Graph Coloring Based Pilot Allocation to Mitigate Pilot Contamination for Multi-Cell Massive MIMO Systems

被引：82
|
作者：
Zhu, Xudong [1 ]
Dai, Linglong [1 ]
Wang, Zhaocheng [1 ]
机构：
[1] Tsinghua Univ, Tsinghua Natl Lab Informat Sci & Technol TNList, Dept Elect Engn, Beijing 100084, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2015年 / 19卷 / 10期
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Massivemultiple-inputmultiple-output(MIMO); pilot contamination; graph coloring; pilot allocation;
D O I：
10.1109/LCOMM.2015.2471304
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
A massive multiple-input multiple-output (MIMO) system, which utilizes a large number of base station (BS) antennas to serve a set of users, suffers from pilot contamination due to the inter-cell interference (ICI). In this letter, a graph coloring based pilot allocation (GC-PA) scheme is proposed to mitigate pilot contamination for multi-cell massive MIMO systems. Specifically, by exploiting the large-scale characteristics of fading channels, an interference graph is firstly constructed to describe the potential ICI relationship of all users. Then, with the limited pilot resource, the proposed GC-PA scheme aims to mitigate the potential ICI by efficiently allocating pilots among users in the interference graph. The performance gain of the proposed scheme is verified by simulations.
引用
收藏
页码：1842 / 1845
页数：4
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