Orbit-Spectrum Sharing Between the Fixed-Satellite and Broadcasting-Satellite Services at 12 GHz

Identifies and evaluates strategies for sharing the geostationary orbit in the band 11.7 to 12.2 GHz between domestic systems in the fixed-satellite and broadcasting-satellite services. Effectiveness of two types of sharing strategies — 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, cross-polarization operation, and crossed-beam operation. Effectiveness is measured by the "utilization factor," i.e., 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. Conclusions are: Total utilization factors close to 100 percent can be achieved with both spectrum-division and properly chosen orbit-division strategies, but the latter are preferred 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.