多小区多用户TDD MIMO下行链路干扰抑制预编码算法

doi:10.3969/j.issn.1000-436x.2013.04.023

Abstract

Abstract:

To suppress multi-user interference (MUI) and inter-cell interference (ICI) existing in multi-cell multi-user TDD MIMO downlink,an interference suppression algorithm through designing precoder was proposed.Firstly,a precoding matrix was designed for MUI suppression,with the help of the QR decomposition of generalized MMSE channel inversion.And then the second precoding matrix was designed to suppress ICI and residual MUI,using a signal leakage criterion.The proposed algorithm could utilize TDD MIMO channel reciprocity,and thus did not require users' feedback information.The algorithm had been simulated in a multi-user TDD MIMO system composed of urban micro-cells.Simulation results show that,the proposed algorithm can effectively improve system capacity and user's average SINR.

Key words: TDD MIMO, multi-user interference (MUI), inter-cell interference (ICI), interference suppression, downlink

Zu-jun LIU,Jie-ling WANG,De-chun SUN,Ke-chu YI. Linear precoding for interference suppression in multi-cell multi-user TDD MIMO downlink[J]. Journal on Communications, 2013, 34(4): 187-193.

Figures/Tables 11

算法	算法步骤	FLOP
本文算法	MMSE 信道逆	$\frac{4}{3} N_{T}^{3} + 2 K N_{R} N_{T}^{2} + N_{T}$
	第一个预编码矩阵 ${\bar{Q}}_{k}$	$2 K N_{R}^{2} (N_{T} - \frac{N_{R}}{3})$
	第一个预编码矩阵M_k	$K [14 N_{T}^{3} + 10 N_{T}^{2} N_{R} + (K M + K - 1) N_{T}^{2}]$
	总的FLOP	$\frac{4}{3} N_{T}^{3} + K [14 N_{T}^{3} + 12 N_{R} N_{T}^{2} + 2 N_{R}^{2} N_{T} - \frac{2 N_{R}^{3}}{3} (K M + K - 1) N_{T}^{2}]$
改进BD算法	计算B_k	$K [4 N_{T}^{2} (K - 1) N_{R} + 13 {((K - 1) N_{R})}^{3}]$
	计算预编码矩阵D_k	$K (17 N_{R}^{3} + N_{R}^{3} + N_{R})$
	计算接收滤波器W_k	$K [\frac{5 N_{R}^{3}}{3} + 10 N_{T}^{2} N_{R} + (K M + K - 1) N_{T}^{2}]$
	总的FLOP	$K [\frac{59 N_{R}^{3}}{3} + 13 {((K - 1) N_{R})}^{3} + (4 K + 6) N_{T}^{2} N_{R} + (K M + K - 1) N_{T}^{2} + N_{R}]$

References 20

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参数	本文算法	改进BD算法
N_R=2,N_T=4,K=2	3 114	1 118
N_R=2,N_T=6,K=3	14 240	9 022
N_R=2,N_T=8,K=4	42 645	30 045

Linear precoding for interference suppression in multi-cell multi-user TDD MIMO downlink

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