Optimization of RIS-aided SISO Systems Based on a Mutually Coupled Loaded Wire Dipole Model
Asilomar Conference on Signals, Systems and Computers(2023)
摘要
The electromagnetic (EM) features of reconfigurable intelligent surfaces
(RISs) fundamentally determine their operating principles and performance.
Motivated by these considerations, we study a single-input single-output (SISO)
system in the presence of an RIS, which is characterized by a circuit-based
EM-consistent model. Specifically, we model the RIS as a collection of thin
wire dipoles controlled by tunable load impedances, and we propose a
gradient-based algorithm for calculating the optimal impedances of the
scattering elements of the RIS in the presence of mutual coupling. Furthermore,
we prove the convergence of the proposed algorithm and derive its computational
complexity in terms of number of complex multiplications. Numerical results
show that the proposed algorithm provides better performance and converges
faster than a benchmark algorithm.
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