说明：  OFDM 正交频分复用)是一种多载波调制技术。因其能有效对抗频率选择性衰落，克服信号符号间干扰，可以将OFDM与MIMO进行高效结合，实现高速数据传输
(OFDM (orthogonal frequency division multiplexing) is a kind of multi-carrier modulation technology, because it can effectively combat the frequency-selective fading, and overcome the inter-symbol interference, OFDM and MIMO can be combined efficiently to achieve high-speed data transmission)