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arXiv 1401.4936cs.ITmath.IT
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基于参数联合迭代优化的低复杂度鲁棒数据自适应模糊性约简

Low-Complexity Robust Data-Adaptive Dimensionality Reduction Based on Joint Iterative Optimization of Parameters

P. Li, R. C. de Lamare

摘要:

提出了一种基于改进的联合迭代优化(MJIO)算法的低复杂度鲁棒数据相关降维方法,用于降秩波束形成和导向矢量估计。所提出的鲁棒优化过程联合调整降秩矩阵和自适应波束形成器的参数。优化后的降阶矩阵将接收信号向量投影到维度较低的子空间上。然后在降维子空间中执行波束形成器/导向矢量优化。我们设计了有效的随机梯度和递归最小二乘算法来实现所提出的鲁棒MJIO设计。所提出的鲁棒MJIO波束形成算法具有更快的收敛速度和更好的性能。仿真结果表明,所提出的MJIO算法优于一些现有的满秩和降秩算法具有相当的复杂度。

英文摘要:

This paper presents a low-complexity robust data-dependent dimensionality reduction based on a modified joint iterative optimization (MJIO) algorithm for reduced-rank beamforming and steering vector estimation. The proposed robust optimization procedure jointly adjusts the parameters of a rank-reduction matrix and an adaptive beamformer. The optimized rank-reduction matrix projects the received signal vector onto a subspace with lower dimension. The beamformer/steering vector optimization is then performed in a reduced-dimension subspace. We devise efficient stochastic gradient and recursive least-squares algorithms for implementing the proposed robust MJIO design. The proposed robust MJIO beamforming algorithms result in a faster convergence speed and an improved performance. Simulation results show that the proposed MJIO algorithms outperform some existing full-rank and reduced-rank algorithms with a comparable complexity.

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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