A Pixel-Based FAS with 64-State Reconfigurability Deployed at Both Transmitter and Receiver for Interference Mitigation

Reconfigurable antennas for fluid-antenna systems (FAS) have emerged as a powerful solution for adaptive wave manipulation, enabling robust wireless communication and sensing in deep-fading and interference-prone environments. Unlike conventional MIMO architectures that require multiple RF chains and extensive baseband processing, reconfigurable antennas dynamically shape their radiation patterns to provide spatial and temporal diversity with far lower hardware complexity. In this work, we design a sub-7-GHz pixel-based reconfigurable antenna (PBRA) featuring 64 electronically switchable radiation states, offering substantially greater reconfigurability than existing fluid-antenna designs. By deploying the PBRAs at both the transmitter and receiver, we construct a pixel-based fluid antenna system (PB-FAS) that exploits its large state space and single-RF-chain architecture to enhance link reliability and multi-user performance. We present the structural configuration of the PBRA and characterize its S-parameters and state-dependent radiation behavior. We then evaluate a co-channel two-source 16-QAM downlink system using dual-end PB-FAS deployment. Experimental results show that coordinated state selection provides strong interference suppression, achieving up to 11 dB SINR improvement and 13.2% reduction in EVM. Finally, we discuss system-level extensions and identify key research challenges that may guide future developments of PB-FAS-enabled wireless systems. © 2026 IEEE.