A Unified Waveform for Optical Wireless Integrated Sensing and Communication

The integrated sensing and communication with optical wireless (ISAC-OW) can effectively reduce the demand of spectrum and hardware while improving the sensing resolution and data rate. However, the key challenge is to design a fully unified waveform that enables both light detection and ranging (LiDAR) and communication. To this issue, an ISAC-OW unified waveform is proposed based on quadrature phase shift keying (QPSK) and direct sequence spread spectrum (DSSS). The key idea of the proposal is to load the modulated user data on the pseudorandom noise (PN) sequence by direct spread spectrum (DSS). Subsequently, the proposed ISAC-OW system is simulated and analyzed under Gamma-Gamma atmospheric turbulence channels. The results show that our proposal can not only guarantee the excellent ranging performance of LiDAR, but also realize high-speed and reliable data transmission.