A method for initializing free parameters in lattice structure of linear phase perfect reconstruction filter bank
A method for initializing free parameters in lattice structure of linear phase perfect reconstruction filter bank
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DOI：
10.1016/j.sigpro.2013.11.016
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
Bodong Li;Xieping Gao
中科院分区：
文献类型：
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作者：
Bodong Li;Xieping Gao
由于线性相位完全重构滤波器组（LPPRFB）的格型结构中的自由参数的优化通常是高度非线性的，因此在开始优化之前自由参数的初始化是重要的。本文系统地研究了自由参数的初始化问题，即用低阶自由参数代替高阶自由参数的方法。该方法分两步进行：制定之间的关系高阶和低阶LPPRFBs的多相矩阵，然后实施的基础上的关系的初始化。设计实例表明，与已发表的LPPRFB相比，我们的方法产生的滤波器组显示出相当或更好的性能。
Since the optimization of the free parameters in the lattice structure of linear phase perfect reconstruction filter bank (LPPRFB) is commonly highly nonlinear, the initialization of the free parameters is important before starting the optimization. We systematically study the initialization of the free parameters, following the way that initializes the free parameters in a higher-order LPPRFB by those in a lower-order one. The proposed method is carried out in two steps: formulating the relation between the higher-order and the lower-order LPPRFBs in terms of polyphase matrices, and then implementing the initialization based on the relation. Design examples show that, compared with published LPPRFBs, the filter banks yielded by our method show comparable or even better performance.