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- W4313482669 abstract "It remains an open problem to find the optimal configuration of phase shifts under the discrete constraint for intelligent reflecting surface (IRS) in polynomial time. The above problem is widely believed to be difficult because it is not linked to any known combinatorial problems that can be solved efficiently. The branch-and-bound algorithms and the approximation algorithms constitute the best results in this area. Nevertheless, this work shows that the global optimum can actually be reached in linear time on average in terms of the number of reflective elements (REs) of IRS. The main idea is to geometrically interpret the discrete beamforming problem as choosing the optimal point on the unit circle. Although the number of possible combinations of phase shifts grows exponentially with the number of REs, it turns out that there are only a linear number of circular arcs that possibly contain the optimal point. Furthermore, the proposed algorithm can be viewed as a novel approach to a special case of the discrete quadratic program (QP)." @default.
- W4313482669 created "2023-01-06" @default.
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- W4313482669 date "2023-03-01" @default.
- W4313482669 modified "2023-10-18" @default.
- W4313482669 title "A Linear Time Algorithm for the Optimal Discrete IRS Beamforming" @default.
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- W4313482669 doi "https://doi.org/10.1109/lwc.2022.3232146" @default.
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