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Since Maddah-Ali and Tse showed that the completely stale transmitter-sidechannel state information (CSIT) still benefits the Degrees of Freedom (DoF) ofthe Multiple-Input-Multiple-Output (MISO) Broadcast Channel (BC), there hasbeen much interest in the academic literature to investigate the impact ofimperfect CSIT on \emph{DoF} region of time correlated broadcast channel. Eventhough the research focus has been on time correlated channels so far, asimilar but different problem concerns the frequency correlated channels.Indeed, the imperfect CSIT also impacts the DoF region of frequency correlatedchannels, as exemplified by current multi-carrier wireless systems.  This contribution, for the first time in the literature, investigates ageneral frequency correlated setting where a two-antenna transmitter hasimperfect knowledge of CSI of two single-antenna users on two adjacentsubbands. A new scheme is derived as an integration of Zero-Forcing Beamforming(ZFBF) and the scheme proposed by Maddah-Ali and Tse. The achievable DoF regionresulted by this scheme is expressed as a function of the qualities of CSIT.

Imperfect and Unmatched CSIT is Still Useful for the Frequency Correlated MISO Broadcast Channel