidth is reserved sufficiently and influence of an electric wave is little. But, initial path loss is big and influence of multi-pass padding is big. So, electric wave characteristic is very bad. research of transmission characteristic of 18㎓ wireless video transmission system for safety is most important. In this paper. The characteristic of video transmission in tunnel is tested using 18㎓ Microwave sample test system. it use OFDM modulation, transmission output power is 20㏈m, sensitivity of receiver is -90㏈m. The result of test is good quality for all pass of tunnel although multi-pass padding is big.
18㎓ 다중통신을 위한 OFDM송수신 모듈 구현 (Implementation of OFDM Transceiver for Multiple Access at 18㎓)
정상국(Jeong Sang-Guk),안태기(An Tae-Ki),김백현(Kim Back-Hyun),최갑봉(Choi Gab-Bong),박종철(Park Jong-Chol) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The importance of broadband wireless communication implemented at subway tunnels is growing up. At 18㎓ wireless video transmission system, the transmitter requires a digital modulation method. At subway tunnel, A 18㎓’s influence of the multi-pass padding is strong. OFDM digital modulation that is strong for multi-pass padding is recommended. Duplexing methode uses FDD to transmit and receive broadband data at the same time. In the case of FDD we assign a private use channel each with the transmission at the receiving. In this paper, We implement multiple access wireless OFDM transceiver. We verified that one ground transceiver communicates with two car transceiver at the same time.
18GHz 차지상간 양방향 영상전송시스템의 도로 및 터널 구간에서 경로손실 특성
정상국(Jeong Sang-Guk),최갑봉(Choi Gab-Bong),안태기(Tae-Ki Kim),김백현(Back-Hyun Park),박종철(Park Jong-Chol),양동석(Yong Dong-Seok) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
It is increased that need of broadband multimedia service to make useful environment for user and to support the operation of railway system. So study of integrated data transmission in a subway and railway is activated. The research deals with pass loss characteristics of 18㎓ microwave that is assigned frequency of integrated data transmission in a subway and railway. It is used sample integrated transmission system in subway and railway of KRRI(korea railroad research Institute) at the tunnel and road. Specification of test sample system is blow. It use OFDM modulation, Wireless frequency is 18㎓ and 19㎓, Maximum output power is 20㏈m, Receive sensitivity is -90㏈m. The pass loss exponent and standard variation of road and tunnel is analyzed.