Performance of multicarrier and multirate CDMA: Some decoupling results

Dongning Guo*

*Corresponding author for this work

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

Abstract

It has been shown that a CDMA fading channel followed by a generic multiuser detection front end essentially decouples into a bank of Gaussian single-user channels in the large-system limit. This paper extends the decoupling result to multicarrier (MC) CDMA and multirate CDMA. In MC-CDMA, frequency-selective fading and equal-rate users are considered. In multirate CDMA, flat fading is assumed, while users may employ a combination of adaptive modulation, variable spreading factor, and multicode schemes to support different data rates. Using statistical physics techniques, it is found that the decoupling principle still holds in both scenarios, i.e., each user experiences an equivalent single-user Gaussian channel, where the degradation in the SNR, known as the multiuser efficiency, is obtained analytically by solving a set of joint equations. The results apply to optimal multiuser detectors as well as many well-know suboptimal detectors.

Original languageEnglish (US)
Title of host publication43rd Annual Allerton Conference on Communication, Control and Computing 2005
PublisherUniversity of Illinois at Urbana-Champaign, Coordinated Science Laboratory and Department of Computer and Electrical Engineering
Pages1036-1045
Number of pages10
ISBN (Electronic)9781604234916
StatePublished - Jan 1 2005
Event43rd Annual Allerton Conference on Communication, Control and Computing 2005 - Monticello, United States
Duration: Sep 28 2005Sep 30 2005

Publication series

Name43rd Annual Allerton Conference on Communication, Control and Computing 2005
Volume2

Other

Other43rd Annual Allerton Conference on Communication, Control and Computing 2005
CountryUnited States
CityMonticello
Period9/28/059/30/05

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

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