Adaptive multiuser receiver with joint channel and time delay estimation of CDMA signals based on the square-root unscented filter

Jang S. Kim, Dong Ryeol Shin, Erchin Serpedin

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The paper discusses an adaptive multiuser receiver for CDMA systems in which the scaled unscented filter (SUF) and the square root unscented filter (SURF) are used for joint estimation and tracking of the code delays and multipath coefficients of the received CDMA signals. The proposed channel estimators are more near-far resistant than the conventional extended Kalman filter (EKF) and present lower complexity than the conventional particle filter (PF) based methods. To present meaningful performance measures, the modified Cramer-Rao lower bound (CRLB) and computational complexity metrics are derived for the proposed and existing channel estimators. Computer simulation results demonstrate the superior performance of the proposed channel estimators. The proposed estimators are also shown to exhibit lower complexity relative to the PF.

Original languageEnglish
Pages (from-to)504-520
Number of pages17
JournalDigital Signal Processing: A Review Journal
Volume19
Issue number3
DOIs
Publication statusPublished - May 2009
Externally publishedYes

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Keywords

  • Channel estimation
  • Code division multiple access (CDMA)
  • Extended Kalman filter
  • Multiuser detection
  • Nonlinear recursive filter
  • Scaled unscented filter
  • Square root unscented filter

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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