Orbit-Spectrum Sharing between the Fixed-Satellite and Broadcasting-Satellite Services with Applications to 12 GHz Domestic Systems
Identifies and evaluates strategies for sharing the geostationary orbit in the band 11.7 and 12.2 GHz between domestic systems in the fixed-satellite and broadcasting-satellite services. The effectiveness of two distinct types of sharing strategies, referred to as spectrum division and orbit division, is determined for various deployments of selected baseline systems representing the two services and for various combinations of sharing tactics such as frequency interleaving, crossed-polarization operation, and crossed-beam operation. Effectiveness is measured by the "utilization factor," defined as the number of channels provided by the baseline systems when using an assigned share of the orbit-spectrum resource, relative to what they could provide if given the entire resource. Computer simulation is used to verify the intra- and interservice interference compatibility of the assumed deployments. It is concluded that total utilization factors close to 100 percent can be achieved with both spectrum-division and properly chosen orbit-division strategies. Orbit-division strategies are to be preferred however because they permit a given total channel capacity to be achieved with fewer satellites and, for certain combinations of baseline systems, they yield a total utilization factor exceeding 100 percent.