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

被引：38
作者：
Tugnait, JK [1 ]
Li, TT
机构：
[1] Auburn Univ, Dept Elect & Comp Engn, Auburn, AL 36849 USA
[2] Lucent Technol, Bell Labs, Holmdel, NJ 07733 USA
来源：
IEEE TRANSACTIONS ON SIGNAL PROCESSING | 2001年 / 49卷 / 07期
基金：
美国国家科学基金会;
关键词：
blind estimation; DS-CDMA; ISI channels; multiaccess communication; multiuser detection; multiuser interference; spread spectrum communication;
D O I：
10.1109/78.928685
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：1300 / 1309
页数：10
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