大规模MIMO系统中基于图着色的半动态导频分配

doi:10.11959/j.issn.1000-0801.2020184

Abstract

Abstract:

To alleviate the performance loss caused by pilot contamination in massive multiple-input multiple-output (MIMO) systems,a semi-dynamic pilot allocation scheme based on graph coloring was proposed.Firstly,a pilot reuse threshold was derived for users.Then,based on the pilot reuse threshold,users of each cell are divided into cell-center users and cell-edge users,where cell-center users were allowed to reuse the same pilot.Finally,based on the graph coloring theory,the pilot resources were allocated to cell-edge users with serious pilot interference by multi-cell coordination.The simulation results show that the proposed pilot allocation scheme reduces the pilot interference and improves the uplink achievable rate of the whole system effectively.

Key words: massive MIMO, pilot contamination, graph coloring, total achievable rate

CLC Number:

TN929.5

Fangmin XU,Hui QIAN,Haiyan CAO. Semi-dynamic pilot allocation based on graph coloring in massive MIMO systems[J]. Telecommunications Science, 2020, 36(11): 39-46.

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References 16

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参数	数值
小区数L	3
基站天线数目M	50～400
小区用户数K	4
小区半径R/m	500
路径损耗因子α	3.8
对数阴影衰落/dB	8
导频数目	9，11，13]
导频发射功率/dB	-30,30]
用户发射功率/dB	30

Semi-dynamic pilot allocation based on graph coloring in massive MIMO systems

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