Semi-Blind Two-Dimensional Code Acquisition in CDMA Communications

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In this paper, the authors propose a new algorithm for joint time-delay and Direction-Of-Arrival (DOA) estimation, here called two-dimensional code acquisition, in an asynchronous Direct-Sequence Code-Division Multiple-Access (DS-CDMA) array system. This algorithm depends on eigenvector-eigenvalue decomposition of sample correlation matrix, and requires knowing desired user's training sequence. The performance of the algorithm is analyzed both analytically and numerically in uncorrelated and coherent multipath environment. Numerical examples show that the algorithm is robust with unknown number of coherent signals.