摘要
OFDM是一种无线环境下的高速传输技术,它采用一种不连续的多调制技术,将不同载波中的大量信号合并成单一的信号,从而完成信号传送。由于这种技术具有在杂波干扰下传送信号的能力,因此常常会被利用在容易受外界干扰或者抵抗外界干扰能力较差的传输介质中。由于在OFDM系统中各个子信道的载波相互正交,它们的频谱是相互重叠的,这样不但减小了子载波间的相互干扰,同时又提高了频谱利用率。由于地震监测系统中需要传输大量数据,因此OFDM技术在地震监测系统中将有广泛的应用。
Orthogonal Frequency Division Multiplexing （OFDM） is one of the high-speed wireless transmission technologies. It uses a kind of discontinuous multi-modulation, which combines a lot of signals of different sub-carrier into a single signal. This kind of technology is usually used in the media of transmission, which could easily be interfered or in the other words it has a poor capability of anti-interference due to noise waves. In the OFDM system the carriers of sub-channels are mutual orthogonal and their spectrums overlap each other. These factors not only decrease the interference among sub-carriers but also raise the rate of used spectrum. In the seismic monitoring system, there are massive data to transmit and so the OFDM technology can be used effectively in the seismic monitoring system.
出处
《四川地震》
2014年第1期29-31,共3页
Earthquake Research in Sichuan
