在多用户MIMO系统中,在天线间或用户间进行发射功率分配,可以显著提高系统总容量.本文针对多用户M IMO系统中的下行链路,在多用户迭代注水算法的基础上,提出一种联合用户-天线功率分配算法,在进行多用户迭代注水之前,首先基于信漏噪比(SLNR)进行用户间功率分配.仿真结果显示,与多用户迭代注水算法及仅进行用户选择的多用户迭代注水算法相比,本文提出的算法大大提高了系统总容量.
In multi-user MIMO downlink channels,power allocation between antennas or users can improve sum capacity.Based on iterative water-filling algorithm,a joint user-antenna power allocation algorithm is proposed for multi-user MIMO downlink channels.Before iterative water-filling,the proposed algorithm allocate power between users based on SLNR at first.The simulation result shows that sum capacity of the proposed algorithm is better than the iterative water-filling algorithm and the user selection based iterative water-filling algorithm.