# Passive Self-Interference Suppression for Full-Duplex Infrastructure Nodes

arXiv: https://arxiv.org/abs/1302.2185 · HTML: https://mlsanity.com/paper/1302.2185/

## Key facts

- Cited by 3 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 9 Feb 2013.

## Built on by (most cited first, 3 of 3)

- [Hybrid-Layers Neural Network Architectures for Modeling the Self-Interference in Full-Duplex Systems](https://mlsanity.com/paper/2110.09997/) (2021)
- [Parallel APSM for Fast and Adaptive Digital SIC in Full-Duplex Transceivers with Nonlinearity](https://mlsanity.com/paper/2207.05461/) (2022)
- [RL-Aided Cognitive ISAC: Robust Detection and Sensing-Communication Trade-offs](https://mlsanity.com/paper/2511.02672/) (2025)

## Abstract (arXiv)

Recent research results have demonstrated the feasibility of full-duplex wireless communication for short-range links. Although the focus of the previous works has been active cancellation of the self-interference signal, a majority of the overall self-interference suppression is often due to passive suppression, i.e., isolation of the transmit and receive antennas. We present a measurement-based study of the capabilities and limitations of three key mechanisms for passive self-interference suppression: directional isolation, absorptive shielding, and cross-polarization. The study demonstrates that more than 70 dB of passive suppression can be achieved in certain environments, but also establishes two results on the limitations of passive suppression: (1) environmental reflections limit the amount of passive suppression that can be achieved, and (2) passive suppression, in general, increases the frequency selectivity of the residual self-interference signal. These results suggest two design implications: (1) deployments of full-duplex infrastructure nodes should minimize near-antenna reflectors, and (2) active cancellation in concatenation with passive suppression should employ higher-order filters or per-subcarrier cancellation.