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Blind detection of asynchronous CDMA signals in multipath channels using code-constrained inverse filter criterion

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2 Author(s)
Tugnait, J.K. ; Dept. of Electr. & Comput. Eng., Auburn Univ., AL, USA ; Tongtong Li

A code-constrained inverse filter criterion based approach is presented for blind detection of asynchronous short-code direct sequence code division multiple access (DS-CDMA) signals in multipath channels. Only the spreading code of the desired user is assumed to be known; its transmission delay may be unknown. We focus on maximization of the normalized fourth cumulant of inverse filtered (equalized) data with respect to (w.r.t.) the equalizer coefficients subject to the equalizer lying in a subspace associated with the desired user's code sequence. Constrained maximization leads to extraction of the desired user's signal, whereas unconstrained maximization leads to the extraction of any one of the active users. Illustrative simulation examples are provided

Published in:

Signal Processing, IEEE Transactions on  (Volume:49 ,  Issue: 7 )

Date of Publication:

Jul 2001

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