Repeated blocking based robust beamforming for coherent interference cancellation

An adaptive beamforming method for the rejection of coherent and incoherent interferences is suggested which is robust against errors in the desired signal direction and does not require any information on interference directions. The weight vector of the proposed method is controlled such that it is orthogonal to an estimated interference subspace (IS), which is obtained through the signal-blocking for the removal of the desired signal. The successive repetition of the signal-blocking can greatly reduce desired signal components leaking into an estimated IS due to pointing errors, thereby providing the robustness for the proposed beamformer. The subspace estimate is simply constructed by efficiently exploiting the signal-blocked vectors, which leads to low computational complexity.

[1]  B.H. Wang.  Adaptive array with global weighted spatial smoothing , 2004 .

[2]  B. Carlson.  Covariance matrix estimation errors and diagonal loading in adaptive arrays , 1988 .

[3]  Thomas Kailath,et al.  Adaptive beamforming for coherent signals and interference , 1985, IEEE Trans. Acoust. Speech Signal Process..

[4]  Bernard Widrow,et al.  Signal cancellation phenomena in adaptive antennas: Causes and cures , 1982 .

[5]  Stephen P. Boyd,et al.  Convex Optimization , 2004, Algorithms and Theory of Computation Handbook.

[6]  Yang-Ho Choi,et al.  On conditions for the rank restoration in forward/backward spatial smoothing , 2002, IEEE Trans. Signal Process..

[7]  Surendra Prasad,et al.  An improved spatial smoothing technique for bearing estimation in a multipath environment , 1988, IEEE Trans. Acoust. Speech Signal Process..

[8]  B. Noble.  Applied Linear Algebra , 1969 .

[9]  Zhi-Quan Luo,et al.  Robust adaptive beamforming using worst-case performance optimization: a solution to the signal mismatch problem , 2003, IEEE Trans. Signal Process..

[10]  Jian Li,et al.  Doubly constrained robust Capon beamformer , 2003, The Thrity-Seventh Asilomar Conference on Signals, Systems & Computers, 2003.

[11]  W. Liu,et al.  Novel robust beamformers for coherent interference suppression with direction-of-arrival estimation errors , 2010 .

[12]  M. Melamed.  Detection , 2021, SETI: Astronomy as a Contact Sport.

[13]  Ju-Hong Lee,et al.  Adaptive processing for beamforming with coherent interference using uniform circular arrays , 2008, Digit. Signal Process..

[14]  Xavier Mestre,et al.  Finite sample size effect on minimum variance beamformers: optimum diagonal loading factor for large arrays , 2006, IEEE Transactions on Signal Processing.

[15]  J. E. Hudson.  Adaptive Array Principles , 1981 .

[16]  Yang-Ho Choi.  Fast Adaptive Beamforming for Coherent Interference Cancellation Using Forward/Backward Correlations , 2009, IEICE Trans. Commun..

[17]  Lin Du,et al.  Review of user parameter-free robust adaptive beamforming algorithms , 2008 .

[18]  K. W. Lo.  Improving performance of real-symmetric adaptive array by signal blocking , 1995 .

[19]  Jos F. Sturm,et al.  A Matlab toolbox for optimization over symmetric cones , 1999 .

[20]  A.B. Gershman,et al.  Robust adaptive beamforming using worst-case performance optimization , 2003, The Thrity-Seventh Asilomar Conference on Signals, Systems & Computers, 2003.

[21]  Yang-Ho Choi,et al.  Robust adaptive beamforming method using principal eigenpairs with modification of PASTd , 2013, Digit. Signal Process..