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Reconfigurable Filter Bank With Complete Control Over Subband Bandwidths for Multistandard Wireless Communication Receivers

机译:可重新配置的滤波器组,可完全控制多标准无线通信接收器的子带带宽

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摘要

This paper presents a design of linear-phase, low-complexity, reconfigurable digital filter bank that offers independent and complete control over the bandwidth as well as the center frequency of all subbands. The proposed filter bank is designed by integrating spectral parameter approximation (SPA) technique with the modified coefficient decimation method (MCDM), referred to as SPA-MCDM-FB. The architectural details, design examples and complexity comparisons show that the SPA-MCDM-FB is easy to design and offers substantial savings in gate count, number of variable multipliers and group delay over other filter banks. Moreover, these savings increase further with the increase in the filter-bank resolution (i.e., number of subbands). The SPA-MCDM-FB is then combined with the upper confidence bound (UCB)-based decision-making algorithm to search the vacant band(s) of any desired bandwidth for spectrum-sensing application in cognitive radio (CR). The simulations results verify that the proposed scheme offers superior performance [i.e., improved utilization of vacant subband(s)] and needs fewer gate counts compared to uniform filter bank and UCB-algorithm-based schemes. Furthermore, the functionality and advantages of the SPA-MCDM-FB are also verified for the channelization operation in CR supporting multiple communication standards.
机译:本文提出了一种线性相位,低复杂度,可重新配置的数字滤波器组的设计,该滤波器组对带宽以及所有子带的中心频率提供了独立而完整的控制。拟议的滤波器组是通过将频谱参数逼近(SPA)技术与改进的系数抽取方法(MCDM)(称为SPA-MCDM-FB)集成而设计的。架构细节,设计实例和复杂性比较表明,SPA-MCDM-FB易于设计,与其他滤波器组相比,可大大节省门数量,变量乘法器数量和组延迟。此外,随着滤波器组分辨率(即,子带的数量)的增加,这些节省进一步增加。然后,将SPA-MCDM-FB与基于上限置信度(UCB)的决策算法相结合,以搜索任何所需带宽的空闲频带,以便在认知无线电(CR)中进行频谱检测。仿真结果证明,与统一的滤波器组和基于UCB算法的方案相比,该方案提供了卓越的性能[即,改进了对空闲子带的利用],并且需要的门数更少。此外,还针对支持多种通信标准的CR中的信道化操作验证了SPA-MCDM-FB的功能和优势。

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