6. Multiple Access Resource Allocation

The increasing traffic demand in both ground and satellite communication systems will lead to increasing spectrum demand. Spectrum sharing would become a challenging issue in future between terrestrial and satellite systems with frequency reusing, which would lead to co-channel interference. In this case, it is of great importance to allocate the system resources reasonably to optimize the system performance. Upon this, we propose two resource allocation schemes for two multiple access integrated system. First, we investigate the problem of interference controlling and power allocation in a terrestrial-satellite spectrum sharing network. In order to protect the terrestrial users, interference temperature limit is introduced for the satellite to control the interference caused to BS users. Then, under this constraint, we maximize the total capacity of the satellite system and obtain the optimal power allocation scheme. Second, we propose the concept of the Cloud Based Integrated Terrestrial-Satellite Network (CTSN), where both base stations of the cellular networks and the satellite are connected to a cloud central unit and the signal processing procedures are executed centrally at the cloud. By utilizing the channel state information (CSI), the interference from the mixed signal can be mitigated. When it comes to the case of imperfect CSI, we propose a resource allocation scheme in respect to subchannel and power to maximize the total capacity of the terrestrial system.