Pulse Sequence Sensing and Pulse Position Modulation for Optical Integrated Sensing and Communication

The future wireless network is expected to provide communication and sensing abilities simultaneously, and the optical spectrum brings a promising candidate for integrated sensing and communication. In this letter, an integrated sensing and communication scheme based on pulse sequence sensing and pulse position modulation is proposed for free space optics. By generating a unipolar optical signal, optical wireless communication and optical sensing can adopt the intensity modulation and direct detection scheme simultaneously. Benefited from the nearly-ideal correlation properties of the pulse sequence, the communication receiver can detect the pulse position, and the sensing receiver can estimate the target distance. Moreover, different performance metrics of communication and sensing are derived theoretically. Simulations show that the proposed method can carry out communication and sensing simultaneously, even in the multi-user scenario. Furthermore, different optical systems can adjust system parameters to adapt to different scenarios, so that they will enhance the ability of the future wireless network.