# Full-Duplex GFDM Radio Transceivers in the Presence of Phase Noise, CFO and IQ Imbalance

## TL;DR

This paper evaluates the impact of RF impairments on full-duplex GFDM transceivers, proposing a receiver filter that significantly improves SIR over FD OFDM in the presence of phase noise, CFO, and IQ imbalance.

## Contribution

It introduces a novel FD GFDM receiver filter that enhances SIR and provides analytical solutions for residual SI and signal power under RF impairments.

## Key findings

- FD GFDM is more sensitive to RF impairments than FD OFDM.
- The proposed receiver filter achieves 25 dB higher SIR than FD OFDM.
- Analytical expressions for residual SI and SIR are derived.

## Abstract

This paper addresses the performance of a full-duplex (FD) generalized frequency division multiplexing (GFDM) transceiver in the presence of radio frequency (RF) impairments including phase noise, carrier frequency offset (CFO) and in-phase (I) and quadrature (Q) imbalance. We study analog and digital self-interference (SI) cancellation and develop a complementary SI suppression method. Closed-form solutions for the residual SI power and the desired signal power and signal-to-interference ratio (SIR) are provided. Simulation results show that the RF impairments degrade SI cancellation and FD GFDM is more sensitive to them compares to FD orthogonal frequency division multiplexing (OFDM). Hence, we propose an FD GFDM receiver filter for maximizing the SIR. Significantly, it achieves 25 dB higher SIR than FD OFDM transceiver.