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.
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.
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outdated and current CSIT) with distributed characteristics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.