arxiveess.SP2026-07-24
Group-Connected Riemannian Manifold Optimization for Reciprocal BD-RIS
Marko Fidanovski, Thushar Venkataramanaiah, Eduard Jorswieck, Giuseppe Thadeu Freitas de Abreu
Reconfigurable intelligent surfaces (RISs) provide a flexible means of engineering wireless propagation channels through configurable multiport scattering networks. Among their architectures, group-connected beyond-diagonal RISs (BD-RISs) offer a practical tradeoff between scatte…