Spatial nulling and beamforming in presence of very strong jammers

In many applications, software defined and cognitive receivers (SDRs and CRs) can be attacked by extremely strong jamming signals (JSs) capable not only of desensitizing but even damaging their input circuits. A method of two-stage spatial suppression of such JSs was proposed earlier by the authors. The method protects the input circuits of SDRs and CRs with antenna arrays and provides a high quality of signal reception. This paper further investigates the proposed method and demonstrates its potential. Different arrangements of the arrays' subarrays are examined, the method compatibility with beamforming and diversity combining is discussed, various geometries of the arrays are analyzed, and the use of small arrays for this method realization is considered.

[1]  Don J. Torrieri,et al.  The Maximin Adaptive-Array Algorithm for Direct-Sequence Systems , 2007, IEEE Transactions on Signal Processing.

[2]  Ali H. Sayed,et al.  Adaptive Filters , 2008 .

[3]  Ada S. Y. Poon,et al.  Supporting and Enabling Circuits for Antenna Arrays in Wireless Communications , 2012, Proceedings of the IEEE.

[4]  Yefim S. Poberezhskiy On conditions of signal reception in short wave channels , 2014, 2014 IEEE Aerospace Conference.

[5]  T. Azar,et al.  Overlapped Subarrays: Review and Update [Education Column] , 2013, IEEE Antennas and Propagation Magazine.

[6]  S. Applebaum,et al.  Adaptive arrays , 1976 .

[7]  D Cristallini,et al.  Reduced Order Jammer Cancellation Scheme Based on Double Adaptivity , 2010, IEEE Transactions on Aerospace and Electronic Systems.

[8]  B. Widrow,et al.  Adaptive antenna systems , 1967 .

[9]  Y.S. Poberezhskiy,et al.  Influence of novel sampling and reconstruction on the architecture of software defined radios , 2005, 2005 IEEE Aerospace Conference.

[10]  P. Howells,et al.  Explorations in fixed and adaptive resolution at GE and SURC , 1976 .

[11]  Y. S. Poberezhskiy,et al.  Suppression of multiple jammers with significantly different power levels , 2012, 2012 IEEE Aerospace Conference.

[12]  D. G. Brennan Linear Diversity Combining Techniques , 1959, Proceedings of the IRE.

[13]  Gerhard Fettweis,et al.  Software Radio Receivers , 1999 .

[14]  Simon Haykin,et al.  Cognitive radio: brain-empowered wireless communications , 2005, IEEE Journal on Selected Areas in Communications.