Adaptive blind chip-level multi-user detection in multi-rate synchronous DS-CDMA system with partial loading

M. Hadef, S. Weiss

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This paper addresses an adaptive blind multiuser detection strategy for a multi-rate direct sequence CDMA downlink channel. Specifically, two chip-level equalisation schemes, using either variable spreading length (VSL) or multi-code (MCD) multi-rate access modes, are proposed and tested. Both equalisers can be updated by minimising a hybrid CM/MSE cost function based on the constant modulus (CM) criterion for active users and a mean square error (MSE) criterion for inactive users in a partially loaded system. The BER performance abd the convergence of the proposed algorithms are analysed and compared through various simulations in both partially and fully loaded systems. Essentially, our results show that the VSL algorithm exhibits faster convergence than the MCD scheme while similar BER performance over different multi-path channels is achieved.
Original languageEnglish
Number of pages4
Publication statusPublished - Jun 2004
Event2nd International Workshop on Signal Processing for Wireless Communications - London, United Kingdom
Duration: 2 Jun 20044 Jun 2004


Conference2nd International Workshop on Signal Processing for Wireless Communications
Country/TerritoryUnited Kingdom


  • adaptive
  • blind chip-level
  • multi-user detection
  • multi-rare
  • synchronous ds-cdma system
  • partial loading
  • multi-rate direct sequence
  • two chip-level equalisation schemes
  • variable spreading length
  • vsl
  • multi-code
  • mce
  • multi-rate
  • access modes
  • equalisers

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