On the Performance of Beam Division Nonorthogonal Multiple Access for FDD-Based Large-Scale Multi-User MIMO Systems

被引:19
作者
Choi, Yong I. [1 ]
Lee, Jae W. [1 ]
Rim, Minjoong [2 ]
Kang, Chung Gu [1 ]
机构
[1] Korea Univ, Sch Elect Engn, Seoul 02841, South Korea
[2] Dongguk Univ, Dept Informat & Commun Engn, Seoul 04620, South Korea
关键词
Multi-user multi-input multi-output (MU-MIMO); beam division multiple access (BDMA); non-orthogonal multiple access (NOMA); frequency division duplexing (FDD) system; BD-NOMA; inter-beam interference; weighted sum rate (WSR); weighted minimum mean square error (WMMSE); CAPACITY; DESIGN;
D O I
10.1109/TWC.2017.2705111
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
For the frequency division duplexing-based large-scale multiple-input multiple-output (MIMO) systems, we consider a multi-user MIMO (MU-MIMO) non-orthogonal multiple access (NOMA) scheme, referred to as beam division-NOMA (BD-NOMA), which is featured by a long-term feedback-based user grouping and clustering, along with a short-term feedback-based BD-NOMA scheduling. The performance of BD-NOMA is not warranted in practice because near users are severely interfered by strong signals for the far users of other beams, and furthermore, the long-term feedback-based user grouping and clustering might result in short-term inter-beam interference. We consider the short-term feedback-based joint optimization problem of user selection and power allocation for NOMA in each beam and system-wide power allocation for MU-MIMO, dealing with both intra-beam and inter-beam interference at the same time. We formulate a joint optimization problem for a large-scale MIMO system with the multiple channel quality indicators-based short-term feedback. In our analysis, we reformulate the original problem into an equivalent one that can be solved iteratively with the weighted minimum mean square error-based algorithm. Then, the performance analysis is presented to conclude that the proposed optimization is essential for enabling BD-NOMA to outperform beam division multiple access, especially when inter-beam interference becomes critical.
引用
收藏
页码:5077 / 5089
页数:13
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