中文摘要：

针对多载波DSL系统在指定用户数据速率的情况下尽量降低传输功率，以降低对系统中其它设备的电磁干扰，提出了一种多用户比特加载算法．首先对该算法模型进行了分析，提出了数学公式，考虑了比特最高限额及功率最大值限制的情况，然后分析该问题的优化解的复杂度，最后在DSL系统环境下进行仿真，结果发现，该算法在2个用户的情况下与最优解几乎相同，比离散化的贪婪迭代算法性能要好，计算复杂度也较低．

英文摘要：

A muhiuser bit-loading algorithm is proved to minimum the total power for a given target rate-sum in multiearrier digital subscriber lines （DSL） system in order to protect other services from electromagnetic interference. First, a system model and problem formulation is analyzed with the restraints of bit cap and power margin, then the complexity analysis and the simulation of the algorithm in DSL. Form the simulation, it can be seen that the performance of the proposed algorithm is almost the same as the optimal solution, and better than the iterative greedy water-filling algorithm with less complexity.