基于图着色的大规模MIMO系统中动态导频分配

doi:10.11772/j.issn.1001-9081.2017.12.3356

计算机应用 ›› 2017, Vol. 37 ›› Issue (12): 3356-3360.DOI: 10.11772/j.issn.1001-9081.2017.12.3356

基于图着色的大规模MIMO系统中动态导频分配

樊自甫, 胡敏, 李悦宁

重庆邮电大学下一代网络应用技术研究所, 重庆 400065

收稿日期:2017-06-30 修回日期:2017-09-02 发布日期:2017-12-18 出版日期:2017-12-10
通讯作者: 胡敏
作者简介:樊自甫(1977-),男,安徽舒城人,副教授,硕士,主要研究方向:下一代网络技术、管理决策;胡敏(1992-),女,湖北潜江人,硕士研究生,主要研究方向:大规模多输入多输出;李悦宁(1991-),男,重庆人,硕士研究生,主要研究方向:能量采集。
基金资助:
国家自然科学基金资助项目（11502039）；重庆市教委科学技术研究项目（KJ1600424）；重庆邮电大学博士科研启动基金资助项目（A2015-41）；重庆邮电大学青年科学基金资助项目（A2015-62）。

Dynamic pilot allocation based on graph coloring in massive MIMO systems

FAN Zifu, HU Min, LI Yuening

Institute of Next Generation Network and Application Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2017-06-30 Revised:2017-09-02 Online:2017-12-18 Published:2017-12-10
Supported by:
This work is partially supported by the National Natural Science Foundation of China (11502039), the Science and Technology Research Project of Chongqing Municipal Education Commission (KJ1600424), the Doctoral Scientific Research Foundation of Chongqing University of Posts and Telecommunications (A2015-41), the Youth Science Foundation of Chongqing University of Posts and Telecommunications (A2015-62).

摘要/Abstract

摘要： 针对大规模多输入多输出（MIMO）系统中存在的导频污染问题，提出一种基于图着色的动态导频分配方案。为了更加合理地分配导频、减小导频污染，首先，利用小区间协作，将不同小区的用户通过带权值的边相连来构建边权值干扰图，以此来描述多小区用户间的导频污染程度；然后，在传统的图着色理论基础上，利用相连用户边权值不同的特点，优先为受导频污染严重的用户分配导频资源。理论分析和仿真结果表明，所提的导频分配方案不同于现有的分布式导频分配方案，在考虑所有小区导频复用的情况下，基于图着色集中式地分配导频，能够减小小区间用户的干扰，提升大规模MIMO系统的上行可达和速率。

关键词: 大规模多输入多输出, 导频污染, 导频分配, 图着色, 可达和速率

Abstract: Aiming at the pilot contamination problem in massive Multiple-Input Multiple-Out (MIMO) systems, a dynamic pilot allocation scheme based on graph coloring was proposed. To allocate pilot more reasonably and mitigate pilot contamination, firstly, an edge-weighted interference graph based on cooperation among cells was constructed to describe the strength of pilot contamination among multi-cell users, whereby two users in different cells were connected by a weighted edge. Then, based on the traditional graph coloring theory, pilot resources were allocated preferentially to users who were heavily polluted by the characteristics of different weighted edge for connected users. The theoretical analysis and simulation results show that, compared with existing distributed pilot allocation scheme, the proposed pilot allocation scheme can reduce the inter-cell interference and enhance the uplink achievable sum rate by considering pilot reuse of all cells and centralized pilot allocation mechanism based on graph coloring.

Key words: Massive Multiple-Input Multiple-Output (MIMO), pilot contamination, pilot allocation, graph coloring, achievable sum rate

中图分类号:

TN929.5

樊自甫, 胡敏, 李悦宁. 基于图着色的大规模MIMO系统中动态导频分配[J]. 计算机应用, 2017, 37(12): 3356-3360.

FAN Zifu, HU Min, LI Yuening. Dynamic pilot allocation based on graph coloring in massive MIMO systems[J]. Journal of Computer Applications, 2017, 37(12): 3356-3360.

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基于图着色的大规模MIMO系统中动态导频分配

Dynamic pilot allocation based on graph coloring in massive MIMO systems

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