如果可以估计信道的参数，并将这些估计信息反馈给发送端，发送端就可以根据信道参数自适应调整发送策略。
When the channel can be estimated and this estimate is sent back to the transmitter, the transmission scheme can be adapted relatively to the channel characteristics.
如果可以估计信道的参数，并将这些估计信息反馈给发送端，发送端就可以根据信道参数自适应调整发送策略。
When the channel can be estimated and this estimate is sent back to the transmitter, the transmission scheme can be adapted relatively to the channel characteristics.
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