Reliable and Energy-Efficient LEO Satellite Communication with IR-HARQ via Power Allocation

Reliable and Energy-Efficient LEO Satellite Communication with IR-HARQ via Power Allocation

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This paper mercury metallic lexus examines reliable and energy-efficient transmission in low earth orbit (LEO) satellite communication systems.In particular, we analyze the link transmission characteristics of the LEO satellite to the ground user and model the channel as a combination of large-scale fading and small-scale fading.Based on this, we consider an incremental redundancy hybrid automatic repeat request (IR-HARQ) technique with a variable-power allocation method, and we call it the IR-HARQ-VPA scheme.In this method, the outage probability after each IR-HARQ round can be obtained through numerical integration based on the fast Fourier transform (NI-FFT).This method is suitable for any number of HARQ transmission rounds and can improve the accuracy compared with previous approximation methods.

In addition, variable-power allocation based on the genetic algorithm (VPA-GA) is introduced to reduce the energy consumption.The simulation results show that the proposed IR-HARQ-VPA yazhi design saree scheme cannot only meet the requirements of transmission reliability but also achieves higher energy efficiency than IR-HARQ with equal power (IR-HARQ-EP) transmission and a previously proposed variable-power allocation method.Moreover, the simulation results in a LEO satellite communication window also confirm the effectiveness of the proposed IR-HARQ-VPA scheme.