Adaptive decorrelating detectors for CDMA systems

U. Mitra, H. Vincent Poor

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Multi-user detection allows for the efficient use of bandwidth in Code-Division Multiple-Access (CDMA) channels through mitigation of near-far effects and multiple-access noise limitations. Due to its inherent noise and multipath immunity, CDMA multi-access is being considered as a platform for personal communication systems (PCS). As CDMA based digital communication networks proliferate, the need to determine the presence of a new user and integrate knowledge of this new user into the detection scheme becomes more important. The decorrelating detector is a linear multi-user detector that is asymptotically optimal in terms of near far resistance; however, in the presence of a new unknown user, performance of the decorrelator is severely degraded. Adaptive decorrelators are constructed which adaptively augment an existing conventional decorrelator to demodulate a new active user in addition to existing users. Several likelihood ratio based schemes are employed. Both synchronous and asynchronous communication are investigated.

Original languageEnglish (US)
Pages (from-to)265-290
Number of pages26
JournalWireless Personal Communications
Volume2
Issue number3
DOIs
StatePublished - Sep 1 1995

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering

Keywords

  • Spread-spectrum communications
  • adaptive receiver
  • code-division multiple-access
  • decorrelating detector
  • likelihood ratio tests

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