Sum capacity of DS-CDMA with colored noise

P. Viswanath, V. Anantharam

Research output: Contribution to journalConference article

Abstract

We consider a Direct Sequence Code Division Multiple Access (DS-CDMA) channel in colored additive Gaussian noise and focus on the sum capacity of this channel. Sum Capacity is the maximum sum of rates at which users can jointly reliably transmit, in an information theoretic sense. We completely characterize optimum sum capacity, which is obtained by choosing the signature sequences of the users appropriately. Our characterization is constructive in that we provide a combinatorial algorithm to generate the optimum signature sequences as a function of the covariance of the additive background noise and power constraints of the users. The characterization also allows us to identify a saddle property of the optimum sum capacity: convexity in the covariance matrix of the additive noise and concavity in the vector of user power constraints.

Original languageEnglish (US)
Number of pages1
JournalIEEE International Symposium on Information Theory - Proceedings
StatePublished - Dec 1 2000
Externally publishedYes
Event2000 IEEE International Symposium on Information Theory - Serrento, Italy
Duration: Jun 25 2000Jun 30 2000

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Information Systems
  • Modeling and Simulation
  • Applied Mathematics

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