Interference suppression in DS/FH system using modified two sided adaptive filter

The detection properties of a modified two sided RLS (recursive least squares) adaptive filter is considered. The basic RLS whitening interpolation filter is modified by applying the Huber m-estimation principle. Two types of modified whitening interpolation filters are presented. The detection capability of the basic version and two modified versions are investigated through simulations in a nonstationary interference environment. Simulation results indicate that the detection performance of the filter is increased remarkably by the modifications.

[1]  L. B. Milstein,et al.  Interference rejection techniques in spread spectrum communications , 1988, Proc. IEEE.

[2]  Sergios Theodoridis,et al.  An adaptive LS algorithm based on orthogonal Householder transformations , 1996, Proceedings of Third International Conference on Electronics, Circuits, and Systems.

[3]  Zeljko M. Durovic,et al.  Robust estimation with unknown noise statistics , 1999, IEEE Trans. Autom. Control..

[4]  E. Kanterakis.  A novel technique for narrowband/broadband interference excision in DS-SS communications , 1994, Proceedings of MILCOM '94.

[5]  Björn E. Ottersten,et al.  Low-complexity estimators for distributed sources , 2000, IEEE Trans. Signal Process..

[6]  R. O. Schmidt,et al.  Multiple emitter location and signal Parameter estimation , 1986 .

[7]  James R. Zeidler,et al.  Adaptive interference suppression for CDMA based PCN systems , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[8]  Björn E. Ottersten,et al.  Estimation of nominal direction of arrival and angular spread using an array of sensors , 1996, Signal Process..

[9]  Iickho Song,et al.  Distributed source modeling and direction-of-arrival estimation techniques , 1997, IEEE Trans. Signal Process..

[10]  T. J. Kumpumaki,et al.  Narrow-band interference rejection using transform domain signal processing in a hybrid DS/FH spread-spectrum system , 1997, MILCOM 97 MILCOM 97 Proceedings.

[11]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[12]  Thomas Kailath,et al.  Detection of signals by information theoretic criteria , 1985, IEEE Trans. Acoust. Speech Signal Process..

[13]  Hsien-Tsai Wu,et al.  Source number estimators using transformed Gerschgorin radii , 1995, IEEE Trans. Signal Process..