A RAKE-Based Iterative Receiver for Space-Time Block-Coded Multipath CDMA

Sudharman K. Jayaweera, H. Vincent Poor

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A turbo multiuser receiver is proposed for space-time block and channel-coded code division multiple access (CDMA) systems in multipath channels. The proposed receiver consists of a first stage that performs detection, space-time decoding, and multipath combining followed by a second stage that performs the channel decoding. A reduced complexity receiver suitable for systems with large numbers of transmitter antennas is obtained by performing the space-time decoding along each resolvable multipath component and then diversity combining the set of space-time decoded outputs. By exchanging the soft information between the first and second stages, the receiver performance is improved via iteration. Simulation results show that while in some cases a noniterative space-time coded system may have inferior performance compared with a system without space-time coding in a multipath channel, proposed iterative schemes significantly outperform systems without space-time coding, even with only two iterations. Furthermore, the performance loss in the reduced-complexity receiver due to decoupling of interference suppression, space-time decoding, and multipath combining is very small for error rates of practical interest.

Original languageEnglish (US)
Pages (from-to)796-806
Number of pages11
JournalIEEE Transactions on Signal Processing
Volume52
Issue number3
DOIs
StatePublished - Mar 1 2004

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering

Keywords

  • Code division multiple access
  • Multiuser detection
  • RAKE combining
  • Space-time coding
  • Turbo detection

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