Cyclic Interference Alignment for Full-Duplex Multi-Antenna Cellular Networks

被引:12
作者
Shin, Wonjae [1 ]
Lim, Jong-Bu [2 ]
Choi, Hyun-Ho [3 ]
Lee, Jungwoo [1 ]
Poor, H. Vincent [4 ]
机构
[1] Seoul Natl Univ, Dept Elect & Comp Engn, Seoul 08826, South Korea
[2] Samsung Elect Co Ltd, Next Generat Commun Business Team, Suwon 443370, South Korea
[3] Hankyong Natl Univ, Dept Elect Elect & Control Engn, Anseong 327, South Korea
[4] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
基金
美国国家科学基金会; 新加坡国家研究基金会;
关键词
Interference alignment; full-duplex; degrees of freedom; eigenvalue problem; EFFICIENCY;
D O I
10.1109/TCOMM.2017.2677946
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
This paper studies full-duplex (FD) cellular networks in which a base station (BS) operated in FD mode with multiple antennas supports multiple uplink and downlink users simultaneously in the same wireless channel. Two typical FD cellular scenarios are considered, one with half-duplex (HD) users and the other with FD users along with the FD BS. For both the cases, a novel constructive method is developed for finding a closed-form interference alignment (IA) solution, named cyclic IA. The core idea behind this approach is to construct a set of loop-equations enabling IA in a cyclic manner, so that beamforming vectors are sequentially determined by solving an eigenvalue problem. It is shown analytically that the proposed cyclic IA can achieve the optimal sum degreesof- freedom (DoF) when the number of user antennas is large enough to meet the derived conditions. In particular, it is shown that the proposed scheme achieves a twofold DoF gain compared with conventional HD cellular networks even in the presence of inter-link interference, provided the number of users becomes large enough compared with the ratio of the number of BSs and user antennas. Simulation results demonstrate that not only are the analytical DoF results valid, but under a practical multi-cell scenario, the proposed cyclic IA offers significant throughput gains depending on the cell radius.
引用
收藏
页码:2657 / 2671
页数:15
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