Skip to main content

Computationally Efficient Blind Code Synchronization for Asynchronous DS-CDMA Systems with Adaptive Antenna Arrays

Abstract

A novel space-time adaptive near-far robust code-synchronization array detector for asynchronous DS-CDMA systems is developed in this paper. There are the same basic requirements that are needed by the conventional matched filter of an asynchronous DS-CDMA system. For the real-time applicability, a computationally efficient architecture of the proposed detector is developed that is based on the concept of the multistage Wiener filter (MWF) of Goldstein and Reed. This multistage technique results in a self-synchronizing detection criterion that requires no inversion or eigendecomposition of a covariance matrix. As a consequence, this detector achieves a complexity that is only a linear function of the size of antenna array (), the rank of the MWF (), the system processing gain (), and the number of samples in a chip interval (), that is,. The complexity of the equivalent detector based on the minimum mean-squared error (MMSE) or the subspace-based eigenstructure analysis is a function of. Moreover, this multistage scheme provides a rapid adaptive convergence under limited observation-data support. Simulations are conducted to evaluate the performance and convergence behavior of the proposed detector with the size of the-element antenna array, the amount of the-sample support, and the rank of the-stage MWF. The performance advantage of the proposed detector over other DS-CDMA detectors is investigated as well.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Chia-Chang Hu.

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and Permissions

About this article

Cite this article

Hu, CC. Computationally Efficient Blind Code Synchronization for Asynchronous DS-CDMA Systems with Adaptive Antenna Arrays. EURASIP J. Adv. Signal Process. 2005, 132973 (2005). https://doi.org/10.1155/ASP.2005.683

Download citation

  • Received:

  • Revised:

  • Published:

  • DOI: https://doi.org/10.1155/ASP.2005.683

Keywords and phrases:

  • code-timing acquisition
  • rank reduction
  • smart antennas
  • adaptive interference suppression
  • generalized likelihood ratio test