Power allocation and spectral efficiency of DS-CDMA systems in fading channels with fixed QoS-part II: Multiple-rate case

Husheng Li, H. Vincent Poor

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Power allocation results for equal-rate systems developed in Part I are extended to multiple-rate systems. For both systems with and without channel state information at the transmitter (CSIT), conditions for the optimality of successive interference cancellation combined with minimum mean square error multiuser detection (SIC+MMSE) are obtained. When CSIT is available, the optimal decoding order is discussed for optimal SIC+MMSE and two sub-optimal decoding schemes. Explicit expressions for the spectral efficiency parameters in the low or high energy regions are also obtained.

Original languageEnglish (US)
Article number1687776
Pages (from-to)2529-2538
Number of pages10
JournalIEEE Transactions on Wireless Communications
Volume5
Issue number9
DOIs
StatePublished - Sep 1 2006

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • Decoding order
  • Direct sequence code division multiple access (DS-CDMA)
  • Minimum mean square error (MMSE)
  • Multiuser detection
  • Spectral efficiency
  • Successive interference cancellation (SIC)

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