Frequency reuse in dual satellite settings: An initial evaluation of Full Duplex operation

Reuse of spectral resources is a way of pushing transmission rates beyond current limits. In the case of satellite communications, this is achieved in multibeam coverage and multiple polarization links, for example. In this paper, we make an initial evaluation of the reuse of the same time and frequency resources for both transmission and reception, in what is known as In-Band Full Duplex, and which is being considered as a promising technology for terrestrial wireless systems. The rate limits for the exchange of information between two ground antennas and two satellites are obtained as a function of the capability of suppressing the self-interference which is caused by the Full Duplex operation. Half Duplex single antenna rate is easily overcome in most cases, whereas Full Duplex performance is highly dependent on the self-interference cancellation, and MIMO operation has a high sensitivity on the antennas separation.