求翻译：OFDM是一种无线环境下的高速传输技术。无线信道的频率响应曲线大多是非平坦的，而OFDM技术的主要思想就是在频域内将给定信道分成许多正交子信道，在每个子信道上使用一个子载波进行调制，并且各子载波并行传输。这样，尽管总的信道是非平坦的，具有频率选择性，但是每个子信道是相对平坦的，在每个子信道上进行的是窄带传输，信号带宽小于信道的相应带宽，因此就可以大大消除信号波形间的干扰。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。是什么意思？

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OFDM is a wireless environment, the high-speed transmission technology. Wireless Channel frequency response curve of most of the non-flat, and the main ideas OFDM technology is in the frequency domain for a given channel is divided into many orthogonal sub channel, in each channel on a carrier modul

OFDM is under one kind of wireless environment high speed transmission technology.Wireless channel frequency response curve mostly right and wrong smooth, but the OFDM technology main thought will be assigns the channel in the frequency range to divide into many orthogonal sub-channels, will use a s

OFDM is a high-speed transmission technology in the wireless environment. Wireless channels are mostly non-flat frequency response curve, main idea is in frequency domain for OFDM technology within a given channel is divided into many orthogonal subchannel, on each subchannel using a sub-carrier mod

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