IEEE Transactions on Information Theory, September 2013, Volume 60, N°1, ISSN: 0018-9448
We consider the temporally-correlated Multiple-Input Multiple-Output (MIMO) broadcast channels (BC) and interference channels (IC) where the transmitter(s) has/have (i) delayed channel state information (CSI) obtained from a latency-prone feedback channel as well as (ii) imperfect current CSIT, obtained, e.g., from prediction on the basis of these past channel samples based on the temporal correlation. The degrees of freedom (DoF) regions for
the two-user broadcast and interference MIMO networks with general antenna conﬁguration under such conditions are fully characterized, as a function of the prediction quality indicator. Speciﬁcally, a simple uniﬁed framework is proposed, allowing to attain optimal DoF region for the general antenna conﬁgurations and current CSIT qualities. Such a framework builds upon block-Markov encoding with interference quantization, optimally combining the use of
both outdated and instantaneous CSIT. A striking feature of our work is that, by varying the power allocation, every point in the DoF region can be achieved with one single scheme. As a result, instead of checking the achievability of every corner point of the outer bound region, as typically done in the literature, we propose a new systematic way to prove the achievability.
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