通信学报2025，Vol.46Issue(12)：69-79,11.DOI:10.11959/j.issn.1000-436x.2025253
基于叠加导频方案的AFDM稀疏信道估计与数据检测
Sparse channel estimation and data detection for AFDM with superimposed pilot scheme
摘要
Abstract
To address the problem of limited spectral efficiency caused by the guard interval in conventional embedded pilot(EMP)channel estimation schemes for affine frequency division multiplexing(AFDM),an iterative superimposed pilot(ISP)scheme was proposed.For AFDM systems,the time-domain channel matrix was a sparse banded matrix com-posed of multiple diagonals.Hence,channel estimation was formulated as a sparse signal recovery problem and used the orthogonal matching pursuit(OMP)algorithm to exploit the channel sparsity.For data detection,a low-complexity ex-pectation propagation(EP)algorithm was developed by utilizing the block quasi-banded structure of the channel matrix.The ISP framework alternated between sparse channel estimation and EP-based detection to iteratively refine perfor-mance.Simulation results show that the proposed ISP scheme significantly outperforms the EMP baseline.关键词
仿射频分复用/信道估计/叠加导频/期望传播Key words
AFDM/channel estimation/superimposed pilot/expectation propagation分类
信息技术与安全科学引用本文复制引用
曹喆,温淼文,黄煜,陈芳炯..基于叠加导频方案的AFDM稀疏信道估计与数据检测[J].通信学报,2025,46(12):69-79,11.基金项目
国家自然科学基金资助项目(No.62271208) （No.62271208）
广东基础和应用基础研究基金资助项目(No.2024A1515011107) （No.2024A1515011107）
广西重点研发计划基金资助项目(No.AB25069510)The National Natural Science Foundation of China(No.62271208),The Guangdong Basic and Applied Basic Research Foundation(No.2024A1515011107),The Guangxi Key Research and Development Program(No.AB25069510) （No.AB25069510）
