Dual Quadrature Phase Reflection Modulation for RIS-Assisted Integrated Sensing and Communication

The development of digital society generates mass data coming from a huge number of sensors, arising the demand for high spectrum efficiency and energy efficiency related technologies. With passive reflection, the integrated sensing and communication (ISAC) can modulate the sensor information into the communication information and decode them in a cooperative manner at the integrated receiver, offering the potential for spectrum efficiency and energy efficiency enhancement. However, the power of sensor information is much lower than that of communication information, resulting in the bit rate downgrading or bit error rate (BER) increasing. In this paper, we develop the dual quadrature phase reflection modulation (DQP-RM) scheme along with its transmission framework to not only increase the sensor information symbol rate, but also decrease the BER of ISAC. Simulation results verify that DQP-RM theme can decrease the BER of sensor information compared with existing schemes and keep the BER of communication information unchanged while making the symbol rate of sensor information reach that of communication information.