Replica analysis of large-system CDMA

D. Guo, Sergio Verdu

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

12 Scopus citations


We present some new results on large-system CDMA obtained through the replica method developed in statistical physics. We find the spectral efficiency of randomly spread CDMA subject to Gaussian noise and flat fading in the large-system limit under arbitrary input distributions. Both joint decoding and single-user decoding are considered. In the latter case, a conditional mean estimator is first applied to separate the users and it is found that the resulting single-user channel for every user is equivalent to a Gaussian channel. The multiuser efficiency of that Gaussian channel is the same for all users and satisfies a fixed-point equilibrium equation. The additive decomposition by Shamai-Verdu of optimum capacity in terms of single-user capacity is shown to hold for arbitrary input distributions.

Original languageEnglish (US)
Title of host publicationProceedings - 2003 IEEE Information Theory Workshop, ITW 2003
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780377990, 9780780377998
StatePublished - Jan 1 2003
Event2003 IEEE Information Theory Workshop, ITW 2003 - Paris, France
Duration: Mar 31 2003Apr 4 2003

Publication series

NameProceedings - 2003 IEEE Information Theory Workshop, ITW 2003


Other2003 IEEE Information Theory Workshop, ITW 2003

All Science Journal Classification (ASJC) codes

  • Computational Theory and Mathematics
  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering


Dive into the research topics of 'Replica analysis of large-system CDMA'. Together they form a unique fingerprint.

Cite this