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In the setting of the two-user (M;N) Multiple-Input Multiple-Output (MIMO) Broadcast Channel (BC), recent work by Maddah-Ali and Tse, and Vaze and Varanasi have revealed the usefulness of delayed Channel State Information at the Transmitter (perfect delayed CSIT). The authors' work studies the general case of communicating with imperfect delayed CSIT, and proceeds to present novel precoding schemes and Degrees-of-Freedom (DoF) bounds that are often tight, and to constructively reveal that even substantially imperfect delayed-CSIT, is in fact sufficient to achieve the optimal DoF performance previously associated to perfect delayed CSIT.
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