比例公平保证的MIMO-OFDM系统能效资源分配

针对下行多输入多输出-正交频分复用( MIMO-OFDM)系统，提出了满足在总功率限制和用户比例公平性约束下，使系统能量效率最大化的资源分配算法。为了降低计算复杂度，提出了两步优化的次优子载波和功率分配算法。第1步由子载波共享和平坦衰落假设得到估计的能效发射功率，并采用等功率分配方法完成子载波分配；第2步在子载波分配基础上完成能效最优的功率分配。仿真结果表明，所提算法以较低的复杂度逼近最优算法的性能，并且在保证用户比例公平性的同时带来明显的能效提升。

Proportional Fairness-Guaranteed Energy-Efficient Resource Allocation for MIMO-OFDM Systems

An energy efficient resource allocation algorithm for downlink multiple-input-multiple-output orthogonal frequency division multiple ( MIMO-OFDM) system was proposed to implement the energy effi-ciency ( EE) maximization, satisfying total power constraint as well as the proportional rate constraints. In order to reduce the computational complexity, a two-step subcarrier assignment and power allocation scheme was proposed to derive the suboptimal solution of the optimization problem. The estimated energy-efficient transmit power is obtained under assumption of flat fading and subcarrier sharing. The equal-power allocation-based method was adopted to carry out subcarrier assignment. Furthermore, the optimal energy-efficient power allocation was derived according to the result of the first-step subcarrier assign-ment. Simulations show that the proposed algorithm brings remarkable gains on energy efficiency and guarantees proportional fairness of the users.