The invention provides an energy efficiency
power model-based RIS-assisted ISAC joint beam forming method and
system. The method comprises the following steps: S1, a
base station sends a
signal to a reconfigurable intelligent surface RIS and a user k; s2, calculating a receiving
signal and an equivalent channel according to the transmitting
signal in the S1, obtaining an SINR of the kth user, modeling a
power model, determining
spectral efficiency (SE) and energy efficiency (EE), and calculating the minimum transmitting power; s3, on the basis of an alternating optimization framework, power distribution optimization is executed on the basis of the minimum transmitting power obtained in the S2; s4, fixing the power
distribution matrix obtained in the S3, and executing RIS
phase offset matrix optimization; and S5, judging whether the
algorithm converges or not, otherwise, executing S3 again, and calculating the SE and the energy efficiency EE of the current iteration. And S6, outputting the maximum energy efficiency value and the corresponding beam forming matrix and RIS
phase offset matrix. According to the method, the energy efficiency of the RIS-assisted ISAC
system can be accurately optimized, the
communication quality and the environment
perception capability are dynamically balanced, and the calculation complexity of non-convex constraint
processing is reduced.