This work studies the optimal Degrees-of-Freedom (DoF) of the -User MISO Broadcast Channel (BC) with delayed Channel-State Information at the Transmitter (CSIT) and with additional current noisy CSIT where the current channel estimation error scales in~ for . This papers establishes for the first time the optimal DoF in this setting thanks to a new transmission scheme which achieves the elusive DoF-optimal combining of the Maddah-Ali and Tse scheme (MAT) introduced in their seminal work in with Zero-Forcing (ZF) for an arbitrary number of users. The derived sum DoF takes the surprisingly simple form where is the sum-DoF achieved using solely MAT.
Optimal DoF of the K-User broadcast channel with delayed and imperfect current CSIT
IEEE Transaction on Information Theory, Parts of these results have been published in IEEE Information Theory Workshop 2016, Cambridge
Systèmes de Communication
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