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This paper investigates the problem of joint subcarrier and power allocationin the coexistence of radar and multi-user communication systems. Specifically,in our research scenario, the base station (BS) provides informationtransmission services for multiple users while ensuring that its interferenceto a separate radar system will not affect the radar's normal function. To thisend, we propose a subcarrier and power allocation scheme based on orthogonalfrequency division multiple access (OFDM). The original problem consistinginvolving multivariate fractional programming and binary variables is highlynon-convex. Due to its complexity, we relax the binary constraint byintroducing a penalty term, provided that the optimal solution is not affected.Then, by integrating multiple power variables into one matrix, the originalproblem is reformulated as a multi-ratio fractional programming (FP) problem,and finally a quadratic transform is employed to make the non-convex problem asequence of convex problems. The numerical results indicate the performancetrade-off between the multi-user communication system and the radar system, andnotably that the performance of the communication system is not improved withpower increase in the presence of radar interference beyond a certainthreshold. This provides a useful insight for the energy-efficient design ofthe system.

Efficient Spectrum Sharing Between Coexisting OFDM Radar and Downlink Multiuser Communication Systems