The idea of integrated sensing and communications is pretty simple [1–4]. A transmitter modulates its communication messages to electromagnetic (EM) wave, and emits the wave from its antenna. The EM wave reaches the communication receiver, and unloads the communication messages. Meanwhile, the EM wave is impacted (e.g., scattered or dispersed) by the environment. Sensing receivers (which could be the communication transmitter, communication receiver, or other receivers) pick up the EM wave and infer the environmental information from it. Therefore, in a single round of EM wave emission, both tasks of communications and radar sensing are accomplished.