  A constant K-user interference channel in which the users are not
symbol-synchronous is considered. It is shown that the asynchronism among the
users facilitates aligning interfering signals at each receiver node while it
does not affect the total number of degrees of freedom (DoF) of the channel. To
achieve the total K/2 DoF of the channel when single antenna nodes are used, a
novel practical interference alignment scheme is proposed wherein the alignment
task is performed with the help of asynchronous delays which inherently exist
among the received signals at each receiver node. When each node is equipped
with M > 1 antennas, it is argued that the same alignment scheme is sufficient
to achieve the total MK/2 DoF of the medium when all links between collocated
antennas experience the same asynchronous delay.
