Photonics-aided integrated sensing and communication system in W-band using probabilistic shaping DMT waveform with full-frequency utilization

In this letter, we experimentally demonstrate a photonics-aided W-band integrated sensing and communication (ISAC) system by discrete multitone (DMT) signal. By employing an innovative truncated DMT waveform that enables full time-frequency resource sharing between communication and sensing functions, we overcome the spectral fragmentation limitations of conventional ISAC architectures. Co-optimizing signal truncation with probabilistic shaping (PS) 64-QAM modulation enhances communication performance while preserving full sensing bandwidth utilization. Experiments show that the system utilizes a low-cost envelope detector (ED) to achieve a transmission rate of 16.15 Gbit/s at a range of 50 m, while achieving a ranging resolution of 1.25 cm and triple-target imaging through pulse compression. This scheme significantly improves time-frequency resource utilization while maintaining hardware simplicity, providing a unified waveform solution for 6G millimeter-wave (mmWave) ISAC systems with high precision and low complexity.