说明：  正交频分复用技术是 对单载波上调制的高速数据流进行分流，成为多股低速子数 据流，在多个子载波上并列进行传输。由于各子数据流速率均仅占原数据流的小部分，也就意味着符号周期增大到原来的许多倍，要比信道极限延迟扩展要大得多，于是宽频选择信道就被划分成了多个窄平衰落信道，这样就 具备了较强的抗 脉冲干扰以及抗多径 衰 落的性能，在高速无线 数 据的传 递输送中尤为适用。
(Orthogonal Frequency Division Multiplexing (OFDM) is a single carrier up-modulation technique. High-speed data streams are diverted into multiple low-speed sub-streams Data streams are transmitted in parallel on multiple subcarriers. Because Each sub-data stream rate only accounts for a small part of the original data stream. It means that the period of the symbol increases many times as much as before. It is much larger than the limit delay spread of the channel, so it is broadband. The selection channel is divided into several narrow flat fading channels. In this way, it has strong anti-impulse interference and anti-multiple. Performance of path fading in high-speed wireless data transmission Especially suitable for delivery)