Two-hop interference channels: Impact of linear time-varying schemes

Author

Issa, I. ; Fong, Silas L. ; Avestimehr, Amir Salman

Author_Institution

Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA

fYear

2013

fDate

7-12 July 2013

Firstpage

2309

Lastpage

2313

Abstract

We consider the two-hop interference channel (IC) with constant real channel coefficients, which consists of two source-destination pairs, separated by two relays. We analyze the achievable degrees of freedom (DoF) of such network when relays are restricted to perform scalar amplify-forward (AF) operations, with possibly time-varying coefficients. We show that, somewhat surprisingly, by providing the flexibility of choosing time-varying AF coefficients at the relays, it is possible to achieve 4/3 sum-DoF. We also develop a novel outer bound that matches our achievability, hence characterizing the sum-DoF of two-hop interference channels with time-varying AF relaying strategies.

Keywords

amplify and forward communication; interference (signal); time-varying channels; DoF; amplify-forward operations; degrees of freedom; linear time-varying schemes; source-destination pairs; two-hop interference channels; Equations; Information theory; Integrated circuits; Interference channels; Noise; Relays;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Theory Proceedings (ISIT), 2013 IEEE International Symposium on

Conference_Location

Istanbul

ISSN

2157-8095

Type

conf

DOI

10.1109/ISIT.2013.6620638

Filename

6620638