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基于压缩感知的高分辨频率估计 被引量:16
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作者 刘兆霆 何劲 刘中 《信号处理》 CSCD 北大核心 2009年第8期1252-1256,共5页
压缩感知是信号离散表示的新理论。本文将该表示理论用于正弦信号的频率估计,提出一种新的高分辨率的频率估计方法。该方法根据信号的稀疏表示,利用一个随机的压缩矩阵先对信号进行压缩,再在压缩域中通过对l_1模优化重构该稀疏信号,获... 压缩感知是信号离散表示的新理论。本文将该表示理论用于正弦信号的频率估计,提出一种新的高分辨率的频率估计方法。该方法根据信号的稀疏表示,利用一个随机的压缩矩阵先对信号进行压缩,再在压缩域中通过对l_1模优化重构该稀疏信号,获得信号的频率估计。模拟分析了新方法性能,并与直接l_1模优化算法、Pisarenko、MUSIC等算法进行了比较。结果表明本文方法分辨性能明显优于Pisarenko和MUSIC等算法;具有直接l_1模优化算法相当的性能,但计算量大大降低。 展开更多
关键词 压缩感知 分辨率 二次锥规化 稀疏分解
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EXTENSION OF SMOOTHING NEWTON ALGORITHMS TO SOLVE LINEAR PROGRAMMING OVER SYMMETRIC CONES 被引量:3
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作者 Zhenghai HUANG Xiaohong LIU 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2011年第1期195-206,共12页
There recently has been much interest in studying some optimization problems over symmetric cones. This paper deals with linear programming over symmetric cones (SCLP). The objective here is to extend the Qi-Sun-Zho... There recently has been much interest in studying some optimization problems over symmetric cones. This paper deals with linear programming over symmetric cones (SCLP). The objective here is to extend the Qi-Sun-Zhou's smoothing Newton algorithm to solve SCLP, where characterization of symmetric cones using Jordan algebras forms the fundamental basis for our analysis. By using the theory of Euclidean Jordan algebras, the authors show that the algorithm is globally and locally quadratically convergent under suitable assumptions. The preliminary numerical results for solving the second-order cone programming are also reported. 展开更多
关键词 Euclidean Jordan algebra linear programming smoothing algorithm symmetric cone.
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