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An Efficient Beamforming Algorithm for Large-Scale Phased Arrays with Lossy Digital Phase Shifters
Shunji TANAKA Tomohiko MITANI Yoshio EBIHARA
IEICE TRANSACTIONS on Communications
Publication Date: 2014/04/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Antennas and Propagation
phased array, lossy digital phase shifter, discrete optimization, real rotation theorem, problem decomposition,
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An efficient beamforming algorithm for large-scale phased arrays with lossy digital phase shifters is presented. This problem, which arises in microwave power transmission from solar power satellites, is to maximize the array gain in a desired direction with the gain loss of the phase shifters taken into account. In this paper the problem is first formulated as a discrete optimization problem, which is then decomposed into element-wise subproblems by the real rotation theorem. Based on this approach, a polynomial-time algorithm to solve the problem numerically is constructed and its effectiveness is verified by numerical simulations.