18GHz 객실감시시스템의 터널구간에서의 영상전송특성 시험

초록

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 MHz. Ministry of Information and Communication(MIC) Notifies 18GHz 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 18GHz wireless video transmission system for safety is most important. In this paper. The characteristic of video transmission in tunnel is tested using 18GHz Microwave sample test system. it use OFDM modulation, transmission output power is 20dBm, sensitivity of receiver is -90dBm. The result of test is good quality for all pass of tunnel although multi-pass padding is big.