Title :
Blind multi-user MMSE detection of CDMA signals
Author :
Gesbert, David ; Sorelius, Joakim ; Paulraj, Arogyaswami
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
Abstract :
The recovery of code-division multiple access (CDMA) information signals in a frequency selective fading channel is a problem of great theoretical and practical interest. This paper addresses the estimation of an optimal (within the class of linear detectors) multi-user CDMA receiver. A novel approach is introduced that enables the estimation of the minimum mean-square error (MMSE) detector in a blind setting. The MMSE detector is obtained through a double subspace projection that exploits the subspace structure associated with both the code of the desired user and the estimated signal subspace of the covariance matrix for the observed signals. The technique allows for interference rejection without requiring the knowledge of the codes for the interferers
Keywords :
code division multiple access; covariance matrices; fading; interference suppression; least mean squares methods; parameter estimation; pseudonoise codes; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; telecommunication channels; CDMA signals; DS-CDMA; MMSE detector; blind multi-user MMSE detection; code; code-division multiple access; covariance matrix; double subspace projection; estimated signal subspace; frequency selective fading channel; interference rejection; minimum mean-square error; multi-user CDMA receiver; observed signals; Contracts; Detectors; Fading; Information systems; Laboratories; MIMO; Multiaccess communication; Multipath channels; RAKE receivers; Signal detection;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.679535
