Synchronization-free radchat for automotive radar interference mitigation
Journal article, 2021

Automotive radar interference mitigation is expected to be inherent in all future ADAS and AD vehicles. Joint radar communications is a candidate technology for removing this interference by coordinating radar sensing through communication. Coordination of radars requires strict time synchronization among vehicles, and our formerly proposed protocol (RadChat) achieves this by a precise absolute time, provided by GPS clocks of vehicles. However, interference might appear if synchronization among vehicles is lost in case GPS is spoofed, satellites are blocked over short intervals, or GPS is restarted/updated. Here we present a synchronization-free version of RadChat (Sync-free RadChat), which relies on using the relative time for radar coordination, eliminating the dependency on the absolute time provided by GPS. Simulation results obtained for various use cases show that Sync-free RadChat is able to mitigate interference without degrading the radar performance.

Vehicular network


Radar communication

Radar interference


Radar communication convergence

FMCW radar

Radar communication coexistence


Canan Aydogdu

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Henk Wymeersch

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Olof Eriksson


Hans Herbertsson


Mats Rydström

Qamcom Research & Technology


20711050 (eISSN)

Vol. 13 12 6891

Combined Radar-Based Communication and Interference Mitigation for Automotive Applications

VINNOVA (2018-01929), 2019-01-01 -- 2020-12-31.

Subject Categories


Communication Systems

Vehicle Engineering



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7/5/2021 2