多用户大规模MIMO系统能效资源优化算法

Resource optimization algorithm on energy efficiency in multi-user massive MIMO systems

针对多用户下行大规模MIMO系统,为满足用户QoS需求,建立关于发射功率、发射天线数、用户天线数的系统能效优化模型。区别于传统的利用迭代算法求解使系统能效最佳的发射功率,提出采用Lambert W函数分析得到系统最佳发射功率的闭式表达式,极大地降低了运算复杂度。并利用天线选择算法进一步对能效进行优化,即采用凸优化算法对能效进行优化。仿真结果表明,所提算法能有效提高系统能效,提升系统性能。

For multi-user downlink massive multi-input and multi-output(MIMO)system,an energy efficiency optimization model about transmit power,transmit antennas amount,and users amount underQoS requirements was established.Unlike conventional iterative algorithm to solve the optimal transmit power,a closed-form expression using the Lambert W function was proposed to obtain the optimal transmit power,which greatly reduced the computational complexity.Then an antenna selection algorithm was adopt to further optimize energy efficiency.And a convex optimization algorithm was used to solve the problem.Simulation results indicate that the proposed scheme can effectively improve energy efficiency and system performance.