Wideband photonic interference cancellation based on free space optical communication

TL;DR

This paper introduces a photonic interference cancellation system that uses free space optical communication to remove wideband wireless interference in real-time, achieving high cancellation depth and multi-band processing.

Contribution

The paper presents a novel system combining photonic signal processing with free space optical links for wideband interference cancellation, enabling multi-band real-time operation.

Findings

Achieves 30dB real-time interference cancellation depth

Handles over 6GHz bandwidth in experiments

Supports simultaneous processing of multiple RF bands

Abstract

We propose and experimentally demonstrate an interference management system that removes wideband wireless interference by using photonic signal processing and free space optical communication. The receiver separates radio frequency interferences by upconverting the mixed signals to optical frequencies and processing the signals with the photonic circuits. Signals with GHz bandwidth are processed and separated in real-time. The reference signals for interference cancellation are transmitted in a free space optical communication link, which provides large bandwidth for multi-band operation and accelerates the mixed signal separation process by reducing the dimensions of the un-known mixing matrix. Experimental results show that the system achieves 30dB real-time cancellation depth with over 6GHz bandwidth. Multiple radio frequency bands can be processed at the same time with a single system. In addition, multiple radio frequency bands can be processed at the same time with a single system.