Psomas, Constantinos; Kraidy, Ghassan M; Wong, Kai-Kit; Krikidis, Ioannis; (2023) Fluid Antenna Systems with Outdated Channel Estimates. In: Proceedings ICC 2023 - IEEE International Conference on Communications. (pp. pp. 2970-2975). IEEE: Rome, Italy.

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Abstract

A desired characteristic of future communication networks is the notion of reconfigurability. For a wireless device, this can be realized through the employment of the so-called fluid antennas (FAs). An FA consists of a dielectric holder, in which a radiating liquid moves between pre-defined locations (called ports) that serve as the device's antennas. Therefore, due to the nature of liquids, an FA can essentially take any size and shape, making them both flexible and reconfigurable. In this paper, we study the outage probability of FAs where the scheduled port, based on selection combining, is subject to scheduling delays. An analytical framework is provided for the performance with and without estimation errors, as a result of post-scheduling delays. We show that even though FAs achieve maximum channel (spatial) diversity, this cannot be attained in the presence of delays.

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