Abstract : This paper proposes two interference mitigation methods to evaluate the feasibility of coexistence between existing radar altimeter services and emerging 5G as well as potentially 6G cellular services in the C-band. Monte Carlo simulations are performed to evaluate the cumulative interference power from ground base stations on radar altimeters. Our results demonstrate that the antenna height protection scheme can help achieve coexistence only when the ground base station is equipped with a 4-by-4 antenna array in rural environments and 4-by-4 and 8-by-8 antenna arrays in suburban environments. Nevertheless, this scheme is effective for all antenna configurations in urban environments. Specifically, when using the angular protection method, ground base stations with 4-by-4, 8-by-8, or 16-by-16 antenna arrays can coexist with radar altimeters.
Index terms : Coexistence, radar altimeter, protection, radio interference