Blind space-time detection in asynchronous multipath CDMA channels

A code-constrained inverse filter criterion based approach is presented for blind detection of asynchronous short-code DS-CDMA (direct sequence code division multiple access) signals in multipath channels using a receiver antenna array. Only the spreading code of the desired user is assumed to be kn...

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Bibliographic Details
Published in2000 Globecom Vol. 2; pp. 901 - 905 vol.2
Main Author Tugnait, J.K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2000
Subjects
Antenna arrays
Data mining
Delay
Direct-sequence code-division multiple access
Equalizers
Filters
Intersymbol interference
Multiaccess communication
Multipath channels
Receiving antennas
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ISBN0780364511
9780780364516
DOI10.1109/GLOCOM.2000.891269

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Summary:A code-constrained inverse filter criterion based approach is presented for blind detection of asynchronous short-code DS-CDMA (direct sequence code division multiple access) signals in multipath channels using a receiver antenna array. Only the spreading code of the desired user is assumed to be known; its transmission delay may be unknown. We exploit maximization of the normalized fourth cumulant of inverse filtered (equalized) data 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 existing users. An illustrative simulation example is provided.
ISBN:0780364511
9780780364516
DOI:10.1109/GLOCOM.2000.891269