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Reliable and Energy-Efficient LEO Satellite Communication with IR-HARQ via Power Allocation.
Hongxiu Bian1, Rongke Liu1,2
1School of Electronic and Information Engineering, Beihang University, Beijing 100191, China.
This study introduces an energy-efficient transmission scheme for Low Earth Orbit (LEO) satellite communications. The proposed Incremental Redundancy Hybrid Automatic Repeat Request with Variable Power Allocation (IR-HARQ-VPA) enhances reliability and reduces energy consumption.
Area of Science:
- Satellite Communications
- Wireless Transmission
- Information Theory
Background:
- Low Earth Orbit (LEO) satellite systems face challenges in reliable and energy-efficient data transmission.
- Channel modeling in LEO links involves complex large-scale and small-scale fading characteristics.
- Existing Hybrid Automatic Repeat Request (HARQ) schemes require optimization for power allocation and accuracy.
Purpose of the Study:
- To develop a novel transmission scheme for enhanced reliability and energy efficiency in LEO satellite communications.
- To accurately model and analyze the performance of LEO satellite links under fading conditions.
- To introduce an optimized power allocation strategy for IR-HARQ protocols.
Main Methods:
- Channel modeling incorporating large-scale and small-scale fading for LEO satellite links.
- Implementation of an Incremental Redundancy Hybrid Automatic Repeat Request (IR-HARQ) technique.
- Development of a Variable Power Allocation (VPA) strategy using a genetic algorithm (GA) for IR-HARQ (IR-HARQ-VPA).
- Numerical integration based on the Fast Fourier Transform (NI-FFT) for outage probability calculation.
Main Results:
- The proposed IR-HARQ-VPA scheme achieves high transmission reliability in LEO satellite systems.
- Significant improvements in energy efficiency compared to IR-HARQ with Equal Power (IR-HARQ-EP) and other VPA methods.
- Accurate outage probability analysis using NI-FFT, suitable for multiple HARQ rounds.
- Validation of the scheme's effectiveness within a LEO satellite communication window.
Conclusions:
- The IR-HARQ-VPA scheme offers a superior solution for reliable and energy-efficient LEO satellite communications.
- The genetic algorithm-based variable power allocation effectively minimizes energy consumption.
- Accurate performance evaluation methods are crucial for optimizing LEO satellite communication protocols.
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