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Due to limited backhaul/feedback link capacity and channel state information(CSI) feedback delay, obtaining global and instantaneous channel stateinformation at the transmitter (CSIT) is a main obstacle in practice. In thispaper, novel transmission schemes are proposed for a class of interferencenetworks that can achieve new trade-off regions between the sum of degrees offreedom (sum-DoF) and CSI feedback delay with distributed andtemperately-delayed CSIT. More specifically, a distributed space-timeinterference alignment (STIA) scheme is proposed for the two-usermultiple-input multiple-output (MIMO) X channel via a novel precoding methodcalled Cyclic Zero-padding. The achieved sum-DoFs herein for certain antennaconfigurations are greater than the best known sum-DoFs in literature withdelayed CSIT. Furthermore, we propose a distributed retrospective interferencealignment (RIA) scheme that achieves more than 1 sum-DoF for the K-usersingle-input single-output (SISO) X network. Finally, we extend the distributedSTIA to the MxN user multiple-input single-output (MISO) X network where eachtransmitter has N-1 antennas and each receiver has a single antenna, yieldingthe same sum-DoF as that in the global and instantaneous CSIT case. Thediscussion and the result of the MISO X network can be extended to the MIMOcase due to spatial scale invariance property.

On the Degrees of Freedom of MIMO X Networks with Non-Cooperation Transmitters