《计算机应用研究》|Application Research of Computers

大规模MIMO系统中基于用户位置的导频分配

Pilot allocation based on user location in massive MIMO systems

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作者 张进彦,金凤,尹礼欣,马东亚
机构 重庆邮电大学 移动通信重庆市重点实验室,重庆 400065
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文章编号 1001-3695(2019)06-051-1844-05
DOI 10.19734/j.issn.1001-3695.2018.01.0012
摘要 大规模多输入、多输出(multiple input multiple output,MIMO)系统中因导频复用而存在的导频污染问题,成为性能提高的瓶颈。针对此问题,提出一种基于用户位置的导频分配方案。该方案通过上行功率控制方法保证不同用户到各自小区基站的信号功率相同,并在功率控制情况下根据干扰用户到本小区基站距离与到目标小区基站距离的比值来定义干扰用户对目标用户的导频污染强度,并给用户间导频污染强度较小的两个不同小区用户分配相同的导频。仿真结果表明,所提方案能够有效提高系统容量,减小用户间性能差距,较好地降低了用户间的导频污染。
关键词 大规模多输入、多输出; 导频污染; 功率控制; 用户位置; 导频分配
基金项目 长江学者和创新团队发展计划资助项目(IRT_16R72)
本文URL http://www.arocmag.com/article/01-2019-06-051.html
英文标题 Pilot allocation based on user location in massive MIMO systems
作者英文名 Zhang Jinyan, Jin Feng, Yin Lixin, Ma Dongya
机构英文名 Chongqing Key Lab of Mobile Communication Technology,Chongqing University of Posts & Telecommunications,Chongqing 400065,China
英文摘要 The problem of pilot contamination caused by pilot multiplexing has become a bottleneck for its performance improvement in massive MIMO systems. To solve this problem, this paper proposed a pilot allocation scheme based on user location. In this scheme, the uplink power control method ensured that signal power of different users to the base station of their own cell were equal. In the case of power control, it defined the pilot contamination intensity of the interfering users to the target user as the ratio of the distance from the interfering user to the base station of interference cell to the distance of target cell. It allocated the same pilot to two users of different cell with less pilot contamination between users. The simulation results show that the proposed scheme can effectively improve the system capacity, reduces the performance gap between users and reduce the pilot contamination between users.
英文关键词 massive multiple input multiple output; pilot contamination; power control; user location; pilot allocation
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收稿日期 2018/1/20
修回日期 2018/3/9
页码 1844-1848
中图分类号 TN929.5
文献标志码 A