App. Res. of Comp. Accepted Paper
Vol. 43, 2026 No. 12

Two-stage channel estimation for isac millimeter-wave uplink with imperfect prior information

Liu Yi
Deng Bingguang
Li Chao
School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
DOI: 10.19734/j.issn.1001-3695.2026.05.0122

Abstract

To address geometric prior mismatch caused by sensing errors and the high computational complexity of existing algorithms in radar-aided millimeter-wave multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) uplink systems, this study proposed a two-stage sparse channel estimation scheme. In the first stage, a robust adaptive-order simultaneous weighted orthogonal matching pursuit algorithm exploited coarse radar angle priors to construct local high-resolution angle dictionaries. It combined a robust multi-pilot correlation metric with residual-ratio-based adaptive order determination and employed a single-atom replacement search to accurately extract effective paths, especially weak paths. In the second stage, a generalized mean-field relevance vector machine performed structured sparse Bayesian estimation. Under the constraints of refined angular supports and coarse radar delay priors, it organized local delay atoms according to candidate angles and reduced the complexity of Bayesian inference through structured posterior approximation and atom-wise sparse shrinkage. Simulation results show that, under 3GPP comb-type pilot patterns with limited pilot resources, the proposed scheme achieves an approximately 2 dB performance gain over the benchmark algorithms and reduces the runtime of the second stage by approximately 1.5 orders of magnitude.

Foundation Support

重庆市自然科学基金创新发展联合基金(中国星网)资助项目(CSTB2023NSCQ-LZX0114)

Publish Information

DOI: 10.19734/j.issn.1001-3695.2026.05.0122
Publish at: Application Research of Computers Accepted Paper, Vol. 43, 2026 No. 12

Publish History

[2026-08-21] Accepted Paper

Cite This Article

刘奕, 邓炳光, 李超. 基于不完美先验的ISAC毫米波上行链路两阶段信道估计 [J]. 计算机应用研究, 2026, 43 (12). (2026-08-25). https://doi.org/10.19734/j.issn.1001-3695.2026.05.0122. (Liu Yi, Deng Bingguang, Li Chao. Two-stage channel estimation for isac millimeter-wave uplink with imperfect prior information [J]. Application Research of Computers, 2026, 43 (12). (2026-08-25). https://doi.org/10.19734/j.issn.1001-3695.2026.05.0122. )

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  • Application Research of Computers Monthly Journal
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    CN  51-1196/TP

Application Research of Computers, founded in 1984, is an academic journal of computing technology sponsored by Sichuan Institute of Computer Sciences under the Science and Technology Department of Sichuan Province.

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