基于分组导频复用的大规模多输入多输出系统导频污染抑制方法

doi:10.13229/j.cnki.jdxbgxb20200666

Abstract

Abstract:

Massive Multiple-input Multiple-output (MIMO) systems may cause serious problems named pilot contamination due to the limitation of the number of pilot sequences and interference of users. which will result in the reduction of the system performance. In order to suppress pilot contamination, a Divided Pilot Reuse Strategy (DPRS) is proposed to redistribute the pilot sequences. The pilot sequences are divided into central user groups and edge user groups according to the degree of user interference in the cell, and the fully orthogonal pilot sequences are allocated for edge users. In addition, a pilot overhead optimization strategy is proposed for edge users, analyzing the pilot overhead of the system, and seeking the optimal solution of both pilot contamination suppression and pilot overhead. Theoretical analysis and simulation results show that the proposed method can suppress pilot contamination and improve system performance.

Key words: communication technology, massive multiple-input multiple-output systems, pilot contamination, interference of users, divided pilot reuse, pilot overhead

CLC Number:

TN929.5

Jian-po LI,Peng XUE,Tao YANG,Mei-lin LI. Pilot contamination suppression method for massive MIMO system based on divided pilot reuse[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 2225-2236.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Table 1

System simulation parameters"

参数

取值

小区数 $L$

基站端天线数 $M$

小区内用户数 $K$

分组参数 $δ$

小区半径 $R$ /m

初始导频开销系数 $μ 0$

上行发送功率/dB

下行发送功率/dB

传输带宽/MHz

路径损耗指数 $α$

阴影衰落 $σ s h a d o w$

$16 ≤ M ≤ 512$

$0.1 ≤ δ ≤ 1.0$

1000

0.1

2~20

3.8

Table 1

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Table 2

Algorithm complexity analysis"

算法

时间复杂度

SPRS

FPRS

WGCPA

DPRS-1st

DPRS-2nd

$O n$

$O n 2 + O n$ $O n 5 + O n 4 + O n 2 + O n$ $O n 2 + O n$

$O n 3 + O n 2 + O n$

Table 2

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Pilot contamination suppression method for massive MIMO system based on divided pilot reuse

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