Not only space-time coding in the MIMO but also demodulation in the OFDM, the rather exact CSI is essential parameter for dealing with data in the MIMO-OFDM.

• 在MIMO-OFDM系统中，不论是对MIMO进行空时处理，还是对OFDM进行相干解调，都需要较为准确的CSI作为数据处理的必要参数。