# Timely CSI Acquisition Exploiting Full Duplex

## TL;DR

This paper introduces a full-duplex based method for real-time CSI acquisition in mobile systems, significantly improving throughput and outage performance over traditional half-duplex approaches.

## Contribution

It presents a novel full-duplex CSI acquisition technique that continuously updates channel information, outperforming half-duplex systems and existing full-duplex data transmission methods.

## Key findings

- Achieves at least 50% higher throughput than half-duplex systems.
- Maintains comparable or lower outage probability.
- Outperforms full-duplex data transmission at low bandwidth and power.

## Abstract

In this paper, we propose a method for acquiring accurate and timely channel state information (CSI) by leveraging full-duplex transmission. Specifically, we propose a mobile communication system in which base stations continuously transmit a pilot sequence in the uplink frequency band, while terminals use self-interference cancellation capabilities to obtain CSI at any time. Our proposal outperforms its half-duplex counterpart by at least 50% in terms of throughput while ensuring the same (or even lower) outage probability. Remarkably, it also outperforms using full duplex for downlink data transmission for low values of downlink bandwidth and received power.