무선 광대역 데이터 전송을 위한 OFDM 이더넷 모뎀장치의 구현

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 8㎒, The number of carrier if 2,000, The modulation methode is QAM16, The guard interval is 1/32. This was applied to the 18㎓ of a railroad field. The data speed was measured 11Mbps at LOS 1㎞ distance on l60㎞/h moving speed. This technique becomes expectation many at a railroad field application