摘要
在采用空分复用技术的多用户多输入多输出下行链路中,有限的空域信道资源限制了系统容量。针对这一问题,提出了一种新的基于自适应空分复用的分组多用户分集方案。针对空分复用算法的特点,该方案首先以信道响应矩阵主右奇异向量的互相关大小为度量,将全部用户分为互相关最小的若干组;然后采用一种新的自适应空分复用算法,求出每一组用户传输时所能获得的系统容量,并将信道分配给容量最大的那一组用户。仿真结果表明,所提出的方案不仅能保证信道资源调度的公平性,而且通过引入多用户分集和自适应空域信道分配,显著地提升了系统容量。
In the multi-user multiple-input multiple-output （MIMO） systems employing space division multiplexing （SDM）, the downlink capacity is limited by the spatial channel resources. In this paper, a novel grouped multi-user diversity （GMUD） scheme is proposed on the basis of adaptive SDM. In view of the characteristics of SDM algorithm, the scheme first divides all users into groups in such a way that the users whose principal right singular vectors have the least cross correlation are put into the same group. Then using a novel adaptive SDM scheme, the attainable capacity of each group is computed, and the channel is allocated to the group with the maximal capacity. Simulation results show that the proposed GMUD scheme can not only provide fair resource utilization, but also dramatically improve the system capacity due to the adoption of multi-user diversity and adaptive spatial channel allocation.
出处
《电波科学学报》
EI
CSCD
北大核心
2007年第3期424-429,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金(60372055)
国家高科技发展计划项目(2003AA123320)
博士点基金(20020698024
20030698027)
关键词
多用户
多输入多输出
下行链路
多用户分集
空分复用
multi-user, multiple-input multiple-output, downlink, multi-user diversity, space division multiplexing
