Blind adaptive multiuser detection in multipath code divisionmultiple access channels

摘要

In this paper, blind adaptive multiuser detection in multipathnCDMA channels based on the MMSE (minimum mean-squared error) criteria isnproposed. Compared with the multiuser detections presented by M. Honignet al. (see IEEE Trans. on Information Theory, vol.41, no.4, p.944-60,n1995) and X.D. Wang and H.V. Poor (see IEEE Trans. on InformationnTheory, vol.44, no.2, p.677-90, 1998; IEEE Trans. on Signal Processing,nvol.46, no.11, p.3030-44, 1998), this one takes advantage of thenstructure and characteristic of two subspaces: 1) the subspace structurenassociated with the code of the desired user; 2) the estimatedn“signal subspace” of the covariance matrix for the observednsignals. Simulations state this detection has strong ability againstnnear-far and multipath effects. Meanwhile, it avoids significantnperformance reduction when signature mismatch exists