【摘要】 随着6G通信研究的深入，卫星互联网作为空天地一体化网络的重要组成部分，对高吞吐量、高可靠性和低延时的需求推动了新型编码调制技术的发展。多级编码调制与混合自动重传请求技术的结合被认为是提升6G卫星互联网性能的重要方向。提出了一种基于多级编码调制的增量冗余重传方案，旨在优化频谱效率并增强传输可靠性。针对传统研究中多级编码调制与增量冗余重传独立设计的局限性，通过灵活的分层重传策略，使各编码层均能有效应用增量冗余重传，充分利用编码增益、分集增益和能量增益。仿真结果表明，在256QAM(Quadrature Amplitude Modulation)调制下，该方案在码率0.667时可实现约6～8 d B的性能增益，显著提升系统可靠性与重传性能。更多还原

【Abstract】 With the deepening of 6G communication research, satellite Internet, as an important part of the integrated space-air-ground network, has driven the development of new coding and modulation technologies for high throughput, high reliability and low latency. The combination of multi-level coded modulation and hybrid automatic repeat request(HARQ) technology is considered to be an important direction to improve the performance of 6G satellite Internet. This paper proposes an incremental redundancy retransmission scheme based on multi-level coded modulation, aiming to optimize spectrum efficiency and enhance transmission reliability. To address the limitations of the independent design of multi-level coded modulation and incremental redundancy retransmission in traditional research, the proposed scheme uses a flexible layered retransmission strategy to enable each coding layer to effectively apply incremental redundancy retransmission and make full use of coding gain, diversity gain and energy gain. Simulation results show that under 256 quadrature amplitude modulation(QAM), the scheme can achieve a performance gain of about 6-8 d B at a code rate of 0.667, significantly improving system reliability and retransmission performance.更多还原