注水算法是根据某种准则，并根据信道状况对发送功率进行自适应分配，通常是信道状况好的时刻，多分配功率，信道差的时候，少分配功率，从而最大化传输速率。实现功率的“注水”分配，发送端必须知道CSI。-A water-filling algorithm is based on the criteria according to channel conditions and the transmission power allocation for adaptive usually good channe