On the average near-far resistance for MMSE detection of direct sequence CDMA signals with random spreading

Upamanyu Madhow*, Michael L. Honig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.

Original languageEnglish (US)
Pages (from-to)2039-2045
Number of pages7
JournalIEEE Transactions on Information Theory
Volume45
Issue number6
DOIs
StatePublished - 1999

Keywords

  • Cdma (code-division multiple access)
  • Direct sequence
  • Interference suppression
  • Multiuser detection
  • Random signature sequence
  • Spread spectrum

ASJC Scopus subject areas

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

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