Low-Complexity Reconfigurable Fast Filter Bank for Multi-Standard Wireless Receivers
Low-Complexity Reconfigurable Fast Filter Bank for Multi-Standard Wireless Receivers
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DOI：
10.1109/tvlsi.2013.2263813
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发表时间：
2014-05
影响因子：
2.8
通讯作者：
S. Darak;S. Gopi;V. A. Prasad;E. Lai
中科院分区：
文献类型：
--
作者：
S. Darak;S. Gopi;V. A. Prasad;E. Lai
本文介绍了一种新的低复杂度可重构快速滤波器组（RFFB），用于频谱传感和信道化等无线通信应用。在RFFB中，子带的带宽和中心频率可以随高频率分辨率而变化，而无需硬件重新实现。这是在提出的多阶段实现的第一阶段使用改进的基于变频的可变数字滤波器（MFT-VDF）实现的。现有基于二阶变换的低通变频器的截止频率范围有限，约为采样频率的12.5%。所提出的低通MFT-VDF在较宽的频率范围内提供对截止频率的完整控制，从而改善了现有vdf的截止频率范围。设计实例表明，RFFB易于设计，并且比其他滤波器组节省了大量的门数。
This brief presents a new low-complexity reconfigurable fast filter bank (RFFB) for wireless communication applications such as spectrum sensing and channelization. In RFFB, the bandwidth and center frequency of sub-bands can be varied with high frequency resolution without hardware reimplementation. This is achieved with an improved modified frequency transformation-based variable digital filter (MFT-VDF) at the first stage of the proposed multistage implementation. Existing second-order frequency transformation-based low-pass VDFs have limited cutoff frequency range which is approximately 12.5% of the sampling frequency. The proposed low-pass MFT-VDF offers unabridged control over the cutoff frequency on a wide frequency range thereby, improving the cutoff frequency range of existing VDFs. The design example shows that the RFFB is easy to design and offers substantial savings in gate counts over other filter banks.