A Spectrum-Sharing Multiple Terminals Transmission Method in VSAT Networks

Very small aperture terminal (VSAT) networks have been widely used for multiple terminals transmission in satellite communications. It enables the hub station and multiple terminals to transmit data interactively in a star topology. With the ever-growing demand of satellite communication services, the VSAT network could not provide enough spectral resources for huge number of terminals accessing in. In this paper, a spectrum-sharing transmission method is proposed to improve the network spectral efficiency. Recognizing the different transmission abilities of antennas equipped at the hub station and the terminals, we allocate the terminals inside the hub station frequency band without spending more spectral resources. The performance of the studied algorithm is further theoretically analyzed. Simulation results confirm the advantages of the spectrum-sharing strategy in terms of the ergodic sum rate.