Aligned Interference Neutralization and the Degrees of Freedom of the 2x2x2 Interference Channel

Details Aligned Interference Neutralization and the Degrees of Freedom of the 2x2x2 Interference Channel Aligned Interference Neutralization and the Degrees of Freedom of the 2x2x2 Interference Channel

2010-12-10

arxiv.org/abs/1012.2350v1

Computer Science

Information Theory

Scientific paper

We show that the 2x2x2 interference channel, i.e., the multihop interference channel formed by concatenation of two 2-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 cancelled over the air at the last hop.

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