무선 광대역 데이터 전송을 위한 OFDM 이더넷 모뎀장치의 구현

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 key point 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 modulation methode is QAM16, The guard interval is 1/32. This was applied to the 18GHz of a railroad field. The data speed was measured 11Mbps at LOS 1Km distance on 160Km/h moving speed. This technique becomes expectation many at a railroad field application.