Optimal spectrum management for the two-user Gaussian interference channel: Avoidance or cancellation?

Khalid Zeineddine, Michael L Honig, Shirish Nagaraj

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We study the continuous frequency spectrum management problem for the two-user Gaussian interference channel. We consider a successive interference cancellation scheme between the two receivers. In this model, receiver 1 decodes user 1 and passes the decoded bits to receiver 2 which in turn cancels the interference from user 1. We analytically determine the optimal power spectral density for users 1 and 2 for an asymmetric flat fading channel. We show when frequency division multiplexing (FDM) is optimal. We also show when frequency sharing with cancellation dominates FDM. Moreover we formulate the frequency selective case as a convex optimization problem. Both the sum power constraint and the individual power constraint are analyzed. As opposed to the linear case (no cancellation), only two pure spectrum allocation schemes are optimal when we have interference cancellation: either sharing or orthogonal. No mixed scheme is optimal. The two regions are determined by the channel conditions and are independent of the power constraints imposed. We also notice that the FDM region shrinks and the spectral efficiency increases as a result of introducing cancellation.

Original languageEnglish (US)
Title of host publication2014 52nd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages199-205
Number of pages7
ISBN (Electronic)9781479980093
DOIs
StatePublished - Jan 30 2014
Event2014 52nd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2014 - Monticello, United States
Duration: Sep 30 2014Oct 3 2014

Publication series

Name2014 52nd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2014

Other

Other2014 52nd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2014
CountryUnited States
CityMonticello
Period9/30/1410/3/14

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

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