An Analog Baseband Approach for Designing Full-Duplex Radios

TL;DR

This paper presents an analog baseband cancellation method for full-duplex radios, demonstrating significant improvements in signal quality and data rate through experimental characterization and analytical modeling.

Contribution

It introduces a novel analog baseband cancellation approach specifically designed for full-duplex radios, validated through experimental and analytical methods.

Findings

Up to 10 dB signal improvement

2.5 bps/Hz increase in data rate

10,000 times BER reduction

Abstract

Recent wireless testbed implementations have proven that full-duplex communication is in fact possible and can outperform half-duplex systems. Many of these implementations modify existing half-duplex systems to operate in full-duplex. To realize the full potential of full-duplex, radios need to be designed with self-interference in mind. In our work, we use an experimental setup with a patch antenna prototype to characterize the self-interference channel between two radios. In doing so, we form an analytical model to design analog baseband cancellation techniques. We show that our cancellation scheme can provide up to 10 dB improved signal strength, 2.5 bps/Hz increase in rate, and a 10,000 improvement in BER as compared to the RF only cancellation provided by the patch antenna.