Energy-efficient transmissions in integrated HAP/satellite networks for emergency communications

In this paper, a novel integrated high altitude platform/satellite (IHS) network system model for energy-efficient transmissions is proposed. In a slow flat Rician fading channel, the concept of link-state advertisement (LSA) is investigated, which estimates the channel state information by broadcasting LSAs at the HAP end and the satellite end rather than sensing at the terminal end, and which can significantly reduce the energy consumption of the terminal end. In addition, the energy consumption is modeled and the adaptive algorithm for the energy-efficient path selection is given. The simulation results validate the proposed adaptive algorithm. It is shown that the proposed adaptive algorithm can significantly improve the energy-efficient performance.

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