In order to reduce the power dissipation,a reduced iterative power allocation algorithm with AMC is proposed combining with adaptive modulation and coding ( AMC) in E-UTRA to increase power efficiency and system throughput. First of all,the first power allocation is implemented by using water-filling algorithm,and then the allocated power is turncated to the power required by the highest AMC mode if it surpasses the power required by the highest AMC table for certain AMC set. The all truncated power is reallocated to raise the AMC rank. The simulation results show that the proposed algorithm can achieve higher system throughput with less iteration.%为进一步减少功率浪费，提高系统吞吐量，结合 E-UTRA 系统中自适应调制编码（ AMC ）技术，提出了一种联合AMC的降阶迭代功率分配算法。使用传统注水算法对用户进行首次功率分配，然后对超过支持最高调制编码方式所需功率的用户，削减分配功率到支持最高调制编码方式所需的功率，并将多出来的功率通过降阶迭代方式分配给其他用户，以使尽可能多的用户达到更高的调制编码方式。仿真结果表明，该算法能在较少迭代次数的情况下，取得较高的系统吞吐量。
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