Aligned interference neutralization and the degrees of freedom of the 2×2×2 interference channel with interfering relays

Author

Gou, Tiangao ; Wang, Chenwei ; Jafar, Syed A.

Author_Institution

Center for Pervasive Commun. & Comput., Univ. of California, Irvine, Irvine, CA, USA

fYear

2011

fDate

28-30 Sept. 2011

Firstpage

1041

Lastpage

1047

Abstract

Previous work showed that the 2×2×2 interference channel, i.e., the multihop interference network formed by concatenation of two 2-user interference channels, achieves the min-cut outer bound value of 2 DoF. This work studies the 2×2×2 interference channel with one additional assumption that two relays interfere with each other. It is shown that even in the presence of the interfering links between two relays, the min-cut outer bound of 2 DoF can still be achieved for almost all values of channel coefficients, for both fixed or time-varying channel coefficients. The achievable scheme relies on the idea of aligned interference neutralization as well as exploiting memory at source and relay nodes.

Keywords

radiofrequency interference; wireless channels; 2-user interference channels; DoF; aligned interference neutralization; degree of freedom; fixed channel coefficients; interfering links; interfering relays; min-cut outer bound; multihop interference network; time-varying channel coefficients; Array signal processing; Integrated circuits; Interference channels; Relays; Spread spectrum communication; Unicast;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication, Control, and Computing (Allerton), 2011 49th Annual Allerton Conference on

Conference_Location

Monticello, IL

Print_ISBN

978-1-4577-1817-5

Type

conf

DOI

10.1109/Allerton.2011.6120282

Filename

6120282