Complementary Coded Scrambling RadCom System-An Integrated Radar and Communication Design in Multi-User-Multi-Target Scenarios

Radar, serving as a sensing technology, is anticipated to be integrated into the sixth-generation (6G) mobile communication system to facilitate high-precision sensing functions, potentially inciting spectrum competition between radar and wireless communication systems. To address this challenge, this study explores a code domain method for mitigating mutual interference caused by spectrum sharing between communication and radar systems. Particularly, this work designs a three-dimensional complementary scrambling code together with the transceiver structure that can simultaneously support communication and radar in a multi-user-multi-target scenario. The complementary scrambling code exhibits ideal correlation properties in both synchronous and asynchronous channels, seamlessly incorporating the time-frequency-space domain. The proposed scheme, referred to as the complementary coded scrambling radar and communication (CCS-RadCom) system, exhibits considerably higher spectral efficiency than that of the spread spectrum-based system due to the fact that it employs scrambling modulation to achieve processing gain. Additionally, this study conducts a joint evaluation of data rates and radar estimate rates. Simulation results indicate that the proposed system successfully achieves improved performance in terms of radar estimation rate and data rate.