Adaptive blind MIMO channel estimation and mutiuser detection in DS-CDMA systems

I. Tai Lu, Jaeyoung Kwak

Research output: Contribution to conferencePaper

Abstract

A novel adaptive blind approach is developed to simultaneously equalize and estimate the MIMO channel in DS-CDMA systems. The approach consists of two phases: multiuser detection and channel estimation. For multiuser detection, a blind adaptive space-time scheme developed in [Kwak & Lu, ICC'98] is employed to suppress the MutiUser Interference (MUI) or Multiple Access Interference (MAI). The receiver consists of a space-time array and a decorrelator. The blind adaptive procedure is implemented using the constant modulus algorithm (CMA) and the decision directed algorithm (DDA). For channel estimation, the respread sequences of decision symbols are used as references. And the MIMO (MultiInput MultiOutput) channels are estimated (also blindly) using minimum mean square error estimation (MMSE). The adaptation to the varying environment or signals is implemented using the stochastic gradient method.

Original languageEnglish (US)
Pages2254-2258
Number of pages5
StatePublished - 1999
Event1999 IEEE Global Telecommunication Conference - GLOBECOM'99 - Rio de Janeiro, Braz
Duration: Dec 5 1999Dec 9 1999

Other

Other1999 IEEE Global Telecommunication Conference - GLOBECOM'99
CityRio de Janeiro, Braz
Period12/5/9912/9/99

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

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