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This contribution investigates the Degrees-of-Freedom region of a two-userfrequency correlated Multiple-Input-Single-Output (MISO) Broadcast Channel (BC)with imperfect Channel State Information at the transmitter (CSIT). We assumethat the system consists of an arbitrary number of subbands, denoted as $L$.Besides, the CSIT state varies across users and subbands. A tight outer-boundis found as a function of the minimum average CSIT quality between the twousers. Based on the CSIT states across the subbands, the DoF region isinterpreted as a weighted sum of the optimal DoF regions in the scenarios wherethe CSIT of both users are perfect, alternatively perfect and not known.Inspired by the weighted-sum interpretation and identifying the benefit of theoptimal scheme for the unmatched CSIT proposed by Chen et al., we also design ascheme achieving the upper-bound for the general $L$-subband scenario infrequency domain BC, thus showing the optimality of the DoF region.

Degrees-of-Freedom Region of MISO-OFDMA Broadcast Channel with Imperfect CSIT