基于最小速率的MIMO多接入信道容量和最优功率分配策略

Minimum-Rate Capacity and Optimal Power Allocation for MIMO Fading Multiaccess Channels

分析了平均功率受限条件下,基于最小速率约束的MIMO多接入信道容量域,并给出了最优功率分配策略.策略分为两个步骤:第一步分配给每个用户所有信道状态下,保证最小速率的最小功率;第二步采用多级注水分配剩余功率最大化遍历容量.分析表明顺序译码是获取容量的有效手段,数值结果显示出,策略在满足最小速率约束要求下获得了显著的容量增益,取得了很好的性能折衷.

The capacity region with average power constraints of MIMO fading multi-access channels based on minimum rate requirements is analyzed and the optimal power allocation strategy is suggested. The strategy is a two-step process, the allocation of the minimum power required to achieve the minimum rates and the optimal allocation of the excess power to maximize the ergodic rates. It is shown the minimum-rate capacity can be achieved by successive decoding. The numerical results show that, the strategy provides notable capacity gain and good tradeoff in performance.