DoF Analysis of the MIMO X Network with Distributed Hybrid CSIT

FENG Wen-jiang; YING Teng-da; DAI Cai-li; JIANG Wei-heng; LIU Guo-ling; ZHONG Xin-hui; YAO Chu-nan

doi:10.3969/j.issn.0372-2112.2018.07.003

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DoF Analysis of the MIMO X Network with Distributed Hybrid CSIT

更新时间：2025-07-16

- DoF Analysis of the MIMO X Network with Distributed Hybrid CSIT
- Acta Electronica Sinica Vol. 46, Issue 7, Pages: 1553-1561(2018)
- 作者机构：
  
  1. 重庆大学通信工程学院,重庆,400044
  2. 重庆电子工程职业学院通信工程学院,重庆,401331
  3. 重庆大学通信工程学院,重庆,400044
  4. 重庆电子工程职业学院通信工程学院,重庆,401331
- 作者简介：
- 基金信息：
  
  Fundamental Research Funds for the Central Universities (No.106112016CDJXY500002);Key Project of Chongqing Research Program of Basic Science and Frontier Technology (No.cstc2017jcyjBX0047, No.cstc2015jcyjA40021)
- DOI：10.3969/j.issn.0372-2112.2018.07.003
  CLC： TN919.1
- Published Online：25 July 2018，
  
  Published：2018
- 稿件说明：
移动端阅览
FENG Wen-jiang, YING Teng-da, DAI Cai-li, et al. DoF Analysis of the MIMO X Network with Distributed Hybrid CSIT[J]. Acta Electronica Sinica, 2018, 46(7): 1553-1561.
DOI：

FENG Wen-jiang, YING Teng-da, DAI Cai-li, et al. DoF Analysis of the MIMO X Network with Distributed Hybrid CSIT[J]. Acta Electronica Sinica, 2018, 46(7): 1553-1561. DOI： 10.3969/j.issn.0372-2112.2018.07.003.

摘要

在

用户MIMO X网络中，发射端信道状态信息（CSIT）类型会影响系统总自由度（sum-DoF）.为逼近系统总自由度外界，设计MIMO X网络对称天线配置下的多阶段分布式空时干扰对齐（DSTIA）方案；推导具有分布式特性的基于混合CSIT过期（outdated）和当前（current） CSIT的预编码矩阵闭式解；分析CSI反馈时延、网络节点数和配置天线数对MIMO X网络总自由度的影响.理论和数值分析表明，在分布式混合CSIT条件下，DSTIA方案能充分消除用户间干扰，获得更高的自由度，缩小可达界与外界的差距，提高系统可达速率.

Abstract

In the context of

user multiple-input multiple-output (MIMO) X network

the different types of channel state information at the transmitters (CSIT) have impacts on the sum of degrees of freedom (sum-DoF).To approximate to the sum-DoF outer bounds

we propose a multiphase distributed space-time interference alignment (DSTIA) scheme for the MIMO X network with symmetric antenna configurations.We derive the closed-form solution of precoding matrix based on hybrid CSIT (i.e.

outdated and current CSIT) with distributed characteristics

while revealing the impact on how the CSI feedback delay

as well as the number of transmitters/receivers and the number of antennas affect the sum-DoF of the MIMO X network.Theore

tical and Analytical results show that

with distributed hybrid CSIT

DSTIA scheme can achieve better sum-DoFs by eliminating inter-user interference perfectly

as well as tightening DoF gap and improving the achievable rates of system.

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