Partial Interference Alignment Scheme for Three-Tier Downlink Heterogeneous Networks
Partial Interference Alignment Scheme for Three-Tier Downlink Heterogeneous Networks
复制标题
三层下行异构网络的部分干扰对齐方案
DOI：
10.1109/access.2020.3015779
复制
发表时间：
2020-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhang, Yucheng
中科院分区：
文献类型：
--
作者：
Li, Shibao;Guo, Lin;Zhang, Yucheng
在异构网络（HetNets）中引入中继可以增强蜂窝边缘信号，但也会带来由共层、跨层和跨时隙（由中继的半双工模式引起）干扰组成的多重干扰共存，导致现有的干扰对齐（IA）方案无效。为了解决上述问题，本文提出了部分IA方案，通过合理设计干扰的阶数和消除干扰的方法，在天线有限的情况下实现IA。首先，我们将来自其他基站的干扰对准到微型基站产生的干扰空间中，降低中继的干扰维数，然后通过零空间和串联预编码方案解决基站与用户之间的干扰。进一步分析了天线配置的可行性条件。仿真结果表明，所提方案在求和速率上优于传统的IA方案，并且随着中继传输功率的增加，所提方案的性能进一步提高。
The introduction of the relay in heterogeneous networks (HetNets) can enhance cell-edge signals, but it will also bring coexistence of multiple interference which is composed of co-tier, cross-tier and cross time slot (caused by the half-duplex mode of the relay) interference, resulting in the ineffectiveness of the existing interference alignment (IA) schemes. To solve the above problem, the partial IA scheme, which achieves IA in the case of limited antennas by rationally designing the order and method of eliminating interference, is proposed in this paper. First, we align the interference from other base stations (BSs) into the interference space generated by pico BS to reduce the interference dimension of the relay, and then solve the interference between BSs and users by null space and concatenated precoding schemes. Furthermore, the feasibility condition of antenna configuration is analyzed. The simulation results show that the proposed scheme is superior to the traditional IA scheme in sum rate, and the performance of the proposed scheme is further improved as the relay transmission power increases.