Performance Analysis of Fluid Antenna Multiple Access Assisted Wireless Powered Communication Network

This paper investigates a novel wireless powered communication network (WPCN) enabled by fluid antenna multiple access (FAMA). In the proposed system, a hybrid access point (HAP) equipped with multiple fixed-position antennas (FPA) delivers integrated data and energy transfer (IDET) services. Each low-power device is equipped with a single fluid antenna (FA) and utilizes the harvested energy to support its uplink communication. A block-correlation fading channel model is adopted to analyze the outage probabilities of downlink and uplink wireless data transfer (WDT) under various port selection strategies, including downlink signal-to-interference ratio-based port selection (DSPS), downlink energy-harvesting-power-based port selection (DEPS), uplink signal-to-noise ratio-based port selection (USPS), and uplink channel-based port selection (UCPS). To facilitate analysis, a step function approximation (SFA) method is proposed and then employed to obtain tractable expressions, including simplified integral forms. Moreover, lower bounds for the uplink WDT outage probability are derived. Numerical results validate the accuracy of the theoretical analysis and provide useful insights for system design.