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

摘要/Abstract

摘要：

针对大规模多输入多输出系统由于导频序列数的限制以及用户间干扰造成的导频污染问题，提出了分组导频复用策略对导频序列进行重新分配。根据小区内用户受干扰的严重程度，通过两次分组将用户分为中心用户组和边缘用户组，为边缘用户分配完全正交的导频序列；并重点针对边缘用户提出了导频开销优化策略，寻找兼顾考虑导频污染抑制和导频开销问题的最优导频分配方案。仿真结果表明，本文方法可以有效抑制导频污染，提升系统性能。

关键词: 通信技术, 大规模多输入多输出系统, 导频污染, 用户干扰, 分组导频复用, 导频开销

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

中图分类号:

TN929.5

李建坡,薛鹏,杨涛,李美霖. 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[J]. 吉林大学学报(工学版), 2021, 51(6): 2225-2236.

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.

图/表 13

图1

图2

图3

图4

图5

表1

系统仿真参数"

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

表1

图6

图7

图8

图9

图10

图11

表2

算法复杂度分析"

算法

时间复杂度

SPRS

FPRS

WGCPA

DPRS-1st

DPRS-2nd

$O n$

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

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

表2

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