Movable Antenna-Aided Broadcast Packet Erasure Channels: Capacity With Dynamic Position Plan

The emergence of new wireless technologies, such as movable antennas and reconfigurable intelligent surfaces, enable channel morphing. In this new paradigm, variations in channel statistics may be decided and thus known prior to communications, deviating from the conventional ergodic models in which the underlying processes that govern channel statistics are assumed to be temporally independent. To provide a fundamental understanding beyond the typical physical-layer studies, we study the capacity region of movable antenna-aided broadcast packet erasure channels, and provide new inner and outer bounds. The proposed linear network-coding protocol opportunistically benefits from the prior knowledge of future statistical changes, and achieves the outer-bounds for a wide range of parameters. Network capacity can be further maximized in a cross-layer fashion by determining optimal channel statistics controlled by the movable antenna position.