Aligned Interference Neutralization and the Degrees of Freedom of the 2 , x , 2 ,x , 2 Interference Channel

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...

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Bibliographic Details
Published in:IEEE transactions on information theory 2012-07, Vol.58 (7), p.4381
Main Authors: Gou, T, Jafar, S A, Wang, C, Jeon, S-W, Chung, S-Y
Format: Article
Language:English
Subjects:
Communication channels
Electric noise
Information theory
Wireless networks
Online Access:Get full text
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Summary: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. [PUBLICATION ABSTRACT]
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2012.2191388