Joint Subcarrier and Power Allocation Design Based on Radar SNR Ratio in Integrated Radar and Communication System.

In this paper, the joint subcarrier and power allocation design for the radar-centric integrated radar and communication system are carried out with maximizing radar SNR ratio as the research goal while the communication rate and subcarrier power are taken as the constraints, and a bivariate model including subcarrier selection factor and single power allocation is established. The NP-hard problem in the model is solved by convex relaxation with a penalty term, after which the first-order Taylor expansion is considered to be introduced into the Lagrange multiplier method to solve the non-convex optimization problem by using KKT conditions to obtain the closed expressions for the subcarrier and power variables. Then we use the bisection method and cyclic optimization algorithm to obtain the optimal subcarrier and power allocation scheme under the different total number of carriers and communication rate thresholds. Finally, the effectiveness and reliability of the proposed joint allocation scheme in improving radar performance are verified by numerical simulation experiments.