基于分布式部分连接结构的多用户大规模MIMO混合预编码

doi:10.11959/j.issn.1000-436x.2022008

Abstract

Abstract:

For multiuser massive multiple-input multiple-output (MIMO) systems, to solve the problem of underutilized spatial resources caused by centralized partially-connected structure (PCS) and fixed-matching phase-control algorithm in conventional schemes, a low complexity phased zero-forcing (PZF) hybrid precoding scheme based on distributed PCS was proposed.The logical antenna subarrays with more than the number of radio frequency (RF) chains were designed, so that each RF chain could be connected to multiple distributed subarrays to provide higher spatial diversity gain.Further, by analyzing the influence of phase-control analog precoding on zero-forcing digital precoding, a phase-control analog precoding algorithm via successively maximizing users’ total subarray gains was proposed to maximize the upper bound of system spectral efficiency.Analysis and simulation results show that, compared with the conventional schemes, the proposed scheme can significantly improve the system spectral efficiency while slightly increases the computational complexity, and it is also insensitive to imperfect channel state information.

Key words: massive MIMO, hybrid precoding, partially-connected structure, phase-control analog precoding, subarray gain

CLC Number:

TN929.5

Lei ZHANG, Qin WANG. Hybrid precoding based on distributed partially-connected structure for multiuser massive MIMO[J]. Journal on Communications, 2022, 43(1): 104-116.

Figures/Tables 9

特点及计算复杂度	传统方案1	传统方案2	所提方案
特点	结构：集中式部分连接，单用户模拟预编码：固定相控	结构：集中式部分连接，多用户模拟预编码：固定相控	结构：分布式部分连接，多用户模拟预编码：算法1
	数字预编码：奇异值分解	数字预编码：迫零	数字预编码：迫零
求解模拟预编码	—	—	$O ((K (M - D) (N_{RF} - K / 2) + D N_{RF}^{2} lb D / 2) / 2)$
			次复数加法
求解等效信道矩阵	$O (M K N_{RF})$ 次复数乘法	$O (M K N_{RF})$ 次复数乘法	$O (M K N_{RF})$ 次复数乘法
求解数字预编码	$O (K^{2} N_{RF} + K N_{RF}^{2})$ 次复数乘法	$O (K^{2} N_{RF})$ 次复数乘法	$O (K^{2} N_{RF})$ 次复数乘法
总计算复杂度	$O (M K N_{RF} + K^{2} N_{RF} + K N_{RF}^{2})$ ) 次复	$O (M K N_{RF} + K^{2} N_{RF})$ 次复数乘法	$O (M K N_{RF} + K^{2} N_{RF})$ 次复数乘法+
	数乘法		$O ((K (M - D) (N_{RF} - K / 2) + D N_{RF}^{2} lb D / 2) / 2)$
			次复数加法
总计算复杂度（例）	$M K N_{RF} + K^{2} N_{RF} + K N_{RF}^{2} = 12 288$	$M K N_{RF} + K^{2} N_{RF} = 8 192$	$M K N_{RF} + K^{2} N_{RF} = 8 192$
N_TX=256, N_RF=K= 16			$\begin{array}{l} (K (M - D) (N_{RF} - K /2) + D N_{RF}^{2} lb D /2)/2 \\ = {\begin{cases} 1 024, D = 2 \\ 1 280, D = 4 \\ 2 048, D = 8 \\ 4 096, D = 16 \end{cases} \end{array}$

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