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This paper considers a K-user Multiple-Input-Single-Output (MISO)Interference Channel (IC), where the channel state information obtained by thetransmitters (CSIT) is perfect, but completely outdated. A RetrospectiveInterference Alignment (RIA) using such delayed CSIT was proposed by theauthors of [1] for the MISO Broadcast Channel (BC), but the extension to theMISO IC is a non-trivial step as each transmitter only has the message intendedfor the corresponding user. Recently, [7] focused on aSingle-Input-Single-Output (SISO) IC and solved such bottleneck by inventing adistributed higher order symbol generation. Our main work is to extend [7] tothe MISO case by integrating some features of the scheme proposed in [1]. Theachieved sum Degrees-of-Freedom (DoF) performance is asymptotically given by64/15 when $K\to\infty$, outperforming all the previously known results.

Degrees-of-Freedom of the K-User MISO Interference Channel with Delayed Local CSIT