基于树搜索算法的多用户MIMO系统的自由度分配

Degrees of Freedom Allocation for Multi-user MIMO System Based on Tree Search Algorithm

针对最大化多用户MIMO系统的和速率的问题,提出了将迭代式干扰对齐技术(Iterative Interference Alignment:IIA)和系统自由度(DoF)分配策略相结合的一种算法。系统的DoF分配是通过树搜索算法(Tree search)来实现的。理论分析及实验仿真结果表明,该算法获得的系统容量,接近遍历法(exhausting search:EX)的结果,但是在算法复杂性及收敛时间上明显优于遍历法。

Considering the problem that maximizing the sum rate of multi-user MIMO system, an algorithm that joints iterative interference alignment and allocation strategies of degrees of freedom （DoF） is proposed in this paper. DoF allocation of multi-user MIMO system is achieved via Tree Search algorithm. Theoretical analysis and simulation results show that the proposed Tree Search algorithm achieves sum rate performance near that of the exhausting search （EX） asymptotically, while the Tree Search algorithm has lower computation complexity and less convergence time.