Relay System And Multi-node Cooperative Sensing And Technology Based On Integrated Sensing And Communication

In the next-generation network,the cooperative network of integrated sensing and communication(CN-ISAC)will change the traditional mobile communication network architecture and design approach by integrating sensing-transmission-computing-usage,which can be widely used in industrial internet,vehicular network,UAV ad-hoc network or internet of everything composed of various nodes.The integrated sensing and communication can aggregate communication and radar bands,enabling both functions to be implemented on the same device at minimal cost.With the addition of multi-node collaboration,it is possible to break the limits of sensing and communication performance of a single point to achieve group sensing and information interaction.However,there is a paucity of research on the promising networks,such as multi-node collaborative sensing techniques based on ISAC.Traditional multi-node collaborative sensing techniques have been proposed for transmitter localization,target localization,and target ranging and velocimetry using multiple radar systems.Moreover,the ISAC nodes have not been studied as relays for CN-ISAC cooperative communication.This paper proposes two main problems and corresponding solutions based on current research.the main work is as follows.1.For the collaborative sensing,a multi-node passive collaborative sensing technique based on ISAC is proposed,which contains two datalevel fusion schemes and one signal-level fusion scheme.The distinction between the two data-level fusion methods is based on the existence of LOS(line-of-sight)path between the transmitting node and the receiving node,which can greatly alleviate the blurring effect on the detection results due to the asynchronous transceiver.The signal-level fusion scheme further improves the performance of collaborative sensing based on the data-level fusion scheme.2.Aiming at the problem of cooperative sensing,a multi-node passive cooperative velocity measurement and low-complexity two-dimensional arrival and departure angle estimation technology based on the integration of sensing and communication is proposed.The proposed angle estimation technique is divided into two stages:rough estimation and accurate estimation.For the multi-node model,a passive speed measurement algorithm is proposed.Due to the algorithm,a data-level fusion and signallevel fusion scheme is proposed.Compared with the data-level fusion scheme,the signal-level fusion scheme can effectively improve the speed measurement accuracy.3.For the collaborative communication problem,a scheme is proposed to enhance the communication capacity,using the ISAC nodes as relays.beamforming algorithms are designed for the ISAC cooperative communication scenario,and the interaction and influence of cooperative communication performance and sensory performance are explored while using difference between peak and sidelobe(DPSL)as an index to measure the sensing performance.The cooperative communication and sensing technologies proposed in this paper have high application value,which provides the foundation and support for the development of CN-ISAC.