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Aligned Interference Neutralization and the Degrees of Freedom of the 2 ,\times , 2 ,\times , 2 Interference Channel

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5 Author(s)
Tiangao Gou ; Dept. of Electr. Eng. & Comput. Sci., Univ. of California Irvine, Irvine, CA, USA ; Jafar, S.A. ; Chenwei Wang ; Sang-Woon Jeon
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We show that the 2 × 2 × 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.

Published in:

Information Theory, IEEE Transactions on  (Volume:58 ,  Issue: 7 )

Date of Publication:

July 2012

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