Multiuser water-filling

Roger S. Cheng, Sergio Verdu

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

Abstract

We find the capacity region of a two-user Gaussian multiaccess channel with intersymbol interference (ISI) where the inputs pass through respective linear systems and are then superimposed before being corrupted by an additive Gaussian noise process. We give a novel geometrical method to obtain the optimal input power spectral densities and the capacity region. This method can be viewed as a nontrivial generalization of the single-user water-filling argument. We show that as in the traditional memoryless multiaccess channel, FDMA, with optimally selected frequency bands for each user, achieves the total capacity of the K-user Gaussian multiaccess channel with ISI. However, the capacity region of the two-user channel with memory is, in general, not a pentagon unless the channel transfer functions for both users are identical.

Original languageEnglish (US)
Title of host publicationProceedings of the 1993 IEEE International Symposium on Information Theory
PublisherPubl by IEEE
Number of pages1
ISBN (Print)0780308786
StatePublished - Jan 1 1993
Externally publishedYes
EventProceedings of the 1993 IEEE International Symposium on Information Theory - San Antonio, TX, USA
Duration: Jan 17 1993Jan 22 1993

Other

OtherProceedings of the 1993 IEEE International Symposium on Information Theory
CitySan Antonio, TX, USA
Period1/17/931/22/93

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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