Ergodic Capacity of Multiuser Hybrid Satellite-Terrestrial Cooperative Networks with SNR-Threshold Based Feedback

Abstract

In this paper, we investigate the performance of a multiuser hybrid satellite-terrestrial cooperative network (HSTCN) with amplify-and-forward protocol. Different from the existing works, we propose an opportunistic user scheduling (OUS) scheme based on SNR-threshold feedback. By assuming that the satellite link and the terrestrial links undergo Shadowing-Rician fading and Rayleigh fading, respectively, we first obtain probability density function of the output signal-to-noise ratio (SNR) with the proposed scheduling scheme. Then, we derive analytical expression for the ergodic capacity (EC) of the considered system. Finally, numerical results prove that the OUS scheme with SNR-threshold based feedback can reduce the amount of feedback greatly, and the system with proposed scheme can achieve the same capacity as that without feedback threshold.