OFDM 이더넷 모뎀장치의 18㎓ 무선 광대역에서의 특성 시험

초록

The importance of the railroad is growing up. The construction of the urban railroad and the high-speed railroad is prearranged. The requirement about a broadband data transmission is growing bigger in the railroad at a high-speed movement. In this paper, We developed OFDM modem device that is the keypoint device of a railroad broadband wireless communication. OFDM modem is the system to transmit and receive a high-speed ethernet to a broadband wireless. It is composed of OFDM transmission unit and OFDM reception unit and ethernet interface unit. OFDM modulation parameter is as follow, The bandwidth is 8MHz, The number of carrier if 2,000, The modulationmethode is QAM16, The guard interval is 1/32. Thiswas applied to the 18GHz of a railroad field. The data speed was measured 11Mbps at LOS 1Kmdistance on 160Km/h moving speed. This technique becomes expectation many at a railroad field application.