Adaptive Control Algorithm of ESPAR Antenna Based on Stochastic Approximation Theory

Blagovest SHISHKOV; Jun CHENG; Takashi OHIRA

Adaptive Control Algorithm of ESPAR Antenna Based on Stochastic Approximation Theory

Blagovest SHISHKOV, Jun CHENG, Takashi OHIRA

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The electronically steerable passive array radiator (ESPAR) antenna is one kind of the parasitic elements based single-port output antennas with several variable reactances. It performs analog aerial beamforming and none of the signals on its passive elements can be observed. This fact and one that is more important--the nonlinear dependence of the output of the antenna from adjustable reactances--makes the problem substantially new and not resolvable by means of conventional adaptive array beamforming techniques. A novel approach based on stochastic approximation theory is proposed for the adaptive beamforming of the ESPAR antenna as a nonlinear spatial filter by variable parameters, thus forming both beam and nulls. Two learning rate schedule were examined about output SINR, stability, convergence, misadjustment, noise effect, bias term, etc., and the optimal one was proposed. Further development was traced. Our theoretic study, simulation results and performance analysis show that the ESPAR antenna can be controlled effectively, has strong potential for use in mobile terminals and seems to be very perspective.

Publication: IEICE TRANSACTIONS on Communications Vol.E85-B No.4 pp.802-811

Publication Date: 2002/04/01

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Type of Manuscript: PAPER

Category: Antenna and Propagation

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Blagovest SHISHKOV, Jun CHENG, Takashi OHIRA, "Adaptive Control Algorithm of ESPAR Antenna Based on Stochastic Approximation Theory" in IEICE TRANSACTIONS on Communications, vol. E85-B, no. 4, pp. 802-811, April 2002, doi: .
Abstract: The electronically steerable passive array radiator (ESPAR) antenna is one kind of the parasitic elements based single-port output antennas with several variable reactances. It performs analog aerial beamforming and none of the signals on its passive elements can be observed. This fact and one that is more important--the nonlinear dependence of the output of the antenna from adjustable reactances--makes the problem substantially new and not resolvable by means of conventional adaptive array beamforming techniques. A novel approach based on stochastic approximation theory is proposed for the adaptive beamforming of the ESPAR antenna as a nonlinear spatial filter by variable parameters, thus forming both beam and nulls. Two learning rate schedule were examined about output SINR, stability, convergence, misadjustment, noise effect, bias term, etc., and the optimal one was proposed. Further development was traced. Our theoretic study, simulation results and performance analysis show that the ESPAR antenna can be controlled effectively, has strong potential for use in mobile terminals and seems to be very perspective.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e85-b_4_802/_p

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@ARTICLE{e85-b_4_802,
author={Blagovest SHISHKOV, Jun CHENG, Takashi OHIRA, },
journal={IEICE TRANSACTIONS on Communications},
title={Adaptive Control Algorithm of ESPAR Antenna Based on Stochastic Approximation Theory},
year={2002},
volume={E85-B},
number={4},
pages={802-811},
abstract={The electronically steerable passive array radiator (ESPAR) antenna is one kind of the parasitic elements based single-port output antennas with several variable reactances. It performs analog aerial beamforming and none of the signals on its passive elements can be observed. This fact and one that is more important--the nonlinear dependence of the output of the antenna from adjustable reactances--makes the problem substantially new and not resolvable by means of conventional adaptive array beamforming techniques. A novel approach based on stochastic approximation theory is proposed for the adaptive beamforming of the ESPAR antenna as a nonlinear spatial filter by variable parameters, thus forming both beam and nulls. Two learning rate schedule were examined about output SINR, stability, convergence, misadjustment, noise effect, bias term, etc., and the optimal one was proposed. Further development was traced. Our theoretic study, simulation results and performance analysis show that the ESPAR antenna can be controlled effectively, has strong potential for use in mobile terminals and seems to be very perspective.},
keywords={},
doi={},
ISSN={},
month={April},}

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TY - JOUR
TI - Adaptive Control Algorithm of ESPAR Antenna Based on Stochastic Approximation Theory
T2 - IEICE TRANSACTIONS on Communications
SP - 802
EP - 811
AU - Blagovest SHISHKOV
AU - Jun CHENG
AU - Takashi OHIRA
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E85-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2002
AB - The electronically steerable passive array radiator (ESPAR) antenna is one kind of the parasitic elements based single-port output antennas with several variable reactances. It performs analog aerial beamforming and none of the signals on its passive elements can be observed. This fact and one that is more important--the nonlinear dependence of the output of the antenna from adjustable reactances--makes the problem substantially new and not resolvable by means of conventional adaptive array beamforming techniques. A novel approach based on stochastic approximation theory is proposed for the adaptive beamforming of the ESPAR antenna as a nonlinear spatial filter by variable parameters, thus forming both beam and nulls. Two learning rate schedule were examined about output SINR, stability, convergence, misadjustment, noise effect, bias term, etc., and the optimal one was proposed. Further development was traced. Our theoretic study, simulation results and performance analysis show that the ESPAR antenna can be controlled effectively, has strong potential for use in mobile terminals and seems to be very perspective.
ER -