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In this paper, the degrees of freedom (DoF) of the two-user single inputsingle output (SISO) X-channel are investigated. Three cases are considered forthe availability of channel state information at the transmitters (CSIT);perfect, delayed, and no-CSIT. A new achievable scheme is proposed to elucidatethe potency of interference creation-resurrection (IRC) when the available CSITalternates between these three cases. For some patterns of alternating CSIT,the proposed scheme achieves $4/3$ DoF, and hence, coincides with theinformation theoretic upper bound on the DoF of the two-user X-channel withperfect and instantaneous CSIT. The CSIT alternation patterns are investigatedwhere the patterns that provide extraordinary synergistic gain and dissociativeones are identified.

A DoF-Optimal Scheme for the two-user X-channel with Synergistic Alternating CSIT