Proposal on Application of Quantum Annealers for Analysis of Multiple Scattered Waves

Radio wave propagation analysis with ray-tracing is based on searching for radio propagation paths between Tx and Rx. Here, to improve the analysis accuracy, it is necessary to search for multiple paths that contribute to the propagation characteristics, but the amount of calculation increases exponentially as the number of structures to be considered and the number of interactions with structures increase. On the other hand, at present, attention is focused on quantum annealing (QA) computer that enable ultra-high-speed operations for combinatorial optimization problems. Here, it can be said that the searching for propagation paths is one of the combinatorial optimization problems. Therefore, we have proposed models applicable to QA for finding propagation paths with multiple scattering. However, these models did not consider the dependence of the scattering pattern on the direction of incidence. In this paper, the model is one in which the scattering pattern depends on the incident direction, and its performance is shown.