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...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。展开更多
An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ sch...An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ scheme is well formulated and efficiently solved by a linear-programming method, along with a one-dimensional approach for density evolution. Compared to IR-HARQ schemes based on turbo codes, simulation shows that the proposed IR-HARQ schemes based on IRA codes may achieve almost the same performance at a block size of 1 024, but better throughput at a block size of 4 096. The advantages of the proposed scheme in implementation, including decoding complexity and parallelism, make it more attractive in practice than the IR-HARQ schemes based on both turbo and LDPC codes.展开更多
文摘随着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。
基金The National High Technology Research and Develop-ment Program of China(863Program)(No.2006AA01Z263)the National Natural Science Foundation of China(No.60672081)+1 种基金the Natural Science Foundation of Jiangsu Province(No.BK2006502)the Open Research Fund of National Mobile Communications Research Laboratory of Southeast Uni-versity(No.2008N01)
文摘An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ scheme is well formulated and efficiently solved by a linear-programming method, along with a one-dimensional approach for density evolution. Compared to IR-HARQ schemes based on turbo codes, simulation shows that the proposed IR-HARQ schemes based on IRA codes may achieve almost the same performance at a block size of 1 024, but better throughput at a block size of 4 096. The advantages of the proposed scheme in implementation, including decoding complexity and parallelism, make it more attractive in practice than the IR-HARQ schemes based on both turbo and LDPC codes.
