Generalized Degrees of Freedom of the Symmetric Gaussian K User Interference Channel

We characterize the generalized degrees of freedom of the K user symmetric Gaussian interference channel where all desired links have the same signal-to-noise ratio (SNR) and all undesired links carrying interference have the same interference-to-noise ratio, INR = SNR α . We find that the number of...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on information theory 2010-07, Vol.56 (7), p.3297-3303
Main Authors: Jafar, Syed A, Vishwanath, Sriram
Format: Article
Language:English
Subjects:
AWGN
Channels
Decoding
Degrees of freedom
Deterministic model
Frequency
Gaussian
generalized degrees of freedom
Interference
interference alignment
interference channel
Interference channels
Lattices
Links
Mathematical analysis
Messages
Multilevel
Receiving antennas
Signal mapping
Signal to noise ratio
strong interference
weak interference
Wireless networks
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We characterize the generalized degrees of freedom of the K user symmetric Gaussian interference channel where all desired links have the same signal-to-noise ratio (SNR) and all undesired links carrying interference have the same interference-to-noise ratio, INR = SNR α . We find that the number of generalized degrees of freedom per user, d(α), does not depend on the number of users, so that the characterization is identical to the 2 user interference channel with the exception of a singularity at α = 1 where d(1) = 1/K. The achievable schemes use multilevel coding with a nested lattice structure that opens the possibility that the sum of interfering signals can be decoded at a receiver even though the messages carried by the interfering signals are not decodable.
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2010.2048494