Aligned Interference Neutralization and the Degrees of Freedom of the 2<formula formulatype="inline"> <img src="/images/tex/16406.gif" alt=",\times ,"> </formula>2<formula formulatype="inline"> <img src="/images/tex/16406.gif" alt=",\times ,"> </formula>2
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We show that the 2$,times ,$2$,times ,$2 interference network, i.e., the multihop interference network formed by concatenation of two two-user interference channels achieves the min-cut outer bound value of 2 DoF, for almost all values of channel coefficients, for both time-varying or fixed-channel coefficients. The key to this result is a new idea, called aligned interference neutralization, that provides a way to align interference terms over each hop in a manner that allows them to be canceled over the air at the last hop.
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