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Degrees of freedom of multiple-antenna interference channel with general CSIT

We consider the two-user time correlated multiple-antenna interference channel (IC) under realistic conditions. Specifically, the transmitters have not only perfect delayed channel state information (CSIT), but also asymmetrically imperfect current CSIT. Delayed CSIT, met to cases of practical interest (certain feedback latency and limited quality), can still be useful as shown by Maddah-Ali and Tse. In parallel, the assumption of unequal prediction of current CSIT based on past samples across different links, conduces to the consideration of a more realistic scenario, where different links face different Doppler spread. The degrees of freedom (DoF) region of the IC under these general conditions is obtained and characterized. In particular, we investigate the effects of the asymmetry appearing to different links, such as how the feedback capability of one user affects the other. In addition, the achievability schemes are provided. Finally, Monte Carlo simulation in terms of the sum rate validates the theoretical results and provides deeper insight.