Title :
Adaptive beamforming of ESPAR antenna based on stochastic approximation theory
Author :
Shishkov, Blagovest ; Ohira, Takashi
Author_Institution :
ATR Adaptive Commun. Res. Labs., Kyoto, Japan
Abstract :
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 simulation results show that ESPAR antenna can effectively suppress interference and noise background and is attractive in modem wireless communications systems.
Keywords :
adaptive antenna arrays; adaptive control; antenna radiation patterns; approximation theory; array signal processing; gradient methods; interference suppression; mobile antennas; stochastic processes; ESPAR antenna; adaptive beamforming; adaptive control; electronically steerable passive array radiator antennas; interference suppression; loaded reactances; noise background suppression; passive radiators; single-port output; stochastic approximation theory; stochastic gradient algorithm; wireless communications systems; Adaptive arrays; Adaptive control; Antenna arrays; Antenna theory; Approximation methods; Array signal processing; Background noise; Costs; Interference suppression; Stochastic processes;
Conference_Titel :
Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific
Conference_Location :
Taipei, Taiwan
Print_ISBN :
0-7803-7138-0
DOI :
10.1109/APMC.2001.985444
