Abstract
This paper discusses inner bound and outer bound for the total number of spatial degrees of freedom (DoF) of the K-user MIMO interference channel with only local channel state information at each transmitter when channel extensions are disabled over time and frequency dimensions. We firstly provide a constructive proof of the achievability of the DoF based on zero forcing for two-user MIMO interference channel with \(M_{1},M_{2}\) antennas at transmitter 1, 2 and \(N_{1},N_{2}\) antennas at the corresponding receivers when only local channel state information (CSI) is available at the transmitters. Then the total achievable DoF and interference management scheme for 3-user interference channel with specific antenna configuration is presented by comparing the number of equations and the number of variables. We apply interference zero-forcing scheme and signal subspace analysis on the generalization of the interference management for this special case to the common 3-user and K-user MIMO symmetric interference channel and establish that the the inner bound on total spatial DoF \(\min ({K\min (M_{t}, N_{r}), \max (M_{t}, N_{r})})\) is achievable in K-user MIMO symmetric interference channel with \(M_{t}\) transmitter antennas and \(N_{r}\) receiver antennas. We also provide the proof of an outer bound on spatial DoF for the K-user MIMO symmetric interference channel with only local CSI at each transmitter and indicate that the inner bound and outer bound are tight when the number of receiver antennas is not less than the number of transmitter antennas.
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This work was supported in part by the Key Project of National Natural Science Foundation of China under grant 61231007, the National Science and Technology Major Project of the Ministry of Science and Technology of China under grant 2011ZX03003-001-04 and 2013ZX03003015-005, the National High Technology Research and Development Program of China (863 Program) under grant 2012AA121604 and 2014AA01A702, the Fundamental Research Funds for the Central Universities under grant 2042014kf0041, the International Science and Technology Cooperation Program of China under grant 2012DFG12010. Zhengmin Kong should be considered co-corresponding author.
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Peng, S., Liu, Y., Kong, Z. et al. Spatial Degrees of Freedom for MIMO Interference Channel with Local Channel State Information at Transmitters. Wireless Pers Commun 89, 639–662 (2016). https://doi.org/10.1007/s11277-016-3300-2
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DOI: https://doi.org/10.1007/s11277-016-3300-2