From special analogous crystal filters to digital impacting filters
From special analogous crystal filters to digital impacting filters
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DOI：
10.1016/j.dsp.2012.02.011
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发表时间：
2012-07-01
影响因子：
2.9
通讯作者：
Gao, Peng
中科院分区：
文献类型：
--
作者：
Feng, Man;Wu, Lenan;Gao, Peng
高速高效无线通信（即超窄带（UNB）调制）的实现取决于一种特殊数字滤波器的设计，该滤波器不仅需要保持甚至放大调制波形中的微小差异，还需要削弱噪声或干扰。本文提出了一种新颖而简单的数字冲击滤波器，它是利用零群延迟晶体滤波器的原理制成的。所提出的滤波器可与超窄带调制中常见的小角度调制配合使用，特别是与扩展二进制相移键控（EBPSK）调制配合，它能够将噪声中的信号特性在相位跳变点转换为高幅度冲击，从而使超窄带信号易于检测。计算机仿真说明了所提出滤波器的有效性。© 2012爱思唯尔公司。保留所有权利。
The implementation of high-speed and high-efficiency wireless communications, or Ultra Narrow Band (UNB) modulation, depends on the design of a special digital filter, which needs to not only maintain or even enlarge the minute differences in modulated waveforms, but also weaken noise or interference. This paper proposes a novel but simple digital impacting filter produced by exploiting the mechanism of zero group delay crystal filters. The proposed filter can cooperate with the usual small-angle modulation of UNB modulation, especially with Extended Binary Phase Shift Keying (EBPSK) modulation, which can convert the signal characteristics in noise into high-amplitude impacting at the phase jump points, such that the UNB signal is easy to detect. A computer simulation illustrates the validity of the proposed filter. (C) 2012 Elsevier Inc. All rights reserved.