The most favorable impulsive interference for ternary CDMA

Moran Gariby, Tal Gariby, Ram Zamir

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Ternary Code Division Multiple Access (CDMA) with a variable number of non-zero chips per symbol allows to control the transmission impulsiveness, ranging from nonimpulsive signaling (with all chips being non-zero) to a fully impulsive signal (with only one chip per symbol being nonzero). The former corresponds to conventional CDMA while the latter to Impulse-Radio (IR). Recent work showed that the fully impulsive signal maximizes the Average Signal to Interference Ratio (ASIR) in asynchronous multiple user environment. We extend this result to information measures, and show that by adapting the impulsiveness figure (i.e., the number of non zero chips) to the channel conditions, the system can create a favorable interference environment for the other users. In particular, fully impulsive signaling maximizes the Shannon capacity of each user (treating interference from other users as noise). On the other hand, at transmission rates strictly below capacity, less impulsive signaling is better in terms of decoding error probability.

Original languageEnglish
Title of host publicationProceedings - 2006 IEEE International Symposium on Information Theory, ISIT 2006
Pages942-946
Number of pages5
DOIs
StatePublished - 2006
Event2006 IEEE International Symposium on Information Theory, ISIT 2006 - Seattle, WA, United States
Duration: 9 Jul 200614 Jul 2006

Publication series

NameIEEE International Symposium on Information Theory - Proceedings
ISSN (Print)2157-8101

Conference

Conference2006 IEEE International Symposium on Information Theory, ISIT 2006
Country/TerritoryUnited States
CitySeattle, WA
Period9/07/0614/07/06

Keywords

  • Capacity with side information
  • Error exponent
  • Impulsive channel
  • Probability control

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