Rydberg communication antennas with self-decoupling for dynamic radar interference based on heterodyne technology

The Rydberg atomic communication antenna exhibits exceptional properties superior to traditional antennas. The use of heterodyne technology further establishes a foundation for high-precision digital communication. However, current signal solvers limit its application in integrated radar-communication systems. To address this, we propose a multi-parameter mapping model between Rydberg heterodyne communication symbols and the receiver signals under radar interference. Based on this model, we introduce an adaptive signal-to-interference ratio (SIR)-based hybrid (ASIRH) solver for adaptive decoupling in the presence of wide power range radar interference, using the established Rydberg heterodyne small-sample dataset to update the solver parameters. We employ a Cs Rydberg atomic receiver to implement a single-channel 4-state frequency-shift keying digital communication protocol. The ASIRH model's solving capability is validated within the SIR range of −20 to 28 dB, demonstrating performance with an symbol error rate of less than 3.97% under communication conditions with a data rate of 80 kSym/s and a carrier amplitude of 50μV/cm. This work paves the way for the application of Rydberg communication in complex electromagnetic environments with time-varying radar interference.