Papers by Blagovest Shishkov
This paper overviews our recent research on adaptive beamforming of reactively controlled array a... more This paper overviews our recent research on adaptive beamforming of reactively controlled array as a nonlinear spatial filter with variable parameters, which forms both beam and nulls. The learning rate schedule is examined with respect to output SINR, convergence, stability, misadjustment, noise effect etc. Our theoretic study, simulation results and performance analysis show that such kind of arrays can be
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Ieice Transactions on Electronics, Mar 1, 2002
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9Th European Signal Processing Conference, 1998
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Recent advances in space exploration have shown a great need for antennas with high resolution, h... more Recent advances in space exploration have shown a great need for antennas with high resolution, high gain and low side lobe level (SLL). The last characteristic is of paramount importance especially for the Microwave Power Transmission (MPT) in order to achieve higher transmitting efficiency (TE) and higher beam collection efficiency (BCE). In order to achieve low side lobe levels, statistical methods play an important role. Various interesting properties of a large antenna arrays with randomly, uniformly and combined spacing of elements have been studied, especially the relationship between the required number of elements and their appropriate spacing from one viewpoint and the desired SLL, the aperture dimension, the beamwidth and TE from the other. We propose a new unified approach in searching for reducing SLL by exploiting the interaction of deterministic and stochastic workspaces of proposed algorithms. Our models indicate the side lobe levels in a large area around the main b...
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APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577), 2001
A novel approach based on stochastic approximation theory is devoted to adaptive beamforming of e... more A novel approach based on stochastic approximation theory is devoted to adaptive beamforming of electronically steerable passive array radiator (ESPAR) antennas. Because of the low cost, the ESPAR antenna has only a single-port output. The proposed algorithm, by unconventional method, performs adaptive control of loaded reactances on the passive radiators and thus forming both beam and nulls. Our study and
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Recent advances in space exploration have shown a great need for antennas with high resolution, h... more Recent advances in space exploration have shown a great need for antennas with high resolution, high gain and low sidelobe level (SLL). The last characteristic is of paramount importance especially for the Microwave Power Transmission (MPT) in order to achieve higher transmitting efficiency (TE) and higher beam collection efficiency (BCE). In this concern statistical methods play an important role. Various interesting properties of a large antenna arrays with randomly, uniformly and combined spacing of elements are studied and especially the relationship between the required number of elements and their appropriate spacing from one part and the desired SLL, the aperture dimension, the beamwidth and TE from the other. We propose a new unified approach in searching for reducing SLL by exploiting the interaction of deterministic and stochastic workspaces of proposed algorithms. Our models indicate any advantages with respect to sidelobes in the large area around the main beam and stron...
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IEICE Transactions on Communications, 2008
The concept of placing enormous Solar Power Satellite (SPS) systems in space represents one of a ... more The concept of placing enormous Solar Power Satellite (SPS) systems in space represents one of a handful of new technological options that might provide large scale, environmentally clean base load power to terrestrial markets. Recent advances in space exploration have shown a great need for antennas with high resolution, high gain and low side lobe level (SLL). The last characteristic
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Dokladi Na B Lgarskata AkademiĆ¢ Na Naukite, 2008
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Papers by Blagovest Shishkov