Interference Alignment and Degrees of Freedom of the -User Interference Channel

For the fully connected K user wireless interference channel where the channel coefficients are time-varying and are drawn from a continuous distribution, the sum capacity is characterized as C(SNR)=K/2log(SNR)+o(log(SNR)) . Thus, the K user time-varying interference channel almost surely has K/2 de...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on information theory 2008-01, Vol.54 (8)
Main Authors: Cadambe, V R, Jafar, SA
Format: Article
Language:English
Subjects:
Alignment
Channels
Degrees of freedom
Information theory
Interference
Mathematical analysis
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:For the fully connected K user wireless interference channel where the channel coefficients are time-varying and are drawn from a continuous distribution, the sum capacity is characterized as C(SNR)=K/2log(SNR)+o(log(SNR)) . Thus, the K user time-varying interference channel almost surely has K/2 degrees of freedom. Achievability is based on the idea of interference alignment. Examples are also provided of fully connected K user interference channels with constant (not time-varying) coefficients where the capacity is exactly achieved by interference alignment at all SNR values.
ISSN:0018-9448
DOI:10.1109/TIT.2008.926344