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arXiv 2408.12239eess.SP
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大规模MIMO-OTFS信道估计的快速突发稀疏学习算法

Fast Burst-Sparsity Learning Approach for Massive MIMO-OTFS Channel Estimation

Ming Ma, Jisheng Dai, Xue-Qin Jiang

AI总结:

本文提出一种基于混合突发稀疏先验和独立变分贝叶斯推断的快速算法,用于大规模MIMO-OTFS信道估计,并加入角度/多普勒细化以缓解离网失配,提升性能并降低复杂度。

摘要:

在大规模多输入多输出(MIMO)配置的正交时频空间(OTFS)系统中,由于高维稀疏表示(SR),精确的信道估计具有挑战性。现有方法常面临性能下降和/或高计算复杂度的问题。为解决这些问题并利用复杂的信道稀疏结构,本文首先采用一种新颖的混合突发稀疏先验来捕获角度/延迟域中的突发/公共稀疏结构,然后利用独立的变分贝叶斯推断(VBI)分解技术高效求解高维SR问题。此外,所提方法中融入了角度/多普勒细化方法,以自动减轻离网失配的影响。

英文摘要:

Accurate channel estimation in orthogonal time frequency space (OTFS) systems with massive multiple-input multiple-output (MIMO) configurations is challenging due to high-dimensional sparse representation (SR). Existing methods often face performance degradation and/or high computational complexity. To address these issues and exploit intricate channel sparsity structure, this letter first leverages a novel hybrid burst-sparsity prior to capture the burst/common sparse structure in the angle/delay domain, and then utilizes an independent variational Bayesian inference (VBI) factorization technique to efficiently solve the high-dimensional SR problem. Additionally, an angle/Doppler refinement approach is incorporated into the proposed method to automatically mitigate off-grid mismatches.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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