CPC方法需要收集所有通信链路的信道信息，系统开销大。

The CPC approach needs to collect channel information of all communication links in the system, which costs much system overhead.

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由于发射端获得的信道信息对预编码系统的性能有重要影响，因此，本文首先研究了动态CSIT模型。

Since the CSIT plays a key role in the precoding scheme, the CSIT acquisition model is studied firstly.

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香农指出，噪声限制了信息在保持无差错的情况下沿通信信道传递的速度。

Shannon showed that noise sets a limit on the rate at which information can pass along communication channels while remaining error-free.

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