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  • Research Article
  • Open Access

Noncoherent Multiuser Communications: Multistage Detection and Selective Filtering

EURASIP Journal on Advances in Signal Processing20032002:821637

https://doi.org/10.1155/S1110865702209105

  • Received: 31 January 2002
  • Published:

Abstract

We consider noncoherent multiuser detection techniques for a system employing nonlinear modulation of nonorthogonal signals. Our aim is to investigate near-optimum noncoherent multiuser-detection techniques that utilize the received signal structure while retaining reasonable complexity. Near-optimum approximations of the maximum-likelihood detector are investigated where the signal structure is reflected in the approximation techniques explored. Several implementations of noncoherent-soft interference cancellers are proposed and investigated, each of which exploits the signal structure in a specific way. We propose a class of detectors that employ selective filtering, a technique that exploits the a priori information that each user selects one of signals for transmission. We show that selective filtering offers improved performance over the noncoherent counterparts of the existing near-optimum multiuser detectors. Both deterministic and blind adaptive implementations of selective filtering are considered. Numerical comparisons are provided to demonstrate the near-optimum performance of the proposed detectors.

Keywords

  • decor relator
  • MMSE
  • noncoherent detection
  • nonlinear modulation
  • selective filtering
  • SIC

Authors’ Affiliations

(1)
Lucent Technologies, 1D-302B, 67 Whippany Road, Whippany, NJ 07981, USA
(2)
Electrical Engineering Department, The Pennsylvania State University, 121 Electrical Engineering East, University Park, PA 16802-2705, USA
(3)
WINLAB, Electrical and Computer Engineering Department, Rutgers University, 73 Brett Road, Piscataway, NJ 08854-8060, USA

Copyright

© Sinha et al. 2002

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