低复杂度HBCEM FRM多相滤波器组

Low Complexity HBCEM FRM Polyphase Filter Bank

针对滤波器组的子信道过渡带过窄带来的高计算复杂度问题,首先分析了半带复指数调制FRM滤波器(HBCEM FRM,Half band complex exponential modulation frequency-response masking filter)实现高效性的根本原因,然后采用这种滤波器作原型滤波器并结合多相滤波的思想。针对复信号和实信号,分别提出了两种HBCEM FRM多相滤波器组。当滤波器组原型滤波器的过渡带要求较窄时,新滤波器组比传统的FRM滤波器组具有更低的计算复杂度。最后通过复杂度分析和应用实例证明了该方法的有效性。

Aimed at the problem of high computation complexity by the narrower of sub-channel transition,the essential reason of HBCEM FRM filter for high efficiency is analyzed.Then,combining with the thought of multiphase filtering,two HBCEM FRM uniformity filter banks are proposed by using HBCEM FRM filter as a prototype filter.The filter banks have lower computation complexity than conventional FRM filter bank when the transition bandwidth of the prototype filter is sharp.Finally,the complexity analysis and the design example are used to illustrate the feasibility.