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

Chiao-Yao Chuang; C.-C. Jay Kuo

doi:10.1117/12.455470

12 November 2002 Robust PN code acquisition with antenna arrays in asynchronous DS-CDMA systems

Chiao-Yao Chuang, C.-C. Jay Kuo

Proceedings Volume 4869, Emerging Technologies for Future Generation Wireless Communications; (2002) https://doi.org/10.1117/12.455470
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States

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.

Citation Download Citation

Chiao-Yao Chuang and C.-C. Jay Kuo "Robust PN code acquisition with antenna arrays in asynchronous DS-CDMA systems", Proc. SPIE 4869, Emerging Technologies for Future Generation Wireless Communications, (12 November 2002); https://doi.org/10.1117/12.455470

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