Broadband Signal Alignment for Interference Resilient Multicarrier Communication

Abstract

Signal Alignment enables reliable detection and synchronization of narrowband signals amidst strong unpredictable interference, without channel estimation. It employs time repetition coding at the transmitter and canonical correlation analysis at the multi-antenna receiver. We extend this to broadband orthogonal frequency-division multiplexing systems by leveraging frequency-domain repetition. Traditional preamble-based methods struggle under strong interference from primary users. To address this, we develop a synchronization and decoding process for multicarrier systems that overcomes limitations of conventional methods. Software-defined radio experiments validate our approach, demonstrating its practicality and potential for application in Wi-Fi systems where secondary users share spectrum with strong primary users.