**6. Conclusions**

We demonstrated a W-band simultaneous communication and sensing system operating at 97 GHz using a common 16-QAM OFDM waveform. The zero-delay-shift-based approach is proposed to overcome the sensing range limitation in the conventional OFDMbased sensing systems and enable range extension for the OFDM-based converged system. Both simulation and experimental measurements are performed in the W-band with a bandwidth of 3.9 GHz. Due to the large bandwidth available in the W-band, we achieve a sensing resolution of 0.042 m in range and 0.79 m/s in speed in the experiment. The target range well beyond the CPI is detected by using our proposed method. Furthermore, we also measure the 16-QAM OFDM communication performance, and the BER below the SD-FEC is achieved. The successful demonstration of the convergence of communication and sensing using the same waveform is a significant step towards future wireless applications.

**Author Contributions:** Conceptualization, N.M.I. and X.Y.; software, N.M.I., S.W. and L.Z.; data curation, N.M.I.; validation, N.M.I., Z.L., M.S. and H.Z.; investigation, N.M.I.; resources, X.Y.; writing original draft preparation, N.M.I.; writing—review and editing, N.M.I. and X.Y.; visualization, N.M.I.; supervision, X.Y.; project administration, X.Y.; funding acquisition, X.Y. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was funded by the National Key Research and Development Program of China under Grant 2018YFB1801500, the Natural National Science Foundation of China under Grant 62101483, the Natural Science Foundation of Zhejiang Province under Grant LQ21F010015, and the Zhejiang Lab under Grant 2020LC0AD01.

**Conflicts of Interest:** The authors declare no conflict of interest.
