中文摘要：

针对数字用户线路DSL（digital subscriber line）网络中存在串扰的问题，提出一种面向动态频谱管理的多级注水算法。该算法首先使用迭代梯度下降原理，将信号频谱划分为多个频带；然后，利用注水原理计算功率谱密度；最后，将近端用户承载比特从高干扰频带转移至低干扰频带。实验表明，多级注水算法复杂度低，收敛迅速，在ADSL2＋和VDSL2场景中均能发挥出理想的串扰抑制效果。

英文摘要：

To solve the problem of crosstalk in digital subscriber line （DSL） networks, we propose a multi-level water filling algorithm which is the dynamic spectrum management oriented. The algorithm first divides the signal spectrum into multiple frequency bands using iterative gradient descent principle; then employs water filling principle to compute power spectrum density, and finally moves the bits borne by the near-end users from high interference bands to low interference bands. Experiments show that the multi-level water filling algorithm has less computational complexity and much faster convergence speed, and plays an ideal effect of crosstalk limitation in both ADSL2 ＋ and VDSL2 scenarios.