Advances on time-modulated arrays for cognitive radio

In time-modulated arrays (TMAs), the fourth dimension, time, is exploited to synthesize antenna systems characterized by unconventional operational features that make them attractive for next generation communication systems based on Cognitive Radio. The possibility to synthesize TMAs able to generate multiple beams, suitable in multiple-input multiple-out (MIMO) systems, and to transmit the information in a correct manner only along some particular directions are discussed in this paper with main emphasis on the first problem. These features are obtained by simply reconfiguring the on-off control of a set of radio-frequency switches used in the beamforming network to modulate the static excitation weights.

[1]  R. T. Compton.  Adaptive Antennas: Concepts and Performance , 1988 .

[2]  Z. Nie,et al.  A Novel Electronic Beam Steering Technique in Time Modulated Antenna Array , 2009 .

[3]  Shiwen Yang,et al.  A new technique for power-pattern synthesis in time-modulated linear arrays , 2003 .

[4]  Paolo Rocca,et al.  Pattern synthesis in time-modulated linear arrays through pulse shifting , 2010 .

[5]  T. Hong,et al.  RF DIRECTIONAL MODULATION TECHNIQUE USING A SWITCHED ANTENNA ARRAY FOR PHYSICAL LAYER SECURE COMMUNICATION APPLICATIONS , 2011 .

[6]  P. Rocca,et al.  Almost Time-Independent Performance in Time-Modulated Linear Arrays , 2009, IEEE Antennas and Wireless Propagation Letters.

[7]  Shiwen Yang,et al.  Design of a uniform amplitude time modulated linear array with optimized time sequences , 2005 .

[8]  Paolo Rocca,et al.  Synthesis of Time-Modulated Planar Arrays with Controlled Harmonic Radiations , 2010 .

[9]  P. Rocca,et al.  Adaptive Nulling in Time-Varying Scenarios Through Time-Modulated Linear Arrays , 2012, IEEE Antennas and Wireless Propagation Letters.

[10]  Walter Tuttlebee,et al.  Software defined radio : origins, drivers and international perspectives , 2002 .

[11]  Shiwen Yang,et al.  Sideband suppression in time-modulated linear arrays by the differential evolution algorithm , 2002 .

[12]  Shiwen Yang,et al.  Direction of Arrival Estimation in Time Modulated Linear Arrays With Unidirectional Phase Center Motion , 2010, IEEE Transactions on Antennas and Propagation.

[13]  Shiwen Yang,et al.  Design of a Low Sidelobe Time Modulated Linear Array With Uniform Amplitude and Sub-Sectional Optimized Time Steps , 2012, IEEE Transactions on Antennas and Propagation.

[14]  Paolo Rocca,et al.  Sideband radiation reduction exploiting pattern multiplication in directive time-modulated linear arrays , 2012 .

[15]  Alan Tennant,et al.  Sideband level suppression in time-modulated linear arrays using modified switching sequences and fixed bandwidth elements , 2012 .

[16]  A. Tennant,et al.  A Two-Channel Time Modulated Linear Array With Adaptive Beamforming , 2012, IEEE Transactions on Antennas and Propagation.

[17]  P. Rocca,et al.  Handling Sideband Radiations in Time-Modulated Arrays Through Particle Swarm Optimization , 2010, IEEE Transactions on Antennas and Propagation.

[18]  P. Rocca,et al.  Time-modulation for MIMO systems — Potentials and trends , 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

[19]  P. Rocca,et al.  Harmonic Beamforming in Time-Modulated Linear Arrays , 2011, IEEE Transactions on Antennas and Propagation.

[20]  P. Rocca,et al.  Evolutionary optimization as applied to inverse scattering problems , 2009 .

[21]  F. Ares,et al.  Signal Radiation and Power Losses of Time-Modulated Arrays , 2008, IEEE Transactions on Antennas and Propagation.