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Beamforming experiment with a DBF multibeam antenna in a mobile satellite environment

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5 Author(s)
R. Miura ; Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan ; T. Tanaka ; I. Chiba ; A. Horie
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This paper describes a digital beamforming (DBF) multibeam antenna that incorporates a compact digital signal processor (DSP) engine, and the results of using it in a beamforming experiment receiving a satellite signal in a land-mobile environment. A considerable reduction in the scale of the DSP engine has been achieved by using field programmable gate arrays (FPGAs). To capture a satellite signal arriving from an unknown direction, a two-dimensional (2-D) spatial FFT signal processing provides orthogonal multibeam patterns on the broad side of a planar array antenna. The experimental results demonstrated the features of coarse acquisition and tracking of a signal arrival by selecting the strongest of the beams without assistance from direction finding sensors or microwave phase shifters. The DBF multibeam antenna will provide high-quality communications and increase traffic capacity if it is applied to high-gain mobile antennas or multispot-beam base station antennas in cellular or satellite mobile communications

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IEEE Transactions on Antennas and Propagation  (Volume:45 ,  Issue: 4 )