{"ID":6536461,"CreatedAt":"2026-07-14T01:21:01.169441415Z","UpdatedAt":"2026-07-14T15:38:47.698199434Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2607.10363","arxiv_id":"2607.10363","title":"Non-Reciprocal Dynamic Metasurface Antenna: Practical Multiport-Network Modeling and Optimization for Multi-User Interference Resilience","abstract":"Channel reciprocity fundamentally limits full-duplex (FD) base stations due to multi-user co-channel interference. We examine the potential of deploying a non-reciprocal dynamic metasurface antenna (NR-DMA) at the base station to overcome this limitation. Our NR-DMA architecture connects a single circulator to three feed ports of a multi-feed DMA with strong mutual coupling (MC) between its seven feeds and 96 1-bit-programmable meta-elements. We model our system with multiport network theory, using experimentally estimated proxy parameters of a fabricated 19-GHz DMA and the measured circulator response. Our NR-DMA's reconfigurability is captured by a diagonal tunable scattering matrix, showing that non-reciprocal DMAs and RISs need not require a \"beyond-diagonal\" tunable scattering matrix. We jointly optimize the DMA state, analog feed weights, circulator-port assignment, and circulation direction. Our optimized NR-DMA realizes distinct forward and reverse channel responses. In our interference-limited high-SNR case study, the NR-DMA improves the FD sum rate by about 60% over a reciprocal DMA benchmark. Comparisons with proxy objectives and MC-unaware optimization show that end-to-end FD optimization and MC-aware modeling are both essential.","short_abstract":"Channel reciprocity fundamentally limits full-duplex (FD) base stations due to multi-user co-channel interference. We examine the potential of deploying a non-reciprocal dynamic metasurface antenna (NR-DMA) at the base station to overcome this limitation. Our NR-DMA architecture connects a single circulator to three fe...","url_abs":"https://arxiv.org/abs/2607.10363","url_pdf":"https://arxiv.org/pdf/2607.10363v1","authors":"[\"Shuai S. A. Yuan\",\"Jean Tapie\",\"Bahman Amrahi\",\"Viktar Asadchy\",\"Philipp del Hougne\"]","published":"2026-07-11T15:42:35Z","proceeding":"eess.SP","tasks":"[\"eess.SP\",\"physics.app-ph\"]","methods":"[]","has_code":false}