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首页> 外文期刊>Circuits, systems, and signal processing >A Low-Complexity Uniform and Non-uniform Digital Filter Bank Based on an Improved Coefficient Decimation Method for Multi-standard Communication Channelizers
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A Low-Complexity Uniform and Non-uniform Digital Filter Bank Based on an Improved Coefficient Decimation Method for Multi-standard Communication Channelizers

机译:基于改进系数抽取方法的多标准通信信道器的低复杂度统一非均匀数字滤波器组

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摘要

It has been shown in literature that the coefficient decimation (CD) techniques can be efficiently used to realize low-complexity finite impulse response (FIR) filters with flexible frequency responses. In this paper, we propose a novel filter bank (FB) design technique based on the combination of the conventional coefficient decimation method (CDM) and the modified coefficient decimation method recently proposed by us. In the proposed FB, subbands of desired bandwidths are obtained by the spectral subtraction of the lowpass and highpass frequency responses obtained after performing CD operations on the prototype filter, using appropriate decimation factors. The proposed FB that provides uniform as well as non-uniform subbands can be used for multi-standard channelization in wireless communication receivers. We show that the proposed FB has a significantly lower complexity along with superior stopband and transition band characteristics when compared with the conventional CDM-based progressive decimation filter bank (PDFB). The design example shows that the proposed FB offers 74 % reduction in multiplication complexity over the PDFB, when used for non-uniform multi-standard channelization with a fixed frequency channel distribution. If the same FB is used for multi-standard channelization with variable locations of the frequency channels, a substantial 95.67 % reduction in multiplication complexity is achieved over the PDFB.
机译:在文献中已经表明,系数抽取(CD)技术可以有效地用于实现具有灵活频率响应的低复杂度有限冲激响应(FIR)滤波器。在本文中,我们结合了我们最近提出的常规系数抽取方法(CDM)和改进的系数抽取方法,提出了一种新颖的滤波器组(FB)设计技术。在建议的FB中,使用适当的抽取因子,通过对原型滤波器执行CD操作之后获得的低通和高通频率响应的频谱相减,可以得到所需带宽的子带。提供统一和非统一子带的建议FB可用于无线通信接收机中的多标准信道化。我们表明,与传统的基于CDM的渐进式抽取滤波器组(PDFB)相比,提出的FB具有明显更低的复杂度以及出色的阻带和过渡带特性。设计示例表明,当用于具有固定频率信道分布的非均匀多标准信道化时,与PDFB相比,所提出的FB可将乘法复杂度降低74%。如果将相同的FB用于具有可变频道位置的多标准信道化,则与PDFB相比,乘法复杂度将降低95.67%。

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