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Proceedings Paper

Robust PN code acquistion with antenna arrays in asynchronous DS-CDMA systems
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Paper Abstract

The problem of PN code acquisition at base stations in asynchronous direct-sequence code-division multiple access (DS-CDMA) systems equipped with antenna arrays is investigated in this work. Both the fading and the near-far interference effects of the communication channel are considered. The antenna system in the base station is a one-dimensional (1D) linear beamforming array. After formulating the acquisition problem, we propose several methods for its solution. They include: the least squares method, the constrained optimization method, the weighted eigenvectors method and the generalized likelihood ratio test method. The system parameters such as the fading gain, the direction of arrival (DOA) and transmitted data symbols from each active mobile user are assumed to be unknown but deterministic in our model. The only knowledge is the spreading code of the desired user. It is demonstrated by simulation results that our proposed solutions are resistant to the near-far effect and robust to the change of the fading environment.

Paper Details

Date Published: 12 November 2002
PDF: 12 pages
Proc. SPIE 4869, Emerging Technologies for Future Generation Wireless Communications, (12 November 2002); doi: 10.1117/12.455470
Show Author Affiliations
Chiao-Yao Chuang, Univ. of Southern California (United States)
C.-C. Jay Kuo, Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 4869:
Emerging Technologies for Future Generation Wireless Communications
Carl R. Nassar, Editor(s)

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